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756 lines
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HTML
756 lines
38 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Strict//EN">
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<html><head><meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"><meta http-equiv="Content-Language" content="en-us"><title>Product</title><link rel="stylesheet" type="text/css" href="../style.css"></head>
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<body style="background-color: rgb(255, 255, 255);">
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<h3>eLua Modules Reference Manual
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</h3>
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<h2><a name="genericmodules"></a>eLua Generic
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Modules</h2>A Generic eLua Module is a module that can be used equally by a Lua program running on any of the <a href="status.html#platforms">supported eLua platforms</a>.<br>Write your code once and it is already automatically ported to the main platforms of the embedded world.<br><br><h3><a name="bitmodule"></a>bit</h3>
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Bitwise operations in eLua is implemented thru
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the BitLib library, from Reuben Thomas.<br>
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BitLib project is hosted at LuaForge on
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<a href="http://luaforge.net/projects/bitlib" target="_top">http://luaforge.net/projects/bitlib</a><br>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_bnot"></a>Res = bit.bnot( value )</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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unary negation
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_band"></a> Res = bit.band( v1, v2, ... )</p>
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<p class="MsoNormal" style="font-family: Verdana;"><b>bitwise
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</b>"and"
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_bor"></a> Res = bit.bor( v1, v2, ... )</p>
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<p class="MsoNormal" style="font-family: Verdana;"><span style="font-weight: bold;"> </span><b class="info" style="font-weight: bold;">bitwise</b><b class="info" style="font-weight: bold;">
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</b><span class="info" style="font-weight: bold;">"or"</span>
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_bxor"></a> Res = bit.bxor( v1, v2, ... )</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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<b>bitwise</b><b> </b>"exclusive or"
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_lshift"></a> Res = bit.lshift( value, pos )</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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shift "value" left "pos" positions.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_rshift"></a> Res = bit.rshift( value, pos )</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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shift "value" right "pos" positions. The sign is not propagated.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_arshift"></a> Res = bit.arshift( value, pos )</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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shift "value" right "pos" positions. The sign is propagated
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("arithmetic shift").
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_bit"></a> Res = bit.bit( bitno )</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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a shortcut for bit.lshift( 1, bitno )
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_set"></a> Res1, Res2, ... = bit.set( bitno, v1,
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v2, ... )</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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set the bit at position "bitno" in v1, v2, ... to 1.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_clear"></a> Res1, Res2, ... = bit.clear( bitno,
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v1, v2, ... )</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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set the bit at position "bitno"in v1, v2, ... to 0.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_isset"></a> Res = bit.isset( value, bitno )</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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returns true if bit at position "bitno" in "value" is 1, false
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otherwise.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="bit_isclear"></a> Res = bit.isclear( value, bitno )</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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returns true if bit at position "bitno" in "value" is 0, false
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otherwise.
