reflower/main/gui.c

#include "gui.h"
#include "nokia.h"
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>

static void gui_thread(void *arg);

TaskHandle_t hGuiThread = NULL;

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

    LCD_setContrast(60);

    LCD_clearDisplay(0);
    LCD_setStr("Hello World", 0, 0, 1);
    LCD_updateDisplay();

    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) {
    uint32_t pos = 20;
    bool btn = 0;
#define NMAX 60
    while (1) {
        uint32_t value = 0;
        xTaskNotifyWait(0, ULONG_MAX, &value, portMAX_DELAY);
//        printf("Knob event 0x%02x  ", value);

        if (value & 0b1000) {
//            printf("PUSH ");
            btn = 1;
        } else if (value & 0b100) {
            btn = 0;
        }

        if (value & 0b01) {
//            printf("FWD  ");
            if (pos == NMAX) {
                pos = 0;
            }
            else {
                pos += 1;
            }
        }

        if (value & 0b10) {
//            printf("BACK ");
            if (pos == 0) {
                pos = NMAX;
            }
            else {
                pos--;
            }
        }

        LCD_setRect(0, 15, 83, 35, 1, 1);
        char buf[10];
        sprintf(buf, "%3d %s", pos, btn?"BTN":"");
        LCD_setStr(buf, 2, 17, 0);
        LCD_updateDisplay();

//        printf(">");
//        for (int i=0; i<pos; i++) {
//            printf(" ");
//        }
//        printf("#");
//        for (int i=pos; i<NMAX; i++) {
//            printf(" ");
//        }
//        printf("<\n");
    }
}