1, 2, or 3 bits off on RS232

[ohbailey]

I'm using a 12F675 with the internal clock and the following:
#use RS232(baud=9600, xmit=PIN_A0, rcv=PIN_A1, bits=9, parity=N)
As a test I am running a loop that does a put('A'); followed by
sleep_ms(200). I am running this through a MAX232 and sending to
a Windows XP machine running Hyperterminal. I always receive data
the is shifted right 1, 2, or 3 bits. If I use a printf statement with a newline and return, the characters are still shifted 1,2, or 3 bits but the newline and return are sent properly. I have tried several different parts thinking the internal oscillator is the problem with the same exact results from one part to the next. Does anyone have any ideas?

Oliver Bailey
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This message was ported from CCS's old forum
Original Post ID: 144516689

[PCM programmer]

:=I'm using a 12F675 with the internal clock and the following:
:=#use RS232(baud=9600, xmit=PIN_A0, rcv=PIN_A1, bits=9, parity=N)

In the line above, change the bits to 8.

Also, make sure that Hyperterm is setup for 9600 baud,
8 bits, no parity, and no hardware flow control.

I don't know how accurate your internal clock is, in the
12F675, but at least doing the above will give it a chance
to work better.


:=As a test I am running a loop that does a put('A'); followed by
:=sleep_ms(200). I am running this through a MAX232 and sending to
:=a Windows XP machine running Hyperterminal. I always receive data
:=the is shifted right 1, 2, or 3 bits. If I use a printf statement with a newline and return, the characters are still shifted 1,2, or 3 bits but the newline and return are sent properly. I have tried several different parts thinking the internal oscillator is the problem with the same exact results from one part to the next. Does anyone have any ideas?
:=
:=Oliver Bailey
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This message was ported from CCS's old forum
Original Post ID: 144516690

[Sherpa Doug]

I would avoid Hyperterminal. It has wierd gotchas that have cost me many hours. Instead use the SIO program that came with the compiler, or try this: <a href="http://bray.velenje.cx/avr/terminal/" TARGET="_blank">http://bray.velenje.cx/avr/terminal/</a>
which is what I am currently using.

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This message was ported from CCS's old forum
Original Post ID: 144516719