example how to use a ISR at a UART?

Altera_Forum · ‎05-02-2005

Can some show me code where a ISR is used?

I want to go to a ISR when i recieved a char or more from a UART.

I can not find example's.

Altera_Forum · ‎05-05-2005

Did you check the isr routine rs_interrupt in drivers/serial/NIOSserial.c?

/*
 * This is the serial driver&#39;s generic interrupt routine
 */
irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
    struct NIOS_serial * info = (struct NIOS_serial *) dev_id;
    np_uart *    uart= (np_uart *)(info->port);
    unsigned short stat = uart->np_uartstatus;
    uart->np_uartstatus = 0;  /* clear any error status */
    if (stat & np_uartstatus_rrdy_mask) receive_chars(info, regs, stat);
    if (stat & np_uartstatus_trdy_mask) transmit_chars(info);
    return IRQ_HANDLED;
}