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printf help

 
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printf help
PostPosted: Mon Mar 15, 2004 8:04 pm     Reply with quote
Hello,
I have a trivial question regarding my application. I am sending 18 int8 variables through the serial port using the printf statement:
printf("%2X%2X%2X%2X%2X%2X%2X%2X%2X%2X%2X%2X%2X%2X%2X%2X%2X%2X", Tx1_L,Tx1_H,Rx1_L,Rx1_H,Tx2_L,Tx2_H,Rx2_L,
Rx2_H,CH0_L,CH0_H, CH1_L,CH1_H,CH2_L,CH2_H,CH4_L,CH4_H,CH5_L,
CH5_H,CH6_L,CH6_H); (each variable is int8)
If i see the result using hyperterminal, I see the right data, 18 bytes received. I sent the programmed PIC to a customer and he reported looking at approx 38 bytes using an digital oscilloscope. Is this possible? because even if we add the start and stop bit, we still are far from 38 bytes.
Also long back I was suggested that I use %02X instead of %2X for outputting data to avoid losing leading zero's in the output. But I did not see any such thing when I observe the o/p in the hyperterminal. Is %02X really needed? Please suggest.

Thanks.
mach
wedilo



Joined: 16 Sep 2003
Posts: 71
Location: Moers, Germany

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PostPosted: Tue Mar 16, 2004 2:02 am     Reply with quote
Hello Gast,
I think your customer is right.

For Example:

Code:
int nTemp = 0xC0;
printf("%2X", nTemp);

In this case the uart will send 1 byte for the 'C' and 1 byte for the '0'. Because you send two chars.

Code:
long lTemp = 0xC0FF;
printf("%4LX", lTemp);

In this case the uart will send 4 bytes

So you can see 18 values (int) needs 36 bytes. But I can't explain why your customer counts 38 bytes.
Is there any carridge return or line feed or other control sequence ??

Hope that help you

73 Sven
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