//
// MAX31856: Driver to configure and read temperature from the MAX31856 thermoouple-to-Digital IC
//

#include "max31856.h"
#include "states.h"

// Private variables
static float temp_latest = 0.0;
static float temp_avg = 0.0;

static SPI_HandleTypeDef* spiport;


// Initialize the MAX31856 driver
void max31856_init(SPI_HandleTypeDef* spi_port, GPIO_TypeDef* cs_port, uint32_t cs_pin, uint32_t sensor_type)
{
	// Set SPI port reference
	spiport = spi_port;

	// Configure the CS pin for output
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.Pin = cs_pin;
	GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
	GPIO_InitStruct.Pull = GPIO_NOPULL;
	GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
	HAL_GPIO_Init(cs_port, &GPIO_InitStruct);

	// MAX31856
	// - set to continuous conversion mode
	// - probably no filtering, we'll do that on this side of things
	// - set up to read the typical open/short faults but not the high/low alarms

	uint8_t data[] = {0,0,0,0};
	HAL_SPI_Transmit(spiport, data, 1, 100);

	// sensor type - could we just mask bits off? maybe optimize the enum for this
}

void max31856_process(void)
{
	// Read temperature from the MAX31856 (approx 10hz optimally)
	uint8_t data[] = {0,0,0,0};
	HAL_SPI_Transmit(spiport, data, 1, 100);

}


// Return latest temperature reading (unaveraged, deg C)
float max31856_latest_temp(void)
{
	return temp_latest;
}

// Return average temperature reading (deg C)
float max31856_avg_temp(void)
{
	return temp_latest;
}