Serial comm between two PICs

[HenrikOlsson]

Hi,
Again, saying "it doesn't work" really does not make it easy trouble shooting someone elses code from a remote location. You really need to figure out WHAT isn't working. Where is the problem, is it the sending PIC or the receiving PIC? Perhaps the communication is working just fine and it's the fact that your sending the same value all the time that's making it LOOK like it's not working? How are you determining that it's not working? What does it do?

One thing I did notice, in your previosuly posted code, is that you're using DEFINE DEBUG_XXXX on the receiving side as well. You need to use DEFINE DEBUGIN_XXXX.

Another thing I'd do is implement some sort of delay, or even handshake, so that the sending PIC sends the value ONCE each time instead of sending it over and over again as fast as it possibly can.

/Henrik.

[Charlie]

I've also found it useful to stick a PC serial port in the middle during development. Set up your PC to run a terminal program, then start with making sure the transmitter and receiver work on their own before trying them together. Divide and conquer.

[rakickv]

your sending the same value all the time that's making it LOOK like it's not working?What does it do?
/Henrik.

I am shure that the PIC1 is sending the diferent value every time becouse I have LCD out view on PIC1.I am not shure that PIC2 is resiveing the data becouse the adress of PIC2: 00 is allwayes FF.So I must get a logic analiser and see what happens on resive PORTB.1.

[EarlyBird2]

Having read the manual the serin statement has this format.

SERIN Pin,Mode,{Timeout,Label,}{[Qual...],}{Item...}

As you can see square brackets are around the Qualifier.

The statement in your code

SERIN PORTB.1,T2400,[BR]

Is therefore waiting for BR as a qualifier?

[rakickv]

SERIN Pin,Mode,{Timeout,Label,}{[Qual...],}{Item...}
The statement in your code
SERIN PORTB.1,T2400,[BR]
Is therefore waiting for BR as a qualifier?

I had never use SERIN or SEROUT or DEBUG or DEBUGIN instruction so I can't shurely tell you what' right. I need to send decimal value of GREJAC from PIC1 to BR on PIC2.Then a decimal value of BR I will compare in SELECT CASE rutine which I didn't wrote.

[Charlie]

SERIN PORTB.1,T2400,[BR] should be SERIN PORTB.1, T2400, BR

[EarlyBird2]

Are you certain Charlie? I was not sure simply because all the way through this thread everyone has used the [BR] version of the serin instruction. Just goes to show that even experts can make mistakes

[Charlie]

According to my manual, yes. (0609)
I have not tried it. I like SEROUT for transmitting, but generally find using the hardware receiver (HSERIN) easier to get going.