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Location: therm/max31865.c - annotation
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Reorganize, remove unneeded stuff
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#include "config.h"
#include "stringhelpers.h"
#include "states.h"
#include "gpio.h"
// Registers
#define MAX31855_REG_CONFIG 0x00
#define MAX31855_REG_RTD_MSB 0x01
#define MAX31855_REG_RTD_LSB 0x02
#define MAX31855_REG_HFAULT_THRESH_MSB 0x03
#define MAX31855_REG_HFAULT_THRESH_LSB 0x04
#define MAX31855_REG_LFAULT_THRESH_MSB 0x05
#define MAX31855_REG_LFAULT_THRESH_LSB 0x06
#define MAX31855_REG_FAULTSTATUS 0x07
#define MAX31855_REGWRITEMODIFIER 0x80
// Fields
#define MAX31865_CONF_VBIAS (1<<7)
#define MAX31865_CONF_CONVMODE (1<<6)
#define MAX31865_CONF_1SHOT (1<<5)
#define MAX31865_CONF_3WIRE (1<<4)
#define MAX31865_CONF_FAULT_NOACTION 0b0000
#define MAX31865_CONF_FAULT_AUTODELAY 0b0100
#define MAX31865_CONF_FAULT_MANUALELAY1 0b1000
#define MAX31865_CONF_FAULT_MANUALELAY2 0b1100
#define MAX31865_CONF_FAULT_CLEAR (1<<1)
#define MAX31865_CONF_50_60HZ_FILTER (1<<0)
// Grab temperature reading from MAX31865
void max31865_readtemp(SPI_HandleTypeDef* hspi1, therm_settings_t* set, therm_status_t* status)
{
///////////////////////////////////
// This is duplicated from MAX31855, update for MAX31865 registers/etc
///////////////////////////////////
// TODO: Set configuration register based on params in config.h (2-wire, 4-wire, etc RTD). This is register 0x00.
// 2-wire RTC or 2-wire (duh) NTC thermistor will be the only options
// Need option for resistance of RTD
// These options should be stored in the set structure and should be menu-selectable
// TODO: Read RTD msbs (0x01)
// TODO: Read RTD LSBs (0x02)
// 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->val.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->val.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->val.temp_offset;
}
// Use Celsius values
else
{
status->temp = temp_pre * signint;
status->temp += set->val.temp_offset;
}
}
}
// vim:softtabstop=4 shiftwidth=4 expandtab
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