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pfournier
Joined: 30 Sep 2003
Posts: 89
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| Using fputc causes printf to stop working. |
 Posted: Wed Aug 19, 2009 10:41 am |
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This is the shortest code I could write to fully demonstrate the problem.
I use fputc() to send data out the second serial port and use printf() to send information to a diagnostics display to the first serial port.
What I find is that I can use printf() ONCE after my first fputc(), then it won't put anything out anymore.
I have an option to write directly to the transmit register of the second serial port, but I want to take advantage of the parity control that fputc() gets me.
Note that I have a:
#define USE_FPUTC
that you can use to swap between using fputc() and the direct method.
Thanks,
-Pete
Compiler version PCWH 3.249
| Code: |
#include <18F8622.h>
#use delay(clock=10000000)
#fuses HS, NOWDT, PUT, BROWNOUT, NOLVP
#fuses NOPROTECT, NOWRT, NOEBTR //needed only for my board
#use rs232(baud=312500, xmit=PIN_G1, rcv=PIN_G2, ERRORS, parity=O, bits=8, stream=SERIAL2)
#use rs232(baud=38400, xmit=PIN_C6, rcv=PIN_C7, ERRORS, parity=N, bits=8)
char txreg2;
#LOCATE txreg2 = 0xf6d
char rcsta2;
#LOCATE rcsta2 = 0xf6b
char txsta2;
#LOCATE txsta2 = 0xf6c
#use standard_io(F) //used pin_F6 for analyzer signal
#define USE_PRINTF //remark out to disable printfs
#ifdef USE_PRINTF
#define USE_PRINTF(x) x
#else
#define USE_PRINTF(x)
#endif
//======================================
void main(void)
{
output_low(PIN_F6);
delay_ms(100);
output_high(PIN_F6);
USE_PRINTF(printf("\n\rSTART\n\r");)
output_LOW(PIN_F6);
#define USE_FPUTC //remark out to write directly to the 2nd serial port
#ifdef USE_FPUTC
USE_PRINTF(printf("A\n\r");)
fputc(0x01, SERIAL2);
delay_us(30);
USE_PRINTF(printf("B\n\r");)
fputc(0x05, SERIAL2);
delay_us(30);
USE_PRINTF(printf("C\n\r");)
fputc(0x15, SERIAL2);
delay_us(30);
USE_PRINTF(printf("D\n\r");)
fputc(0x55, SERIAL2);
#else
USE_PRINTF(printf("E\n\r");)
while( !bit_test(txsta2,1))
{}
txreg2=0x01; //1 bit
delay_us(30);
USE_PRINTF(printf("F\n\r");)
while( !bit_test(txsta2,1))
{}
txreg2=0x05; //2 bits
delay_us(30);
USE_PRINTF(printf("G\n\r");)
while( !bit_test(txsta2,1))
{}
txreg2=0x15; //3 bits
delay_us(30);
USE_PRINTF(printf("H\n\r");)
while( !bit_test(txsta2,1))
{}
txreg2=0x55; //4 bits
#endif
while(1){}
}
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_________________
-Pete |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Aug 19, 2009 12:54 pm |
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You should be using fprintf with streams, not printf.
Also, you should assign a stream ID to the #use rs232() statement for
pins C6 and C7. Use fputc and fprintf with it also, with the stream ID. |
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pfournier
Joined: 30 Sep 2003
Posts: 89
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| Posted: Wed Aug 19, 2009 1:03 pm |
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So, if I understand you right, if I use streams for one UART, I am forced to use streams when accessing the other UART?
_________________
-Pete |
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asmboy
Joined: 20 Nov 2007
Posts: 2128
Location: albany ny
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| Posted: Wed Aug 19, 2009 6:14 pm |
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Whenever using RS232 on a PIC with TWO EUSART channels - always assign a stream id to EACH ( both) uarts.
At the least it is insurance against future compiler revisions breaking
what you wrote. |
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