communicating pic18f452 with pic16f877a

[mackrackit]

The first thing I notice is a 10 Mhz osc defined as 40 Mhz.

Second is the SERIN/SEROUT commands.

Should read something like

SEROUT PIN, BAUDE RATE,[DATA]

Looks like the BAUD RATE (MODE) is missing.

Third, you will need to have

INCLUDE "modedefs.bas

at the beginning of your program.

[Darrel Taylor]

I think the problem might be on the TX side ...

CNF=0 
serin SFVC,4,100,SR,[CNF] 'RECEIVE CONFIRMATION.

The CNF is in the "qualifier" brackets, so SERIN will wait to receive a 0 byte.
But 250 is what's being sent for confirmation, and it'll never see it.

To receive the byte into the CNF variable, it should be without the brackets.

CNF=0 
serin SFVC,4,100,SR,CNF 'RECEIVE CONFIRMATION.

Then the

IF CNF <> 250 THEN GOTO SR

should work.

[tamersoss]

Dear Taylor ....

You were right ... It works now because of you ... It's really amazing to have a freind like you ... many thanks.