fix float formatting

Core/Src/Gui/app_gui.c

@@ -124,7 +124,6 @@ void switch_screen(screen_t pScreen, bool init) {
     s_app.initial_pushed = s_app.pushed;
     s_app.screen = pScreen;
     // clear the union field
-    memset(&s_app.page, 0, sizeof(s_app.page));
     request_paint();
 
     if (init) {

Core/Src/Gui/app_gui.h

@@ -41,6 +41,7 @@ uint32_t push_time();
 void screen_home(GuiEvent event);
 void screen_manual(GuiEvent event);
 void screen_manual_menu(GuiEvent event);
+void screen_calibration(GuiEvent event);
 
 struct State {
     /// Latest oven temp readout
@@ -78,19 +79,6 @@ struct State {
 
     /// Pointer to the currently active screen func
     screen_t screen;
-
-    /// data specific for each of the screens (not persistent across screen switching)
-    union {
-        /// Generic menu
-        struct menu_state {
-            int pos;
-            int len;
-            uint32_t change_time;
-            uint32_t slide_end_time;
-            uint16_t text_slide;
-            uint8_t tick_counter;
-        } menu;
-    } page;
 };
 
 extern struct State s_app;

Core/Src/Gui/screen_calibration.c

@@ -0,0 +1,218 @@
+//
+// Created by MightyPork on 2023/04/09.
+//
+
+
+#include <stddef.h>
+#include <string.h>
+#include "app_gui.h"
+#include "app_heater.h"
+#include "screen_menu.h"
+#include "ufb/fb_text.h"
+#include "app_temp.h"
+#include "snprintf.h"
+#include "FreeRTOS.h"
+
+struct calib_state {
+    int phase;
+    float sample1;
+    float sample2;
+    int temp1;
+    int temp2;
+} s_calib;
+
+enum Phase {
+    PH_HELLO = 0,
+    PH_SAMPLE1,
+    PH_TEMP1,
+    PH_SAMPLE2,
+    PH_TEMP2,
+    PH_DONE,
+};
+
+static void next_phase() {
+    PUTS("Phase++\r\n");
+    s_calib.phase++;
+}
+
+static const char* hello_menu_opts[] = {
+        "Pokračovat",
+        "Zrušit",
+        NULL
+};
+
+static void hello_menu_cb(int opt) {
+    switch (opt) {
+        case 0:
+            // Continue
+            next_phase();
+            request_paint();
+            app_heater_manual_override(100);
+            break;
+
+        case 1:
+            switch_screen(screen_home, true);
+            break;
+    }
+}
+
+
+static const char* sample1_menu_opts[] = {
+        "Vzorek 1",
+        "Zrušit",
+        NULL
+};
+
+static void sample1_menu_cb(int opt) {
+    switch (opt) {
+        case 0:
+            // Continue
+            next_phase();
+            request_paint();
+            s_calib.sample1 = app_temp_read_oven_raw();
+            app_heater_manual_override(0);
+            break;
+
+        case 1:
+            app_heater_manual_override(-1);
+            switch_screen(screen_home, true);
+            break;
+    }
+}
+
+static const char* sample2_menu_opts[] = {
+        "Vzorek 2",
+        "Zrušit",
+        NULL
+};
+
+
+static void sample2_menu_cb(int opt) {
+    switch (opt) {
+        case 0:
+            // Continue
+            next_phase();
+            request_paint();
+            s_calib.sample2 = app_temp_read_oven_raw();
+            app_heater_manual_override(0);
+            break;
+
+        case 1:
+            app_heater_manual_override(-1);
+            switch_screen(screen_home, true);
+            break;
+    }
+}
+
+void screen_calibration(GuiEvent event)
+{
+    if (event == GUI_EVENT_SCREEN_INIT) {
+        memset(&s_calib, 0, sizeof(s_calib));
+        // continue to the rest - so the menu can be inited
+    }
+
+    int *pT;
+    switch (s_calib.phase) {
+        case PH_HELLO:
+            if (event == GUI_EVENT_PAINT) {
+                fb_text(FBW/2, 16, "Vychlaď", TEXT_CENTER, 1);
+                fb_text(FBW/2, 26, "troubu", TEXT_CENTER, 1);
