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@@ -0,0 +1,87 @@
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+// Module for interfacing with sigma-delta hardware
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+
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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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+
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+
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+// Lua: setup( pin )
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+static int sigma_delta_setup( lua_State *L )
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+{
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+ int pin = luaL_checkinteger( L, 1 );
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+
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+ MOD_CHECK_ID(sigma_delta, pin);
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+
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+ platform_sigma_delta_setup( pin );
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+
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+ return 0;
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+}
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+
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+// Lua: close( pin )
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+static int sigma_delta_close( lua_State *L )
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+{
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+ int pin = luaL_checkinteger( L, 1 );
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+
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+ MOD_CHECK_ID(sigma_delta, pin);
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+
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+ platform_sigma_delta_close( pin );
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+
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+ return 0;
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+}
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+
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+
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+// Lua: setpwmduty( duty_cycle )
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+static int sigma_delta_setpwmduty( lua_State *L )
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+{
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+ int duty = luaL_checkinteger( L, 1 );
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+
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+ if (duty < 0 || duty > 255) {
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+ return luaL_error( L, "wrong arg range" );
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+ }
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+
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+ platform_sigma_delta_set_pwmduty( duty );
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+
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+ return 0;
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+}
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+
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+// Lua: setprescale( value )
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+static int sigma_delta_setprescale( lua_State *L )
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+{
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+ int prescale = luaL_checkinteger( L, 1 );
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+
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+ if (prescale < 0 || prescale > 255) {
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+ return luaL_error( L, "wrong arg range" );
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+ }
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+
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+ platform_sigma_delta_set_prescale( prescale );
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+
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+ return 0;
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+}
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+
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+// Lua: settarget( value )
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+static int sigma_delta_settarget( lua_State *L )
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+{
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+ int target = luaL_checkinteger( L, 1 );
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+
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+ if (target < 0 || target > 255) {
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+ return luaL_error( L, "wrong arg range" );
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+ }
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+
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+ platform_sigma_delta_set_target( target );
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+
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+ return 0;
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+}
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+
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+
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+// Module function map
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+static const LUA_REG_TYPE sigma_delta_map[] =
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+{
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+ { LSTRKEY( "setup" ), LFUNCVAL( sigma_delta_setup ) },
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+ { LSTRKEY( "close" ), LFUNCVAL( sigma_delta_close ) },
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+ { LSTRKEY( "setpwmduty" ), LFUNCVAL( sigma_delta_setpwmduty ) },
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+ { LSTRKEY( "setprescale" ), LFUNCVAL( sigma_delta_setprescale ) },
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+ { LSTRKEY( "settarget" ), LFUNCVAL( sigma_delta_settarget ) },
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+ { LNILKEY, LNILVAL }
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+};
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+
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+NODEMCU_MODULE(SIGMA_DELTA, "sigma_delta", sigma_delta_map, NULL);
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