/* * Driver for TI Texas Instruments HDC1080 Temperature/Humidity Sensor. * Code By Metin KOC * Sixfab Inc. metin@sixfab.com * Code based on ADXL345 driver. */ #include "module.h" #include "lauxlib.h" #include "platform.h" #include #include #include static const uint32_t hdc1080_i2c_id = 0; static const uint8_t hdc1080_i2c_addr = 0x40; #define HDC1080_TEMPERATURE_REGISTER 0X00 #define HDC1080_HUMIDITY_REGISTER 0X01 #define HDC1080_CONFIG_REGISTER 0X02 static int hdc1080_setup(lua_State* L) { // Configure Sensor platform_i2c_send_start(hdc1080_i2c_id); platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER); platform_i2c_send_byte(hdc1080_i2c_id, HDC1080_CONFIG_REGISTER); platform_i2c_send_byte(hdc1080_i2c_id, 0x05); //Bit[10] to 1 for 11 bit resolution , Set Bit[9:8] to 01 for 11 bit resolution. platform_i2c_send_byte(hdc1080_i2c_id, 0x00); platform_i2c_send_stop(hdc1080_i2c_id); return 0; } static int hdc1080_read(lua_State* L) { uint8_t data[2]; #ifdef LUA_NUMBER_INTEGRAL int temp; int humidity; #else float temp; float humidity; #endif int i; platform_i2c_send_start(hdc1080_i2c_id); platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER); platform_i2c_send_byte(hdc1080_i2c_id, HDC1080_TEMPERATURE_REGISTER); platform_i2c_send_stop(hdc1080_i2c_id); os_delay_us(7000); platform_i2c_send_start(hdc1080_i2c_id); platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER); for (i=0; i<2; i++) { data[i] = platform_i2c_recv_byte(hdc1080_i2c_id, 1); } platform_i2c_send_stop(hdc1080_i2c_id); #ifdef LUA_NUMBER_INTEGRAL temp = ((((data[0]<<8)|data[1])*165)>>16)-40; lua_pushinteger(L, (int)temp); #else temp = ((float)((data[0]<<8)|data[1])/(float)pow(2,16))*165.0f-40.0f; lua_pushnumber(L, temp); #endif platform_i2c_send_start(hdc1080_i2c_id); platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER); platform_i2c_send_byte(hdc1080_i2c_id, HDC1080_HUMIDITY_REGISTER); platform_i2c_send_stop(hdc1080_i2c_id); os_delay_us(7000); platform_i2c_send_start(hdc1080_i2c_id); platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER); for (i=0; i<2; i++) { data[i] = platform_i2c_recv_byte(hdc1080_i2c_id, 1); } platform_i2c_send_stop(hdc1080_i2c_id); #ifdef LUA_NUMBER_INTEGRAL humidity = ((((data[0]<<8)|data[1]))*100)>>16; lua_pushinteger(L, (int)humidity); #else humidity = ((float)((data[0]<<8)|data[1])/(float)pow(2,16))*100.0f; lua_pushnumber(L, humidity); #endif return 2; } LROT_BEGIN(hdc1080) LROT_FUNCENTRY( read, hdc1080_read ) LROT_FUNCENTRY( setup, hdc1080_setup ) LROT_END( hdc1080, NULL, 0 ) NODEMCU_MODULE(HDC1080, "hdc1080", hdc1080, NULL);