therm Changeset - b77b97fa501d · protofusion repositories

Changeset - b77b97fa501d

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cortex-f0

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Ethan Zonca - 9 years ago 2015-08-23 19:25:58
ez@ethanzonca.com

Add max31865 register defs

1 file changed with 36 insertions and 1 deletions:

max31865.c

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max31865.c

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 #include "stm32f0xx_hal.h"
 #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)
+{
-    // ** FIXME ** FIXME ** FIXME ** //
+    ///////////////////////////////////
     // 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->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

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