+            }
+            screen_menu_offset(event, hello_menu_opts, hello_menu_cb, 30);
+            break;
+
+        case PH_SAMPLE1: // Heater is active, waiting for mark
+        case PH_SAMPLE2:
+            if (event == GUI_EVENT_PAINT) {
+                fb_text(FBW/2, 16, "Zapiš", TEXT_CENTER, 1);
+                fb_text(FBW/2, 26, "teplotu", TEXT_CENTER, 1);
+            }
+            if (s_calib.phase == PH_SAMPLE1) {
+                screen_menu_offset(event, sample1_menu_opts, sample1_menu_cb, 30);
+            } else {
+                screen_menu_offset(event, sample2_menu_opts, sample2_menu_cb, 30);
+            }
+            break;
+
+        case PH_TEMP1:
+        case PH_TEMP2:
+            if (s_calib.phase == PH_TEMP1) {
+                pT = &s_calib.temp1;
+            } else {
+                pT = &s_calib.temp2;
+            }
+
+            if (push_time() > pdMS_TO_TICKS(500)) {
+                input_sound_effect();
+                app_heater_manual_override_clear();
+                switch_screen(screen_home, true);
+                return;
+            }
+
+            switch (event) {
+                case GUI_EVENT_PAINT: {
+                    fb_text(FBW/2, 14, s_calib.phase == PH_TEMP1 ? "Teplota 1" : "Teplota 2", TEXT_CENTER, 1);
+                    SPRINTF(stmp, "%d°C", *pT);
+                    fb_text(FBW/2, 30, stmp, TEXT_CENTER | FONT_DOUBLE, 1);
+
+                    fb_text(2, FBH - 8 * 3, "←→Nastav", 0, 1);
+                    fb_text(2, FBH - 8 * 2, "> Potvrdit", 0, 1);
+                    fb_text(2, FBH - 8 * 1, "» Zrušit", 0, 1);
+                    return;
+                }
+
+                case GUI_EVENT_KNOB_PLUS: {
+                    if (*pT < 500) {
+                        *pT += 1;
+                        input_sound_effect();
+                        request_paint();
+                    }
+                    break;
+                }
+
+                case GUI_EVENT_KNOB_MINUS: {
+                    if (*pT > 0) {
+                        input_sound_effect();
+                        *pT -= 1;
+                        request_paint();
+                    }
+                    break;
+                }
+
+                case GUI_EVENT_KNOB_RELEASE: {
+                    next_phase();
+                    request_paint();
+
+                    if (s_calib.phase == PH_DONE) {
+                        app_heater_manual_override(-1);
+                        // TODO do the math
+                        PRINTF("Sample 1 %f, T1 %d\r\n", s_calib.sample1, s_calib.temp1);
+                        PRINTF("Sample 2 %f, T2 %d\r\n", s_calib.sample2, s_calib.temp2);
+
+                        float corrected1 = c_to_val((float) s_calib.temp1);
+                        float corrected2 = c_to_val((float) s_calib.temp2);
+
+                        float a = (corrected1 - corrected2) / (s_calib.sample1 - s_calib.sample2);
+                        float b = corrected1 - a * s_calib.sample1;
+
+                        app_temp_set_calib(a, b);
+                    } else {
+                        // for the next phase
+                        app_heater_manual_override(100);
+                    }
+                    break;
+                }
+            }
+            break;
+
+        case PH_DONE:
+            if (event == GUI_EVENT_PAINT) {
+                fb_text(FBW/2, 14, "Hotovo", TEXT_CENTER, 1);
+                fb_text(FBW/2, 36, "→Hlavní menu", TEXT_CENTER, 1);
+            }
+            if (event == GUI_EVENT_KNOB_RELEASE) {
+                switch_screen(screen_home, 1);
+            }
+            break;
+    }
+}