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</p>
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<br style="font-family: Verdana;">
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<br style="font-family: Verdana;">
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<br>
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<br>
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<br>
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<br>
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<br>
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<br>
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<br>
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<br>
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<h3><a name="cpumodule"></a>cpu</h3>
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<p class="MsoNormal" style="font-family: Verdana;"><br>
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</p>
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<p style="margin-bottom: 0in;"> </p>
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<font face="Bitstream Vera Sans Mono, sans-serif"><a name="cpu_write32"></a>write32( address, data ) : write
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the 32-bit data at the specified address</font>
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<p style="margin-bottom: 0in;"></p>
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<p style="margin-bottom: 0in;">
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="cpu_write16"></a>write16( address, data ) : write
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the 16-bit data at the specified address</font>
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</p>
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<p style="margin-bottom: 0in;">
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="cpu_write8"></a>write8( address, data ) : write the
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8-bit data at the specified address</font> <br>
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</p>
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<p style="margin-bottom: 0in;"><br>
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</p>
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<br>
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<font face="Bitstream Vera Sans Mono, sans-serif"><a name="cpu_read32"></a>Data = read32( address ) :
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reads 32-bit data from the specified address</font>
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<p style="margin-bottom: 0in;"></p>
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<p style="margin-bottom: 0in;">
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="cpu_read16"></a>Data = read16( address ) : reads
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16-bit data from the specified address</font>
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</p>
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<p style="margin-bottom: 0in;">
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="cpu_read8"></a>Data = read8( address ) : reads 8-bit
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data from the specified address</font></p>
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<p style="margin-bottom: 0in;"><br>
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</p>
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<br>
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<p style="margin-bottom: 0in;"><a name="cpu_disableinterrupts"></a>
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[cpu.disableinterrupts()] <font face="Bitstream Vera Sans Mono, sans-serif">cli(): disable
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CPU interrupts</font>
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</p>
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<p style="margin-bottom: 0in;"> <br>
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</p>
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<p style="margin-bottom: 0in;"> <br>
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</p>
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<p style="margin-bottom: 0in;"><a name="cpu_enableinterrupts"></a>
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[cpu.enableinterrupts()] <font face="Bitstream Vera Sans Mono, sans-serif">sei(): enable
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CPU interrupts</font>
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</p>
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<p style="margin-bottom: 0in;"> <br>
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</p>
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<p style="margin-bottom: 0in;">
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><br>
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</font></p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="cpu_clockfrequency"></a>[cpu.clockfrequency()]
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Clock = clock(): returns the CPU frequency</font>
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</p>
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<p style="margin-bottom: 0in;"> <br>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">Also, you can
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expose as many CPU constants (for example memory mapped registers)</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">as you want to
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this module. You might want to use this feature to access some </font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">CPU memory areas
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(as defined in the CPU header files from the CPU support </font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">package)
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directly from Lua. To do this, you'll need to define the </font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">PLATFORM_CPU_CONSTANTS
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macro in the platform's platform_conf.h file </font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">(src/platform/<platform
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name>/platform_conf.h). Include all your constants in a </font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">_C(
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<constant name> ) definition, and then build your project.</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">For example,
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let's suppose that your CPU's interrupt controler has 3 memory</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">mapped
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registers: INT_REG_ENABLE, INT_REG_DISABLE and INT_REG_MASK. If you want</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">to access them
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from Lua, locate the header that defines the values of these</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">registers (I'll
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assume its name is "cpu.h") and add these lines to the</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">platform_conf.h:</font>
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</p>
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<p style="margin-bottom: 0in;"> <br>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">#include "cpu.h"</font>
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</p>
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<p style="margin-bottom: 0in;"> <br>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">#define
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PLATFORM_CPU_CONSTANTS\</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">_C(
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INT_REG_ENABLE ),\</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">_C(
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INT_REG_DISABLE ),\</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">_C( INT_REG_MASK
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)</font>
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</p>
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<p style="margin-bottom: 0in;"> <br>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">After this
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you'll be able to access the regs directly from Lua, like this:</font>
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</p>
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<p style="margin-bottom: 0in;"> <br>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">data = cpu.r32(
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cpu.INT_REG_ENABLE )</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">cpu.w32(
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cpu.INT_REG_ENABLE, data )</font>
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</p>
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<p style="margin-bottom: 0in;"> <br>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">For a
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"real-life" example, see the src/platform/lm3s/platform_conf.h file.</font>
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</p>
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<p style="margin-bottom: 0in;">
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">[uart.sendstring]
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uart.sendstr( id, str1, str2, ... ): this is similar to "uart.send",
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but its parameters are string. </font>
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</p>
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<p style="margin-bottom: 0in;"> <br>
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</p>
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<p style="margin-bottom: 0in;"> </p>
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<h3><a name="gpiomodule">pio</a></h3>
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<p class="MsoNormal" style="font-family: Verdana;">
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<b>pio</b></p><p class="MsoNormal" style="font-family: Verdana;">Programable Input Output Module</p><p class="MsoNormal" style="font-family: Verdana;">Some notes on PIO:</p><ul><li>pio: only
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some platform have internal pullups for the pio pins, while Cortex is
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the only platform that also provides pulldowns for its pios. However,
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in this case you're safe, as eLua will signal an error if you try to
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execute a pullup operatin on a platform that does not support it.</li></ul><p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<br>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="gpio_setpinvalue"></a> [pio.setpinvalue] pio.setpin(
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value, Pin1, Pin2 ... ): set the value to all the pins in the list
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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to "value" (0 or 1).
