/*
 * bme680.c
 *
 *  Created on: Feb 11, 2020
 *      Author: KamilB
 */
#include  "bme680.h"
void BME680_write8(uint8_t reg, uint8_t val){
	HAL_GPIO_WritePin(NSS_PORT, NSS_PIN, GPIO_PIN_RESET);
	reg = reg & ~0x80;
	uint8_t tx_buf[] = {reg, val};
	HAL_SPI_Transmit(&hspi2, tx_buf, 2, HAL_MAX_DELAY);
	HAL_GPIO_WritePin(NSS_PORT, NSS_PIN, GPIO_PIN_SET);
}
uint8_t BME680_read8(uint8_t reg){
	HAL_GPIO_WritePin(NSS_PORT, NSS_PIN, GPIO_PIN_RESET);
	reg = reg|0x80;
	uint8_t answer;
	HAL_SPI_Transmit(&hspi2, &reg, 1, HAL_MAX_DELAY);
	HAL_SPI_Receive(&hspi2, &answer, 1, HAL_MAX_DELAY);
	HAL_GPIO_WritePin(NSS_PORT, NSS_PIN, GPIO_PIN_SET);
	return answer;
}
uint8_t BME680_sread8(uint8_t reg){
	HAL_GPIO_WritePin(NSS_PORT, NSS_PIN, GPIO_PIN_RESET);
	reg = reg|0x80;
	uint8_t answer;
	HAL_SPI_TransmitReceive(&hspi2, &reg, &answer, 1, HAL_MAX_DELAY);
	HAL_GPIO_WritePin(NSS_PORT, NSS_PIN, GPIO_PIN_SET);
	return answer;
}
bool BME680_begin(){
	BME680_write8(RESET_REG, SOFT_RESET_MODE);
	HAL_Delay(500);
	uint8_t val;
	val = BME680_read8(ID_REG);
	if(val==0x61){
		return true;
	}
	return false;
}
uint8_t BME680_sample(){
	par_g[0] = BME680_read8(0xED);
	par_g[1] = BME680_read8(0xEC);
	par_g[1] <<= 8;
	par_g[1] += BME680_read8(0xEB);
	par_g[2] = BME680_read8(0xEE);
	res_heat_range = BME680_read8(0x02);
	res_heat_range <<=2;
	res_heat_range >>=6;
	res_heat_val = (int8_t)BME680_read8(0xEE);
	double var[5];
	var[0] = ((double)par_g[0]/16.0)+49.0;
	var[1] = (((double)par_g[1]/32768.0)*0.0005)+0.00235;
	var[2] = (double)par_g[2]/1024.0;
	var[3] = var[0]*(1.0+(var[1]*(double)300));
	var[4] = var[3] + (var[2]*18.0);
	uint8_t res_heat_x = (uint8_t)(3.4*((var[4]*(4.0/(4.0+(double)res_heat_range))*(1.0/(1.0+((double)res_heat_val*0.002))))-25));
	BME680_write8(GAS_WAIT0_REG, 0x87);
	BME680_write8(RES_HEAT0_REG, res_heat_x);
	BME680_write8(CTRL_GAS1_REG, 0x10);
	BME680_write8(CTRL_GAS0_REG, 0x00);
	BME680_write8(CTRL_HUM_REG, 0x01);
	BME680_write8(CONFIG_REG, 0x08);
	BME680_write8(CTRL_MEAS_REG, 0x55);
	res_heat_x = BME680_read8(GAS_WAIT0_REG);




	return res_heat_x;
}
uint8_t BME680_readgas(){
	uint8_t valid = BME680_read8(GAS_R_LSB_REG);



	return valid;

}