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RS232 Hardware Handshake

 
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soonc



Joined: 03 Dec 2013
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RS232 Hardware Handshake
PostPosted: Thu Aug 13, 2015 8:21 pm     Reply with quote

Chip 24FJ128GA306 has Hardware RTS/CTS flow control lines.

I can't see anything in the CCS #use RS232( ) that even mentions hardware flow control.

On earlier projects (PIC18) I implemented RTS/CTS in my code.

Does CCS have any functions to enable/use the built in Hardware RTS/CTS.

I some how don't think the hardware can do that automatically. I guess I'm being a little lazy and could study the data sheet some more. !

My question is:

Must I handle the UARTs built in Flow control ?

Thanks
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Fri Aug 14, 2015 12:26 am     Reply with quote

It is in #use RS232. However _only__ if you enable buffering. Look again. It is a huge section entitled 'Flow Control Options', after the section 'Serial Buffer Options'. You can specify the pins for RTS/CTS, what level to use, and control the actual timing involved (there is a misprint in the manual here, with the FLOW_CONTROL_MODE option referring to RTS, when it should refer to CTS). SIMPLEX_MODE controls RTS.

Are you sure you are using the current manual?.
soonc



Joined: 03 Dec 2013
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Thanks
PostPosted: Fri Aug 14, 2015 5:07 am     Reply with quote

Ttelmah wrote:


Are you sure you are using the current manual?.


Thanks You nailed it.

As the V5.048 IDE debugger really is not working (it is being fixed, I hope)
I moved down to the V4.124 IDE and of course the help file does not include "Flow Control Options" in the #use RS232

Thanks again.
soonc
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