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bsodmike
Joined: 05 Aug 2006
Posts: 52
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| 16F648A and 'CCS' UART on PORT RA1 |
 Posted: Sat Aug 05, 2006 5:48 am |
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Hi all,
I've so far only been able to get UART to work as hardware on RB1/RB2 @ 19200baud. If I try to use anything higher, hypertrm just doesn't show a thing. 
So right now, I want to use RA1 as a the Tx pin, so I have this in my code:
| Code: | | #use rs232(baud=19200, parity=N, bits=8, xmit=PIN_A1) |
This worked for like 2 seconds and then nothing, so I'm back to using:
| Code: | | #use rs232(baud=19200, parity=N, bits=8, xmit=PIN_B2) |
...which should automatically implement hardware UART, and works fine, but I would like to put these ports to use. Any ideas? 
Cheers,
Mike |
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jecottrell
Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ
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| Posted: Sat Aug 05, 2006 7:32 am |
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What speed are you running the processor at? That could provide a large clue. Also, does it work at slower speeds?
John |
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bsodmike
Joined: 05 Aug 2006
Posts: 52
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| Posted: Sat Aug 05, 2006 11:39 am |
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Hiya,
I gave up on hypertrm and installed SecureCRT. This is so much better and have got it running @ 19200 nicely. 16f648A @ 20Mhz btw.
Cheers, Mike |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Aug 05, 2006 12:02 pm |
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| Quote: | #use rs232(baud=19200, parity=N, bits=8, xmit=PIN_B2)
...which should automatically implement hardware UART |
It doesn't. It's creating a software UART. You must specify both
hardware pins (rcv and xmit) in the #use rs232() statement to
generate code for a hardware UART.
Example: This will create a hardware UART.
| Code: | | #use rs232(baud=19200, xmit=PIN_B2, rcv=PIN_B1, ERRORS) |
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bsodmike
Joined: 05 Aug 2006
Posts: 52
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| Posted: Sat Aug 05, 2006 12:49 pm |
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aha!, thanks for that info. [st]What's ERRORS about? (I thought I read something on this somewhere hrm)[/st], cheers, just looked it up  |
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