Disable uart TX pin, setup_uart(0)

[root]

I need some help.

DeviceA rx <-{ttl rs232 5V} Pic 16F688 <-> {ttl rs232 3.3V} Device GPS

I get serial data from GPS. The data gets passed on to A. After x amount of time, I need to stop sending data to A and bring the tx pin to float/low/high ?, to allow device A to go into a sleep mode. A will go to sleep as it sees no serial device connected.

setup_uart(0) works, but also disables the RX pin. I need to continue to receive data from GPS, even if A is in sleep mode.

If I use rs232 without the xmit pin specified, it leaves the xmit pin in a high state. It needs to be in a state as setup_uart(0) would have left it in. Don’t know if it is low or floating. The issue here is Device A still sees a rs232 connected and refuse to go into sleep mode.

---
//setup_uart(0); // Disables RX also, no good
#use rs232(baud=4800, rcv=pin_C5, PARITY=N, BITS=8, ERRORS); // Leaves pin_C4/xmit in high, no good

Wait for external interrupt while get data from RX;

//setup_uart(1);
#use rs232(baud=4800, xmit=pin_C4, rcv=pin_C5, PARITY=N, BITS=8, ERRORS);

Pic 16F688
CCSC compiler 4.059

Thanks

root

[Ttelmah]

[Guest]

Thanks for the quick reply. I will try the suggested tonight and give feedback later. So simple if one knows how to.