therm Changeset - 860001bb7681 · protofusion repositories

Changeset - 860001bb7681

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cortex-f0

0 8 1

matthewreed - 9 years ago 2015-12-19 18:28:02

Added initial RTD support

9 files changed with 130 insertions and 70 deletions:

MAX31865.pdf

bin+new file

config.h

display.c

main.c

max31855.c

max31855.h

max31865.c

max31865.h

states.h

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MAX31865.pdf

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		new file 100644
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config.h

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 #ifndef CONFIG_H
 #define CONFIG_H
 // Temperature sensor type
 #define MAX31855_TC_SENSOR
 //#define MAX31865_RTD_SENSOR
 //#define MAX31855_TC_SENSOR
 #define MAX31865_RTD_SENSOR
 // Virtual serial port transmit rate
 #define VCP_TX_FREQ 1000
 // Solid-state relay maximum on-time
 #define SSR_PERIOD 200
 // Interval of PID calculations
 #define PID_PERIOD 120

display.c

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 #include "stm32f0xx_hal.h"
 #include "ssd1306.h"
 #include "stringhelpers.h"
 #include "display.h"
 #include "config.h"
 #include "states.h"
 #include "syslib.h"
 #include "flash.h"
 #include "gpio.h"
 #ifdef MAX31865_RTD_SENSOR
 #include "max31865.h"
 #endif
 // Private function prototypes
 static void draw_setpoint(therm_status_t* status);
 // Button transition variables
 static uint8_t sw_btn_last = 0;
 static uint8_t sw_up_last = 0;
 static uint8_t sw_down_last = 0;
 static uint8_t sw_left_last = 0;
 static uint8_t sw_right_last = 0;
 // Buttonpress macros
 #define SW_BTN_PRESSED (sw_btn_last == 0 && sw_btn == 1) // rising edge on buttonpress
 #define SW_UP_PRESSED (sw_up_last == 0 && sw_up == 1)
 #define SW_DOWN_PRESSED (sw_down_last == 0 && sw_down == 1)
 #define SW_LEFT_PRESSED (sw_left_last == 0 && sw_left == 1)
 #define SW_RIGHT_PRESSED (sw_right_last == 0 && sw_right == 1)
 // States
 static uint8_t trigger_drawsetpoint = 1;
 static int16_t last_temp = 21245;
-static uint8_t goto_mode = 2;
+static uint8_t goto_mode = MODE_HEAT;
 // Display state machine
 void display_process(therm_settings_t* set, therm_status_t* status)
+{
     uint8_t last_state = status->state;
     uint8_t temp_changed = status->temp != last_temp;
     last_temp = status->temp;
     uint8_t sw_btn = !HAL_GPIO_ReadPin(SW_BTN);
@@ @@ -61,77 +64,77 @@ void display_process(therm_settings_t* s @@
             if(temp_changed) {
                 char tempstr[6];
                 itoa_fp(status->temp, status->temp_frac, tempstr);
                 ssd1306_drawstring("Temp: ", 3, 40);
                 ssd1306_drawstring("    ", 3, 72);
                 ssd1306_drawstring(tempstr, 3, 72);
+            }
             ssd1306_drawlogo();
             switch(goto_mode) {
-                case 3:
+                case MODE_BOOTLOADER:
+                {
                     ssd1306_drawstring("-> loader   ", 1, 40);
                 } break;
-                case 2:
+                case MODE_HEAT:
+                {
                     ssd1306_drawstring("-> heat     ", 1, 40);
                 } break;
-                case 1:
+                case MODE_SETUP:
+                {
                     ssd1306_drawstring("-> setup    ", 1, 40);
                 } break;
-                case 0:
+                case MODE_RESET:
+                {
                     ssd1306_drawstring("-> reset    ", 1, 40);
+                }
+            }
             // Button handler
             if(SW_BTN_PRESSED) {
                 switch(goto_mode) {
-                    case 3:
+                    case MODE_BOOTLOADER:
+                    {
                         ssd1306_clearscreen();
                         ssd1306_drawstring("Bootloader Entered", 0, 0);
