#include <oulib.h>

/*
  pwm example

  LEDs attached to PORTH, pins 3, 4, 5 (timer 4, channels A, B, C,
  respectively).

*/

int main(void)
{
  // Configure appropriate pins as outputs, including the LED on the
  // Arduinio board itself
  DDRB = 0x80;
  DDRH = 0x38;

  // Flash all the LEDs to show that they are connected and that the program
  //  is booting.
  PORTH ^= 0x38;
  PORTB = PORTB ^= 0x80;
  delay_ms(200);
  PORTH ^= 0x38;
  PORTB = PORTB ^= 0x80;
  delay_ms(200);
  PORTH ^= 0x38;
  PORTB = PORTB ^= 0x80;
  delay_ms(200);
  PORTH ^= 0x38;
  PORTB = PORTB ^= 0x80;
  delay_ms(200);

  // Configure timer 4 for 10-bit PWM
  timer4_config(TIMER4_PRE_8);
  timer4_output_compare_config(TIMER4_OUTPUT_COMPARE_CONFIG_PWM_F_10);

  // Configure each channel for output-compare mode
  timer4_compare_output_A_mode_set(TIMER16B_COMPARE_OUTPUT_MODE_CLEAR);
  timer4_compare_output_B_mode_set(TIMER16B_COMPARE_OUTPUT_MODE_CLEAR);
  timer4_compare_output_C_mode_set(TIMER16B_COMPARE_OUTPUT_MODE_CLEAR);

  // Set initial duty cycle on each to zero
  timer4_output_compare_A_set(0);
  timer4_output_compare_B_set(0);
  timer4_output_compare_C_set(0);

  int i;
  // Loop forever
  while(1) {

    // Slowly increase the duty cycle on channel A
    for(i=0; i < 1024; ++i) {
      timer4_output_compare_A_set(i);
      delay_ms(1);
    };

    // Slowly bring the duty cycle back to zero
    for(i=1023; i > 0; --i) {
      timer4_output_compare_A_set(i);
      delay_ms(1);
    };

    // Slowly increase the duty cycle on channel B
    for(i=0; i < 1024; ++i) {
      timer4_output_compare_B_set(i);
      delay_ms(1);
    };

    // Slowly bring the duty cycle back to zero
    for(i=1023; i > 0; --i) {
      timer4_output_compare_B_set(i);
      delay_ms(1);
    };

    // Slowly increase the duty cycle on channel C
    for(i=0; i < 1024; ++i) {
      timer4_output_compare_C_set(i);
      delay_ms(1);
    };

    // Slowly bring the duty cycle back to zero
    for(i=1023; i > 0; --i) {
      timer4_output_compare_C_set(i);
      delay_ms(1);
    };
  }

  return(0);

}