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Altera_Forum's avatar
Altera_Forum
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20 years ago

example how to use a ISR at a UART?

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's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

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

/*
 * This is the serial driver'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;
}