i2c.c

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    //
    // Enable the master interrupt.
    //
    HWREG(ulBase + I2C_O_MIMR) = 1;
}

//*****************************************************************************
//
//! Enables the I2C Slave interrupt.
//!
//! \param ulBase is the base address of the I2C Slave module.
//!
//! Enables the I2C Slave interrupt source.
//!
//! \return None.
//
//*****************************************************************************
void
I2CSlaveIntEnable(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == I2C0_SLAVE_BASE) || (ulBase == I2C1_SLAVE_BASE));

    //
    // Enable the slave interrupt.
    //
    HWREG(ulBase + I2C_O_SIMR) |= I2C_SLAVE_INT_DATA;
}

//*****************************************************************************
//
//! Enables individual I2C Slave interrupt sources.
//!
//! \param ulBase is the base address of the I2C Slave module.
//! \param ulIntFlags is the bit mask of the interrupt sources to be enabled.
//!
//! Enables the indicated I2C Slave interrupt sources.  Only the sources that
//! are enabled can be reflected to the processor interrupt; disabled sources
//! have no effect on the processor.
//!
//! The \e ulIntFlags parameter is the logical OR of any of the following:
//!
//! - \b I2C_SLAVE_INT_STOP - Stop condition detected interrupt
//! - \b I2C_SLAVE_INT_START - Start condition detected interrupt
//! - \b I2C_SLAVE_INT_DATA - Data interrupt
//!
//! \return None.
//
//*****************************************************************************
void
I2CSlaveIntEnableEx(unsigned long ulBase, unsigned long ulIntFlags)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == I2C0_SLAVE_BASE) || (ulBase == I2C1_SLAVE_BASE));

    //
    // Enable the slave interrupt.
    //
    HWREG(ulBase + I2C_O_SIMR) |= ulIntFlags;
}

//*****************************************************************************
//
//! Disables the I2C Master interrupt.
//!
//! \param ulBase is the base address of the I2C Master module.
//!
//! Disables the I2C Master interrupt source.
//!
//! \return None.
//
//*****************************************************************************
void
I2CMasterIntDisable(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == I2C0_MASTER_BASE) || (ulBase == I2C1_MASTER_BASE));

    //
    // Disable the master interrupt.
    //
    HWREG(ulBase + I2C_O_MIMR) = 0;
}

//*****************************************************************************
//
//! Disables the I2C Slave interrupt.
//!
//! \param ulBase is the base address of the I2C Slave module.
//!
//! Disables the I2C Slave interrupt source.
//!
//! \return None.
//
//*****************************************************************************
void
I2CSlaveIntDisable(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == I2C0_SLAVE_BASE) || (ulBase == I2C1_SLAVE_BASE));

    //
    // Disable the slave interrupt.
    //
    HWREG(ulBase + I2C_O_SIMR) &= ~I2C_SLAVE_INT_DATA;
}

//*****************************************************************************
//
//! Disables individual I2C Slave interrupt sources.
//!
//! \param ulBase is the base address of the I2C Slave module.
//! \param ulIntFlags is the bit mask of the interrupt sources to be disabled.
//!
//! Disables the indicated I2C Slave interrupt sources.  Only the sources that
//! are enabled can be reflected to the processor interrupt; disabled sources
//! have no effect on the processor.
//!
//! The \e ulIntFlags parameter has the same definition as the \e ulIntFlags
//! parameter to I2CSlaveIntEnableEx().
//!
//! \return None.
//
//*****************************************************************************
void
I2CSlaveIntDisableEx(unsigned long ulBase, unsigned long ulIntFlags)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == I2C0_SLAVE_BASE) || (ulBase == I2C1_SLAVE_BASE));

    //
    // Disable the slave interrupt.
    //
    HWREG(ulBase + I2C_O_SIMR) &= ~ulIntFlags;
}

//*****************************************************************************
//
//! Gets the current I2C Master interrupt status.
//!
//! \param ulBase is the base address of the I2C Master module.
//! \param bMasked is false if the raw interrupt status is requested and
//! true if the masked interrupt status is requested.
//!
//! This returns the interrupt status for the I2C Master module.  Either the
//! raw interrupt status or the status of interrupts that are allowed to
//! reflect to the processor can be returned.
//!
//! \return The current interrupt status, returned as \b true if active
//! or \b false if not active.
//
//*****************************************************************************
tBoolean
I2CMasterIntStatus(unsigned long ulBase, tBoolean bMasked)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == I2C0_MASTER_BASE) || (ulBase == I2C1_MASTER_BASE));

    //
    // Return either the interrupt status or the raw interrupt status as
    // requested.
    //
    if(bMasked)
    {
        return((HWREG(ulBase + I2C_O_MMIS)) ? true : false);
    }
    else
    {
        return((HWREG(ulBase + I2C_O_MRIS)) ? true : false);
    }
}

//*****************************************************************************
//
//! Gets the current I2C Slave interrupt status.
//!
//! \param ulBase is the base address of the I2C Slave module.
//! \param bMasked is false if the raw interrupt status is requested and
//! true if the masked interrupt status is requested.
//!
//! This returns the interrupt status for the I2C Slave module.  Either the raw
//! interrupt status or the status of interrupts that are allowed to reflect to
//! the processor can be returned.
//!
//! \return The current interrupt status, returned as \b true if active
//! or \b false if not active.
//
//*****************************************************************************
tBoolean
I2CSlaveIntStatus(unsigned long ulBase, tBoolean bMasked)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == I2C0_SLAVE_BASE) || (ulBase == I2C1_SLAVE_BASE));