Core/Src/Gui/screen_home.c

@@ -12,8 +12,8 @@
 static const char* main_menu_opts[] = {
         "Ruční režim",
         "Kalibrace",
-        "Programy",
+//        "Programy",
-        "Diagnostika",
+//        "Diagnostika",
         NULL
 };
 
@@ -23,7 +23,7 @@ static void main_menu_cb(int opt) {
             switch_screen(screen_manual, true);
             break;
         case 1:
-            // TODO
+            switch_screen(screen_calibration, true);
             break;
     }
 }

Core/Src/Gui/screen_manual.c

@@ -17,6 +17,8 @@ void screen_manual(GuiEvent event)
 {
     bool temp_changed = false;
     if (event == GUI_EVENT_SCREEN_INIT) {
+        app_heater_manual_override_clear();
+        app_heater_enable(false);
         return;
     }
 

Core/Src/Gui/screen_menu.c

@@ -3,6 +3,7 @@
 //
 
 #include <stdbool.h>
+#include <string.h>
 #include "screen_menu.h"
 #include "app_gui.h"
 #include "FreeRTOS.h"
@@ -12,40 +13,58 @@
 #include "ufb/framebuffer.h"
 #include "ufb/fb_text.h"
 
+struct menu_state {
+    int pos;
+    int len;
+    uint32_t change_time;
+    uint32_t slide_end_time;
+    uint16_t text_slide;
+    void * last_opts;
+} s_menu;
+
 
 void screen_menu(GuiEvent event, const char **options, menu_callback_t cb) {
+    screen_menu_offset(event, options, cb, 15);
+}
+
+void screen_menu_offset(GuiEvent event, const char **options, menu_callback_t cb, fbpos_t offset) {
+    if (event != GUI_EVENT_SCREEN_INIT && s_menu.last_opts != (void*) options) {
+        // ensure the menu is properly inited when the options list changes.
+        screen_menu(GUI_EVENT_SCREEN_INIT, options, cb);
+    }
+
     bool menu_changed = false;
     const uint32_t tickNow = xTaskGetTickCount();
 
-    struct menu_state *menu = &s_app.page.menu;
-
     switch (event) {
         case GUI_EVENT_SCREEN_INIT:
-            menu->pos = 0;
+            memset(&s_menu, 0, sizeof(s_menu));
-            menu->len = 0;
+            s_menu.last_opts = (void*) options;
-            menu->change_time = tickNow;
+
-            menu->text_slide = 0;
+            s_menu.change_time = tickNow;
+
+            // count options
             const char **opt = options;
             while (*opt) {
-                menu->len++;
+                s_menu.len++;
                 opt++;
             }
             break;
 
         case GUI_EVENT_SCREEN_TICK:
             // long text sliding animation
-            if (tickNow - menu->change_time >= pdMS_TO_TICKS(500)) {
+            if (tickNow - s_menu.change_time >= pdMS_TO_TICKS(500)) {
-                const uint32_t textlen = utf8_strlen(options[menu->pos]) * 6;
+                const uint32_t textlen = utf8_strlen(options[s_menu.pos]) * 6;
                 if (textlen >= FBW - 2) {
-                    if (textlen - menu->text_slide > FBW - 1) {
+                    if (textlen - s_menu.text_slide > FBW - 1) {
-                        menu->text_slide += 1;
+                        s_menu.text_slide += 1;
-                        if (textlen - menu->text_slide >= FBW - 1) {
+                        if (textlen - s_menu.text_slide >= FBW - 1) {
-                            menu->slide_end_time = tickNow;
+                            s_menu.slide_end_time = tickNow;
                         }
-                    } else if (tickNow - menu->slide_end_time >= pdMS_TO_TICKS(500)) {
+                    } else if (tickNow - s_menu.slide_end_time >= pdMS_TO_TICKS(500)) {
-                        menu->change_time = tickNow;
+                        s_menu.change_time = tickNow;
-                        menu->slide_end_time = 0;
+                        s_menu.slide_end_time = 0;
-                        menu->text_slide = 0;
+                        s_menu.text_slide = 0;
                     }
                     request_paint();
                 }
@@ -53,13 +72,13 @@ void screen_menu(GuiEvent event, const char **options, menu_callback_t cb) {
             break;
 
         case GUI_EVENT_PAINT:
-            for (int i = 0; i < menu->len; i++) {
+            for (int i = 0; i < s_menu.len; i++) {
                 // is the row currently rendered the selected row?
-                const bool is_selected = menu->pos == i;
+                const bool is_selected = s_menu.pos == i;
                 const fbcolor_t color = !is_selected; // text color - black if selected, because it's inverted
-                const fbpos_t y = 27 + i * 10;
+                const fbpos_t y = 12 + offset + i * 10 ;
                 fb_rect(0, y, FBW, 10, !color);
-                fb_text(1 - (is_selected ? menu->text_slide : 0), y + 1, options[i], FONT_5X7, color);
+                fb_text(1 - (is_selected ? s_menu.text_slide : 0), y + 1, options[i], FONT_5X7, color);
                 // ensure the text doesn't touch the edge (looks ugly)
                 fb_vline(FBW - 1, y, 10, !color);
                 fb_vline(0, y, 10, !color);
@@ -69,28 +88,28 @@ void screen_menu(GuiEvent event, const char **options, menu_callback_t cb) {
             // the button is held! release is what activates the button
         case GUI_EVENT_KNOB_RELEASE:
             input_sound_effect();
-            cb(menu->pos);
+            cb(s_menu.pos);
             break;
 
         case GUI_EVENT_KNOB_PLUS:
-            if (menu->pos < menu->len - 1) {
+            if (s_menu.pos < s_menu.len - 1) {
-                menu->pos++;
+                s_menu.pos++;
                 menu_changed = true;
             }
             break;
 
         case GUI_EVENT_KNOB_MINUS:
-            if (menu->pos > 0) {
+            if (s_menu.pos > 0) {
-                menu->pos--;
+                s_menu.pos--;
                 menu_changed = true;
             }
             break;
     }
 
     if (menu_changed) {
-        menu->change_time = tickNow;
+        s_menu.change_time = tickNow;
-        menu->text_slide = 0;
+        s_menu.text_slide = 0;
-        menu->slide_end_time = 0;
+        s_menu.slide_end_time = 0;
         input_sound_effect();
         request_paint();
     }

