hwa/atmel/avr/examples/03-7-pwm-dead-time/main.c

This example is meant to validate the porting of HWA to the Atmel AVR ATtinyX5.

Generate a complementary PWM signal with dead time using counter1.

 
/*  This file is part of the HWA project.
 *  Copyright (c) 2012,2015 Christophe Duparquet.
 *  All rights reserved. Read LICENSE.TXT for details.
 */
 
#include BOARD_H
#if !defined HW_DEVICE_ATTINYX5
#  error This example does work only with ATtinyX5s
#endif
 
#define COUNTER                 counter1        // counter1
#define CLOCK_SRC               ioclk           // ioclk | pll_32MHz | pll_64MHz
#define CLOCK_PSC               16              // power of 2 in the range 1..16384
#define PWM_HZ                  20000           // frequency of generated signals
#define COMPARE                 compare0        // compare unit
 
#define COUNT                   HW_G2(HZ,CLOCK_SRC)/CLOCK_PSC/PWM_HZ
#define HZ_ioclk                HW_SYSHZ
#define HZ_pll_32MHz            32000000
#define HZ_pll_64MHz            64000000
 
 
#if COUNT*PWM_HZ*CLOCK_PSC != HW_G2(HZ,CLOCK_SRC)
#  error "PWM_HZ can not be achieved"
#endif
 
 
int main ( )
{
  hwa( begin, reset );
 
  hwa( configure, (COUNTER,prescaler),
       clock,     CLOCK_SRC );
 
  hwa( configure, COUNTER,
       clock,     ioclk / CLOCK_PSC,
       direction, up_loop,
       bottom,    0,
       top,       compare2,
       overflow,  after_bottom );
 
  hwa( write, (COUNTER, compare2), COUNT-1 );
 
  hwa( configure, (COUNTER,COMPARE),
       output_h,  set_at_bottom_clear_after_match,
       output_l,  clear_at_bottom_set_after_match );
  
  hwa( write, (COUNTER,COMPARE), 0.5 * COUNT );
 
  hwa( configure, (COUNTER,COMPARE,dtg),
       prescaler, 4,    // 1 | 2 | 4 | 8
       delay_h,   3,    // 0..15
       delay_l,   9 );  // 0..15
 
  hwa( commit );
 
  for(;;) {}
}