nodemcu-firmware/app/modules/dht.c

// Module for interfacing with the DHTxx sensors (xx = 11-21-22-33-44).

#include "lualib.h"
#include "lauxlib.h"
#include "auxmods.h"
#include "lrotable.h"
#include "cpu_esp8266.h"
#include "dht.h"

#define NUM_DHT GPIO_PIN_NUM

// ****************************************************************************
// DHT functions
int platform_dht_exists( unsigned id )
{
  return ((id < NUM_DHT) && (id > 0));
}

// Lua: status, temp, humi, tempdec, humidec = dht.read( id )
static int dht_lapi_read( lua_State *L )
{
  unsigned id = luaL_checkinteger( L, 1 );
  MOD_CHECK_ID( dht, id );
  lua_pushinteger( L, dht_read_universal(id) );
  double temp = dht_getTemperature();
  double humi = dht_getHumidity();
  int tempdec = (int)((temp - (int)temp) * 1000);
  int humidec = (int)((humi - (int)humi) * 1000);
  lua_pushnumber( L, temp );
  lua_pushnumber( L, humi );
  lua_pushnumber( L, tempdec );
  lua_pushnumber( L, humidec );
  return 5;
}

// Lua: status, temp, humi, tempdec, humidec = dht.read11( id ))
static int dht_lapi_read11( lua_State *L )
{
  unsigned id = luaL_checkinteger( L, 1 );
  MOD_CHECK_ID( dht, id );
  lua_pushinteger( L, dht_read11(id) );
  double temp = dht_getTemperature();
  double humi = dht_getHumidity();
  int tempdec = (int)((temp - (int)temp) * 1000);
  int humidec = (int)((humi - (int)humi) * 1000);
  lua_pushnumber( L, temp );
  lua_pushnumber( L, humi );
  lua_pushnumber( L, tempdec );
  lua_pushnumber( L, humidec );
  return 5;
}

// Lua: status, temp, humi, tempdec, humidec = dht.readxx( id ))
static int dht_lapi_readxx( lua_State *L )
{
  unsigned id = luaL_checkinteger( L, 1 );
  MOD_CHECK_ID( dht, id );
  lua_pushinteger( L, dht_read(id) );
  double temp = dht_getTemperature();
  double humi = dht_getHumidity();
  int tempdec = (int)((temp - (int)temp) * 1000);
  int humidec = (int)((humi - (int)humi) * 1000);
  lua_pushnumber( L, temp );
  lua_pushnumber( L, humi );
  lua_pushnumber( L, tempdec );
  lua_pushnumber( L, humidec );
  return 5;
}

// // Lua: result = dht.humidity()
// static int dht_lapi_humidity( lua_State *L )
// {
//   lua_pushnumber( L, dht_getHumidity() );
//   return 1;
// }

// // Lua: result = dht.humiditydecimal()
// static int dht_lapi_humiditydecimal( lua_State *L )
// {
//   double value = dht_getHumidity();
//   int result = (int)((value - (int)value) * 1000);
//   lua_pushnumber( L, result );
//   return 1;
// }

// // Lua: result = dht.temperature()
// static int dht_lapi_temperature( lua_State *L )
// {
//   lua_pushnumber( L, dht_getTemperature() );
//   return 1;
// }

// // Lua: result = dht.temperaturedecimal()
// static int dht_lapi_temperaturedecimal( lua_State *L )
// {
//   double value = dht_getTemperature();
//   int result = (int)((value - (int)value) * 1000);
//   lua_pushnumber( L, result );
//   return 1;
// }

// Module function map
#define MIN_OPT_LEVEL   2
#include "lrodefs.h"
const LUA_REG_TYPE dht_map[] =
{
  { LSTRKEY( "read" ),  LFUNCVAL( dht_lapi_read ) },
  { LSTRKEY( "read11" ), LFUNCVAL( dht_lapi_read11 ) },
  { LSTRKEY( "readxx" ),  LFUNCVAL( dht_lapi_readxx ) },
#if LUA_OPTIMIZE_MEMORY > 0
  { LSTRKEY( "OK" ), LNUMVAL( DHTLIB_OK ) },
  { LSTRKEY( "ERROR_CHECKSUM" ), LNUMVAL( DHTLIB_ERROR_CHECKSUM ) },
  { LSTRKEY( "ERROR_TIMEOUT" ), LNUMVAL( DHTLIB_ERROR_TIMEOUT ) },
#endif
  { LNILKEY, LNILVAL }
};

LUALIB_API int luaopen_dht( lua_State *L )
{
#if LUA_OPTIMIZE_MEMORY > 0
  return 0;
#else // #if LUA_OPTIMIZE_MEMORY > 0
  luaL_register( L, AUXLIB_DHT, dht_map );

  // Add the constants

  return 1;
#endif // #if LUA_OPTIMIZE_MEMORY > 0
}