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="gpio_setpinhigh"></a> [pio.setpinhigh] pio.set(
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Pin1, Pin2, ... ): set the value of all the pins in the list to 1.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="gpio_getpinvalue"></a> [pio.getpinvalue] Val1, Val2,
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... = pio.get( Pin1, Pin2, ... ): reads one or more pins and returns
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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their values (0 or 1).
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="gpio_setpinlow"></a> [pio.setpinlow] pio.clear(
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Pin1, Pin2, ... ): set the value of all the pins in the list to 0.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="gpio_configpin"></a> [pio.configpin(pio.DIR, pio.DIR_INPUT)] pio.input( Pin1, Pin2, ... ): set the specified pin(s)
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as input(s).
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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[pio.configpin(pio.DIR, pio.DIR_OUTPUT)] pio.output( Pin1, Pin2, ...
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): set the specified pin(s) as output(s).
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="gpio_setportvalue"></a> [pio.setportvalue]
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pio.setport( value, Port1, Port2, ... ): set the value of all the ports
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in the
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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list to "value".
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="gpio_getportvalue"></a> [pio.getportvalue] Val1,
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Val2, ... = pio.getport( Port1, Port2, ... ): reads one or more ports
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and
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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returns their values.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="gpio_getportname"></a> [pio.getportname]
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Port = pio.port( code ): return the physical port number associated
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with the given code. For example, "pio.port( pio.P0_20 )" will return
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0.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;"><a name="gpio_getpinnumber"></a> [pio.getpinnumber] Pin =
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pio.pin( code ): return the physical pin number associated with the
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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given code. For example, "pio.pin( pio.P0_20 )" will return 20.
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</p>
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<br>
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<a name="gpio_togglepin"></a>[pio.togglepin([Pin1],
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[Pin2], ...)]<br>
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<br>
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<a name="gpio_toogleport"></a>[pio.toggleport([Port1],
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[Port2], ...)]<br style="font-family: Verdana;">
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<br>
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Another idea (can be added to the above ?)<br>
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[pio.configport(pio.[FUNCTION], pio.MASK, [MASK])]<br>
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Ex:<br>
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pio.configpin(pio.DIR, pio.DIR_INPUT) (.DIR_OUTPUT)<br>
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pio.configpin(pio.PULL, pio.PULL_UP) (.PULL_DOWN,
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PULL_NO)<br style="font-family: Verdana;">
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<br>
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<p class="MsoNormal" style="font-family: Verdana;">
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[pio.configport(pio.DIR, pio.DIR_INPUT, [Port1], [Port2], ...)]
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pio.port_input( Port1, Port2, ... ): set the specified port(s) as
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input(s).
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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[pio.configport(pio.DIR, pio.DIR_OUTPUT, [Port1], [Port2], ...)]
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pio.port_output( Port1, Port2, ... ): set the specified port(s) as
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output(s).
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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[pio.configpin(pio.PULL, pio.PULL_UP, [Pin1], [Pin2], ...)]
