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Printf not working as expected [Solved]

 
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E_Blue



Joined: 13 Apr 2011
Posts: 306

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Printf not working as expected [Solved]
PostPosted: Wed Sep 23, 2020 9:06 am     Reply with quote

I'm trying to print in a string but I see no changes after printf
What I'm doing wrong?



Code:

char IndexBufferCmdMain;
#define BufferCmdMainSize 15
char BufferCmdMain[BufferCmdMainSize][12];

#define AlarmRxBufferSize 16
char AlarmRxBuffer[AlarmRxBufferSize];//128bits
unsigned int16 EventoCid;

#define Part 0x09
#define User 0x0A

printf(BufferCmdMain[IndexBufferCmdMain][0],"%4LX A%1X A%2X\r\n",EventoCid,AlarmRxBuffer[Part],AlarmRxBuffer[User]);

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Electric Blue


Last edited by E_Blue on Wed Sep 23, 2020 1:28 pm; edited 1 time in total
PCM programmer



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Posts: 21194

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PostPosted: Wed Sep 23, 2020 9:15 am     Reply with quote

If you want to print to a buffer, you should use sprintf, not printf.
temtronic



Joined: 01 Jul 2010
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Location: Greensville,Ontario

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PostPosted: Wed Sep 23, 2020 9:24 am     Reply with quote

You need to post a real small program that comments what is expected and shows us what IS printed.

If you're trying to fill 'BufferCmdMain[IndexBufferCmdMain][0]' with 'EventoCid,AlarmRxBuffer[Part],AlarmRxBuffer[User])' data then you need to use the SPRINTF() function.
I'm thinking that's what you want to do. Look for Sprintf() in the manual, there is a small example listed.

Jay
E_Blue



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PostPosted: Wed Sep 23, 2020 9:25 am     Reply with quote

Changed
Code:
printf(BufferCmdMain[IndexBufferCmdMain][0],"%4LX A%1X A%2X\r\n",EventoCid,AlarmRxBuffer[Part],AlarmRxBuffer[User]);


to
Code:
sprintf(BufferCmdMain[IndexBufferCmdMain][0],"%4LX A%1X A%2X\r\n",EventoCid,AlarmRxBuffer[Part],AlarmRxBuffer[User]);


doesn't work

Changed to

Code:
sprintf(BufferCmdMain[IndexBufferCmdMain],"%4LX A%1X A%2X\r\n",EventoCid,AlarmRxBuffer[Part],AlarmRxBuffer[User]);

and worked ok.
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Ttelmah



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PostPosted: Wed Sep 23, 2020 11:34 am     Reply with quote

sprintf, needs to be given the address where it is to put the data.

BufferCmdMain[IndexBufferCmdMain][0]

Is not an address.

to put the data into BufferCmdMain, you would just use
BufferCmdMain. If you want to put it to an offset location in this
buffer, then you need to use &, and the index, so:

&BufferCmdMain[IndexBufferCmdMain][0]
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