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mdstinnett
Joined: 16 Nov 2012
Posts: 1
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| 16F876A serial read input |
 Posted: Fri Nov 16, 2012 12:58 pm |
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Below is a snippet of my rx serial code. I am sending a message to an instrument ("240_00\r\n" and getting a reply back of 240 Y which is correct response. I have the PIC txing fine but my problem is receiving this message. With below snippet I can see the first returned char of 2 but that's it. I am no expert and hope someone can point me in the right direction. Thanks.
| Code: |
#use rs232(baud=9600, parity=N, xmit=62, rcv=63, bits=8, ERRORS)
#int_rda
void serial_rx_isr()
{
rx_count++;
if(RCIF == 1 && RCIE == 1)
{
Rx_Buffer[Rx_Wr_Index] = RCREG;
Rx_Wr_Index++; // increments to next element
//CREN = 0;
//rx_count++;
//TXIE = 1; // enable transmission bit
}
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Nov 16, 2012 1:03 pm |
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| Quote: |
#use rs232(baud=9600, parity=N, xmit=62, rcv=63, bits=8, ERRORS) |
Don't do this. It makes the code unreadable and not portable between
PICs. Don't use magic numbers. Use the pin constants given in the .h
file for your PIC.
| Quote: |
if(RCIF == 1 && RCIE == 1)
{
Rx_Buffer[Rx_Wr_Index] = RCREG;
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Don't do this. If you got the #int_rda interrupt, you inherently have a
character ready. Just get it with getc().
| Quote: | I can see the first returned char of 2 but that's it.
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You didn't show enough of your receive code to make a real assessment
of the problem. Ideally you should post a short but complete program
for receiving, that shows the problem. Also post your compiler version.
By complete, I mean it has the #include, #fuses, #use delay, variables,
#define statements, main(), and is compilable.
The following issue may not apply in your case, but at least read this
thread regarding the hidden sleep instruction:
http://www.ccsinfo.com/forum/viewtopic.php?t=49318 |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19513
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| Posted: Fri Nov 16, 2012 3:08 pm |
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and, what limits the size of rxcount?. As shown it has the potential to overwrite memory...
Best Wishes |
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