Issues sending and receiving data

[richard]

hard to see the red bits doing anything of value except to cause framing errors

you could add the blue bits to prevent framing errors @ startup

COMMTX            VAR        PORTA.2    MESLED            VAR        PORTB.5        'MESSAGE LED




PreAmble         CON     $A5    




'*****************************************************************************
INIT:




PORTA=000000
PORTB=000000
PORTC=000000
HIGH COMMTX
pause 10
GOTO START




'*****************************************************************************
START:




HIGH INTLED
HIGH COMMTX
PAUSE 500
LOW COMMTX
LOW INTLED




PAUSE 200




HIGH MESLED




debug PreAmble,$af,$c2,$b5,$ef,13,10




PAUSE 500
LOW MESLED




PAUSE 4000




GOTO START

if you use a viable pin on the rx unit it for debug will work , its not a way i would recommend

[PaulMaker]

Greetings everyone,

first of all, thank you so much for your help.
Will try your suggestions tonight and give feedback.

@Richard, just to explain...the red bits are there only to trigger the IOC on the receiver side so that it knows when it needs to start listening.
The reason is because the receiver PIC will do a lot of tasks and will only stop to pay attention to the RX pin when the IOC is triggered.
The IOC and RX pins are defined as the same pin to save an I/O pin on both sender and received PICs.


Best regards
Rui

[Ioannis]

If you instist on using ISR for the USART receiver, why not use the USART Interrupt directly? It will not work otherwise as Richard noted.

Test your circuit and logic of the communication first with no interrupts and then decide what to do next.

Ioannis

[PaulMaker]

Greetings Ioannis,

Yes, I know...

the problem is that, although the TX PIC 16F1508 is equipped with a EUSART module, the receiver PIC 16F1503 is not
The IOC was a workaround that i came up with to trigger the debugin command on the RX PIC.

Best regards

[amgen]

wow, no hardware usart is serious..... your 1503 has mssp interrupt..... if you can make all that work, you are very skilled indeed !

[Ioannis]

Then you have to run a fast loop and make sure you won't miss any byte.

Are you sure you cannot change that 1503?

Ioannis

[PaulMaker]

Hi guys,

sorry for the late reply...

After some testing, I decided to change my 16F1503 receiver PIC to a 16F1508 which is equipped with an USART module. It's much easier to implement this way.

Thank you all for the support!