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MDB Protocol Transmit 9 bits RX9D & TX9D

 
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Viotronics



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MDB Protocol Transmit 9 bits RX9D & TX9D
PostPosted: Thu Feb 25, 2010 12:31 pm     Reply with quote
Hi!

I'm starting to implement the serial 9 bit MDB protocol, with a PIC18F4420 the first step is configuring the usart

Code:

#use delay(clock=4000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=9)


But I have the following question how do I clear/set the 9 bit of transmission TX9D in the TXSTA Register, and how do I read the 9 bit of reception RX9D in the RCSTA Register

For a moment I was planning to use the putc() and readc() functions but the manual says it works with 8 bits. Maybe it changes automatically when you declare the 9 bits and you could transmit a 16 bit register (it will only transmit the first 9 bits)

Thanks for your help.
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Intelligent Communication & Control Systems
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PCM programmer



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PostPosted: Thu Feb 25, 2010 12:34 pm     Reply with quote
Read the manual:
http://www.ccsinfo.com/downloads/ccs_c_manual.pdf
Look at the parameters for the #use rs232 statement:
Quote:

LONG_DATA

Makes getc() return an int16 and putc accept anint16.
This is for 9 bit data formats.


Quote:
For a moment I was planning to use the putc() and readc() functions

There is no readc().
Viotronics



Joined: 10 Oct 2009
Posts: 5
Location: Mexico

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Thanks
PostPosted: Thu Feb 25, 2010 12:57 pm     Reply with quote
Thank you very much!

The trees didn't allow me to see the Forest and sorry about the typing error readadc

Hasta la vista Amigo!
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Viotronics Inc.
Intelligent Communication & Control Systems
http://www.viotronics.com
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