                         ssd1306_drawstring("Device won't boot", 2, 0);
                         ssd1306_drawstring("until reflashed!", 3, 0);
                         bootloader_enter(); // Resets into bootloader
                         status->state = STATE_IDLE; // Just in case
                     } break;
-                    case 2:
+                    case MODE_HEAT:
                         status->state = STATE_PREHEAT;
                         break;
-                    case 1:
+                    case MODE_SETUP:
                         status->state = STATE_SETP;
                         break;
-                    case 0:
+                    case MODE_RESET:
                         status->state = STATE_IDLE;
                         //flash_erase();
                         NVIC_SystemReset();
                         break;
                     default:
                         status->state = STATE_PREHEAT;
+                }
+            }
-            else if(SW_UP_PRESSED && goto_mode < 3) {
+            else if(SW_DOWN_PRESSED && goto_mode < (MODE_SIZE - 1)) {
                 goto_mode++;
+            }
-            else if(SW_DOWN_PRESSED && goto_mode > 0) {
+            else if(SW_UP_PRESSED && goto_mode > 0) {
                 goto_mode--;
+            }
             // Event Handler
             // N/A
         } break;
         case STATE_SETP:
+        {
             // Write text to OLED
@@ @@ -395,67 +398,72 @@ void display_process(therm_settings_t* s @@
         } break;
         // Thermocouple error
         case STATE_TC_ERROR:
+        {
             // Write text to OLED
             // [ therm : ready to steam ]
             // [ 30 => 120 C            ]
             ssd1306_drawstring("Error:              ", 0, 0);
             char tempstr[6];
-            itoa(status->tc_errno, tempstr, 10);
+            itoa(status->error_code, tempstr, 10);
             ssd1306_drawstring(tempstr, 0, 57);
             if(status->tc_errno == 1)
             //TODO: add RTD error codes
             if(status->error_code == 1)
                 ssd1306_drawstring("    TC Open Circuit", 1, 0);
-            else if(status->tc_errno == 4)
+            else if(status->error_code == 4)
                 ssd1306_drawstring("    TC Short to GND", 1, 0);
-            else if(status->tc_errno == 8)
+            else if(status->error_code == 8)
                 ssd1306_drawstring("    TC Short to VCC", 1, 0);
             else
                 ssd1306_drawstring("#?, Unknown Error", 1, 0);
             ssd1306_drawstring("                    ", 2, 0);
             ssd1306_drawstring("-> to ignore all or", 2, 0);
             ssd1306_drawstring("press to continue", 3, 0);
             // Button handler
             if(SW_BTN_PRESSED) {
                 status->state = STATE_IDLE;
 				#ifdef MAX31865_RTD_SENSOR
 				max31865_clear_errors(spi_get());
 				#endif
+            }
             else if(SW_RIGHT_PRESSED) {
-                set->val.ignore_tc_error = 1;
+                set->val.ignore_error = 1;
                 status->state = STATE_IDLE;
+            }
             // Event Handler
             // Maybe handle if TC is plugged in
             // N/A
         } break;
         // Something is terribly wrong
         default:
+        {
             status->state = STATE_IDLE;
             status->pid_enabled = 0;
         } break;
+    }
     if(last_state != status->state) {
         // Clear screen on state change
-        goto_mode = 2;
+        goto_mode = MODE_HEAT;
         trigger_drawsetpoint = 1;
         ssd1306_clearscreen();
+    }
     // Last buttonpress
     sw_btn_last = sw_btn;
     sw_up_last = sw_up;
     sw_down_last = sw_down;
     sw_left_last = sw_left;
     sw_right_last = sw_right;
+}

