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initial version

master
Olaf Rempel 8 years ago
commit
ae7bcc5136
3 changed files with 222 additions and 0 deletions
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      .gitignore
  2. +62
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      Makefile
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      main.c

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.gitignore View File

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build

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Makefile View File

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TARGET = rc5switch
TARGET_MCU = attiny24

# ---------------------------------------------------------

BUILD = build

CC = avr-gcc
NM = avr-nm
SIZE = avr-size
OBJCOPY = avr-objcopy
OBJDUMP = avr-objdump

override CFLAGS = -g -Wall -Os -mmcu=$(TARGET_MCU) -Wa,-gstabs,-adhlns=$(BUILD)/$(*D)/$(*F).lst -MMD -MP -MF $(BUILD)/$(*D)/$(*F).d -pipe
override LDFLAGS = -Wl,-Map=$(BUILD)/$(TARGET).map,--cref

# ---------------------------------------------------------

SRC := $(wildcard *.c)

all: $(addprefix $(BUILD)/$(TARGET), .elf .lss .sym .bin .hex _eeprom.bin _eeprom.hex)
# @$(SIZE) -x -C --mcu=$(TARGET_MCU) $<

%.lss: %.elf
@$(OBJDUMP) -h -S -C $< > $@

%.sym: %.elf
@$(NM) -n $< > $@

%.bin: %.elf
@$(OBJCOPY) -j .text -j .data -O binary $< $@

%.hex: %.elf
@$(OBJCOPY) -j .text -j .data -O ihex $< $@

%_eeprom.bin: %.elf
@$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O binary $< $@ 2> /dev/null

%_eeprom.hex: %.elf
@$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@ 2> /dev/null

$(BUILD)/$(TARGET).elf: $(patsubst %,$(BUILD)/%,$(SRC:.c=.o))
@echo " Linking file: $@"
@$(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS) > /dev/null
@$(SIZE) -x -B $^ $@

$(BUILD)/%.o: %.c $(MAKEFILE_LIST)
@echo " Building file: $<"
@$(shell mkdir -p $(BUILD)/$(*D))
@$(CC) -c $(CFLAGS) $< -o $@

clean:
rm -rf $(BUILD)

install: $(BUILD)/$(TARGET).hex $(BUILD)/$(TARGET)_eeprom.hex
avrdude -c dragon_isp -P usb -p t24 -U flash:w:$(BUILD)/$(TARGET).hex -U eeprom:w:$(BUILD)/$(TARGET)_eeprom.hex

# no self programming, 2.7V BOD, 8MHz internal RC Osz.
fuses:
avrdude -c dragon_isp -P usb -p t24 -U lfuse:w:0xc2:m -U hfuse:w:0xdd:m -U efuse:w:0xff:m

-include $(shell find $(BUILD) -name *.d 2> /dev/null)

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main.c View File

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/***************************************************************************
* Copyright (C) 04/2011 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License, *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/eeprom.h>
#include <avr/sleep.h>

/*
* attiny24: (no self programming, 2.7V BOD, 8MHz internal RC Osz)
* LFUSE = 0xC2
* HFUSE = 0xDD
* EFUSE = 0xFF
*
* RC5 Input on PB2 (INT0)
* PROGMODE Jumper (active low) on PB1
* OUTPUT (active low) on PB0
*/

/* RC5 bitlength is 1778us +/-10% convert to time0 ticks (8us) */
#define BITWIDTH (1778 / 8)
#define BITWIDTH_MIN (BITWIDTH - (BITWIDTH / 10))
#define BITWIDTH_MAX (BITWIDTH + (BITWIDTH / 10))

#define RC5_BITCNT 14
#define RC5_CMD_MASK 0x37FF
#define RC5_COMPLETE 0x8000

#define PROGMODE_CHECK() (!(PINB & (1<<PINB1)))
#define OUTPUT_ON() { PORTA &= ~(1<<PORTA0); }
#define OUTPUT_OFF() { PORTA |= (1<<PORTA0); }

struct ee_param {
uint16_t rc5cmd;
uint8_t state;
};

struct ee_param params;
struct ee_param params_in_eeprom EEMEM = {
.rc5cmd = 0x350C,
.state = 0x00,
};

static uint8_t bitcnt;
static volatile uint16_t value;

ISR(EXT_INT0_vect)
{
if (bitcnt == 0)
value = 0;

bitcnt++;

value = (value << 1);
if (!(PINB & (1<<PINB2)))
value |= 0x0001;

/* setup sample window for next edge */
OCR0A = TCNT0 + BITWIDTH_MIN;
OCR0B = TCNT0 + BITWIDTH_MAX;

/* clear and enable COMPA / COMPB */
TIFR0 = (1<<OCF0A) | (1<<OCF0B);
TIMSK0 |= (1<<OCIE0A) | (1<<OCIE0B);

/* disable INT0 until COMPA hits */
GIMSK &= ~(1<<INT0);
}

ISR(TIM0_COMPA_vect)
{
/* clear and enable INT0 */
GIFR = (1<<INTF0);
GIMSK |= (1<<INT0);
}

ISR(TIM0_COMPB_vect)
{
/* disable sample window */
TIMSK0 &= ~((1<<OCIE0A) | (1<<OCIE0B));

/* final bit received? */
if (bitcnt >= RC5_BITCNT)
value |= RC5_COMPLETE;

bitcnt = 0;
}

int main(int argc, char *argv[])
{
/* pullup on RC5IN and PROGMEM, OUTPUT is low active */
PORTB = (1<<PORTB2) | (1<<PORTB1) | (1<<PORTB0);

/* INT0: both edges generate interrupt */
MCUCR = (1<<ISC00);
GIMSK = (1<<INT0);

/* Timer0: 8Mhz/64 */
TCCR0B = (1<<CS01) | (1<<CS00);

/* load configuration, restore state */
eeprom_read_block(&params, &params_in_eeprom, sizeof(struct ee_param));
if (params.state) {
OUTPUT_ON();
} else {
OUTPUT_OFF();
}

/* all interrupts can wake up */
set_sleep_mode(SLEEP_MODE_IDLE);
sei();

uint16_t old_value = 0x0000;

while (1) {
/* wait for next interrupt */
sleep_mode();

if (value & RC5_COMPLETE) {
/* PROGMODE jumper set? */
if (PROGMODE_CHECK()) {
params.rc5cmd = (value & RC5_CMD_MASK);
eeprom_write_block(&params, &params_in_eeprom, sizeof(struct ee_param));

/* current command matches stored one */
} else if (params.rc5cmd == (value & RC5_CMD_MASK) && value != old_value) {
if (params.state) {
params.state = 0;
OUTPUT_OFF();
} else {
params.state = 1;
OUTPUT_ON();
}

eeprom_write_block(&params, &params_in_eeprom, sizeof(struct ee_param));
old_value = value;
}

value = 0x0000;
}
}

return 0;
}

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