int main( int argc, char **argv )
{
    //char my_filename[] = "../bmp/admatec.bmp";
    printf("Start\n");
    if (!bcm2835_init())
    {
        printf("BCM2835 Chipsatz ist nicht bereit!");
        return 1;
    }

    // Set the output pin to Alt Fun 5, to allow PWM channel 0 to be output there
    bcm2835_gpio_fsel(RPI_GPIO_P1_12, BCM2835_GPIO_FSEL_ALT5);
    // Clock divider is set to 16.
    // 1.2MHz/1024 = 1171.875Hz
    bcm2835_pwm_set_clock(BCM2835_PWM_CLOCK_DIVIDER_16);
    bcm2835_pwm_set_mode(PWM_CHANNEL, 1, 1);
    bcm2835_pwm_set_range(PWM_CHANNEL, RANGE);
    // Vary the PWM m/s ratio between 1/RANGE and (RANGE-1)/RANGE
    // over the course of a a few seconds
    int direction = 1; // 1 is increase, -1 is decrease
    int data = 1;
    while (1)
    {
        if (data == 1)
            direction = 1;   // Switch to increasing
        else if (data == RANGE-1)
            direction = -1;  // Switch to decreasing
        data += direction;
        bcm2835_pwm_set_data(PWM_CHANNEL, data);
        printf("Set BL_PWM to %d\n", data);
        bcm2835_delay(1);
    }

    bcm2835_close();
    printf("Ende\n");
    return 0;

}