main.c

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 #include "stm32f0xx_hal.h"
 #include "config.h"
 #include "syslib.h"
 #include "pid.h"
 #include "states.h"
 #include "ssd1306.h"
 #include "max31855.h"
 #include "max31865.h"
 #include "gpio.h"
 #include "spi.h"
 #include "flash.h"
 #include "stringhelpers.h"
 #include "display.h"
 #include "usb_device.h"
 #include "usbd_cdc_if.h"
 therm_settings_t set;
 therm_status_t status;
@@ @@ -39,36 +40,40 @@ int main(void) @@
     // USB startup delay
     HAL_Delay(500);
     HAL_GPIO_WritePin(LED_POWER, 1);
     // Enter into bootloader if up button pressed on boot
     if(!HAL_GPIO_ReadPin(SW_UP))
         bootloader_enter();
     // Init SPI busses
     spi_init();
     #ifdef MAX31865_RTD_SENSOR
     max31865_config(spi_get());
     #endif
     // Init OLED over SPI
     ssd1306_init();
     ssd1306_clearscreen();
     // Default settings
     set.val.boottobrew = 0;
     set.val.temp_units = TEMP_UNITS_FAHRENHEIT;
     set.val.windup_guard = 10;
     set.val.k_p = 10;
     set.val.k_i = 1;
     set.val.k_d = 1;
-    set.val.ignore_tc_error = 0;
+    set.val.ignore_error = 0;
     set.val.setpoint_brew = 70;
     set.val.setpoint_steam = 70;
     // Default status
     status.temp = 0;
     status.temp_frac = 0;
     status.state_resume = 0;
     status.state = STATE_IDLE;
     status.setpoint = 70;
     status.pid_enabled = 0;
     // Go to brew instead of idle if configured thusly
@@ @@ -102,25 +107,25 @@ int main(void) @@
         if(HAL_GetTick() - last_led > 400)
+        {
             last_led = HAL_GetTick();
+        }
         if((HAL_GetTick() - last_pid > PID_PERIOD))
+        {
             #ifdef MAX31855_TC_SENSOR
             max31855_readtemp(spi_get(), &set, &status); // Read MAX31855
             #endif
             #ifdef MAX31865_RTD_SENSOR
             max31865_readtemp(&set, &status);
+            max31865_readtemp(spi_get(), &set, &status);
             #endif
             if(status.pid_enabled)
+            {
                 // Get ssr output for next time
                 int16_t power_percent = pid_update(set.val.k_p, set.val.k_i, set.val.k_d, status.temp, status.temp_frac, status.setpoint, &set, &status);
                 //power-percent is 0-1000?
                 ssr_output = power_percent; //(((uint32_t)SSR_PERIOD * (uint32_t)10 * (uint32_t)100) * power_percent) / (uint32_t)1000000;
+            }
             else
+            {

max31855.c

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 #include "stm32f0xx_hal.h"
 #include "config.h"
 #include "stringhelpers.h"
 #include "states.h"
 #include "gpio.h"
 #include "max31865.h"
 // Grab temperature reading from MAX31855
 void max31855_readtemp(SPI_HandleTypeDef* hspi1, therm_settings_t* set, therm_status_t* status)
+{
     // 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);
@@ @@ -22,26 +17,26 @@ void max31855_readtemp(SPI_HandleTypeDef @@
     // Assemble data array into one var
     uint16_t temp_pre = rxdatal[0] | (rxdatah[0]<<8);
 /*
     if(temp_pre & 0b010) {
         ssd1306_clearscreen();
         HAL_Delay(400); // FIXME: remove?
         status.tc_errno = 4;
         status.state = STATE_TC_ERROR;
         status.temp = 0;
         status.temp_frac = 0;
     } */
     if(temp_pre & 0b001 && !set->val.ignore_tc_error) {
         status->tc_errno = 1;
     if(temp_pre & 0b001 && !set->val.ignore_error) {
         status->error_code = 1;
         HAL_Delay(400); // FIXME: remove?
         status->state_resume = status->state;
         status->state = STATE_TC_ERROR;
         status->temp = 0;
         status->temp_frac = 0;
     }/*
     else if(temp_pre & 0b100 && !set.ignore_tc_error) {
         status.tc_errno = 8;
         HAL_Delay(400); // FIXME: remove?
         status.state_resume = status.state;
         status.state = STATE_TC_ERROR;
         status.temp = 0;

max31855.h

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 #ifndef MAX31855_H
 #define MAX31855_H
 #include "stm32f0xx_hal.h"
 #include "config.h"
 #include "stringhelpers.h"
 #include "states.h"
 #include "gpio.h"
 void max31855_readtemp(SPI_HandleTypeDef* hspi1, therm_settings_t* set, therm_status_t* status);
 #endif
 // vim:softtabstop=4 shiftwidth=4 expandtab