    //
    // Return either the interrupt status or the raw interrupt status as
    // requested.
    //
    if(bMasked)
    {
        return((HWREG(ulBase + I2C_O_SMIS)) ? true : false);
    }
    else
    {
        return((HWREG(ulBase + I2C_O_SRIS)) ? true : false);
    }
}

//*****************************************************************************
//
//! Gets the current I2C Slave interrupt status.
//!
//! \param ulBase is the base address of the I2C Slave module.
//! \param bMasked is false if the raw interrupt status is requested and
//! true if the masked interrupt status is requested.
//!
//! This returns the interrupt status for the I2C Slave module.  Either the raw
//! interrupt status or the status of interrupts that are allowed to reflect to
//! the processor can be returned.
//!
//! \return Returns the current interrupt status, enumerated as a bit field of
//! values described in I2CSlaveIntEnableEx().
//
//*****************************************************************************
unsigned long
I2CSlaveIntStatusEx(unsigned long ulBase, tBoolean bMasked)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == I2C0_SLAVE_BASE) || (ulBase == I2C1_SLAVE_BASE));

    //
    // Return either the interrupt status or the raw interrupt status as
    // requested.
    //
    if(bMasked)
    {
        //
        // Workaround for I2C slave masked interrupt status register errata
        // (7.1) for Dustdevil Rev A0 devices.  For non-Dustdevil Rev A0
        // devices, the following line can be used to improve efficiency.
        //
        //return(HWREG(ulBase + I2C_O_SMIS));
        //
        return(HWREG(ulBase + I2C_O_SRIS) & HWREG(ulBase + I2C_O_SIMR));
    }
    else
    {
        return(HWREG(ulBase + I2C_O_SRIS));
    }
}

//*****************************************************************************
//
//! Clears I2C Master interrupt sources.
//!
//! \param ulBase is the base address of the I2C Master module.
//!
//! The I2C Master interrupt source is cleared, so that it no longer asserts.
//! This must be done in the interrupt handler to keep it from being called
//! again immediately upon exit.
//!
//! \note Since there is a write buffer in the Cortex-M3 processor, it may take
//! several clock cycles before the interrupt source is actually cleared.
//! Therefore, it is recommended that the interrupt source be cleared early in
//! the interrupt handler (as opposed to the very last action) to avoid
//! returning from the interrupt handler before the interrupt source is
//! actually cleared.  Failure to do so may result in the interrupt handler
//! being immediately reentered (since NVIC still sees the interrupt source
//! asserted).
//!
//! \return None.
//
//*****************************************************************************
void
I2CMasterIntClear(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == I2C0_MASTER_BASE) || (ulBase == I2C1_MASTER_BASE));

    //
    // Clear the I2C master interrupt source.
    //
    HWREG(ulBase + I2C_O_MICR) = I2C_MICR_IC;

    //
    // Workaround for I2C master interrupt clear errata for rev B Stellaris
    // devices.  For later devices, this write is ignored and therefore
    // harmless (other than the slight performance hit).
    //
    HWREG(ulBase + I2C_O_MMIS) = I2C_MICR_IC;
}

//*****************************************************************************
//
//! Clears I2C Slave interrupt sources.
//!
//! \param ulBase is the base address of the I2C Slave module.
//!
//! The I2C Slave interrupt source is cleared, so that it no longer asserts.
//! This must be done in the interrupt handler to keep it from being called
//! again immediately upon exit.
//!
//! \note Since there is a write buffer in the Cortex-M3 processor, it may take
//! several clock cycles before the interrupt source is actually cleared.
//! Therefore, it is recommended that the interrupt source be cleared early in
//! the interrupt handler (as opposed to the very last action) to avoid
//! returning from the interrupt handler before the interrupt source is
//! actually cleared.  Failure to do so may result in the interrupt handler
//! being immediately reentered (since NVIC still sees the interrupt source
//! asserted).
//!
//! \return None.
//
//*****************************************************************************
void
I2CSlaveIntClear(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == I2C0_SLAVE_BASE) || (ulBase == I2C1_SLAVE_BASE));

    //
    // Clear the I2C slave interrupt source.
    //
    HWREG(ulBase + I2C_O_SICR) = I2C_SICR_DATAIC;
}

//*****************************************************************************
//
//! Clears I2C Slave interrupt sources.
//!
//! \param ulBase is the base address of the I2C Slave module.
//! \param ulIntFlags is a bit mask of the interrupt sources to be cleared.
//!
//! The specified I2C Slave interrupt sources are cleared, so that they no
//! longer assert.  This must be done in the interrupt handler to keep it from
//! being called again immediately upon exit.
//!
//! The \e ulIntFlags parameter has the same definition as the \e ulIntFlags
//! parameter to I2CSlaveIntEnableEx().
//!
//! \note Since there is a write buffer in the Cortex-M3 processor, it may take
//! several clock cycles before the interrupt source is actually cleared.
//! Therefore, it is recommended that the interrupt source be cleared early in
//! the interrupt handler (as opposed to the very last action) to avoid
//! returning from the interrupt handler before the interrupt source is
//! actually cleared.  Failure to do so may result in the interrupt handler
//! being immediately reentered (since NVIC still sees the interrupt source
//! asserted).