144 lines
3.2 KiB
C
144 lines
3.2 KiB
C
// Module for interfacing with PWM
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#include "module.h"
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#include "lauxlib.h"
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#include "platform.h"
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#include <stdint.h>
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// Lua: realfrequency = setup( id, frequency, duty )
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static int lpwm_setup( lua_State* L )
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{
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s32 freq; // signed, to error check for negative values
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unsigned duty;
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unsigned id;
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id = luaL_checkinteger( L, 1 );
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if(id==0)
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return luaL_error( L, "no pwm for D0" );
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MOD_CHECK_ID( pwm, id );
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freq = luaL_checkinteger( L, 2 );
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if ( freq <= 0 )
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return luaL_error( L, "wrong arg range" );
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duty = luaL_checkinteger( L, 3 );
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if ( duty > NORMAL_PWM_DEPTH )
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// Negative values will turn out > 100, so will also fail.
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return luaL_error( L, "wrong arg range" );
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freq = platform_pwm_setup( id, (u32)freq, duty );
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if(freq==0)
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return luaL_error( L, "too many pwms." );
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lua_pushinteger( L, freq );
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return 1;
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}
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// Lua: close( id )
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static int lpwm_close( lua_State* L )
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{
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unsigned id;
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id = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( pwm, id );
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platform_pwm_close( id );
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return 0;
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}
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// Lua: start( id )
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static int lpwm_start( lua_State* L )
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{
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unsigned id;
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id = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( pwm, id );
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if (!platform_pwm_start( id )) {
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return luaL_error(L, "Unable to start PWM output");
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}
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return 0;
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}
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// Lua: stop( id )
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static int lpwm_stop( lua_State* L )
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{
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unsigned id;
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id = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( pwm, id );
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platform_pwm_stop( id );
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return 0;
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}
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// Lua: realclock = setclock( id, clock )
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static int lpwm_setclock( lua_State* L )
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{
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unsigned id;
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s32 clk; // signed to error-check for negative values
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id = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( pwm, id );
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clk = luaL_checkinteger( L, 2 );
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if ( clk <= 0 )
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return luaL_error( L, "wrong arg range" );
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clk = platform_pwm_set_clock( id, (u32)clk );
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lua_pushinteger( L, clk );
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return 1;
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}
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// Lua: clock = getclock( id )
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static int lpwm_getclock( lua_State* L )
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{
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unsigned id;
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u32 clk;
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id = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( pwm, id );
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clk = platform_pwm_get_clock( id );
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lua_pushinteger( L, clk );
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return 1;
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}
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// Lua: realduty = setduty( id, duty )
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static int lpwm_setduty( lua_State* L )
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{
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unsigned id;
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s32 duty; // signed to error-check for negative values
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id = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( pwm, id );
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duty = luaL_checkinteger( L, 2 );
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if ( duty > NORMAL_PWM_DEPTH )
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return luaL_error( L, "wrong arg range" );
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duty = platform_pwm_set_duty( id, (u32)duty );
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lua_pushinteger( L, duty );
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return 1;
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}
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// Lua: duty = getduty( id )
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static int lpwm_getduty( lua_State* L )
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{
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unsigned id;
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u32 duty;
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id = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( pwm, id );
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duty = platform_pwm_get_duty( id );
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lua_pushinteger( L, duty );
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return 1;
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}
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int lpwm_open( lua_State *L ) {
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platform_pwm_init();
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return 0;
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}
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// Module function map
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LROT_BEGIN(pwm, NULL, 0)
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LROT_FUNCENTRY( setup, lpwm_setup )
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LROT_FUNCENTRY( close, lpwm_close )
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LROT_FUNCENTRY( start, lpwm_start )
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LROT_FUNCENTRY( stop, lpwm_stop )
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LROT_FUNCENTRY( setclock, lpwm_setclock )
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LROT_FUNCENTRY( getclock, lpwm_getclock )
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LROT_FUNCENTRY( setduty, lpwm_setduty )
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LROT_FUNCENTRY( getduty, lpwm_getduty )
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LROT_END(pwm, NULL, 0)
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NODEMCU_MODULE(PWM, "pwm", pwm, lpwm_open);
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