xref: /btstack/example/led_counter.c (revision 9ec2630ce4bfd36adcb438d2e8ba6fc26890f857)

/*
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// *****************************************************************************
/* EXAMPLE_START(led_counter): Hello World: blinking LED without Bluetooth
 *
 * @text The example demonstrates how to provide a periodic timer to toggle an
 * LED and send debug messages to the console as a minimal BTstack test.
 */
// *****************************************************************************



#include <stdint.h>
#include <stdio.h>

#include "btstack_run_loop.h"
#include "btstack_defines.h"
#include "hal_led.h"

#define HEARTBEAT_PERIOD_MS 1000

static int counter = 0;
static btstack_timer_source_t heartbeat;

/* @section Periodic Timer Setup
 *
 * @text As timers in BTstack are single shot,
 * the periodic counter is implemented by re-registering the timer source in the
 * heartbeat handler callback function. Listing LEDToggler shows heartbeat handler
 * adapted to periodically toggle an LED and print number of toggles.
 */

/* LISTING_START(LEDToggler): Periodic counter */
static void heartbeat_handler(btstack_timer_source_t *ts){
    UNUSED(ts);

    // increment counter
    char lineBuffer[30];
    sprintf(lineBuffer, "BTstack counter %04u\n\r", ++counter);
    puts(lineBuffer);

    // toggle LED
    hal_led_toggle();

    // re-register timer
    btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS);
    btstack_run_loop_add_timer(&heartbeat);
}
/* LISTING_END */

/* @section Main Application Setup
 *
 * @text Listing MainConfiguration shows main application code.
 * It configures the heartbeat tier and adds it to the run loop.
 */

/* LISTING_START(MainConfiguration): Setup heartbeat timer */
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
    (void)argc;
    (void)argv;

    // set one-shot timer
    heartbeat.process = &heartbeat_handler;
    btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS);
    btstack_run_loop_add_timer(&heartbeat);

    printf("Running...\n\r");
    return 0;
}
/* LISTING_END */
/* EXAMPLE_END */