am2320.c

/*
 * am2320.c
 *
 *  Created on: 04.08.2019
 *      Author: SimpleMethod
 *  Updated on: 01.10.2020
 *Copyright 2019 SimpleMethod
 *
 *Permission is hereby granted, free of charge, to any person obtaining a copy of
 *this software and associated documentation files (the "Software"), to deal in
 *the Software without restriction, including without limitation the rights to
 *use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 *of the Software, and to permit persons to whom the Software is furnished to do
 *so, subject to the following conditions:
 *
 *The above copyright notice and this permission notice shall be included in all
 *copies or substantial portions of the Software.
 *
 *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *THE SOFTWARE.
 ******************************************************************************
 */


#include "am2320.h"

Am2320_HandleTypeDef am2320_Init(I2C_HandleTypeDef* i2c_handle,uint8_t device_address) {
	Am2320_HandleTypeDef AM2320_;
	AM2320_.i2c_handle = i2c_handle;
	AM2320_.device_address = device_address;
	return AM2320_;
}

uint8_t am2320_ReadValue(Am2320_HandleTypeDef *am2320) {
	uint8_t registers[3] = { 0x03, 0x00, 0x04 };
	HAL_I2C_Master_Transmit(am2320->i2c_handle, am2320->device_address, 0x00, 0,
	HAL_MAX_DELAY);
	HAL_Delay(1);
	if (HAL_I2C_Master_Transmit(am2320->i2c_handle, am2320->device_address,registers, 3, HAL_MAX_DELAY) != HAL_OK) {
		return 1;
	}
	HAL_Delay(2);
	if (HAL_I2C_Master_Receive(am2320->i2c_handle, am2320->device_address,am2320->data, 8, HAL_MAX_DELAY) != HAL_OK) {
		return 2;
	}
	if (am2320->data[1] != 0x04 && am2320->data[0] != 0x03) {
		return 3;
	}
	return 0;
}

void am2320_GetTemperatureAndHumidity(Am2320_HandleTypeDef *am2320, float *temperature,float *humidity) {
	int read = am2320_ReadValue(am2320);
	if (read) {
		// Simple exception handling
	}
	uint16_t temp_temperature = (am2320->data[5] | am2320->data[4] << 8);
	if (temp_temperature & 0x8000) {
		temp_temperature = -(int16_t) (temp_temperature & 0x7fff);
	} else {
		temp_temperature = (int16_t) temp_temperature;
	}
	*temperature = (float) temp_temperature / 10.0;
	*humidity = (float) (am2320->data[3] | am2320->data[2] << 8) / 10.0;
}