/*
 * SHT40.c
 *
 *  Created on: Nov 15, 2021
 *      Author: angoosh
 */


#include "SHT40.h"
#include "main.h"

extern I2C_HandleTypeDef STH40_I2C_HANDLE;

void STH40_Read_Sensor_Data(STH40_COMMANDS command, float *retVal);

/* @brief Read sensor data of SHT40
 * @param command to send
 * @param returns temperature and humidity
 * @retval float temperature or humidity
 */
void STH40_Read_Sensor_Data(STH40_COMMANDS command, float *retVal){
	uint8_t data[1] = {command};
	uint8_t SHT40_data[6];

	if((command != Serial_Number) || (command != Soft_Reset)){
		HAL_I2C_Master_Transmit(&STH40_I2C_HANDLE, (STH40_ADDRESS << 1), data, 2, 0xFFFF);
		if((command == High_Precision) || (command == Medium_Precision) || (command == Low_Precision)){
			HAL_Delay(10);
		}
		else if((command == Heater_200mW_1s) || (command == Heater_110mW_1s) || (command == Heater_20mW_1s)){
			HAL_Delay(1010);
		}
		else{
			HAL_Delay(110);
		}
		HAL_I2C_Master_Receive(&STH40_I2C_HANDLE, (STH40_ADDRESS << 1), SHT40_data, 6, 0xFFFF);
		int t_ticks = SHT40_data[0] * 256 + SHT40_data[1];
		int rh_ticks = SHT40_data[3] * 256 + SHT40_data[4];

		float temp = -45 + 175 * t_ticks/65535;
		float hum = -6 + 125 * rh_ticks/65535;
		if(hum > 100){
			hum = 100;
		}
		if(hum < 0){
			hum = 0;
		}

		retVal[0] = temp;
		retVal[1] = hum;
	}
	else if(command == Serial_Number){
		HAL_I2C_Master_Transmit(&STH40_I2C_HANDLE, (STH40_ADDRESS << 1), data, 2, 0xFFFF);
		HAL_Delay(10);
		HAL_I2C_Master_Receive(&STH40_I2C_HANDLE, (STH40_ADDRESS << 1), SHT40_data, 6, 0xFFFF);
		retVal[0] = SHT40_data[0] * 256 + SHT40_data[1];
		retVal[1] = SHT40_data[3] * 256 + SHT40_data[4];
	}
	else{
		HAL_I2C_Master_Transmit(&STH40_I2C_HANDLE, (STH40_ADDRESS << 1), data, 2, 0xFFFF);
	}
}