another part of the LM3SS1968 port

romfs/EK-LM3S1968.lua

@@ -0,0 +1,34 @@
+--   This auxiliar platform dependent module defines some hardware devices
+-- available in the specific development kit.
+--   It will be automatically require()d when eLua detects it is running on the
+-- respective platform, exposing auxiliar constants and functions to facilitate
+-- and keep portable the access to the underlying hardware.
+--   The code configures the MCU to interface with the platform devices and
+-- exposes the following  objects, constants and fuctions:
+-- Onboard Buttons:
+--    BTN_UP, BTN_DOWN, BTN_LEFT, BTN_RIGHT, BTN_SELECT
+-- Onboard LED:
+-- Auxiliar Function:
+--    btn_pressed( button )
+--    returns true if the arg button is pressed, false otherwise
+
+local pio = pio
+  
+module(...)
+
+BTN_UP      = pio.PG_3
+BTN_DOWN    = pio.PG_4
+BTN_LEFT    = pio.PG_5
+BTN_RIGHT   = pio.PG_6
+BTN_SELECT  = pio.PG_7
+
+btn_pressed = function( button )
+  return pio.pin.getval( button ) == 0
+end
+
+LED_1 = pio.PG_2
+
+pio.pin.setdir( pio.INPUT, BTN_UP, BTN_DOWN, BTN_LEFT, BTN_RIGHT, BTN_SELECT )
+pio.pin.setpull( pio.PULLUP, BTN_UP, BTN_DOWN, BTN_LEFT, BTN_RIGHT, BTN_SELECT )
+pio.pin.setdir( pio.OUTPUT, LED_1 )
+