help in RC5 remote decoder in 8051

[kelvinmanoj]

hello friends.
im trying to make a ir remote controle for some operations. i just want to enable and disable port pins while pressing the button in remote.
im using rc5 protocol. it is transmitting 14 bits. i dont know how to decode that in 8051. pls help me out with this. should i have to give the received bits in timer interupt or in external intrupt pin. im totally confused with this. i need program in embedded c for RC5 protocol and also circuit diagram.
thankyou...

 

[Dusko]

Do you have any documentation which you can share with us?

How I understand you, you have problem and with receving algorithm. Put here some atached documents or links where somebody could read more, and help will come soon, I hope so.

 

[kelvinmanoj]

sorry friend.... i dont have any documents.... i just wanted some sample c program for interfacing RC5 remote with 8051... with that only i can start writing my program...

 

[ragav4456]

Re: embedded c code(8051) to decode IR RC5 remote control required

http://www.sunrom.com/files/1142-datasheet.pdf

http://www.codeforge.com/read/94749/rc5.c__html

 

[Dusko]

Maybe this text could help you - C code for RC5 decoder 8051

Here is the code - **broken link removed**

 

[kelvinmanoj]

thankyou so much... i have some doubt in this... what is that SM5964.h file, is it for keil compiler??

Maybe this text could help you - C code for RC5 decoder 8051

Here is the code - **broken link removed**

 

[Dusko]

SM5964 is microcontroller. If you like, you can see datasheet of this microcontroller on this web page

I do not know for which compiler it is. But, how you can see datasheet of microcontroller is hosted on keil.com so, you are probably right. I suppose, you could use code like example, and write some similar code in compiler which you use.

 

[kelvinmanoj]

i need a coding for at89s52...

 

[kelvinmanoj]

Re: embedded c code(8051) to decode IR RC5 remote control required

i need a program for at89s52 controller..

http://www.sunrom.com/files/1142-datasheet.pdf

http://www.codeforge.com/read/94749/rc5.c__html

 

[Dusko]

Which compiler or editor you use? Do you have some development board, or you will develop your own schematic?

 

[kelvinmanoj]

im using keil compiler, and at89s52 controller... i dont have any schematic im just connecting tsop out to external interupt.. but i dont know how to get a 14 bits from rc remote and store it in controller..

 

[sahu]

i have need it with pic muc (pic16f72/676 ) . it may posibol ? any body help me.

- - - Updated - - -

i have need it with pic muc (pic16f72/676 ) . it may posibol ? any body help me.

 

[Tahmid]

If you search on Google, you will get loads of such projects. Here's one I found: https://www.8051projects.info/proj.asp?ID=43

You should understand the protocol. You can get the required information on the RC5 protocol here: https://www.sbprojects.com/knowledge/ir/rc5.php

Hope this helps.
Tahmid.

 

[ragav4456]

see the attachment

http://educypedia.karadimov.info/electronics/televisionrc5.htm

- - - Updated - - -

see the attachment

http://www.sbprojects.com/knowledge/ir/rc5.php

 

[ashwinguru]

Please visit https://lintags.blogspot.in/p/embedded-c.html
Thanks
Ashwin Guru

 

[sivakrishna8055]

I am tried one code
But from this am not getting the output plz suggest me where I done fault
Am using hs0038 ir receiver

#include<reg51.h>
#define TF0_VECTOR 1
#define IE1_VECTOR 2

#define UINT8 unsigned char
#define UINT16 unsigned int
#define UINT32 unsigned long
#define _TOGGLE 0x80
#define _FIELD 0x40
#define _START 0x20
sbit Data = P3^3;
sbit relay = P0^1;
sbit relay1 = P0^2;
#define RELOAD 421
#define FIRST_RELOAD 421
#define High(value) (value & 0xff)
#define Low(value) ((value>>8) & 0xFF)


typedef struct _BYTE
{
UINT8 b0;
UINT8 b1;
UINT8 b2;
UINT8 b3;
}BYTES;

typedef union _LONGINT
{
UINT32 l;
BYTES b;
}LONGUNION;

bit bRC5valid;
bit blevel;
UINT8 command, subaddress, slopecount;
LONGUNION shiftreg;

void RC5start(void) interrupt IE1_VECTOR
{
EX1=0;
slopecount=26;
TH0=High(RELOAD);
TL0=Low(RELOAD);
TR0=1;
TF0=0;
ET0=1;
}

void Timing(void) interrupt TF0_VECTOR
{

blevel=Data;
while(slopecount)
{
TR0=0;
TH0=High(FIRST_RELOAD);
TL0=Low(FIRST_RELOAD);
TR0=1;
if(blevel)
{
shiftreg.b.b0 = shiftreg.b.b0 | 1;
}
shiftreg.l = shiftreg.l <<1;
slopecount --;
return;
}
TR0=0;
ET0=0;
bRC5valid=1;
}

bit DecodeRC5Code(void)
{
UINT8 i,b;
command=0;
subaddress=0;
shiftreg.l = shiftreg.l >>1;
for(i=0;i<6;i++)
{
b=shiftreg.b.b0 & 0x03;
if(b==0x02)
{
command = command | 0x40;
}
else if(b==0x01)
{
command = command & ~0x40;
}
else
return 0;
command = command >> 1;
shiftreg.l = shiftreg.l >>2;
}

for(i=0;i<5;i++)
{
b=shiftreg.b.b0 & 0x03;
if(b == 0x02)
{
subaddress = subaddress | 0x20;
}
else if(b == 0x01)
{
subaddress = subaddress & ~0x20;
}
else
return 0;

shiftreg.l = shiftreg.l >> 2;
}

b=shiftreg.b.b0 & 0x03;
if(b == 0x02)
{
command = command | _TOGGLE;
}
else if(b == 0x01)
{
command = command & ~_TOGGLE;
}
else
return 0;
shiftreg.l = shiftreg.l >>2;
b=shiftreg.b.b0 & 0x03;
if(b == 0x02)
{
command = command | _FIELD;
}
else if(b == 0x01)
{
command = command & ~_FIELD;
}
else
return 0;
shiftreg.l = shiftreg.l >> 2;
b=shiftreg.b.b0 & 0x03;
if(b == 0x02)
{
subaddress = subaddress | _START;
}
else if(b == 0x01)
{
subaddress = subaddress & ~_START;
}
else
return 0;


return 1;
}

void InitEX1(void)
{
EX1=1;
ET0=1;
// IE1=0;
}

void InitTimer(void)
{
TMOD = 0x11;
}

void main()
{


InitTimer();
InitEX1();
shiftreg.l = 0x02;
EA=1;



while(1)
{
if(bRC5valid)
{
bRC5valid=0;
if(DecodeRC5Code())
{
if(command == 0x13)
{
relay=~relay;
}
else if (command == 0x98)
{
relay1 = ~relay1;
}
}
}
shiftreg.l = 0x02;
EA=1;
}

}