reflower/main/liquid/gui.c

#include <freertos/FreeRTOS.h>
#include <freertos/task.h>

#include "nokia.h"
#include "liquid.h"
#include "drawing.h"

static void gui_thread(void *arg);

TaskHandle_t hGuiThread = NULL;

void gui_init() {
    printf("GUI init\n");
    LCD_setup();
    LCD_setContrast(57);

    int rv = xTaskCreate(gui_thread, "gui", 4096, NULL, 6, &hGuiThread);
    assert (rv == pdPASS);
}

/**
 * Notification API:
 *
 *     0b1 - knob CW
 *    0b10 - knowb CCW
 *   0b100 - button released
 *  0b1000 - button pressed
 *
 * @param arg
 */
static void __attribute__((noreturn)) gui_thread(void *arg) {
    struct Liquid *liquid = Liquid_start();

    uint32_t last_wheel_time = 0;

    uint32_t last_time = xTaskGetTickCount();
    while (1) {
        bool want_repaint = false;
        uint32_t value = 0;
        xTaskNotifyWait(0, ULONG_MAX, &value, pdMS_TO_TICKS(10));
        uint32_t time = xTaskGetTickCount();

        if (time - last_time >= pdMS_TO_TICKS(2)) {
            want_repaint |= Liquid_handleTick(liquid, time - last_time);
            last_time = time;
        }

        if (value & 0b1000) {
            want_repaint |= Liquid_handleInput(liquid, InputEvent_Button(1));
        } else if (value & 0b100) {
            want_repaint |= Liquid_handleInput(liquid, InputEvent_Button(0));
        }

        if (value & 0b11) {
            uint32_t increment = 1;
            // wheel delta changes with speed
            if (last_wheel_time != 0) {
                uint32_t ela = time - last_wheel_time;
                if (ela < pdMS_TO_TICKS(20)) {
                    increment = 25;
                } else if (ela < pdMS_TO_TICKS(35)) {
                    increment = 10;
                } else if (ela < pdMS_TO_TICKS(75)) {
                    increment = 5;
                }
            }
            last_wheel_time = time;

            if (value & 0b01) {
                want_repaint |= Liquid_handleInput(liquid, InputEvent_Wheel(increment));
            }

            if (value & 0b10) {
                want_repaint |= Liquid_handleInput(liquid, InputEvent_Wheel(-increment));
            }
        }

        if (want_repaint) {
            Liquid_paint(liquid);
        }
    }
}