Core/Src/Gui/screen_menu.h

@@ -8,6 +8,7 @@
 #define TOASTER_OVEN_BLUEPILL_SCREEN_MENU_H
 
 #include "gui_event.h"
+#include "ufb/framebuffer.h"
 
 /**
  * Choice callback for the generic menu screen. Options are indexed from zero
@@ -23,5 +24,7 @@ typedef void (*menu_callback_t)(int choice);
  */
 void screen_menu(GuiEvent event, const char **options, menu_callback_t cb);
 
+/** Menu with custom offset (default is 15) */
+void screen_menu_offset(GuiEvent event, const char **options, menu_callback_t cb, fbpos_t offset);
 
 #endif //TOASTER_OVEN_BLUEPILL_SCREEN_MENU_H

Core/Src/app_heater.c

@@ -39,12 +39,15 @@ static struct {
   float tuning_p;
   float tuning_i;
   float tuning_d;
+  /// Manual PWM override (percent, -1 = override disable)
+  int manual_override;
   // PID state
   struct PID pid;
 } state = {
         .tuning_p = 10.0f,
         .tuning_i = 0.052f,
         .tuning_d = 100.0f,
+        .manual_override = -1,
         .pid = {
                 .SampleTimeTicks = pdMS_TO_TICKS(1000),
                 .outMax = 100.0f,
@@ -62,6 +65,19 @@ static inline void heaterExitCritical() {
     osMutexRelease(heaterMutexHandle);
 }
 
+void app_heater_manual_override(int percent) {
+    PRINTF("Set manual override: %d\r\n", percent);
+
+    heaterEnterCritical();
+    PID_SetCtlMode(&state.pid, PID_MANUAL);
+    state.manual_override = percent;
+    heaterExitCritical();
+}
+
+void app_heater_manual_override_clear() {
+    app_heater_manual_override(-1);
+}
+
 void app_heater_set_tuning(float p, float i, float d) {
     heaterEnterCritical();
     PID_SetTunings(&state.pid, p, i, d);
@@ -127,13 +143,19 @@ void app_task_heater(void *argument)
 
         heaterEnterCritical();
         app_safety_pass_reg_loop_running();
-        PID_Compute(&state.pid, state.oven_temp);
+
-        if (state.pid.ctlMode == PID_AUTOMATIC) {
+        if (state.manual_override >= 0 && state.manual_override <= 100) {
-            PRINTF("temp %d, output %d\r\n", (int) state.oven_temp, (int) state.pid.Output);
+            PRINTF("manual override %d%%\r\n", state.manual_override);
-            heater_pwm_set_perc(state.pid.Output);
+            heater_pwm_set_perc(state.manual_override);
         } else {
-            // turn it off
+            PID_Compute(&state.pid, state.oven_temp);
-            heater_pwm_set_perc(0);
+            if (state.pid.ctlMode == PID_AUTOMATIC) {
+                PRINTF("temp %d, output %d\r\n", (int) state.oven_temp, (int) state.pid.Output);
+                heater_pwm_set_perc(state.pid.Output);
+            } else {
+                // turn it off
+                heater_pwm_set_perc(0);
+            }
         }
         heaterExitCritical();
 

Core/Src/app_heater.h

@@ -14,6 +14,13 @@ extern osThreadId_t heaterTskHandle;
 
 void app_task_heater(void *argument);
 
+/// Clear manual override, disable heater for normal mode.
+void app_heater_manual_override_clear();
+
+/// Set manual override PWM 0-100%.
+/// Also disables heater in the normal mode.
+void app_heater_manual_override(int percent);
+
 /// Set heater regulator tuning.
 /// Mutex is locked internally.
 void app_heater_set_tuning(float p, float i, float d);

Core/Src/app_temp.c

@@ -26,17 +26,17 @@ const float V_REFINT = 1.23f;
 
 static struct App {
   float oven_temp;
+  float oven_temp_raw;
   float soc_temp;
-  float v_sensor;
   float cal_a;
   float cal_b;
+  float oventemp_history[OVENTEMP_HISTORY_DEPTH]; // raw temp
   uint16_t adc_averagebuf[AVERAGEBUF_DEPTH * 4];
   uint8_t averagebuf_ptr;
-  float adc_averages[4];
-  float oventemp_history[OVENTEMP_HISTORY_DEPTH];
   uint8_t oventemp_history_ptr;
 } s_analog = {
-        .cal_a = 1.0f,
+        // Ax + B = y ... X = raw sample (ratio 0-1 of 3.3), Y = corrected sample
+        .cal_a = 1.0f, // safe default calibration constants
         .cal_b = 0.0f,
 };
 