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pio.pullup( Pin1, Pin2, ... ): enable internal pullups on the specified
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pins.Note that some CPUs might not provide this feature.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
|
|
|
|
</p>
|
|
<p class="MsoNormal" style="font-family: Verdana;">
|
|
[pio.configpin(pio.PULL, pio.PULL_DOWN, [Pin1], [Pin2], ...)]
|
|
pio.pulldown( Pin1, Pin2, ... ): enable internal pulldowns on the
|
|
specified pins. Note that some CPUs might not provide this feature.
|
|
</p>
|
|
<p class="MsoNormal" style="font-family: Verdana;">
|
|
|
|
</p>
|
|
<p class="MsoNormal" style="font-family: Verdana;">
|
|
[pio.configpin(pio.PULL, pio.PULL_NO, [Pin1], [Pin2], ...)]
|
|
pio.nopull( Pin1, Pin2, ... ): disable the pullups/pulldowns on the
|
|
specifiedpins. Note that some CPUs might not provide this feature.
|
|
</p>
|
|
<br>
|
|
<h3><a name="netmodule"></a>net</h3>
|
|
<br>
|
|
<h3><a name="pwmmodule"></a>pwm</h3>
|
|
<span style="font-weight: bold;"></span><br>
|
|
<p style="margin-bottom: 0in;"> <br>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">It allows Lua to
|
|
use the PWM blocks on the target CPU.</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <br>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><strike><a name="pwm_setup"></a>[pwm.setup]</strike>(</font><font face="Bitstream Vera Sans Mono, sans-serif">pwm.setup( id,
|
|
frequency, Active Cycle ) </font><font face="Bitstream Vera Sans Mono, sans-serif">
|
|
Data = pwm.setup( id, frequency, duty ): sets the PWM block 'id' to
|
|
generate the specified frequency with the specified duty cycle (duty is
|
|
an integer number from 0 to 100, specifying the duty cycle in
|
|
percents). It returns the actual frequency set on the PWM block.</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;">
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <br>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> Here there is a bigger
|
|
change on the proposal.
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> The Timer Clock and the
|
|
PWM "frame" frequency would be set up in the same function (.setup)
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> The normal control
|
|
function would only set the active cicle (.setcycle)
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> The original .setup
|
|
function would then be replaced by:
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <br>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">[pwm.setup( id,
|
|
tmrclock, pwm_frequency )</font> ]<br>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <a name="pwm_setcycle"></a>[pwm.setcycle(
|
|
id, active_cycle )]</p>
|
|
<p style="margin-bottom: 0in;"><font face="Bitstream Vera Sans Mono, sans-serif"><a name="pwm_start"></a>[pwm.start()]
|
|
pwm.start( id ): start the PWM block 'id'.</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;">
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="pwm_stop"></a>[</font><font face="Bitstream Vera Sans Mono, sans-serif">pwm.stop()]
|
|
</font><font face="Bitstream Vera Sans Mono, sans-serif">pwm.stop(
|
|
id ): stop the PWM block 'id'.</font>
|
|
</p>
|
|
<br>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="pwm_setclock"></a>Data = pwm.setclock( id, clock ):
|
|
set the base clock of the PWM block 'id' to</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">the given clock.
