SPRINTF help??

lpcware · ‎06-15-2016

Content originally posted in LPCWare by deBoogle on Mon Aug 20 13:06:19 MST 2012
Hi guys,

I know there are a few threads on here regarding the sprintf function, but I'm not sure I am getting it!

I want to convert an integer to a string and i seem to remember using sprintf or snprintf to do this so... I include stdio.h
and then as a test:

uint8_t i = 50;
char buffer [20];

sprintf(buffer, "%d", i);

but i get the following error:

make: *** [TEST1.axf] Error 1

I now its probably a schoolboy error, but any help would be appreciated!

BTW, at the moment I am trying to avoid using the printf to UART mod, for two reasons 1) simplifying porting to other devices and 2) i may eventually want to use floats and I read that may not be possible with the printf to uart mod.

thanks in advance.

deBoogle

lpcware · ‎06-15-2016

Content originally posted in LPCWare by deBoogle on Wed Aug 22 06:48:01 MST 2012
I didnt see the sticky thread, but i will go hunting.

much appreciate all your input guys.

deBoogle

lpcware · ‎06-15-2016

Content originally posted in LPCWare by whitecoe on Tue Aug 21 12:38:27 MST 2012
Did you try doing a search using the sticky post at the top of the forum?

Using this you'll see that Code Red have an FAQ on Undefined References that covers this specific error.

HTH!

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Ex-Zero on Tue Aug 21 12:35:20 MST 2012
That's a semihosting problem :)

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0471c/Bacbhcee.html

lpcware · ‎06-15-2016

Content originally posted in LPCWare by deBoogle on Tue Aug 21 12:07:28 MST 2012
Hi Frame, Zero,

Yes indeed.

fseek.c:(.text.fseek+0x1c): undefined reference to `__sys_istty'
fseek.c:(.text.fseek+0x3e): undefined reference to `__sys_flen'
collect2: ld returned 1 exit status
make: *** [TEST1.axf] Error 1

i have no idea what this means. I can only guess I am missing an include (although stdio and stdlib have been included).

lpcware · ‎06-15-2016

Content originally posted in LPCWare by frame on Tue Aug 21 00:53:07 MST 2012

Quote:
OMG :eek:, a non-standard C library function :eek:

If memory serves me well, itoa ist (most) often implemented as macro, so it's not even a function...

Quote:
So sprintf is huge and itoa non standard; last option: write your own little integer to string function and add it to your standard library :rolleyes:

That is true, and should be quite simple.

But back to the start:

Quote:
make: *** [TEST1.axf] Error 1

That can't be all of the error message. Was it an "undefined reference" ?

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Ex-Zero on Mon Aug 20 14:47:01 MST 2012

Quote: deBoogle
I was always warned away from itoa due to it being non-standard C.

OMG :eek:, a non-standard C library function :eek:

So sprintf is huge and itoa non standard; last option: write your own little integer to string function and add it to your standard library :rolleyes:

lpcware · ‎06-15-2016

Content originally posted in LPCWare by deBoogle on Mon Aug 20 14:20:31 MST 2012
I was always warned away from itoa due to it being non-standard C.

but thank you for your help.

deBoogle

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Ex-Zero on Mon Aug 20 13:37:59 MST 2012

Quote:

I want to convert an integer to a string...

So itoa :confused:

Anyway, did you read this?

http://support.code-red-tech.com/CodeRedWiki/redlib_itoa

Sample: http://knowledgebase.nxp.com/showthread.php?t=3263

BTW: Your problem is no the syntax :eek:

Although I prefer

sprintf(&buffer[0], "%d", i);

to show the pointer to the array

sprintf(buffer, "%d", i);

is working also