toaster-oven-bluepill/Core/Src/app_main.c

/**
 * Main task
 */

#include <stdio.h>
#include <math.h>
#include "FreeRTOS.h"
#include "task.h"

#include "main.h"

#include "ufb/framebuffer.h"
#include "iwdg.h"
#include "app_oled.h"
#include "ufb/fb_text.h"
#include "ufb/fb_7seg.h"
#include "app_temp.h"
#include "app_knob.h"
#include "app_buzzer.h"
#include "app_heater.h"
#include "cmsis_os2.h"

static struct App {
  float oven_temp;
  int16_t set_temp;
  int16_t wheel_normed;
  uint16_t wheel;
  bool run;
} s_app = {};

static void redraw_display() {
    fb_clear();

    char tmp[100];

    sprintf(tmp, "T=%d°C", (int) s_app.oven_temp);
    fb_text(3, 3, tmp, FONT_5X7, 1);

    sprintf(tmp, "Cil=%d°C", s_app.set_temp);
    fb_text(3, 11, tmp, FONT_5X7, 1);

    sprintf(tmp, "Stav=%s", s_app.run ? "ZAP" : "VYP");
    fb_text(3, 19, tmp, FONT_5X7, 1);

    if (s_app.run) {
        fb_frame(0, 0, FBW, FBH, 2, 1);
    }

    // some funny effects to showcase responsiveness and circle drawing

    fb_circle(FBW / 2, 70, 18, 1, 1);

    for (int i = 0; i < 6; i++) {
        float x = FBW / 2;
        float y = 70;

        int ii = i;

        float angle = (float) ii * (M_PI / 3.0) - s_app.wheel_normed * (M_PI / 24);

        x = x + sinf(angle) * 10;
        y = y + cosf(angle) * 10;

        fb_circle((fbpos_t) x, (fbpos_t) y, 4, i==0?4:1, 1);
    }

    fb_text(0, s_app.wheel_normed, ":3 :3", FONT_4X5, 1);

    fb_7seg_number(
            2, FBH - 20,
            10, 16,
            2, // th
            2, // spacing
            1, // color
            s_app.wheel,
            4, // places
            2);// decimals



    fb_blit();
}

void app_task_main(void *argument)
{
    app_analog_init();
    app_buzzer_init();
    app_knob_init();

    /* Prepare the framebuffer and OLED interface */
    oled_init();
    fb_clear();

    /* Infinite loop */
    bool old_pushed = app_knob_pushed();

    bool any_change = true;
    uint32_t last_redraw = osKernelGetTickCount();

    uint32_t last_blink = xTaskGetTickCount();
    for (;;) {
        // sampling is done in the heater loop

        s_app.oven_temp = app_temp_read_oven();

        uint16_t old_wheel = s_app.wheel;
        s_app.wheel = app_knob_get_raw();

        // TODO do this with interrupt and/or debouncing
        bool pushed = app_knob_pushed();
        if (pushed && !old_pushed) {
            s_app.run ^= 1;
            app_heater_enable(s_app.run);
            app_buzzer_beep();
            any_change = true;
        }
        old_pushed = pushed;


        int16_t wheel_change = (int16_t)(s_app.wheel - old_wheel);
        if (wheel_change != 0) {
            s_app.wheel_normed += wheel_change;
            if (s_app.wheel_normed < 0) {
                s_app.wheel_normed = 0;
            }
            if (s_app.wheel_normed > 500) {
                s_app.wheel_normed = 500;
            }

            int16_t old_temp = s_app.set_temp;

            s_app.set_temp = (s_app.wheel_normed / 2) * 5;

            if (old_temp != s_app.set_temp) {
                app_buzzer_beep();
                app_heater_set_target((float) s_app.set_temp);
                any_change = true;
            }
        }

        uint32_t now = osKernelGetTickCount();
        if (any_change || (now - last_redraw > pdMS_TO_TICKS(500))) {
            last_redraw = now;
            redraw_display();
            any_change = false;

            // Blink
        }

        vTaskDelay(pdMS_TO_TICKS(10));

        now = osKernelGetTickCount();
        if (now - last_blink > 250) {
            HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
            last_blink = now;
        }

        // feed dogs
        HAL_IWDG_Refresh(&hiwdg);
    }
}