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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

mixed alt_printf vs printf

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

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    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