irsnd-main-avr.c

   1 /*---------------------------------------------------------------------------------------------------------------------------------------------------
   2  * irsnd-main-avr.c - demo main module to test IRSND encoder on AVRs
   3  *
   4  * Copyright (c) 2010-2016 Frank Meyer - frank(at)fli4l.de
   5  *
   6  * $Id: irsnd-main-avr.c,v 1.3 2016/09/09 08:01:11 fm Exp $
   7  *
   8  * ATMEGA88 @ 8 MHz internal RC      Osc with BODLEVEL 4.3V: lfuse: 0xE2 hfuse: 0xDC efuse: 0xF9
   9  * ATMEGA88 @ 8 MHz external Crystal Osc with BODLEVEL 4.3V: lfuse: 0xFF hfuse: 0xDC efuse: 0xF9
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *---------------------------------------------------------------------------------------------------------------------------------------------------
  16  */
  17 #include "irsnd.h"
  18
  19 #ifndef F_CPU
  20 #  error F_CPU unknown
  21 #endif
  22
  23 void
  24 timer1_init (void)
  25 {
  26 #if defined (__AVR_ATtiny45__) || defined (__AVR_ATtiny85__)                // ATtiny45 / ATtiny85:
  27     OCR1C   =  (F_CPU / F_INTERRUPTS / 4) - 1;                              // compare value: 1/15000 of CPU frequency, presc = 4
  28     TCCR1   = (1 << CTC1) | (1 << CS11) | (1 << CS10);                      // switch CTC Mode on, set prescaler to 4
  29 #else                                                                       // ATmegaXX:
  30     OCR1A   =  (F_CPU / F_INTERRUPTS) - 1;                                  // compare value: 1/15000 of CPU frequency
  31     TCCR1B  = (1 << WGM12) | (1 << CS10);                                   // switch CTC Mode on, set prescaler to 1
  32 #endif
  33
  34 #ifdef TIMSK1
  35     TIMSK1  = 1 << OCIE1A;                                                  // OCIE1A: Interrupt by timer compare
  36 #else
  37     TIMSK   = 1 << OCIE1A;                                                  // OCIE1A: Interrupt by timer compare
  38 #endif
  39 }
  40
  41 #ifdef TIM1_COMPA_vect                                                      // ATtiny84
  42 #define COMPA_VECT  TIM1_COMPA_vect
  43 #else
  44 #define COMPA_VECT  TIMER1_COMPA_vect                                       // ATmega
  45 #endif
  46
  47 /*---------------------------------------------------------------------------------------------------------------------------------------------------
  48  * timer 1 compare handler, called every 1/10000 sec
  49  *---------------------------------------------------------------------------------------------------------------------------------------------------
  50  */
  51 ISR(COMPA_VECT)                                                             // Timer1 output compare A interrupt service routine, called every 1/15000 sec
  52 {
  53     (void) irsnd_ISR();                                                     // call irsnd ISR
  54     // call other timer interrupt routines here...
  55 }
  56
  57 /*---------------------------------------------------------------------------------------------------------------------------------------------------
  58  * MAIN: main routine
  59  *---------------------------------------------------------------------------------------------------------------------------------------------------
  60  */
  61 int
  62 main (void)
  63 {
  64     IRMP_DATA irmp_data;
  65
  66     irsnd_init();                                                           // initialize irsnd
  67     timer1_init();                                                          // initialize timer
  68     sei ();                                                                 // enable interrupts
  69
  70     for (;;)
  71     {
  72         irmp_data.protocol = IRMP_NEC_PROTOCOL;                             // use NEC protocol
  73         irmp_data.address  = 0x00FF;                                        // set address to 0x00FF
  74         irmp_data.command  = 0x0001;                                        // set command to 0x0001
  75         irmp_data.flags    = 0;                                             // don't repeat frame
  76
  77         irsnd_send_data (&irmp_data, TRUE);                                 // send frame, wait for completion
  78         _delay_ms (1000);
  79     }
  80 }