Load calibration when SD card is inserted.

* Load calibration when SD card is inserted and controller is not yet calibrated
* Fix #7: LED0 blinks when SD is inserted / removed.

stm-firmware/adc-meas.c

@@ -199,12 +199,12 @@ void adc_pt1000_set_resistance_calibration(float offset, float sensitivity_devia
 
 void adc_pt1000_get_resistance_calibration(float *offset, float *sensitivity_deviation, bool *active)
 {
-	if (!offset || !sensitivity_deviation || !active)
-		return;
-
-	*offset = pt1000_offset;
-	*sensitivity_deviation = pt1000_sens_dev;
-	*active = calibration_active;
+	if (offset)
+		*offset = pt1000_offset;
+	if (sensitivity_deviation)
+		*sensitivity_deviation = pt1000_sens_dev;
+	if (active)
+		*active = calibration_active;
 }
 
 static inline float adc_pt1000_apply_calibration(float raw_resistance)

stm-firmware/main.c

@@ -44,6 +44,7 @@
 #include <fatfs/ff.h>
 #include <reflow-controller/reflow-menu.h>
 #include <reflow-controller/safety/safety-controller.h>
+#include <reflow-controller/settings/settings.h>
 
 static void setup_nvic_priorities(void)
 {
@@ -191,7 +192,12 @@ static void zero_ccm_ram(void)
 
 int main(void)
 {
+	bool cal_active;
+	float offset;
+	float sens;
+	int status;
 	bool sd_card_mounted = false;
+	bool sd_old;
 	shellmatta_handle_t shell_handle;
 	int menu_wait_request;
 	uint64_t quarter_sec_timestamp = 0ULL;
@@ -204,7 +210,25 @@ int main(void)
 	while (1) {
 
 		if (systick_ticks_have_passed(quarter_sec_timestamp, 250)) {
+			sd_old = sd_card_mounted;
 			sd_card_mounted = mount_sd_card_if_avail(sd_card_mounted);
+
+			if (sd_old != sd_card_mounted) {
+				led_set(0, 1);
+			} else {
+				led_set(0, 0);
+			}
+
+			if (sd_card_mounted && !sd_old) {
+				adc_pt1000_get_resistance_calibration(NULL, NULL, &cal_active);
+				if (!cal_active) {
+					status = settings_load_calibration(&sens, &offset);
+					if (!status) {
+						adc_pt1000_set_resistance_calibration(offset, sens, true);
+					}
+				}
+			}
+
 			quarter_sec_timestamp = systick_get_global_tick();
 		}
 

stm-firmware/settings/settings-sd-card.c

@@ -161,7 +161,7 @@ int sd_card_settings_try_load_calibration(float *sens_deviation, float *offset)
 {
 	char path[128];
 	int status;
-	int ret = -2;
+	int ret = 0;
 
 	if (!sens_deviation || !offset)
 		return -1000;