irmp-main-avr.c

   1 /*---------------------------------------------------------------------------------------------------------------------------------------------------
   2  * irmp-main-avr.c - demo main module to test IRMP decoder on AVR
   3  *
   4  * Copyright (c) 2009-2016 Frank Meyer - frank(at)fli4l.de
   5  *
   6  * $Id: irmp-main-avr.c,v 1.2 2016/01/12 21:15:16 fm Exp $
   7  *
   8  * This demo module is runnable on AVRs
   9  *
  10  * ATMEGA88 @ 8 MHz internal RC      Osc with BODLEVEL 4.3V: lfuse: 0xE2 hfuse: 0xDC efuse: 0xF9
  11  * ATMEGA88 @ 8 MHz external Crystal Osc with BODLEVEL 4.3V: lfuse: 0xFF hfuse: 0xDC efuse: 0xF9
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *---------------------------------------------------------------------------------------------------------------------------------------------------
  18  */
  19
  20 #include "irmp.h"
  21
  22 #ifndef F_CPU
  23 #error F_CPU unknown
  24 #endif
  25
  26 static void
  27 timer1_init (void)
  28 {
  29 #if defined (__AVR_ATtiny45__) || defined (__AVR_ATtiny85__)                // ATtiny45 / ATtiny85:
  30
  31 #if F_CPU >= 16000000L
  32     OCR1C   =  (F_CPU / F_INTERRUPTS / 8) - 1;                              // compare value: 1/15000 of CPU frequency, presc = 8
  33     TCCR1   = (1 << CTC1) | (1 << CS12);                                    // switch CTC Mode on, set prescaler to 8
  34 #else
  35     OCR1C   =  (F_CPU / F_INTERRUPTS / 4) - 1;                              // compare value: 1/15000 of CPU frequency, presc = 4
  36     TCCR1   = (1 << CTC1) | (1 << CS11) | (1 << CS10);                      // switch CTC Mode on, set prescaler to 4
  37 #endif
  38
  39 #else                                                                       // ATmegaXX:
  40     OCR1A   =  (F_CPU / F_INTERRUPTS) - 1;                                  // compare value: 1/15000 of CPU frequency
  41     TCCR1B  = (1 << WGM12) | (1 << CS10);                                   // switch CTC Mode on, set prescaler to 1
  42 #endif
  43
  44 #ifdef TIMSK1
  45     TIMSK1  = 1 << OCIE1A;                                                  // OCIE1A: Interrupt by timer compare
  46 #else
  47     TIMSK   = 1 << OCIE1A;                                                  // OCIE1A: Interrupt by timer compare
  48 #endif
  49 }
  50
  51 #ifdef TIM1_COMPA_vect                                                      // ATtiny84
  52 #define COMPA_VECT  TIM1_COMPA_vect
  53 #else
  54 #define COMPA_VECT  TIMER1_COMPA_vect                                       // ATmega
  55 #endif
  56
  57 ISR(COMPA_VECT)                                                             // Timer1 output compare A interrupt service routine, called every 1/15000 sec
  58 {
  59   (void) irmp_ISR();                                                        // call irmp ISR
  60   // call other timer interrupt routines...
  61 }
  62
  63 int
  64 main (void)
  65 {
  66     IRMP_DATA   irmp_data;
  67
  68     irmp_init();                                                            // initialize IRMP
  69     timer1_init();                                                          // initialize timer1
  70
  71     sei ();                                                                 // enable interrupts
  72
  73     for (;;)
  74     {
  75         if (irmp_get_data (&irmp_data))
  76         {
  77             ;                                                               // got an IR message, do something
  78         }
  79     }
  80 }