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