@@ -148,6 +148,35 @@ static const float TSENSE_LOOKUP[TSENSE_LOOKUP_LEN] = {
         0.219346163379138f,
 };
 
+/// if the calibration constants are zero, reset to defaults
+static void correct_invalid_calib() {
+    if (s_analog.cal_a == 0.0f || s_analog.cal_b == 0.0f) {
+        PRINTF("ADC invalid calib, reset\r\n");
+        s_analog.cal_a = 1.0f;
+        s_analog.cal_b = 0.0f;
+    }
+}
+
+/// Set and persist calibration constants
+void app_temp_set_calib(float a, float b) {
+    s_analog.cal_a = a;
+    s_analog.cal_b = b;
+    correct_invalid_calib();
+
+    EE_Status st = EE_WriteVariable32bits(EE_ADDR_CAL_A, ((x32_t) { .f = a }).u);
+    if (st == EE_CLEANUP_REQUIRED) {
+        EE_CleanUp();
+    } else if (st != EE_OK) {
+        PRINTF("EE write err %d!\r\n", st);
+    }
+    st = EE_WriteVariable32bits(EE_ADDR_CAL_B, ((x32_t) { .f = b }).u);
+    if (st == EE_CLEANUP_REQUIRED) {
+        EE_CleanUp();
+    } else if (st != EE_OK) {
+        PRINTF("EE write err %d!\r\n", st);
+    }
+}
+
 void app_analog_init()
 {
     // read calibration constants
@@ -161,11 +190,7 @@ void app_analog_init()
         PRINTF("ADC calib b read from EE: %f\r\n", s_analog.cal_b);
     }
 
-    if (s_analog.cal_a == 0.0f || s_analog.cal_b == 0.0f) {
+    correct_invalid_calib();
-        PRINTF("ADC invalid calib, reset\r\n");
-        s_analog.cal_a = 1.0f;
-        s_analog.cal_b = 0.0f;
-    }
 
     LL_ADC_Enable(ADC_TEMP);
 
@@ -192,7 +217,7 @@ void app_analog_init()
     LL_TIM_EnableCounter(TIM1);
 }
 
-static float val_to_c(float val)
+float val_to_c(float val)
 {
     // TODO use binary search.. lol
     for (int i = 1; i < TSENSE_LOOKUP_LEN; i++) {
@@ -207,6 +232,22 @@ static float val_to_c(float val)
     return TSENSE_T_MAX;
 }
 
+float c_to_val(float cf)
+{
+    int lower = (int) (cf / TSENSE_T_STEP);
+
+    if (lower < 0) {
+        lower = 0;
+    }
+    if (lower >= TSENSE_LOOKUP_LEN - 1) {
+        lower = TSENSE_LOOKUP_LEN - 2;
+    }
+    int upper = lower + 1;
+
+    float ratio = (cf - ((float)lower * TSENSE_T_STEP)) / 5.0f;
+    return TSENSE_LOOKUP[lower] + (TSENSE_LOOKUP[upper] - TSENSE_LOOKUP[lower]) * ratio;
+}
+
 void app_temp_sample()
 {
     uint32_t sums[4] = {};
@@ -224,39 +265,38 @@ void app_temp_sample()
         return;
     }
 
-    s_analog.adc_averages[0] = (float) sums[0] / count;
+    float adc_averages[4];
-    s_analog.adc_averages[1] = (float) sums[1] / count;
+
-    s_analog.adc_averages[2] = (float) sums[2] / count;
+    adc_averages[0] = (float) sums[0] / count;
-    s_analog.adc_averages[3] = (float) sums[3] / count;
+    adc_averages[1] = (float) sums[1] / count;
+    adc_averages[2] = (float) sums[2] / count;
+    adc_averages[3] = (float) sums[3] / count;
 
-    PRINTF("%f\t%f\t%f\t%f\r\n",
+//    PRINTF("%f\t%f\t%f\t%f\r\n",
-           s_analog.adc_averages[0],
+//           adc_averages[0],
-                   s_analog.adc_averages[1],
+//                   adc_averages[1],
-                   s_analog.adc_averages[2],
+//                   adc_averages[2],
-                   s_analog.adc_averages[3]
+//                   adc_averages[3]
-           );
+//           );
 
     /* r_pt100, r_ref, internal_temp, v_ref_int */
-    float refint = s_analog.adc_averages[3];
+    float refint = adc_averages[3];
     float scale = V_REFINT / refint;
 
     const float avg_slope = 4.3f * scale;
     const float v25 = 1.43f;
-    const float v_tsen = s_analog.adc_averages[2] * scale;
+    const float v_tsen = adc_averages[2] * scale;
 
     s_analog.soc_temp = (v25 - v_tsen) / avg_slope + 25.f;
-    s_analog.v_sensor = s_analog.adc_averages[0] * scale; // good for debug/tuning
+    //s_analog.v_sensor = adc_averages[0] * scale; // good for debug/tuning
 
 
     // using a voltage divider, so assuming the reference resistor is measured well,
     // we can just use the ratio and the exact voltage value is not important.
 
