mixed alt_printf vs printf

Altera_Forum · ‎04-25-2011

Dear experts,

I am a beginner using uC/OSII with Nios II EDS 10.1 sp1.

Question:

1. Is there any thing I should concern if I use alt_printf and printf in mixed?

I found that task using alt_printf required smaller stack.

# include <stdio.h># include "sys/alt_stdio.h"

void task1(void) {

printf("hello world\n");

OSTimeDlyHMSM(0, 0, 1, 0);

}

void task2(void) {

alt_printf("hello world\n");

OSTimeDlyHMSM(0, 0, 1, 0);

}

Thank you in advance.

skw

Altera_Forum · ‎04-26-2011

I copy and paste from the Nios SW Developer's handbook:

alt_printf()
This function is similar to printf(), but supports only the %c, %s, %x, and %%
substitution strings. alt_printf() takes up substantially less code space than
printf(), regardless whether you select the lightweight device driver API.
alt_printf() occupies less than 1Kbyte with compiler optimization level -O2.

Regards

Cris

Altera_Forum · ‎05-11-2011

Cris,

Thank you.