In smart TVs and network set-top boxes (TV boxes), the most common remote control methods are infrared and Bluetooth. In recent years, Bluetooth remotes have gained increasing attention from both manufacturers and users due to their advantages such as "no need for line-of-sight," "ability to control through obstacles," and "longer range." However, many users still prefer infrared remotes, mainly because current Bluetooth remotes suffer from various issues that can disrupt daily use.
A highly detailed infrared learning remote control is designed with code stored in an AT24C64 chip. The assembly subroutine is pre-written, and during your own design, you only need to modify the IO calls. This has been verified in my project and can learn most of the commonly used infrared remote controls in the market.
This system uses the STC89C52 microcontroller, and below is the corresponding assembly code:
;**********************************
;---------------------AT24C64 CODE-------------------------
;==========================================================
ICSTART: ; I2C start
SETB SDA
NOP
NOP
NOP
NOP
SETB SCK
NOP
NOP
NOP
NOP
CLR SDA
NOP
NOP
NOP
NOP
CLR SCK
RET
ICSTOP: ; I2C stop
CLR SDA
NOP
NOP
NOP
NOP
CLR SCK
NOP
NOP
NOP
NOP
SETB SCK
NOP
NOP
NOP
NOP
SETB SDA
RET
ICACK: ; I2C acknowledge
CLR SDA
NOP
NOP
NOP
NOP
SETB SCK
NOP
NOP
NOP
NOP
CLR SCK
RET
NOACK: ; I2C no acknowledge
SETB SDA
NOP
NOP
NOP
NOP
SETB SCK
NOP
NOP
NOP
NOP
CLR SCK
RET
ICREADBIT: ; Read one bit
SETB SDA
NOP
NOP
NOP
NOP
SETB SCK
NOP
NOP
NOP
NOP
MOV C, SDA
CLR SCK
RET
ICREADACK:
MOV R7, #200
SETB SDA
NOP
NOP
NOP
NOP
SETB SCK
NOP
NOP
NOP
NOP
READACKS:
JNB SDA, ACKEND
DJNZ R7, READACKS
SETB C
CLR SCK
RET
ACKEND:
CLR C
CLR SCK
RET
ICREADBYTE: ; Read a byte
MOV R7, #8
READLOOP:
LCALL ICREADBIT
RLC A
DJNZ R7, READLOOP
MOV R7, A
RET
ICWRITEBIT: ; Write one bit
MOV SDA, C
NOP
NOP
NOP
NOP
SETB SCK
NOP
NOP
NOP
NOP
CLR SCK
RET
ICWRITEBYTE: ; Write a byte
MOV A, R7
MOV R7, #8
WRITELOOP:
RLC A
LCALL ICWRITEBIT
DJNZ R7, WRITELOOP
RET
READAT:
MOV A, R7 ; Calculate the I2C address
MOV B, #208 ; 144
MUL AB
MOV R2, B
MOV R3, A
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