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