57 lines
1.0 KiB
C++
57 lines
1.0 KiB
C++
#ifndef GAME_TIMER_HPP
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#define GAME_TIMER_HPP
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#include "freertos/FreeRTOS.h"
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#include "sseg.hpp"
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static bool playing;
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static uint32_t time_left;
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static void game_timer_task(void *arg);
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uint32_t sat_sub(uint32_t x, uint32_t y);
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void start_timer(void) {
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playing = true;
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}
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void stop_timer(void) {
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playing = false;
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}
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void init_game_timer(void) {
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xTaskCreate(game_timer_task, "game_timer", 4096, NULL, 10, NULL);
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}
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void set_game_time(uint32_t new_time) {
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time_left = new_time;
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}
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uint32_t get_game_time() {
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return time_left;
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}
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static void game_timer_task(void *arg)
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{
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TickType_t lastWakeTime = xTaskGetTickCount();
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const uint32_t frequency = 100;
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while (1) {
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vTaskDelayUntil( &lastWakeTime, pdMS_TO_TICKS(frequency));
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if (playing) {
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time_left = sat_sub(time_left, frequency);
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set_game_timer(time_left / 100, 1);
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}
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}
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vTaskDelete(NULL);
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}
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uint32_t sat_sub(uint32_t x, uint32_t y)
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{
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uint32_t res = x - y;
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res &= -(res <= x);
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return res;
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}
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#endif /* GAME_TIMER_HPP */ |