rc_test_buttons.c

/**
 * @file rc_test_buttons.c
 * @example    rc_test_buttons
 *
 * This is a very basic test of button functionality. It simply prints to the
 * screen when a button has been pressed or released.
 **/

#include <stdio.h>
#include <signal.h>
#include <rc/button.h>
#include <rc/time.h>

static int running = 0;

static void __on_pause_press(void)
{
        printf("Pause Pressed\n");
        return;
}

static void __on_pause_release(void)
{
        printf("Pause Released\n");
        return;
}

static void __on_mode_press(void)
{
        printf("Mode Pressed\n");
        return;
}

static void __on_mode_release(void)
{
        printf("Mode Released\n");
        return;
}

// interrupt handler to catch ctrl-c
static void __signal_handler(__attribute__ ((unused)) int dummy)
{
        running=0;
        return;
}

int main()
{
        // initialize pause and mode buttons
        if(rc_button_init(RC_BTN_PIN_PAUSE, RC_BTN_POLARITY_NORM_HIGH,
                                                RC_BTN_DEBOUNCE_DEFAULT_US)){
                fprintf(stderr,"ERROR: failed to init buttons\n");
                return -1;
        }
        if(rc_button_init(RC_BTN_PIN_MODE, RC_BTN_POLARITY_NORM_HIGH,
                                                RC_BTN_DEBOUNCE_DEFAULT_US)){
                fprintf(stderr,"ERROR: failed to init buttons\n");
                return -1;
        }

        // set signal handler so the loop can exit cleanly
        signal(SIGINT, __signal_handler);
        running = 1;

        // Assign callback functions
        rc_button_set_callbacks(RC_BTN_PIN_PAUSE, __on_pause_press, __on_pause_release);
        rc_button_set_callbacks(RC_BTN_PIN_MODE, __on_mode_press, __on_mode_release);


        //toggle leds till the program state changes
        printf("Press buttons to see response\n");
        while(running)  rc_usleep(500000);

        // cleanup and exit
        rc_button_cleanup();
        return 0;
}