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"invert" while using uart hardware on 16f88

 
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tbsnake



Joined: 17 Jun 2004
Posts: 3

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"invert" while using uart hardware on 16f88
PostPosted: Sat Jul 03, 2004 11:41 am     Reply with quote
Hello. Does anyone know if you can use the Uart hardware on the pic16f88 inverted:

#use rs232(baud=300,parity=N,xmit=PIN_B5,rcv=PIN_B2,bits=8,INVERT)

I worry that it may bump back to software handled uart when it sees the invert.
dyeatman



Joined: 06 Sep 2003
Posts: 1912
Location: Norman, OK

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Using INVERT on hardware UART
PostPosted: Sat Jul 03, 2004 12:25 pm     Reply with quote
You cannot use INVERT with the hardware. You must use external inversion of some sort . If you reverse the normal XMIT and RECV pin designations I think it will generate a SW UART and not enable the HW one.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Jul 03, 2004 12:37 pm     Reply with quote
Quote:
If you reverse the normal XMIT and RECV pin designations I think
it will generate a SW UART and not enable the HW one.

Another way to get a soft USART on the hardware pins is to break
up the #use rs232() declaration into two statements. Then you don't
have to reverse the pins. See this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=17803
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