-    float x = s_analog.adc_averages[0] / s_analog.adc_averages[1];
+    float oventemp_sample = adc_averages[0] / adc_averages[1];
-    float y = s_analog.cal_a * x + s_analog.cal_b;
-    float actual_temp = val_to_c(y);
-    PRINTF("Compensated x %f -> y %f, temp %f C\r\n", x, y, actual_temp);
 
-    s_analog.oventemp_history[s_analog.oventemp_history_ptr] = actual_temp;
+    s_analog.oventemp_history[s_analog.oventemp_history_ptr] = oventemp_sample;
     s_analog.oventemp_history_ptr = (s_analog.oventemp_history_ptr + 1) % OVENTEMP_HISTORY_DEPTH;
 
     float sum = 0;
@@ -270,15 +310,21 @@ void app_temp_sample()
     if (depth > 0) {
         sum /= depth;
     }
-    s_analog.oven_temp = sum;
+
+    float y = s_analog.cal_a * sum + s_analog.cal_b;
+    float actual_temp = val_to_c(y);
+    PRINTF("T raw %f %f -> comp %f, temp %f°C\r\n", sum, y, actual_temp);
+
+    s_analog.oven_temp = actual_temp;
+    s_analog.oven_temp_raw = sum;
 
     app_safety_pass_temp_calculation();
 
-    if (s_analog.oven_temp >= 5.0 && s_analog.oven_temp <= 455.0) {
+    if (s_analog.oven_temp_raw >= 0.05 && s_analog.oven_temp_raw <= 0.22) {
         app_safety_pass_temp_normal();
     }
 
-    if (s_analog.soc_temp >= 5.0 && s_analog.soc_temp <= 80.0) {
+    if (s_analog.soc_temp >= 2.0 && s_analog.soc_temp <= 80.0) {
         app_safety_pass_soc_temp_ok();
     }
 }
@@ -288,6 +334,11 @@ float app_temp_read_oven()
     return s_analog.oven_temp;
 }
 
+float app_temp_read_oven_raw()
+{
+    return s_analog.oven_temp_raw;
+}
+
 float app_temp_read_soc()
 {
     return s_analog.soc_temp;

Core/Src/app_temp.h

@@ -7,6 +7,11 @@
 
 void app_analog_init();
 
+float val_to_c(float val);
+float c_to_val(float c);
+
+void app_temp_set_calib(float a, float b);
+
 /**
  * Update temperature measurement.
  *
@@ -20,6 +25,9 @@ void app_temp_sample();
 /// The value is valid after calling app_temp_sample()
 float app_temp_read_oven();
 
+/// Get the raw ADC value (divider voltage)
+float app_temp_read_oven_raw();
+
 /// Read current SOC temperature (celsius)
 /// The value is valid after calling app_temp_sample()
 float app_temp_read_soc();

Lib/snprintf/snprintf.c

@@ -655,6 +655,8 @@ static void fmtfp(char *buffer, size_t *currlen, size_t maxlen,
     int zpadlen = 0;
     int caps = 0;
     int index;
+    int fzeropad = 0;
+    int fzerocnt = 0;
     double intpart;
     double fracpart;
     double temp;
@@ -728,6 +730,13 @@ static void fmtfp(char *buffer, size_t *currlen, size_t maxlen,
 
     /* Convert fractional part */
     if (fracpart) {
+        // leading zeros in the fractional part
+        fzeropad = 0;
+        fzerocnt = max - 1;
+        while (fracpart < POW10(fzerocnt)) {
+            fzeropad++;
+            fzerocnt--;
+        }
         do {
             temp = fracpart;
             my_modf(fracpart * 0.1, &fracpart);
@@ -785,8 +794,19 @@ static void fmtfp(char *buffer, size_t *currlen, size_t maxlen,
     if (max > 0) {
         dopr_outch(buffer, currlen, maxlen, '.');
 
