59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/**
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* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stdio.h>
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#include "pico/stdlib.h"
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/// \tag::timer_example[]
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volatile bool timer_fired = false;
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int64_t alarm_callback(alarm_id_t id, void *user_data) {
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printf("Timer %d fired!\n", (int) id);
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timer_fired = true;
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// Can return a value here in us to fire in the future
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return 0;
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}
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bool repeating_timer_callback(struct repeating_timer *t) {
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printf("Repeat at %lld\n", time_us_64());
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return true;
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}
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int main() {
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stdio_init_all();
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printf("Hello Timer!\n");
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// Call alarm_callback in 2 seconds
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add_alarm_in_ms(2000, alarm_callback, NULL, false);
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// Wait for alarm callback to set timer_fired
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while (!timer_fired) {
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tight_loop_contents();
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}
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// Create a repeating timer that calls repeating_timer_callback.
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// If the delay is > 0 then this is the delay between the previous callback ending and the next starting.
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// If the delay is negative (see below) then the next call to the callback will be exactly 500ms after the
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// start of the call to the last callback
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struct repeating_timer timer;
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add_repeating_timer_ms(500, repeating_timer_callback, NULL, &timer);
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sleep_ms(3000);
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bool cancelled = cancel_repeating_timer(&timer);
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printf("cancelled... %d\n", cancelled);
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sleep_ms(2000);
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// Negative delay so means we will call repeating_timer_callback, and call it again
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// 500ms later regardless of how long the callback took to execute
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add_repeating_timer_ms(-500, repeating_timer_callback, NULL, &timer);
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sleep_ms(3000);
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cancelled = cancel_repeating_timer(&timer);
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printf("cancelled... %d\n", cancelled);
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sleep_ms(2000);
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printf("Done\n");
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return 0;
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}
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/// \end::timer_example[]
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