[avr-gcc-list] USART - Interrupt - problem

[Onno van Eijk]

Hi,

Just recently I have started programming micro controllers. I am using
the ATMega32 on an stk500 with avr-gcc (on Debian), and I have run into
trouble I cannot solve.
I just want to use receive data by Interrupt, but I can't get it going.
See the sample code below. While running this code nothing happens. I
have tried different variations but nothing seems to help.
(Disabling the interrupt and enabling the code in the main.while loop
does work; so the serial USART + Connection work fine)

settings
lfuse:  0xca
hfuse:  0x59
lock:   0x3f

Any Idea's?
grz,
Onno

#include <avr/io.h>
#include <avr/signal.h>
#include <avr/interrupt.h>

SIGNAL(SIG_USART_RECV)
{
        while ( !(UCSRA & (1 << RXC) ) );
        PORTC = UDR;
}
 
 int main (void)
{
        cli();  /* Disable all interrupts */
        
        UCSRB = 0x90;           /*RXCIE on, RXEN on */
        UCSRC = 0x86;           /*8bit char, no parity, 1 stop bit */
        UBRRH = 0x00;           /*(Bautrate 19.2 kHz @ fosc=1.8432 Mhz)*/
        UBRRL = 0x05;
        
        DDRC  = 0xFF;           /* All PortC pins are outputs */
        PORTC = 0xFF;
        
        MCUCR = 0x00;   
        
        sei();  /* Enable interrupts */ 
                        
        while (1)
        {
                //while ( !(UCSRA & (1 << RXC) ) );
                //PORTC = UDR;
                
        };
}