-        while (fplace > 0)
+        if (zpadlen > fzeropad) {
+            zpadlen -= fzeropad;
+        } else {
+            zpadlen = 0;
+        }
+
+        while (fzeropad-- > 0) {
+            dopr_outch(buffer, currlen, maxlen, '0');
+        }
+
+        while (fplace > 0) {
             dopr_outch(buffer, currlen, maxlen, fconvert[--fplace]);
+        }
     }
 
     while (zpadlen > 0) {

Lib/ufb/Src/font_57.inc.c

@@ -98,24 +98,13 @@ static const font5x_bitmap_t PROGMEM font57_ascii[] = {
 
 static const struct utf_glyph5x PROGMEM font57_extra[] = {
     {.utf={.symbol="<EFBFBD>"}, {{0x7f, 0x41, 0x41, 0x41, 0x7f}}},
-    {.utf={.symbol="×"}, {{0x22, 0x14, 0x08, 0x14, 0x22}}},
-    {.utf={.symbol="↑"}, {{0x08, 0x04, 0x3e, 0x04, 0x08}}},
-    {.utf={.symbol="↓"}, {{0x08, 0x10, 0x3e, 0x10, 0x08}}},
     {.utf={.symbol="←"}, {{0x08, 0x1c, 0x2a, 0x08, 0x08}}},
     {.utf={.symbol="→"}, {{0x08, 0x08, 0x2a, 0x1c, 0x08}}},
-    {.utf={.symbol="⏱"}, {{0x1c, 0x22, 0x2e, 0x2a, 0x1c}}},
-    {.utf={.symbol="⌛"}, {{0x63, 0x55, 0x4d, 0x55, 0x63}}},
-    {.utf={.symbol="☸"}, {{0x1c, 0x22, 0x2a, 0x22, 0x1c}}},
-    {.utf={.symbol="⏎"}, {{0x10, 0x38, 0x54, 0x10, 0x1e}}},
-    {.utf={.symbol="🌡"}, {{0x20, 0x7e, 0x79, 0x7e, 0x2a}}},
     {.utf={.symbol="°"}, {{0x00, 0x07, 0x05, 0x07, 0x00}}},
-    {.utf={.symbol="μ"}, {{0x7c, 0x20, 0x20, 0x10, 0x3c}}},
-    {.utf={.symbol="⎌"}, {{0x04, 0x4e, 0x55, 0x44, 0x38}}},
-    {.utf={.symbol="▶"}, {{0x7f, 0x3e, 0x1c, 0x08, 0x00}}},
-    {.utf={.symbol="◀"}, {{0x00, 0x08, 0x1c, 0x3e, 0x7f}}},
     {.utf={.symbol="č"}, {{0x38, 0x45, 0x46, 0x45, 0x20}}},
     {.utf={.symbol="š"}, {{0x48, 0x55, 0x56, 0x55, 0x20}}},
     {.utf={.symbol="í"}, {{0x00, 0x44, 0x7d, 0x41, 0x00}}},
     {.utf={.symbol="ž"}, {{0x44, 0x65, 0x56, 0x4d, 0x44}}},
+    {.utf={.symbol="ď"}, {{0x38, 0x44, 0x45, 0x48, 0x7f}}},
     {.utf={.symbol="»"}, {{0x22, 0x14, 0x2a, 0x14, 0x08}}},
 };

