104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
|
|
|
|
#include "module.h"
|
|
#include "lauxlib.h"
|
|
#include <stdint.h>
|
|
|
|
#include "platform.h"
|
|
|
|
|
|
typedef enum {
|
|
LDHT_OK = 0,
|
|
LDHT_ERROR_CHECKSUM = -1,
|
|
LDHT_ERROR_TIMEOUT = -2,
|
|
LDHT_INVALID_VALUE = -999
|
|
} ldht_result_t;
|
|
|
|
typedef enum {
|
|
LDHT11,
|
|
LDHT2X
|
|
} ldht_type_t;
|
|
|
|
static int ldht_compute_data11( uint8_t *data, double *temp, double *humi )
|
|
{
|
|
*humi = data[0];
|
|
*temp = data[2];
|
|
|
|
uint8_t sum = data[0] + data[1] + data[2] + data[3];
|
|
return sum == data[4] ? LDHT_OK : LDHT_ERROR_CHECKSUM;
|
|
}
|
|
|
|
static int ldht_compute_data2x( uint8_t *data, double *temp, double *humi )
|
|
{
|
|
*humi = (data[0] * 256 + data[1]) * 0.1;
|
|
*temp = ((data[2] & 0x7f) * 256 + data[3]) * 0.1;
|
|
|
|
if (data[2] & 0x80)
|
|
*temp = - *temp;
|
|
|
|
uint8_t sum = data[0] + data[1] + data[2] + data[3];
|
|
return sum == data[4] ? LDHT_OK : LDHT_ERROR_CHECKSUM;
|
|
}
|
|
|
|
static int ldht_read_generic( lua_State *L, ldht_type_t type )
|
|
{
|
|
int stack = 0;
|
|
|
|
int gpio = luaL_checkint( L, ++stack );
|
|
luaL_argcheck( L, platform_gpio_output_exists( gpio ), stack, "invalid gpio" );
|
|
|
|
uint8_t data[5];
|
|
if (platform_dht_read( gpio,
|
|
type == LDHT11 ? PLATFORM_DHT11_WAKEUP_MS : PLATFORM_DHT2X_WAKEUP_MS,
|
|
data ) != PLATFORM_OK) {
|
|
lua_pushinteger( L, LDHT_ERROR_TIMEOUT );
|
|
return 1;
|
|
}
|
|
|
|
double temp, humi;
|
|
int res;
|
|
switch (type) {
|
|
case LDHT11:
|
|
res = ldht_compute_data11( data, &temp, &humi );
|
|
break;
|
|
case LDHT2X:
|
|
res = ldht_compute_data2x( data, &temp, &humi );
|
|
break;
|
|
default:
|
|
res = LDHT_INVALID_VALUE;
|
|
temp = humi = 0;
|
|
break;
|
|
}
|
|
lua_pushinteger( L, res );
|
|
lua_pushnumber( L, temp );
|
|
lua_pushnumber( L, humi );
|
|
int tempdec = (int)((temp - (int)temp) * 1000);
|
|
int humidec = (int)((humi - (int)humi) * 1000);
|
|
lua_pushinteger( L, tempdec );
|
|
lua_pushinteger( L, humidec );
|
|
|
|
return 5;
|
|
}
|
|
|
|
static int ldht_read11( lua_State *L )
|
|
{
|
|
return ldht_read_generic( L, LDHT11 );
|
|
}
|
|
|
|
static int ldht_read2x( lua_State *L )
|
|
{
|
|
return ldht_read_generic( L, LDHT2X );
|
|
}
|
|
|
|
|
|
static const LUA_REG_TYPE dht_map[] = {
|
|
{ LSTRKEY( "read11" ), LFUNCVAL( ldht_read11 ) },
|
|
{ LSTRKEY( "read2x" ), LFUNCVAL( ldht_read2x ) },
|
|
{ LSTRKEY( "OK" ), LNUMVAL( LDHT_OK ) },
|
|
{ LSTRKEY( "ERROR_CHECKSUM" ), LNUMVAL( LDHT_ERROR_CHECKSUM ) },
|
|
{ LSTRKEY( "ERROR_TIMEOUT" ), LNUMVAL( LDHT_ERROR_TIMEOUT ) },
|
|
{ LNILKEY, LNILVAL }
|
|
};
|
|
|
|
NODEMCU_MODULE(DHT, "dht", dht_map, NULL);
|