162 lines
5.2 KiB
C
162 lines
5.2 KiB
C
/***************************************************************************
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* Copyright (C) 04/2011 by Olaf Rempel *
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* razzor@kopf-tisch.de *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; version 2 of the License, *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/eeprom.h>
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#include <avr/sleep.h>
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/*
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* attiny24: (no self programming, 2.7V BOD, 8MHz internal RC Osz)
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* LFUSE = 0xC2
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* HFUSE = 0xDD
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* EFUSE = 0xFF
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*
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* RC5 Input on PB2 (INT0)
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* PROGMODE Jumper (active low) on PB1
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* OUTPUT (active low) on PB0
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*/
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/* RC5 bitlength is 1778us +/-10% convert to timer0 ticks (8us) */
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#define BITWIDTH (1778 / 8)
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#define BITWIDTH_MIN (BITWIDTH - (BITWIDTH / 10))
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#define BITWIDTH_MAX (BITWIDTH + (BITWIDTH / 10))
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#define RC5_BITCNT 14
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#define RC5_CMD_MASK 0x37FF
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#define RC5_COMPLETE 0x8000
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#define PROGMODE_CHECK() (!(PINB & (1<<PINB1)))
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#define OUTPUT_ON() { PORTB &= ~(1<<PORTB0); }
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#define OUTPUT_OFF() { PORTB |= (1<<PORTB0); }
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struct ee_param {
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uint16_t rc5cmd;
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uint8_t state;
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};
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struct ee_param params;
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struct ee_param params_in_eeprom EEMEM = {
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.rc5cmd = 0x350C,
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.state = 0x00,
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};
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static uint8_t bitcnt;
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static volatile uint16_t value;
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ISR(EXT_INT0_vect)
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{
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if (bitcnt == 0)
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value = 0;
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bitcnt++;
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value = (value << 1);
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if (!(PINB & (1<<PINB2)))
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value |= 0x0001;
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/* setup sample window for next edge */
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OCR0A = TCNT0 + BITWIDTH_MIN;
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OCR0B = TCNT0 + BITWIDTH_MAX;
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/* clear and enable COMPA / COMPB */
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TIFR0 = (1<<OCF0A) | (1<<OCF0B);
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TIMSK0 |= (1<<OCIE0A) | (1<<OCIE0B);
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/* disable INT0 until COMPA hits */
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GIMSK &= ~(1<<INT0);
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}
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ISR(TIM0_COMPA_vect)
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{
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/* clear and enable INT0 */
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GIFR = (1<<INTF0);
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GIMSK |= (1<<INT0);
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}
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ISR(TIM0_COMPB_vect)
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{
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/* disable sample window */
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TIMSK0 &= ~((1<<OCIE0A) | (1<<OCIE0B));
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/* final bit received? */
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if (bitcnt >= RC5_BITCNT)
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value |= RC5_COMPLETE;
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bitcnt = 0;
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}
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int main(int argc, char *argv[])
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{
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DDRB = (1<<PORTB0);
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/* pullup on RC5IN and PROGMEM, OUTPUT is low active */
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PORTB = (1<<PORTB2) | (1<<PORTB1) | (1<<PORTB0);
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/* INT0: both edges generate interrupt */
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MCUCR = (1<<ISC00);
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GIMSK = (1<<INT0);
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/* Timer0: 8Mhz/64 */
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TCCR0B = (1<<CS01) | (1<<CS00);
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/* load configuration, restore state */
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eeprom_read_block(¶ms, ¶ms_in_eeprom, sizeof(struct ee_param));
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if (params.state) {
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OUTPUT_ON();
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} else {
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OUTPUT_OFF();
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}
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/* all interrupts can wake up */
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set_sleep_mode(SLEEP_MODE_IDLE);
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sei();
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uint16_t old_value = 0x0000;
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while (1) {
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/* wait for next interrupt */
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sleep_mode();
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if (value & RC5_COMPLETE) {
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/* PROGMODE jumper set? */
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if (PROGMODE_CHECK()) {
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params.rc5cmd = (value & RC5_CMD_MASK);
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eeprom_write_block(¶ms, ¶ms_in_eeprom, sizeof(struct ee_param));
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/* current command matches stored one */
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} else if (params.rc5cmd == (value & RC5_CMD_MASK) && value != old_value) {
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if (params.state) {
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params.state = 0;
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OUTPUT_OFF();
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} else {
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params.state = 1;
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OUTPUT_ON();
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}
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eeprom_write_block(¶ms, ¶ms_in_eeprom, sizeof(struct ee_param));
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old_value = value;
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}
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value = 0x0000;
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}
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}
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return 0;
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}
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