PWM.c

int32_t n = 0;
	int32_t duty = 99;
	int32_t dutyChange = -1;
	int32_t pulse = 100;

	int32_t pulse_counter = 0;
	
  while(1) {                                    /* Loop forever               */
    //btns = kb.GetKeys();                  /* Read button states         */
		btns = MyKeyboard_GetKeys();

		n += 1;
		if (n > duty) {
			//MyKeyboard_Write(1);
			LED_Off(1);
		} else {
			//MyKeyboard_Write(0);
			LED_On(1);
		}
		
		
		if (n >= pulse) {
			pulse_counter += 1;
			n = 0;
		}
		
		if (pulse_counter > 20) {
			duty += dutyChange;
			pulse_counter = 0;
		}
		
		// loop duty
		if (duty >= pulse) {
			duty = pulse - 1;
			dutyChange = -1;
		}
		
		if (duty <= 1) {
			duty = 1;
			dutyChange = 1;
		}
		
		
		Delay(1);