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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| [SOLVED] Question about RS232_ERRORS |
 Posted: Mon Apr 18, 2011 1:14 pm |
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Hi There,
How do I know which USART is represented int RS232_ERRORS?
Can't find documentation.
Thanks,
Ron
Last edited by cerr on Mon Apr 18, 2011 3:13 pm; edited 1 time in total |
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temtronic
Joined: 01 Jul 2010
Posts: 9125
Location: Greensville,Ontario
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| Posted: Mon Apr 18, 2011 1:54 pm |
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open a project..
press F11...ccs onscreen help !
search for #use rs232
read what it says ....
"The definition of the RS232_ERRORS is as follows:
No UART:
· Bit 7 is 9th bit for 9 bit data mode (get and put).
· Bit 6 set to one indicates a put failed in float high mode.
With a UART:
· Used only by get:
· Copy of RCSTA register except:
· Bit 0 is used to indicate a parity error.
Warning:
The PIC UART will shut down on overflow (3 characters received by the hardware with a GETC() call). The "ERRORS" option prevents the shutdown by detecting the condition and resetting the UART.
"
I tend to leave the CCS onscreen help open while in all projects...saves me time loking up 'stuff' like this ! |
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Posted: Mon Apr 18, 2011 2:24 pm |
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Huh,
Thank you! So what's the best approach to determine which USART is carrying an error? It doesn't say if RS232_ERRORS is mirroring RCSTA1 or RCSTA2... The problem i'm experiencing is that I put my RS232 from the PC in BREAK (verified with oscilloscope) but the PIC doesn't see it. My code:
| Code: | | if (bit_test (RS232_ERRORS, 2)&& ! input (PC_RX)) { |
This is on USART1.
Any suggestions?  |
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Posted: Mon Apr 18, 2011 3:13 pm |
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I'm now just doing it this way round:
| Code: | | if (bit_test (RCSTA1, 2)&& ! input (PC_RX)) { |
Where RCSTA1 is
| Code: | | #byte RCSTA1 = getenv("sfr:RCSTA1") |
That seems to work fine for me.
Thanks,
Ron |
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