|
|
In returns the actual clock set on the PWM block.</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <br>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">[</font><font face="Bitstream Vera Sans Mono, sans-serif"><strike>pwm.getclock</strike>]
|
|
</font><font face="Bitstream Vera Sans Mono, sans-serif">Data
|
|
= pwm.getclock( id ): returns the base clock of the PWM block 'id'.</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;">
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <br>
|
|
</p>
|
|
<h3><a name="spimodule"></a>spi</h3>
|
|
<span style="font-weight: bold;"></span><br>
|
|
<big><span style="font-family: Helvetica,Arial,sans-serif;"></span><font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big><a name="spi_setup"></a>Actual_clock = spi.setup( id,
|
|
spi.MASTER | spi.SLAVE, clock, cpol, cpha,</big></font><span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>databits):
|
|
set the SPI interface with the given parameters, returns the clock</big></font><span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>that
|
|
was set for the interface.</big></font><span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<span style="font-family: Helvetica,Arial,sans-serif;">
|
|
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big><a name="spi_select"></a>spi.select(
|
|
</big></font><font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>id</big></font><font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>
|
|
): sets the selected spi as active (sets the SS line of the given
|
|
interface).</big></font><span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big> </big></font><span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big><a name="spi_unselect"></a>spi.unselect(
|
|
id ): clears the SS line of the given interface.</big></font><span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big> </big></font><span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big><a name="spi_send"></a>spi.send(
|
|
id, Data1, Data2, ... ): sends all the data to the specified SPI</big></font><span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>interface.</big></font><span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<span style="font-family: Helvetica,Arial,sans-serif;">
|
|
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big><a name="spi_sendrecv"></a>[</big></font><font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>spi.sendrecv(</big></font><font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>id,
|
|
Out1, Out2, ...</big></font><font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>)]
|
|
</big></font><font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>In1,
|
|
In2, ... = spi.send_recv( id, Out1, Out2, ... ): sends all the "out"
|
|
bytes</big></font><span style="font-family: Helvetica,Arial,sans-serif;"> </span><font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>to
|
|
the specified SPI interface and returts the data read after each sent
|
|
byte.</big></font><span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>Returning
|
|
several values in this blocking way would not complicate some queued
|
|
send implementations ? (ok, this could be another function :)</big></font><span style="font-family: Helvetica,Arial,sans-serif;">
|
|
</span><br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<br style="font-family: Helvetica,Arial,sans-serif;">
|
|
<font style="font-family: Helvetica,Arial,sans-serif;" size="2"><big>Sending multiple data/chars in a single
|
|
call and not in
|
|
a table argument does not allow the data to be built in run time
|
|
(without some string massage, of course :)</big></font><br>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
</big>
|
|
<h3><a name="sysmodule"></a>sys</h3>
|
|
<br>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="sys_platform"></a>[sys.platform()]
|
|
pd.platform(): returns the platform name (f.e. LM3S)</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;">
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="sys_mcu"></a>[sys.mcu()]
|
|
pd.cpu(): returns the CPU name (f.e. LM3S8962)</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="sys_cpu"></a>[sys.cpu()]
|
|
would return ARM Cortex M3 in this case.....</font></p>
|
|
<p style="margin-bottom: 0in;"><font face="Bitstream Vera Sans Mono, sans-serif"><br>
|
|
</font></p>
|
|
<font face="Bitstream Vera Sans Mono, sans-serif"> <a name="sys_board"></a>[sys.board()]</font><font face="Bitstream Vera Sans Mono, sans-serif">
|
|
pd.board(): returns the CPU board (f.e. EK-LM3S8962)</font>
|
|
<p style="margin-bottom: 0in;"> <br>
|
|
</p>
|
|
<h3><a name="term_termmodule">term</a></h3>
|
|
Terminal support
|
|
<p> <a name="term_clear"></a>[term.clear]
|
|
term.clrscr(): clear the screen </p>
|
|
<p> <br>
|
|
<a name="term_cleareol"></a>[term.cleareol]
|
|
term.clreol(): clear from the current cursor position to the end of the
|
|
line </p>
|
|
<p> </p>
|
|
<p><a name="term_moveto"></a> [term.moveto]
|
|
term.gotoxy( x, y ): position the cursor at the given coordinates<br>
|
|
</p>
|
|
<br>
|
|
<p><a name="term_moveup"></a> [term.moveup]
|
|
term.up( delta ): move the cursor up "delta" lines </p>
|
