retarget printf to uart?

[Jesper Vestergaard]

Jesper Vestergaard wrote:
> Hi guys
>
> I have been trying to retarget the printf in newlib so i can use it on 
> a Icnova / Grasshopper avr32 board. I use the avr32 toolchain which 
> uses newlib 1.16.0.
>
> I have read on a forum that i must implement _write_r in my code so 
> that i use the uart but it doesn't work. How do i proper retarget the 
> printf?
>
> Best regards
> Jesper
>
>
Btw i'm using FreeRTOS which i guess should be treated as a standalone 
application.

Here's a snip of the code i have tried:

int putchar2(int c)
{
  return usart_putchar(&AVR32_USART1,c);
}


int _write_r(void *reent, int fd, char *ptr, size_t len)
{

    size_t i;

    for (i=0; i<len; i++)

    {

        putchar2( ptr[i]);

    }

    return len;

}


int main(void)
{
printf("testing");
}