Lib/ufb/Src/fontedit_57.c

@@ -775,30 +775,30 @@ const char *font_extras[] = {
     "#   #",
     "#   #",
     "#####",
-    // Extra 1
+//    // Extra 1
-    "     ",
+//    "     ",
-    "#   #",
+//    "#   #",
-    " # # ",
+//    " # # ",
-    "  #  ",
+//    "  #  ",
-    " # # ",
+//    " # # ",
-    "#   #",
+//    "#   #",
-    "     ",
+//    "     ",
-    // Extra 2
+//    // Extra 2
-    "     ",
+//    "     ",
-    "  #  ",
+//    "  #  ",
-    " ### ",
+//    " ### ",
-    "# # #",
+//    "# # #",
-    "  #  ",
+//    "  #  ",
-    "  #  ",
+//    "  #  ",
-    "     ",
+//    "     ",
-    // Extra 3
+//    // Extra 3
-    "     ",
+//    "     ",
-    "  #  ",
+//    "  #  ",
-    "  #  ",
+//    "  #  ",
-    "# # #",
+//    "# # #",
-    " ### ",
+//    " ### ",
-    "  #  ",
+//    "  #  ",
-    "     ",
+//    "     ",
     // Extra 4
     "     ",
     "  #  ",
@@ -815,46 +815,46 @@ const char *font_extras[] = {
     "   # ",
     "  #  ",
     "     ",
-    // Extra 6
+//    // Extra 6
-    "     ",
+//    "     ",
-    " ### ",
+//    " ### ",
-    "# # #",
+//    "# # #",
-    "# ###",
+//    "# ###",
-    "#   #",
+//    "#   #",
-    " ### ",
+//    " ### ",
-    "     ",
+//    "     ",
-    // Extra 7
+//    // Extra 7
-    "#####",
+//    "#####",
-    "#   #",
+//    "#   #",
-    " ### ",
+//    " ### ",
-    "  #  ",
+//    "  #  ",
-    " # # ",
+//    " # # ",
-    "#   #",
+//    "#   #",
-    "#####",
+//    "#####",
-    // Extra 8
+//    // Extra 8
-    "     ",
+//    "     ",
-    " ### ",
+//    " ### ",
-    "#   #",
+//    "#   #",
-    "# # #",
+//    "# # #",
-    "#   #",
+//    "#   #",
-    " ### ",
+//    " ### ",
-    "     ",
+//    "     ",
-    // Extra 9
+//    // Extra 9
-    "     ",
+//    "     ",
-    "    #",
+//    "    #",
-    "  # #",
+//    "  # #",
-    " #  #",
+//    " #  #",
-    "#####",
+//    "#####",
-    " #   ",
+//    " #   ",
-    "  #  ",
+//    "  #  ",
-    // Extra 10
+//    // Extra 10
-    "  #  ",
+//    "  #  ",
-    " # ##",
+//    " # ##",
-    " # # ",
+//    " # # ",
-    " ####",
+//    " ####",
-    " ### ",
+//    " ### ",
-    "#####",
+//    "#####",
-    " ### ",
+//    " ### ",
     // Extra 11
     " ### ",
     " # # ",
@@ -863,38 +863,38 @@ const char *font_extras[] = {
     "     ",
     "     ",
     "     ",
-    // Extra 12
+//    // Extra 12
-    "     ",
+//    "     ",
-    "     ",
+//    "     ",
-    "#   #",
+//    "#   #",
-    "#   #",
+//    "#   #",
-    "#  ##",
+//    "#  ##",
-    "### #",
+//    "### #",
-    "#    ",
+//    "#    ",
-    // Extra 13
+//    // Extra 13
-    "  #  ",
+//    "  #  ",
-    " #   ",
+//    " #   ",
-    "#### ",
+//    "#### ",
-    " #  #",
+//    " #  #",
-    "  # #",
+//    "  # #",
-    "    #",
+//    "    #",
-    " ### ",
+//    " ### ",
-    // Extra 14
+//    // Extra 14
-    "#    ",
+//    "#    ",
-    "##   ",
+//    "##   ",
-    "###  ",
+//    "###  ",
-    "#### ",
+//    "#### ",
-    "###  ",
+//    "###  ",
-    "##   ",
+//    "##   ",
-    "#    ",
+//    "#    ",
-    // Extra 15
+//    // Extra 15
-    "    #",
+//    "    #",
-    "   ##",
+//    "   ##",
-    "  ###",
+//    "  ###",
-    " ####",
+//    " ####",
-    "  ###",
+//    "  ###",
-    "   ##",
+//    "   ##",
-    "    #",
+//    "    #",
     // 99 "č"
     " x x ",
     "  x  ",
@@ -927,6 +927,14 @@ const char *font_extras[] = {
     "  #  ",
     " #   ",
     "#####",
+    // 100 "d"
+    "  x #",
+    "    #",
+    " ## #",
+    "#  ##",
+    "#   #",
+    "#   #",
+    " ####",
     // »
     "     ",
     "x x  ",
@@ -939,25 +947,26 @@ const char *font_extras[] = {
 
 const char *font_extras_utf[] = {
     "<EFBFBD>",
-    "×",
+//    "×",
-    "↑",
+//    "↑",
-    "↓",
+//    "↓",
     "←",
     "→",
-    "⏱", // clock
+//    "⏱", // clock
-    "⌛",
+//    "⌛",
-    "☸",
+//    "☸",
-    "⏎",
+//    "⏎",
-    "🌡",
+//    "🌡",
     "°",
-    "μ",
+//    "μ",
-    "⎌", // back
+//    "⎌", // back
-    "▶",
+//    "▶",
-    "◀",
+//    "◀",
     "č",
     "š",
     "í",
     "ž",
+    "ď",
     "»",
 };
 

Makefile

@@ -51,6 +51,7 @@ Core/Src/Gui/app_gui.c \
 Core/Src/Gui/screen_menu.c \
 Core/Src/Gui/screen_home.c \
 Core/Src/Gui/screen_manual.c \
+Core/Src/Gui/screen_calibration.c \
 Core/Src/Gui/screen_manual_menu.c \
 Core/Src/app_temp.c \
 Core/Src/app_knob.c \