|
<p> </p>
|
|
<p><a name="term_movedown"></a> [term.movedown]
|
|
term.down( delta ): move the cursor down "delta" lines </p>
|
|
<p> </p>
|
|
<p><a name="term_moveleft"></a> [term.moveleft]
|
|
term.left( delta ): move the cursor left "delta" lines </p>
|
|
<p> <br>
|
|
<a name="term_moveright"></a>[term.moveright] term.right(
|
|
delta ): move the cursor right "delta" lines </p>
|
|
<p> </p>
|
|
<p><a name="term_getlinecount"></a>
|
|
[term.getlinecount] Lines = term.lines(): returns the number of lines </p>
|
|
<p> </p>
|
|
<p><a name="term_getcolcount"></a>
|
|
[term.getcolcount] Cols = term.cols(): returns the number of columns </p>
|
|
<p> </p>
|
|
<br>
|
|
<p><a name="term_printstr"></a> [term.printstr]
|
|
term.putstr( s1, s2, ... ): writes the specified string(s) to the
|
|
terminal<br>
|
|
</p>
|
|
<p> </p>
|
|
<p> [term.printchar] term.put( c1, c2, ... ): writes the
|
|
specified character(s) to the terminal </p>
|
|
<p> </p>
|
|
<p><a name="term_getx"></a> [term.getx] Cx =
|
|
term.cursorx(): return the cursor X position </p>
|
|
<p> </p>
|
|
<p> <a name="term_gety"></a>[term.gety] Cy =
|
|
term.cursory(): return the cursor Y position </p>
|
|
<p> </p>
|
|
<p> <font size="2"><a name="term_inputchar"></a>[term.inputchar]
|
|
c = term.getch( term.WAIT | term.NOWAIT ): returns a char read from the
|
|
</font> </p>
|
|
<font size="2"> terminal.</font>
|
|
<br style="font-family: Verdana;">
|
|
<br>
|
|
<br>
|
|
<h3><a name="tmr_tmrmodule"></a>tmr</h3>
|
|
<span style="font-weight: bold;"></span><big><br>
|
|
</big>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">It allows Lua to
|
|
execute timer specific operations (delay, read timer value,</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">start timer, get
|
|
time difference).</font></p><p style="margin-bottom: 0in;"><font face="Bitstream Vera Sans Mono, sans-serif">Some notes on timers:</font></p><ul><li>timers: from all the platforms on which eLua runs, only
|
|
the Luminary Cortex CPUs has rock solid 32-bit timers. You can do
|
|
pretty much everything you need with them. All the other platforms have
|
|
16-bit timers, which imposes some limits on the range of delays you can
|
|
achieve with them. Make sure to use tmr.mindelay(id) and
|
|
tmr.maxdelay(id) to check the actual resolution of your timers, and
|
|
adapt your code accordingly. To 'compensate' for this, it's not
|
|
possible to change the base timer frequency on the Cortex CPUs, but it
|
|
is possible on most other platforms :) So be sure to also check the
|
|
result of tmr.setclock(id)</li><li>also, when using timers,
|
|
remember that if you're using XMODEM and/or the "term" module, TMR0 is
|
|
used by both of them. So, if you change the TMR0 base clock in your
|
|
code, be sure to restore the original setting before returning to the
|
|
shell. You can change this static timer assignment by modifying
|
|
src/main.c. It might also be possible to change it dynamically in the
|
|
future, although I see little use for this.</li><li>PWM: the
|
|
Cortex CPUs have 6 PWM channels, but channels 0/1, 2/3 and 4/5
|
|
respectively share the same base clock setting. So, when you're
|
|
changing the base clock for channel 1, you're also changing the base
|
|
clock for channel 0; if channel 0 was already running, you won't like
|
|
what will happen next. This time no eLua function can save you, you
|
|
simply need you know your CPU architecture.</li></ul><p style="margin-bottom: 0in;">
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <br>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="tmr_delay"></a>tmr.delay( id, delay ): uses timer
|
|
'id' to wait for 'delay' us.</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <br>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><span style="font-style: italic;"><a name="tmr_read"></a></span>Data
|
|
= tmr.read( id ): reads the value of timer 'id'. The returned value is </font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">platform
|
|
dependent.</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;">
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><span style="font-style: italic;"><a name="tmr_start"></a></span>Data
|
|
= tmr.start( id ): start the timer 'id', and also returns its value at</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">the moment of
|
|
start. The returned value is platform dependent.</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;">
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="tmr_diff"></a>diff
|
|
= tmr.diff( id, end, start ): returns the time difference (in us)
|
|
between</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">the timer values
|
|
'end' and 'start' (obtained from calling tmr.start or</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">tmr.read). The
|
|
order of end/start is irrelevant. </font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;">
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="tmr_mindelay"></a>Data = tmr.mindelay( id ): returns
|
|
the minimum delay (in us ) that can be </font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">achieved by
|
|