max31865.c

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 #include "stm32f0xx_hal.h"
 #include "config.h"
 #include "stringhelpers.h"
 #include "states.h"
 #include "gpio.h"
 #include "max31855.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 MAX31865_REG_CONFIG 0x00
 #define MAX31865_REG_RTD_MSB 0x01
 #define MAX31865_REG_RTD_LSB 0x02
 #define MAX31865_REG_HFAULT_THRESH_MSB 0x03
 #define MAX31865_REG_HFAULT_THRESH_LSB 0x04
 #define MAX31865_REG_LFAULT_THRESH_MSB 0x05
 #define MAX31865_REG_LFAULT_THRESH_LSB 0x06
 #define MAX31865_REG_FAULTSTATUS 0x07
-#define MAX31855_REGWRITEMODIFIER 0x80
+#define MAX31865_REG_WRITE_MODIFIER 0x80
 // Fields
 #define MAX31865_CONF_VBIAS (1<<7)
-#define MAX31865_CONF_CONVMODE (1<<6)
+#define MAX31865_CONF_AUTO_CONVERT (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)
 void max31865_config(SPI_HandleTypeDef* hspi1)
+{
     uint8_t config = 0x00;
     config |= MAX31865_CONF_VBIAS;
     config |= MAX31865_CONF_AUTO_CONVERT;
     config |= MAX31865_CONF_FAULT_CLEAR;
     uint8_t reg = (MAX31865_REG_WRITE_MODIFIER | MAX31865_REG_CONFIG);
     // Assert CS
     HAL_GPIO_WritePin(MAX_CS, 0);
     HAL_SPI_Transmit(hspi1, &reg, 1, 100);
     HAL_SPI_Transmit(hspi1, &config, 1, 100);
     // Release CS
     HAL_GPIO_WritePin(MAX_CS, 1);
+}
 void max31865_clear_errors(SPI_HandleTypeDef* hspi1) {
 	max31865_config(hspi1);
+}
 // 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 regh = MAX31865_REG_RTD_MSB;
     uint8_t rxdatah[1] = {0x00};
     uint8_t rxdatal[1] = {0x00};
     HAL_SPI_Transmit(hspi1, &regh, 1, 100);
     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;
     uint16_t temp_pre = (rxdatah[0]<<8) | rxdatal[0];
     if((rxdatah[0] & 0x80) && !set->val.ignore_error) {
         // Assert CS
         HAL_GPIO_WritePin(MAX_CS, 0);
         uint8_t reg = MAX31865_REG_FAULTSTATUS;
         uint8_t data[1] = {0x11};
         HAL_SPI_Transmit(hspi1, &reg, 1, 100);
         HAL_SPI_Receive(hspi1, data, 1, 100);
         // Release CS
         HAL_GPIO_WritePin(MAX_CS, 1);
         status->error_code = data[0];
         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 decimal
         //temp_pre = temp_pre >> 1;
         uint16_t adc_count = temp_pre & 0x7FFF; //do some scaling?
         // 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 = adc_count;
             //convert to fahrenheit
             status->temp += set->val.temp_offset;
+        }
         // Use Celsius values
         else
+        {
             status->temp = temp_pre * signint;
             //convert to celsius
             int32_t temp = (((int32_t) adc_count) / 32) - 256;
             status->temp = temp;
             status->temp += set->val.temp_offset;
+        }
+    }
+}
 // vim:softtabstop=4 shiftwidth=4 expandtab

max31865.h

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 #ifndef MAX31865_H
 #define MAX31865_H
 #include "stm32f0xx_hal.h"
 #include "config.h"
 #include "stringhelpers.h"
 #include "states.h"
 #include "gpio.h"
 #include "spi.h"
 void max31865_config(SPI_HandleTypeDef* hspi1);
 void max31865_clear_errors(SPI_HandleTypeDef* hspi1);
 void max31865_readtemp(SPI_HandleTypeDef* hspi1, therm_settings_t* set, therm_status_t* status);
 #endif
 // vim:softtabstop=4 shiftwidth=4 expandtab

states.h

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 #ifndef STATES_H
 #define STATES_H
 typedef struct {
     int32_t temp;
     uint8_t temp_frac;
     uint8_t state_resume;
     uint8_t state;
     int32_t setpoint;
     uint8_t pid_enabled;
-    uint8_t tc_errno;
+    uint8_t error_code;
 } therm_status_t;
 typedef union
+{
      struct {
         uint32_t boottobrew;
         uint32_t temp_units;
         uint32_t windup_guard;
         uint32_t k_p;
         uint32_t k_i;
         uint32_t k_d;
         int32_t temp_offset;
-        uint32_t ignore_tc_error;
+        uint32_t ignore_error;
         int32_t setpoint_brew;
         int32_t setpoint_steam;
     } val;
     uint16_t data[128];
 } therm_settings_t;
 enum tempunits {
     TEMP_UNITS_CELSIUS = 0,
     TEMP_UNITS_FAHRENHEIT,
 };
@@ @@ -43,13 +43,21 @@ enum state { @@
     STATE_SETSTEPS,
     STATE_SETWINDUP,
     STATE_SETBOOTTOBREW,
     STATE_SETUNITS,
     STATE_SETTEMPOFFSET,
     STATE_PREHEAT,
     STATE_MAINTAIN,
     STATE_TC_ERROR,
 };
 enum GOTO_MODE {
 	MODE_HEAT = 0,
 	MODE_SETUP,
 	MODE_RESET,
 	MODE_BOOTLOADER,
 	MODE_SIZE,
 };
 #endif

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