AVR learning air conditioner infrared remote control code

/***************************************/
/* Target: avr microcontroller ATmega8l */               
/* Crystal: 3.6864Mhz                  */
/* 2007.8.20                           */
/* Source code of a learning air conditioner infrared remote controller written by a foreigner*/
/* AT24C512 stores the time data of 2 keys, */
/* Output through the serial port during learning and transmission*/
/* Both key learning and serial port learning are possible
/*With multi-keyboard communication interface
/***************************************/


//IRD-1V20 module address write EEPROM (2)

#include 
#include 
#include 
#include  
#define SYSCLK     3686400UL
#define uchar      unsigned char
#define uint       unsigned int
#define ulint      unsigned long

#define IRD_START TCCR2=0X19
#define IRD_STOP TCCR2=0X00
/* I2C device slave address  1 A0、A1、A2--GND == 0xa0  
                             2 A0、A1、A2--VCC == 0xa6 */
/* 24c512 =65536 bytes,anykey include 　<1000 bytes     */  


#define devicecode       0x01                   	   
#define TWI_SLA_24C512   0xa0
//#define address 0x02 //Remote controller address   
//#define TWI_SLA_PCF8563  0xa2



#define MAX_ITER         200
#define TW_WRITE         0
#define TW_READ          1
// MT


#define TW_REP_START    0x10
#define TW_START        0x08
#define TW_MT_ARB_LOST  0x38
#define TW_MT_SLA_ACK   0x18
#define TW_MT_SLA_NACK  0x20
#define TW_MT_DATA_ACK  0x28
#define TW_MT_DATA_NACK 0x30
// MR

#define TW_MR_SLA_ACK   0x40
#define TW_MR_SLA_NACK  0x48
#define TW_MR_ARB_LOST  0x38
#define TW_MR_DATA_NACK 0x58
#define TW_MR_DATA_ACK  0x50

#define led_off        PORTC|=(1<= MAX_ITER) return -1;
begin:
    TWCR = (1<>8;                /* high 8 bits of addr */
        TWCR = (1<

  Since the code is too long and the length of this article is limited, the complete code of this version can be downloaded from http://www.51hei.com/ziliao/file/IRD-1V21.rar
 

  This was obtained from a foreign forum. It has been tested and the crystal oscillator uses an external 3.6864Mhz. The internal rc crystal oscillator may not be stable.