setup_uart undefined error for 16F877A

[Riddick]

Hi all,

I've run into a slight quirk that I expect is an oversight on my part.

I'm trying to set the UART to off using setup_uart(FALSE); but am getting an error when I compile.

*** Error 12 "D:\VHF Tx\_main.c" Line 247(1,11): Undefined identifier -- setup_uart

I'm using v3.230 of the compiler with MPLAB 7.40

As the title suggests, I'm using a 16F877A.

I've read in the CCS C Manual, that the function requires #use rs232, which I tried defining, still with no results.



The reason I wanted to try explicitly disabling the UART is that I have an RS485 connection using pins C5 and C6. The hardware and software setup is exactly the same as on a 16F628A design, aside from the pins used. However, with the design in question I can send a data packet via RS485 but not receive.

I tried tacking wires from C5 and C6 to D1 and D3 and I can transmit and receive data with no problem.

Lastly, this is only a prototype so I can change the pins for the final design but I am curious to know why I get the error with setup_uart


Thanks in advance for any advice.

[PCM programmer]

[Riddick]

[PCM programmer]

The hardware UART is disabled upon power-on reset. It's only enabled
if you specify the hardware UART pins with a #use rs232() statement.
You don't need that line. Delete it.

[Riddick]

Ignoring a problem doesn't fix it.

[PCM programmer]

I think what you want is some way to shut off the hardware UART,
but without using the CCS setup_uart() function.

See this thread for the disable_hardware_usart() function:
http://www.ccsinfo.com/forum/viewtopic.php?t=19737

[Riddick]

That is sort of what I was after. (I was more questioning why setup_uart generates a compile error than anything.)

I actually just threw a