Serial data problem

[The Master]

Does it matter if there is a slight delay before i start getting data from the buffer?

[The Master]

Silly question.

            if rcsta.1=1 then
                rcsta.4=0
                rcsta.4=1
            endif

Does that empty the buffer?

[mister_e]

nope that clear the overrun error. If you want to clear the buffer, you need to read RCREG 'till RCIF flag is cleared.

TempVar Var Byte
RCIF var PIR1.5

WHILE RCIF 
    TempVar = RCREG
    WEND

[The Master]

Hmm. I am running that too but only once all the data i want has been received. I dunno.

Ive uploaded the code. Sorry its so long and confusing.

[mister_e]

some pause/pauseus may screwup things here.

How do you send the data?
What's the format?
what is the expected results?

[The Master]

The PC sends chr(255) chr(chipID) chr(brightness1)... chr(brightness16)

When a 255 arrives the recpos is set to 16. That means it has to wait for an address. If the address matches the chips address then recpos is set to 0 which means 16 bytes are about to come in. It then counts up to 15 as they arrive. Once at 15 it should stop and wait.

If pauses can cause problem then that could be it. I only check for data once every half cycle. Should i check more often? I can check upto 100 times every half cycle. For testing its set to 10 incase you were wondering

[mister_e]

which PC software do it?

Are you sure it's 9600 baud and not 250,000 bauds?

So basically it's always a 1+1+16 = 18 data stream?

If so, did you tried with a HSERIN loop? just for debuggig purpose.

DataByte VAR BYTE[18]

HSERIN [STR DataByte\18]
If DataByte[0]= 255 then DoSomething