Makefile

all: test

test: test.o
        gcc bcm2835-1.50/src/bcm2835.o test.o -o test

test.o: test.c
        gcc -c -Ibcm2835-1.50/src/ test.c

clean:
        rm test test.o

test.c

#include <bcm2835.h>
/* libbcm2835: http://www.airspayce.com/mikem/bcm2835/ */

#define PWM_CHANNEL 0

int main(int argc, char **argv)
{
    if (!bcm2835_init())
        return 1;

    bcm2835_gpio_fsel(RPI_GPIO_P1_18, BCM2835_GPIO_FSEL_INPT);
    bcm2835_pwm_set_mode(PWM_CHANNEL, 1, 1);
    bcm2835_pwm_set_clock(1920);
    bcm2835_pwm_set_range(PWM_CHANNEL, 200);

    int angle = 0;
    if (argc > 1) {
        angle = atoi(argv[1]);
    }
    bcm2835_pwm_set_data(PWM_CHANNEL, angle);

    bcm2835_close();

    return 0;
}