pwm.c

lm3s下lwip的udp

    //
    // Synchronize the counters in the specified generators by writing to the
    // module's synchronization register.
    //
    HWREG(ulBase + PWM_O_SYNC) = ulGenBits;
}

//*****************************************************************************
//
//! Enables or disables PWM outputs.
//!
//! \param ulBase is the base address of the PWM module.
//! \param ulPWMOutBits are the PWM outputs to be modified.  Must be the
//! logical OR of any of \b PWM_OUT_0_BIT, \b PWM_OUT_1_BIT, \b PWM_OUT_2_BIT,
//! \b PWM_OUT_3_BIT, \b PWM_OUT_4_BIT, \b PWM_OUT_5_BIT, \b PWM_OUT_6_BIT,
//! or \b PWM_OUT_7_BIT.
//! \param bEnable determines if the signal is enabled or disabled.
//!
//! This function is used to enable or disable the selected PWM outputs.  The
//! outputs are selected using the parameter \e ulPWMOutBits.  The parameter
//! \e bEnable determines the state of the selected outputs.  If \e bEnable is
//! \b true, then the selected PWM outputs are enabled, or placed in the active
//! state.  If \e bEnable is \b false, then the selected outputs are disabled,
//! or placed in the inactive state.
//!
//! \return None.
//
//*****************************************************************************
void
PWMOutputState(unsigned long ulBase, unsigned long ulPWMOutBits,
               tBoolean bEnable)
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == PWM_BASE);
    ASSERT(!(ulPWMOutBits & ~(PWM_OUT_0_BIT | PWM_OUT_1_BIT | PWM_OUT_2_BIT |
                              PWM_OUT_3_BIT | PWM_OUT_4_BIT | PWM_OUT_5_BIT |
                              PWM_OUT_6_BIT | PWM_OUT_7_BIT)));

    //
    // Read the module's ENABLE output control register, and set or clear the
    // requested bits.
    //
    if(bEnable == true)
    {
        HWREG(ulBase + PWM_O_ENABLE) |= ulPWMOutBits;
    }
    else
    {
        HWREG(ulBase + PWM_O_ENABLE) &= ~(ulPWMOutBits);
    }
}

//*****************************************************************************
//
//! Selects the inversion mode for PWM outputs.
//!
//! \param ulBase is the base address of the PWM module.
//! \param ulPWMOutBits are the PWM outputs to be modified.  Must be the
//! logical OR of any of \b PWM_OUT_0_BIT, \b PWM_OUT_1_BIT, \b PWM_OUT_2_BIT,
//! \b PWM_OUT_3_BIT, \b PWM_OUT_4_BIT, \b PWM_OUT_5_BIT, \b PWM_OUT_6_BIT, or
//! \b PWM_OUT_7_BIT.
//! \param bInvert determines if the signal is inverted or passed through.
//!
//! This function is used to select the inversion mode for the selected PWM
//! outputs.  The outputs are selected using the parameter \e ulPWMOutBits.
//! The parameter \e bInvert determines the inversion mode for the selected
//! outputs.  If \e bInvert is \b true, this function will cause the specified
//! PWM output signals to be inverted, or made active low.  If \e bInvert is
//! \b false, the specified output will be passed through as is, or be made
//! active high.
//!
//! \return None.
//
//*****************************************************************************
void
PWMOutputInvert(unsigned long ulBase, unsigned long ulPWMOutBits,
                tBoolean bInvert)
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == PWM_BASE);
    ASSERT(!(ulPWMOutBits & ~(PWM_OUT_0_BIT | PWM_OUT_1_BIT | PWM_OUT_2_BIT |
                              PWM_OUT_3_BIT | PWM_OUT_4_BIT | PWM_OUT_5_BIT |
                              PWM_OUT_6_BIT | PWM_OUT_7_BIT)));

    //
    // Read the module's INVERT output control register, and set or clear the
    // requested bits.
    //
    if(bInvert == true)
    {
        HWREG(ulBase + PWM_O_INVERT) |= ulPWMOutBits;
    }
    else
    {
        HWREG(ulBase + PWM_O_INVERT) &= ~(ulPWMOutBits);
    }
}

