target/avr/asuro_avr_irrc5.c File Reference

AVR implementation of IR-RC5 decoding. More...

#include "asuro.h"

Go to the source code of this file.

private variables to the ISR
char	AS_ir_lastsample = 0
	last read sample
unsigned char	AS_ir_bittimer = 0
	call counter for AS_isr_irrc5()
unsigned short	AS_ir_data_tmp = 0
	RC5 bit stream.
char	AS_ir_bitcount = 0
	number of read bits
Defines
#define	AS_IR_SAMPLES_PER_BIT   8
	8 samples per bit
#define	AS_IR_SAMPLES_PER_BIT_EARLY   6
	edge not before the 6th sample
#define	AS_IR_SAMPLES_PER_BIT_LATE   10
	edge after 10 samples at the latest
#define	AS_IR_PAUSE_SAMPLES   200
	The start bit is only valid after 200 samples with unchanged edge.
#define	AS_IR_PORT   PORTD
	port D
#define	AS_IR_DDR   DDRD
	IO direction port D.
#define	AS_IR_PINR   PIND
	input port D
#define	AS_IR_PIN   PD0
	IO pin on port D.
Functions
void	AS_isr_irrc5 (void)
	Read the last IR-RC5 code received.
unsigned short	AS_Irrc5Read (void)
	Read the last RC5 code that was successfully received.
Variables
volatile unsigned short	AS_ir_data = 0
	last completely read RC5 packet

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Detailed Description

AVR implementation of IR-RC5 decoding.

Based on the c't-Bot version created by Benjamin Benz (bbe@heise.de).

Author:

Denis Martin

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; either version 2 of the License, or (at your option) any later version. 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.

Definition in file asuro_avr_irrc5.c.

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Define Documentation

#define AS_IR_PAUSE_SAMPLES   200

The start bit is only valid after 200 samples with unchanged edge. According to Benz, this should be 50x1.778ms, but since we have an 8-bit counter for the samples, we are satisfied with about the half of it. Definition at line 31 of file asuro_avr_irrc5.c. Referenced by AS_isr_irrc5().

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Function Documentation

unsigned short AS_Irrc5Read (  void   )  [inline]

Read the last RC5 code that was successfully received. This will flush the input, thus subsequent calls will return 0 or a new value. Returns: Last IR RC5 code received Definition at line 121 of file asuro_avr_irrc5.c. References AS_ir_data.

void AS_isr_irrc5 (  void   )

Read the last IR-RC5 code received. called about every 222.2us Definition at line 53 of file asuro_avr_irrc5.c. References AS_ir_bitcount, AS_ir_bittimer, AS_ir_data, AS_ir_data_tmp, AS_ir_lastsample, AS_IR_PAUSE_SAMPLES, AS_IR_SAMPLES_PER_BIT_EARLY, AS_IR_SAMPLES_PER_BIT_LATE, and AS_IRRX_SAMPLE. Referenced by SIGNAL().

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