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Forum Index : Microcontroller and PC projects : 300 baud but 7E2

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plasma
Guru

Joined: 08/04/2012
Location: Germany
Posts: 437

Posted: 03:51pm 20 Mar 2016

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Hi ,
ive got a industrial dcf modul which sends the data with 300 baud but 7 bit , even Parity and 2 stoppbits.

i need receiving and sending with this , what should i do. ?

gtx

TassyJim

Guru

Joined: 07/08/2011
Location: Australia
Posts: 6266

Posted: 06:03pm 20 Mar 2016

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Use 8 bit no parity.
For receiving, just mask out the parity bit for each character.
For sending, you will have to generate the parity yourself.
I am sure someone here did that a few months ago.

Jim

VK7JH
MMedit

JTR0701
Regular Member

Joined: 10/07/2013
Location: Australia
Posts: 71

Posted: 07:03pm 20 Mar 2016

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Jim agrees with Jim. Almost if mot all PICs have a 9 bit mode. So 7 for data, 8th bit even parity, 9th bit always set high for first stop bit plus standard stop bit.

Alleged even parity generator for PIC18.

swapf one_byte_cache,W, ACCESS
xorwf one_byte_cache,W, ACCESS
addlw 0x41
iorlw 0x7C
addlw 0x02
bcf one_byte_cache, 7, ACCESS
btfsc WREG,7 , ACCESS
bsf one_byte_cache, 7, ACCESS

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