sprintf with F28069

charles saperstein

trying to use sprintf with a F28069 and am seeing some strange result. Trying to format a hex values. Have an array of Uint8. Tried %02X and I am getting 2X. just tried %X and am getting some non garbage. any ideas?

over 10 years ago

0 Amit Ashara over 10 years ago

TI__Guru**** 244400 points

Hello Charles

Moving it to C2000 forum

Regards
Amit

0 Adam Haun over 10 years ago

TI__Expert 8950 points

Charles,

I was able to get this to work. Can you please post the code you're using?

0 charles saperstein over 10 years ago in reply to Adam Haun

Expert 1445 points

I was also able to get it to work. I tried setting the printf support to full from minimal. When I did that, I started to get illegal instruction ISR. I increased the stack size. I also moved the stack to a larger area in RAM. Seemed to work after that.

0 Lori Heustess over 10 years ago in reply to charles saperstein

TI__Guru* 92120 points

Glad that you have it working. C I/O takes a lot of memory unfortunately but minimal helps. There are some tips for using C I/O on this wiki page that may come in handy.

processors.wiki.ti.com/.../Tips_for_using_printf;tisearch=Search-EN

0 charles saperstein over 10 years ago in reply to Lori Heustess

Expert 1445 points

got a stack size of 0x800
heap size of 0x400

%3c doesn't work. if I use %3s, it works. how come?

#define OFP_VER "1.0"

const char responseBuff[8] = "%3c\r\n";

sprintf((char*)gu8ResponseBuffer, responseBuff, OFP_VER);

0 Adam Haun over 10 years ago in reply to charles saperstein

TI__Expert 8950 points

%c is for single characters. %s is for strings. OFP_VER is a string, so you should use %s.

0 charles saperstein over 10 years ago in reply to Adam Haun

Expert 1445 points

It seems that the width specifier did not work was my point. even if I used %c, you would think the first character would be correct but it was not.

0 Adam Haun over 10 years ago in reply to charles saperstein

TI__Expert 8950 points

You didn't give it a character. You gave it a pointer to a string. sprintf() interprets the pointer address as a character (uint16) and tries to print it, which doesn't work.

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sprintf with F28069