Re: [avr-gcc-list] Forced Linking

[Tvrtko A. Ursulin]

On Thursday 06 March 2003 22:47, Keith Gudger wrote:

> I have some AVR interrupt routines in an archive file.  When I run the
> linker, they get left out, as nothing in my source files refers to them.
> Obviously, the linked code doesn't work.

> Any ideas?  Thanks.

There usually must be some code which initializes interrupt in question. I 
have solved that problem by putting that function in the same source file as 
the interrupt handler. In that way it is linked in if application calls the 
initialization function - which it really must do to use it.

For example here is a snippet from my serial.c:

void    serial_init(void)
{
        fifo_init((struct fifo 
*)&serial.rx_fifo,SERIAL_RX_FIFO,&serial.rx_buffer[0]);
        fifo_init((struct fifo 
*)&serial.tx_fifo,SERIAL_TX_FIFO,&serial.tx_buffer[0]);
        
        INIT_WAIT_QUEUE(serial.receive_q);
        INIT_WAIT_QUEUE(serial.transmit_q);
}

IRQ(SIG_UART_RECV)
{
        if ( serial_rx_space() )
        {
                #ifdef CONFIG_SERIAL_OPTIMIZED
                _fifo_push((struct fifo *)&serial.rx_fifo,inp(UDR));
                #else   
                fifo_push((struct fifo *)&serial.rx_fifo,inp(UDR));     
                #endif
        }

        wake_up(&serial.receive_q);
}