#include "stm32f0xx_hal.h"

#include "config.h"

#include "stringhelpers.h"

#include "states.h"

#include "gpio.h"

// Grab temperature reading from MAX31865

void max31865_readtemp(SPI_HandleTypeDef* hspi1, therm_settings_t* set, therm_status_t* status)

{

    // ** FIXME ** FIXME ** FIXME ** //

    // This is duplicated from MAX31855, update for MAX31865 registers/etc

    /////////////////////////////////// 

    // Assert CS

    HAL_GPIO_WritePin(MAX_CS, 0);

    uint8_t rxdatah[1] = {0x00};

    uint8_t rxdatal[1] = {0x00};

    HAL_SPI_Receive(hspi1, rxdatah, 1, 100);

    HAL_SPI_Receive(hspi1, rxdatal, 1, 100);

    // Release CS

    HAL_GPIO_WritePin(MAX_CS, 1);

    // Assemble data array into one var

    uint16_t temp_pre = rxdatal[0] | (rxdatah[0]<<8);

    if(temp_pre & 0b001 && !set->ignore_tc_error) {

        status->tc_errno = 1;

        HAL_Delay(400); // FIXME: remove?

        status->state_resume = status->state;

        status->state = STATE_TC_ERROR;

        status->temp = 0;

        status->temp_frac = 0;

    }

    else 

    {

        uint8_t sign = status->temp >> 15;// top bit is sign

        temp_pre = temp_pre >> 2; // Drop 2 lowest bits

        status->temp_frac = temp_pre & 0b11; // get fractional part

        status->temp_frac *= 25; // each bit is .25 a degree, up to fixed point

        temp_pre = temp_pre >> 2; // Drop 2 fractional bits 

        int8_t signint;

        if(sign) {

            signint = -1;

        }

        else {

            signint = 1;

        }

        // Convert to Fahrenheit

        if(set->temp_units == TEMP_UNITS_FAHRENHEIT)

        {

            status->temp = signint * ((temp_pre*100) + status->temp_frac);

            status->temp = status->temp * 1.8;

            status->temp += 3200;

            status->temp_frac = status->temp % 100;

            status->temp /= 100;

            status->temp += set->temp_offset;

        }

        // Use Celsius values

        else

        {

            status->temp = temp_pre * signint;

            status->temp += set->temp_offset;

        }

    }

}

// vim:softtabstop=4 shiftwidth=4 expandtab 

#ifndef MAX31865_H 

#define MAX31865_H 

void max31865_readtemp(SPI_HandleTypeDef* hspi1, therm_settings_t* set, therm_status_t* status);

#endif

// vim:softtabstop=4 shiftwidth=4 expandtab