calling the tmr.delay function. If the return value is 0, the </font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">platform layer
|
|
is capable of executing sub-microsecond delays.</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;">
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="tmr_maxdelay"></a>Data = tmr.maxdelay( id ): returns
|
|
the maximum delay (in us) that can be</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">achieved by
|
|
calling the tmr.delay function.</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;">
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="tmr_setclock"></a>Data = tmr.setclock( id, clock ):
|
|
sets the clock of the given timer. Returns the</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif">actual clock set
|
|
for the timer.</font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;">
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="tmr_getclock"></a>Data = tmr.getclock( id ): return
|
|
the clock of the given timer.</font>
|
|
</p>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
<h3><a name="uartmodule"></a>uart</h3>
|
|
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="uart_setup"></a><span style="font-weight: bold;">uart.setup(</span></font><font style="font-weight: bold;" face="Bitstream Vera Sans Mono, sans-serif"> id, baud,
|
|
databits, </font>
|
|
</p><p style="margin-bottom: 0in; font-weight: bold;"> <font face="Bitstream Vera Sans Mono, sans-serif">uart.PARITY_EVEN
|
|
| uart.</font><font face="Bitstream Vera Sans Mono, sans-serif">PARITY</font><font face="Bitstream Vera Sans Mono, sans-serif">_ODD | uart.</font><font face="Bitstream Vera Sans Mono, sans-serif">PARITY</font><font face="Bitstream Vera Sans Mono, sans-serif">_NONE, </font>
|
|
</p>
|
|
<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><span style="font-weight: bold;">uart.STOPBITS_1
|
|
| uart.STOPBITS_1_5 | uart.STOPBITS_2
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)</span></font></p>
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<p style="margin-bottom: 0in;"><font face="Bitstream Vera Sans Mono, sans-serif"><span style="font-weight: bold;"></span> Set the UART interface with the given
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parameters.</font></p><p style="margin-bottom: 0in;"><font face="Bitstream Vera Sans Mono, sans-serif"> Returns the actual baud rate that was set for the UART.</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><br>
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</font></p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="uart_send"></a></font><font face="Bitstream Vera Sans Mono, sans-serif"><span style="font-weight: bold;">uart.send( id,
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Data1, Data2, ... )</span></font></p><p style="margin-bottom: 0in;"><font face="Bitstream Vera Sans Mono, sans-serif"><span style="font-weight: bold;"></span> Send all the data to the specified UART interface.</font>
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</p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><br>
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</font></p>
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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="uart_recv"></a></font><font face="Bitstream Vera Sans Mono, sans-serif">uart.recv(</font><font face="Bitstream Vera Sans Mono, sans-serif"> id,
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uart.TIMEOUT_NO | <strike>uart.TIMEOUT_INFINITE</strike> |
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timeout )</font><font face="Bitstream Vera Sans Mono, sans-serif">
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</font><font face="Bitstream Vera Sans Mono, sans-serif">Data =
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uart.recv( id, uart.NO_TIMEOUT | uart.INF_TIMEOUT | timeout )</font></p>
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<p style="margin-bottom: 0in;"><font face="Bitstream Vera Sans Mono, sans-serif"> Reads a byte from the
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specified UART interface.</font></p>
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<p style="margin-bottom: 0in;"></p>
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<p style="margin-bottom: 0in;">
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</p>
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<h2><a name="platdepmodules"></a>eLua Platform
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Dependent
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Modules</h2>A Platform Dependent eLua Module is a module that runs only on one or on a few <a href="status.html#platforms">supported eLua platforms</a>.<br>These
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modules make use of specifical devices and features offered by some
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kits and allow eLua aplications to make the best use of the external