//*****************************************************************************
//
//! Specifies the level of PWM outputs suppressed in response to a fault
//! condition.
//!
//! \param ulBase is the base address of the PWM module.
//! \param ulPWMOutBits are the PWM outputs to be modified.  Must be the
//! logical OR of any of \b PWM_OUT_0_BIT, \b PWM_OUT_1_BIT, \b PWM_OUT_2_BIT,
//! \b PWM_OUT_3_BIT, \b PWM_OUT_4_BIT, \b PWM_OUT_5_BIT, \b PWM_OUT_6_BIT, or
//! \b PWM_OUT_7_BIT.
//! \param bDriveHigh determines if the signal is driven high or low during an
//! active fault condition.
//!
//! This function determines whether a PWM output pin that is suppressed in
//! response to a fault condition will be driven high or low.  The affected
//! outputs are selected using the parameter \e ulPWMOutBits.  The parameter
//! \e bDriveHigh determines the output level for the pins identified by
//! \e ulPWMOutBits.  If \e bDriveHigh is \b true then the selected outputs
//! will be driven high when a fault is detected.  If it is \e false, the pins
//! will be driven low.
//!
//! In a fault condition, pins which have not been configured to be suppressed
//! via a call to PWMOutputFault() are unaffected by this function.
//!
//! \note This function is available only on devices which support extended
//! PWM fault handling.
//!
//! \return None.
//
//*****************************************************************************
void
PWMOutputFaultLevel(unsigned long ulBase, unsigned long ulPWMOutBits,
                    tBoolean bDriveHigh)
{
    //
    // Check the arguments.
    //
    ASSERT(HWREG(SYSCTL_DC5) & SYSCTL_DC5_PWMEFLT);
    ASSERT(ulBase == PWM_BASE);
    ASSERT(!(ulPWMOutBits & ~(PWM_OUT_0_BIT | PWM_OUT_1_BIT | PWM_OUT_2_BIT |
                              PWM_OUT_3_BIT | PWM_OUT_4_BIT | PWM_OUT_5_BIT |
                              PWM_OUT_6_BIT | PWM_OUT_7_BIT)));

    //
    // Read the module's FAULT output control register, and set or clear the
    // requested bits.
    //
    if(bDriveHigh == true)
    {
        HWREG(ulBase + PWM_O_FAULTVAL) |= ulPWMOutBits;
    }
    else
    {
        HWREG(ulBase + PWM_O_FAULTVAL) &= ~(ulPWMOutBits);
    }
}

//*****************************************************************************
//
//! Specifies the state of PWM outputs in response to a fault condition.
//!
//! \param ulBase is the base address of the PWM module.
//! \param ulPWMOutBits are the PWM outputs to be modified.  Must be the
//! logical OR of any of \b PWM_OUT_0_BIT, \b PWM_OUT_1_BIT, \b PWM_OUT_2_BIT,
//! \b PWM_OUT_3_BIT, \b PWM_OUT_4_BIT, \b PWM_OUT_5_BIT, \b PWM_OUT_6_BIT, or
//! \b PWM_OUT_7_BIT.
//! \param bFaultSuppress determines if the signal is suppressed or passed
//! through during an active fault condition.
//!
//! This function sets the fault handling characteristics of the selected PWM
//! outputs.  The outputs are selected using the parameter \e ulPWMOutBits.
//! The parameter \e bFaultSuppress determines the fault handling
//! characteristics for the selected outputs.  If \e bFaultSuppress is \b true,
//! then the selected outputs will be made inactive.  If \e bFaultSuppress is
//! \b false, then the selected outputs are unaffected by the detected fault.
//!
//! On devices supporting extended PWM fault handling, the state the affected
//! output pins are driven to can be configured with PWMOutputFaultLevel().  If
//! not configured, or if the device does not support extended PWM fault
//! handling, affected outputs will be driven low on a fault condition.
//!
//! \return None.
//
//*****************************************************************************
void
PWMOutputFault(unsigned long ulBase, unsigned long ulPWMOutBits,
               tBoolean bFaultSuppress)
{
    //
    // Check the arguments.
    //
    ASSERT(ulBase == PWM_BASE);
    ASSERT(!(ulPWMOutBits & ~(PWM_OUT_0_BIT | PWM_OUT_1_BIT | PWM_OUT_2_BIT |
                              PWM_OUT_3_BIT | PWM_OUT_4_BIT | PWM_OUT_5_BIT |
                              PWM_OUT_6_BIT | PWM_OUT_7_BIT)));

