alt_printf() not working properly

[Altera_Forum]

Hi, I have a problem with the alt_printf() function on my Altera Cyclone IV EP4CE22E22 and Nios II. I got jtaguart as stdout, I've done a simple code like this: 

# include "sys/alt_stdio.h" int main() { char a=0x44; alt_printf("A=%x;",a); while(1); return 0; }  and as a result I obtain:  A=;  without any number,  what can I do?

[Altera_Forum]

alt_printf %x is looking for an unsigned int instead of a char. I'm wondering if that is the issue? 

 Pete

[Altera_Forum]

No, the 'char' value is promoted to 'int' before being passed as an argument. 

I think alt_printf() is a cut down version, check which conversions it supports.

[Altera_Forum]

alt_printf() supports only format specifiers like %c, %s, %x, and %%. 

 You can see delailed information about it here http://www.altera.com/literature/hb/nios2/n2sw_nii5v2.pdf.

[Altera_Forum]

I recompiled the project without changing anything and now it works properly, very very strange... 

However, if I'd like to print decimal numbers how could I do with this lightweight libraries?

[Altera_Forum]

Write your own function to convert the values to decimal, it isn't hard. 

You should even be able to do it without using any divides.