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hardware on your platforms.<br><h3><a name="adcmodule"></a>adc - Analog to Digital Conversion Module</h3><span style="font-weight: bold;">Currently runs on:</span> LM3Sxxxx<br><br> The ADC module handles the Analog to Digital Conversion Peripherals.<br><br><br><a name="adc_sample"></a><span style="font-weight: bold;">adc.sample(channel_id)</span><br> Generate one processed sample.<br><br><a name="adc_getsamples"></a><span style="font-weight: bold;">adc.getsamples(channel_id,
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[count])</span><br> Request <span style="font-style: italic;">count</span> samples from the buffer.<br> if singular, an
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|
integer is returned. if multiple, a table of integers is returned. If
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<span style="font-style: italic;">count</span> is either zero or omitted, all available samples are returned.<br><br><a name="adc_maxval"></a><span style="font-weight: bold;">adc.maxval(channel_id)</span><br> Returns the largest integer one can expect fromr this channel on a given platform (based on bit depth).<br><br><a name="adc_samplesready"></a><span style="font-weight: bold;">adc.samplesready(channel_id)<br></span> Returns the number of samples waiting in the buffer.<br><br><a name="adc_dataready"></a><span style="font-weight: bold;">adc.dataready(channel_id)<br></span> If running in non-blocking mode, this will indicate if all of the
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samples requested from the last sample or <br>burst have been acquired and
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are waiting in the buffer.<br><br><a name="adc_setmode"></a><span style="font-weight: bold;">adc.setmode(channel_id,
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mode)<br></span> <span style="font-style: italic;">mode</span> 0 sets blocking mode. adc.getsamples will wait for
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requested samples to be captured before returning.<br> <span style="font-style: italic;">mode</span> 1 sets non-blocking mode<br><br><a name="adc_setsmoothing"></a><span style="font-weight: bold;">adc.setsmoothing(channel_id, length)<br></span> Set the length of the smoothing filter.<br> This must be a power of 2 (maximum = 128)<br><br><a name="adc_getsmoothing"></a><span style="font-weight: bold;">adc.getsmoothing(channel_id)<br></span> Get the current smoothing length in use.<br><br><a name="adc_burst"></a><span style="font-weight: bold;">adc.burst(
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channel_id, count, timer_id, frequency)<br></span> Request that <span style="font-style: italic;">count</span> samples be converted from <span style="font-style: italic;">channel_id</span>, using <span style="font-style: italic;">timer_id</span> at <span style="font-style: italic;">frequency.<br></span> <span style="font-style: italic;">count </span>must be greater than zero and a power of 2<br><br>
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<h3><a name="dispmodule"></a>disp</h3>
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<span style="font-weight: bold;">Currently runs on:</span> LM3S xxxx<br><br> The disp module handles the RIT OLED display usage on Luminary Micro Cortex-M3 boards<br>
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<p class="MsoNormal"><a name="disp_init"></a>
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|
disp.init </p>
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<p class="MsoNormal"> <br>
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|
</p>
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<p class="MsoNormal"><a name="disp_enable"></a>
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disp.enable </p>
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<p class="MsoNormal"> <br>
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</p>
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<p class="MsoNormal"><a name="disp_disable"></a>
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|
disp.disable </p>
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|
<p class="MsoNormal"> <br>
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|
</p>
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<p class="MsoNormal"> <a name="disp_on"></a>disp.on
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|
</p>
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<p class="MsoNormal"> <br>
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</p>
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|
<p class="MsoNormal"><a name="disp_off"></a>
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disp.off<br>
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|
</p>
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<p class="MsoNormal" style="color: rgb(0, 0, 255);">
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|
<br>
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|
</p>
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<a name="disp_print"></a>disp.print<br>
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|
<br>
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<p class="MsoNormal"><a name="disp_draw"></a>
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|
disp.draw </p>
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|
</body></html> |