[En-Nut-Discussion] Error compiling the simplest program

[Tim DeBaillie]

On Wed, 7 Mar 2007, Lorenzo Verniani wrote:

> void main (void)
> {
>  printf ("Hello world!");
> }

You can't printf if you don't have a STDOUT device.  You have to register 
a device to STDOUT first.  For example:

int main(void){
    u_long baud = 115200;

    //register the serial console
    NutRegisterDevice(&DEV_UART, 0, 0);
    uart = fopen(DEV_UART_NAME, "r+");
    _ioctl(_fileno(uart), UART_SETSPEED, &baud);


    fprintf(uart, "Hello World!");
    for(;;)
 	NutThreadYield();
}

OTHER NOTES:
~ Use int main, instead of void main (Ethernut will thank you)
~ You can't let main exit, but you can let it infinite loop as above.

You can setup the serial to be the STDOUT device as well, but I don't have 
that code handy at the present.

Tim