therm Changeset - f34fa8317622 · protofusion repositories

Changeset - f34fa8317622

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cortex-f0

0 3 0

matthewreed - 9 years ago 2015-12-30 16:41:13

updated RTD code to support higher resolution readings and made some fixes to displaying them.

3 files changed with 18 insertions and 14 deletions:

display.c

max31865.c

system/stringhelpers.c

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display.c

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@@ @@ -21,26 +21,28 @@ static uint8_t sw_right_last = 0; @@
 #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 int16_t last_temp_frac = 21245;
 static int16_t last_state = STATE_IDLE;
 static uint8_t goto_mode = MODE_HEAT;
 static uint8_t reset_mode = RESET_REBOOT;
 // Display state machine
 void display_process(therm_settings_t* set, therm_status_t* status)
+{
     uint8_t state_changed = status->state != last_state;
     last_state = status->state;
     uint8_t temp_changed = status->temp != last_temp;
+    uint8_t temp_changed = status->temp != last_temp || status->temp_frac != last_temp_frac;
     last_temp = status->temp;
     last_temp_frac = status->temp_frac;
     uint8_t sw_btn = !HAL_GPIO_ReadPin(SW_BTN);
     uint8_t sw_up = !HAL_GPIO_ReadPin(SW_UP);
     uint8_t sw_down = !HAL_GPIO_ReadPin(SW_DOWN);
     uint8_t sw_left = !HAL_GPIO_ReadPin(SW_LEFT);
     uint8_t sw_right = !HAL_GPIO_ReadPin(SW_RIGHT);
@@ @@ -537,18 +539,19 @@ void display_process(therm_settings_t* s @@
     sw_left_last = sw_left;
     sw_right_last = sw_right;
+}
 static int32_t temp_last = 43002;
 static int32_t temp_frac_last = 43002;
 static int32_t setpoint_last = 10023;
 // Draw current setpoint on display
 static void draw_setpoint(therm_status_t* status) {
     // FIXME: need to do this when switching modes too
-    if(status->temp != temp_last || trigger_drawsetpoint) {
+    if(status->temp != temp_last || status->temp_frac != temp_frac_last || trigger_drawsetpoint) {
         char tempstr[3];
         itoa_fp(status->temp, status->temp_frac, tempstr);
         ssd1306_drawstringbig("      ", 3, 0);
         ssd1306_drawstringbig(tempstr, 3, 0);
+    }
@@ @@ -562,12 +565,13 @@ static void draw_setpoint(therm_status_t @@
         ssd1306_drawstringbig(tempstr, 3, 90);
+    }
     trigger_drawsetpoint = 0;
     setpoint_last = status->setpoint;
     temp_last = status->temp;
     temp_frac_last = status->temp_frac;
+}
 void display_startup_screen() {
     ssd1306_clearscreen();
     ssd1306_drawstring("therm v0.2", 1, 40);
     ssd1306_drawstring("protofusion.org/therm", 3, 0);

max31865.c

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@@ @@ -104,41 +104,41 @@ void max31865_readtemp(SPI_HandleTypeDef @@
         if(set->val.temp_units == TEMP_UNITS_FAHRENHEIT)
+        {
         	//use all fixed point math!
         	//convert adc to resistance
         	//Rrtd = adc / range * Rref
         	status->temp = adc_count * 9830 * 10;
         	status->temp /= 32768;
         	status->temp = (int32_t) adc_count * 48600L;
         	status->temp /= 32768L;
         	//resistance to temp
         	//(x - in1) * (cal2 - cal1) / (in2 - in1) + cal1
-        	status->temp = ((status->temp * 100) - 100000) * (39200 - 3200) / (175860 - 100000) + 3200;
+        	status->temp = ((status->temp) - 10000L) * (39200L - 3200L) / (17586L - 10000L) + 3200L;
         	//grab the fraction
-        	status->temp_frac = (status->temp / 10) % 10;
+        	status->temp_frac = (status->temp / 10) % 10L;
         	//scale back to degrees
-        	status->temp = status->temp / 100;
+        	status->temp = status->temp / 100L;
         	//add in the offset
             status->temp += set->val.temp_offset;
+        }
         // Convert to Celsius
         else
+        {
         	//use all fixed point math!
         	//convert adc to resistance
         	//Rrtd = adc / range * Rref
         	status->temp = adc_count * 9830 * 10;
         	status->temp /= 32768;
         	status->temp = (int32_t) adc_count * 48600L;
         	status->temp /= 32768L;
         	//resistance to temp
         	//(x - in1) * (cal2 - cal1) / (in2 - in1) + cal1
-        	status->temp = ((status->temp * 10) - 10000) * (20000 - 0) / (17586 - 10000) + 0;
+        	status->temp = (((status->temp) - 10000L) * (20000L- 0L)) / (17586L - 10000L) + 0L;
         	//grab the fraction
-        	status->temp_frac = (status->temp / 10) % 10;
+        	status->temp_frac = (status->temp / 10) % 100L;
         	//scale back to degrees
-        	status->temp = status->temp / 100;
+        	status->temp = status->temp / 100L;
         	//add in the offset
             status->temp += set->val.temp_offset;
+        }
+    }

system/stringhelpers.c

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 #include <inttypes.h>
 char const digit[] = "0123456789";
 char* zitoa(int16_t i, char b[]){
     char const digit[] = "0123456789";
     char* p = b;
     if(i<0){
         *p++ = '-';
         i *= -1;
+    }
     uint16_t shifter = i;
@@ @@ -19,13 +20,12 @@ char* zitoa(int16_t i, char b[]){ @@
         i = i/10;
     }while(i);
     return b;
+}
 char* itoa_fp(int16_t i, uint8_t frac, char b[]){
     char const digit[] = "0123456789";
     // set p to beginning of char array
     char* p = b;
     // If negative, set current char to '-' and inc, unnegate number
     if(i<0){

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