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https://github.com/elua/elua.git
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184 lines
6.6 KiB
HTML
184 lines
6.6 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Strict//EN">
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<html><head>
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<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
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<meta http-equiv="Content-Language" content="en-us"><title>Product</title>
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<link rel="stylesheet" type="text/css" href="../style.css">
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</head>
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<body style="background-color: rgb(255, 255, 255);">
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<h3><a name="over"></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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<p style="margin-bottom: 0in;"> <font face="Bitstream Vera Sans Mono, sans-serif"><a name="write32"></a>write32( address, data ) : write
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the 32-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="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="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="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="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="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="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="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="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;"> <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 style="font-family: Verdana;">
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<br>
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</body></html>
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