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Peter F
Joined: 12 Feb 2004 Posts: 9 Location: Surrey, UK
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Problem using printf to print string variables |
Posted: Thu Mar 25, 2004 6:26 am |
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I am using
printf("%S",StringData);
where StringData is a string variable (character array with null terminator)
What I get on the RS2323 output is only the last two characters!
For instance, if I load StringData as follows:
StringData[0]=0x31; //ASCII 1
StringData[1]=0x32; //ASCII 2
StringData[2]=0x33; //ASCII 3
StringData[3]=0x34; //ASCII 4
StringData[4]=0; //null
Output is 34
If I use the form
printf("1234");
Then I get 1234 as expected.
Anyone any idea what's going on? I have checked the file registers and the string variable is correctly loaded, so why does it ignore all but the last 2 characters? ![Confused](images/smiles/icon_confused.gif) |
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PCM programmer
Joined: 06 Sep 2003 Posts: 21708
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Posted: Thu Mar 25, 2004 2:09 pm |
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The following program works fine with PCM vs. 3.184.
It displays this: 1234
Code: | #include <16F877.h>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
//======================================
void main(void)
{
char StringData[5];
StringData[0]=0x31; //ASCII 1
StringData[1]=0x32; //ASCII 2
StringData[2]=0x33; //ASCII 3
StringData[3]=0x34; //ASCII 4
StringData[4]=0; //null
printf("%S",StringData);
while(1);
} |
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Peter F
Joined: 12 Feb 2004 Posts: 9 Location: Surrey, UK
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Posted: Fri Mar 26, 2004 2:13 am |
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Thanks for that! My code is exactly the same. Only differences are that I am using PCH with the 18F452 chip. Using puts(StringData); gives the same result. I have emailed CCS to see if they can help. If I can't find a way out, I will have to write my own function to output strings. |
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BrunoC12
Joined: 25 May 2017 Posts: 4
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Same problem |
Posted: Thu May 25, 2017 8:51 pm |
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I have the same problem. The program doesn't print all of the values that i define on printf.
Code: |
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
char ID[], ST[], OR[], AK[];
void main()
{
char string[30], term[4], *ptr;
int i;
strcpy(string,"one,two,three,four");
strcpy(term,",;");
i=0;
ptr = strtok(string, term);
while(ptr!=0) {
i++;
puts(ptr);
if(i==1)ID=ptr;
if(i==2)ST=ptr;
if(i==3)OR=ptr;
if(i==4)strcpy(AK,ptr);
ptr = strtok(0, term);
}
printf("%s \n\r %s \n\r %s \n\r %s \n\r ",ID, ST, OR, AK);
} |
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Ttelmah
Joined: 11 Mar 2010 Posts: 19385
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Posted: Fri May 26, 2017 1:09 am |
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Are you just losing the last couple of characters?.
If so, not the same problem.
What is happening, is your code drops 'off the end', and the characters still waiting to be sent, then get lost.
Look at PCM_programmer's example in this thread. The 'while' at the end of the code is to prevent this happening.
You have to realise that with embedded code, there is no 'OS' sitting outside the code, waiting to handle things when you leave. The code you write is _everything_. If your code runs out the end, then there is nothing there 'left' to do jobs at this point.... |
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