aic.c

This test code use PWM to control LED flashing, however, users can use PWM to do other things with t

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
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//------------------------------------------------------------------------------
//         Headers
//------------------------------------------------------------------------------

#include "aic.h"
#include <board.h>

//------------------------------------------------------------------------------
//         Global functions
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
/// Configures an interrupt in the AIC. The interrupt is identified by its
/// source (AT91C_ID_xxx) and is configured to use the specified mode and
/// interrupt handler function. Mode is the value that will be put in AIC_SMRx
/// and the function address will be set in AIC_SVRx.
/// The interrupt is disabled before configuration, so it is useless
/// to do it before calling this function. When AIC_ConfigureIT returns, the
/// interrupt will always be disabled and cleared; it must be enabled by a
/// call to AIC_EnableIT().
/// \param source  Interrupt source to configure.
/// \param mode  Triggering mode and priority of the interrupt.
/// \param handler  Interrupt handler function.
//------------------------------------------------------------------------------
void AIC_ConfigureIT(
    unsigned int source,
    unsigned int mode,
    void (*handler)(void))
{
    // Disable the interrupt first
    AT91C_BASE_AIC->AIC_IDCR = 1 << source;

    // Configure mode and handler
    AT91C_BASE_AIC->AIC_SMR[source] = mode;
    AT91C_BASE_AIC->AIC_SVR[source] = (unsigned int) handler;

    // Clear interrupt
    AT91C_BASE_AIC->AIC_ICCR = 1 << source;
}

//------------------------------------------------------------------------------
/// Enables interrupts coming from the given (unique) source (AT91C_ID_xxx).
/// \param source  Interrupt source to enable.
//------------------------------------------------------------------------------
void AIC_EnableIT(unsigned int source)
{
    AT91C_BASE_AIC->AIC_IECR = 1 << source;
}

//------------------------------------------------------------------------------
/// Disables interrupts coming from the given (unique) source (AT91C_ID_xxx).
/// \param source  Interrupt source to enable.
//------------------------------------------------------------------------------
void AIC_DisableIT(unsigned int source)
{
    AT91C_BASE_AIC->AIC_IDCR = 1 << source;
}