ih_uart0.c

Go to the documentation of this file.

/*
 * $Log: ih_uart0.c,v $
 *
 */

#include <arch/avr32.h>
#include <dev/irqreg.h>
#include <avr32/io.h>

#include <arch/avr32/ihndlr.h>

#ifndef NUT_IRQPRI_UART0
#define NUT_IRQPRI_UART0  AVR32_INTC_INT3
#endif

static int Uart0IrqCtl(int cmd, void *param);

IRQ_HANDLER sig_UART0 = {
#ifdef NUT_PERFMON
    0,                          /* Interrupt counter, ir_count. */
#endif
    NULL,                       /* Passed argument, ir_arg. */
    NULL,                       /* Handler subroutine, ir_handler. */
    Uart0IrqCtl                 /* Interrupt control, ir_ctl. */
};

SIGNAL(Uart0IrqEntry)
{
    IRQ_ENTRY();
#ifdef NUT_PERFMON
    sig_UART0.ir_count++;
#endif
    if (sig_UART0.ir_handler) {
        (sig_UART0.ir_handler) (sig_UART0.ir_arg);
    }
    IRQ_EXIT();
}

static int Uart0IrqCtl(int cmd, void *param)
{
    int rc = 0;
    unsigned int *ival = (unsigned int *) param;
    ureg_t imr = AVR32_USART0.imr;
    static ureg_t enabledIMR = 0;
    int_fast8_t enabled = imr;

    /* Disable interrupt. */
    if (enabled) {
        AVR32_USART0.idr = 0xFFFFFFFF;
        AVR32_USART0.csr;
        enabledIMR = imr;
    }

    switch (cmd) {
    case NUT_IRQCTL_INIT:
        /* Set the vector. */
        register_interrupt(Uart0IrqEntry, AVR32_USART0_IRQ, NUT_IRQPRI_UART0);

        break;
    case NUT_IRQCTL_STATUS:
        if (enabled) {
            *ival |= 1;
        } else {
            *ival &= ~1;
        }
        break;
    case NUT_IRQCTL_ENABLE:
        enabled = 1;
        if (*ival)
            imr = *ival;
        break;
    case NUT_IRQCTL_DISABLE:
        enabled = 0;
        break;
    case NUT_IRQCTL_GETPRIO:
        *ival = NUT_IRQPRI_UART0;
        break;
#ifdef NUT_PERFMON
    case NUT_IRQCTL_GETCOUNT:
        *ival = (unsigned int) sig_UART0.ir_count;
        sig_UART0.ir_count = 0;
        break;
#endif
    default:
        rc = -1;
        break;
    }

    /* Enable interrupt. */
    if (enabled) {
        AVR32_USART0.ier = enabledIMR;
        AVR32_USART0.csr;
    }
    return rc;
}