RS232 Parity problems

stma · Joined: 16 Feb 2004 Posts: 26

Using compiler version 3.181
I declare my RS232 as

Humberto · Posted: Fri Nov 03, 2006 7:46 am

Do not exist any relation between the parity, the complexity that a program
can be and data corruption, but if to add more functionalities means to enable
some timers, that could be the problem of receiving corrupted data.
Work around, try disabling global interrupt when your code get or put a char to
prevent data corruption.

Humberto

Guest · Posted: Fri Nov 03, 2006 8:46 am

Thanks Humberto.
Had thought about that before I tried changing the Parity setting.
I have no timers running at all in the program. Most of the time it is asleep and woken up on interrupt to check a port then write some data to an eeprom.
BUT the code added is not even called upon when the RS232 data is written to the screen.
Still confused. Why would this cause a problem that can be solved by using a parity setting to display the RS232 data?
Thanks
Steve

Humberto · Posted: Sat Nov 04, 2006 12:16 am

Just some comments:

1) Are you using the Parity for any kind of checking or error detection in your communications ?
2) Are you really using the nineth bit for addressing or something else?

If not, did you try using:

Guest · Posted: Tue Nov 07, 2006 4:48 am

Thanks again Humberto. Great advice.
Changed to bits=8 and all fine.
Kicking myself that I didn't spot that.
Cheers
Steve