    //
    // Read the module's FAULT output control register, and set or clear the
    // requested bits.
    //
    if(bFaultSuppress == true)
    {
        HWREG(ulBase + PWM_O_FAULT) |= ulPWMOutBits;
    }
    else
    {
        HWREG(ulBase + PWM_O_FAULT) &= ~(ulPWMOutBits);
    }
}

//*****************************************************************************
//
//! Registers an interrupt handler for the specified PWM generator block.
//!
//! \param ulBase is the base address of the PWM module.
//! \param ulGen is the PWM generator in question.  Must be one of
//! \b PWM_GEN_0, \b PWM_GEN_1, \b PWM_GEN_2, or \b PWM_GEN_3.
//! \param pfnIntHandler is a pointer to the function to be called when the PWM
//! generator interrupt occurs.
//!
//! This function will ensure that the interrupt handler specified by
//! \e pfnIntHandler is called when an interrupt is detected for the specified
//! PWM generator block.  This function will also enable the corresponding
//! PWM generator interrupt in the interrupt controller; individual generator
//! interrupts and interrupt sources must be enabled with PWMIntEnable() and
//! PWMGenIntTrigEnable().
//!
//! \sa IntRegister() for important information about registering interrupt
//! handlers.
//!
//! \return None.
//
//*****************************************************************************
void
PWMGenIntRegister(unsigned long ulBase, unsigned long ulGen,
                  void (*pfnIntHandler)(void))
{
    unsigned long ulInt;

    //
    // Check the arguments.
    //
    ASSERT(ulBase == PWM_BASE);
    ASSERT(PWMGenValid(ulGen));

    //
    // Get the interrupt number associated with the specified generator.
    //
    if(ulGen == PWM_GEN_3)
    {
        ulInt = INT_PWM3;
    }
    else
    {
        ulInt = INT_PWM0 + (ulGen >> 6) - 1;
    }

    //
    // Register the interrupt handler.
    //
    IntRegister(ulInt, pfnIntHandler);

    //
    // Enable the PWMx interrupt.
    //
    IntEnable(ulInt);
}

//*****************************************************************************
//
//! Removes an interrupt handler for the specified PWM generator block.
//!
//! \param ulBase is the base address of the PWM module.
//! \param ulGen is the PWM generator in question.  Must be one of
//! \b PWM_GEN_0, \b PWM_GEN_1, \b PWM_GEN_2, or \b PWM_GEN_3.
//!
//! This function will unregister the interrupt handler for the specified
//! PWM generator block.  This function will also disable the corresponding
//! PWM generator interrupt in the interrupt controller; individual generator
//! interrupts and interrupt sources must be disabled with PWMIntDisable() and
//! PWMGenIntTrigDisable().
//!
//! \sa IntRegister() for important information about registering interrupt
//! handlers.
//!
//! \return None.
//
//*****************************************************************************
void
PWMGenIntUnregister(unsigned long ulBase, unsigned long ulGen)
{
    unsigned long ulInt;

    //
    // Check the arguments.
    //
    ASSERT(ulBase == PWM_BASE);
    ASSERT(PWMGenValid(ulGen));

    //
    // Get the interrupt number associated with the specified generator.
    //
    if(ulGen == PWM_GEN_3)
    {
        ulInt = INT_PWM3;
    }
    else
    {
        ulInt = INT_PWM0 + (ulGen >> 6) - 1;
    }

    //
    // Disable the PWMx interrupt.
    //
    IntDisable(ulInt);

    //
    // Unregister the interrupt handler.
    //
    IntUnregister(ulInt);
}

//*****************************************************************************
//
//! Registers an interrupt handler for a fault condition detected in a PWM
//! module.
//!
//! \param ulBase is the base address of the PWM module.
//! \param pfnIntHandler is a pointer to the function to be called when the PWM
//! fault interrupt occurs.
//!
//! This function will ensure that the interrupt handler specified by
//! \e pfnIntHandler is called when a fault interrupt is detected for the
//! selected PWM module.  This function will also enable the PWM fault
//! interrupt in the NVIC; the PWM fault interrupt must also be enabled at the
//! module level using PWMIntEnable().
//!