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