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pvol
Joined: 10 Oct 2008
Posts: 46
Location: GREECE
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| change pins TX/RX |
 Posted: Sat Dec 20, 2008 3:04 am |
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Hello everybody
I wonder if I could change pins of tx/rx on 18f4620.
For example:
| Code: | | #use RS232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) |
change to
| Code: | | #use RS232(baud=9600, xmit=PIN_A0, rcv=PIN_A1) |
Is it possible to do this?
Will it work? |
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vijay s
Joined: 20 Oct 2007
Posts: 17
Location: coimbatore,india
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| Posted: Sat Dec 20, 2008 4:36 am |
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To make this PIN work as UART you have to use FORCE_SW in #use rs232.
it will generate software UART routines for the specified Pin.
_________________
with regards
vijay s |
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dyeatman
Joined: 06 Sep 2003
Posts: 1933
Location: Norman, OK
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| Posted: Sat Dec 20, 2008 7:56 am |
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The hardware UART cannot be moved from C6/C7. If you change either one of those pins (or even if you swap TX and RX) in the USE RS232 command line, the compiler will automatically generate a software UART and the hardware UART will be disabled. It should not be necessary to use the FORCE_SW switch in the command line.
One word of caution. Using a sofware UART could be a problem if you are usings any non-UART interrupts. An interrupt from an ADC, for example, can interfere with a software UART and affect transmission or reception.
Last edited by dyeatman on Sat Dec 20, 2008 2:40 pm; edited 1 time in total |
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asmboy
Joined: 20 Nov 2007
Posts: 2128
Location: albany ny
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| perhaps a razor knife and rework wire is the answer |
| Posted: Sat Dec 20, 2008 9:41 am |
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if this question was generated because of a PCB layout error
the real solution is a razor knife - and some Kynar or fine teflon rework wiring to get the correct wiring to the hardware UART - the hardware uart is your friend in all circumstances - the software uart is strictly for the desperate.  |
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