#include

#include

#include

#include

int main(int argc, char **argv)

{

int pwm;

int pwm_number;

int fd;

if (argc != 3 || sscanf(argv[1], "%d", &pwm_number) != 1 || sscanf(argv[2],"%d", &pwm) != 1)

{

fprintf(stderr, "input error\n");

exit(1);

}

fd = open("/dev/iopwm", 0);

if (fd < 0)

{

perror("open device /dev/iopwm");

exit(1);

}

ioctl(fd, led_number , pwm);

close(fd);

return 0;

}