Disable RX pin

pulurumbuluruciu · Joined: 06 Nov 2013 Posts: 27

Hello forum. How can i disable RX pin ? I have found how to disable TX but not RX .. I`m trying to communicate half-duplex with a 7816 SIM CARD and my tought was to bound the RX/TX togheter and disable/enable them on the fly ..to get rid of echo. I`m running 18f14k50. Thank you very much

Ttelmah · Joined: 11 Mar 2010 Posts: 19505

setup_uart(FALSE);

Disables the UART.

setup_UART(TRUE);

Turns it back on, with the existing baud rate.

Best Wishes

pulurumbuluruciu · Joined: 06 Nov 2013 Posts: 27

hah Ttelmah , is no good to disable both TX/RX . how I am gonna transmit if i disable both ?

SherpaDoug · Joined: 07 Sep 2003 Posts: 1640 Location: Cape Cod Mass USA

Why do you need to disable the RX pin? It is a Hi-Z input that should not load the TX significantly. Just flush the RX buffer after a TX.
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asmboy · Joined: 20 Nov 2007 Posts: 2128 Location: albany ny

if you use #INT_RDA and modify the INT handler , you can use a bit flag
to prevent received chars from being added to the buffer.

simply use the standard CCS functions to read the state of the RX pin.
problem solved

pulurumbuluruciu · Joined: 06 Nov 2013 Posts: 27

Thank you all very much for your inputs. I will make some tests and hopefully chose the best solution.