gpio.c

CAN_FIFO收发例程

    //
    ASSERT(GPIOBaseValid(ulPort));

    //
    // Return the pin value(s).
    //
    return(HWREG(ulPort + (GPIO_O_DATA + (ucPins << 2))));
}

//*****************************************************************************
//
//! Writes a value to the specified pin(s).
//!
//! \param ulPort is the base address of the GPIO port.
//! \param ucPins is the bit-packed representation of the pin(s).
//! \param ucVal is the value to write to the pin(s).
//!
//! Writes the corresponding bit values to the output pin(s) specified by
//! \e ucPins.  Writing to a pin configured as an input pin has no effect.
//!
//! The pin(s) are specified using a bit-packed byte, where each bit that is
//! set identifies the pin to be accessed, and where bit 0 of the byte
//! represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on.
//!
//! \return None.
//
//*****************************************************************************
void
GPIOPinWrite(unsigned long ulPort, unsigned char ucPins, unsigned char ucVal)
{
    //
    // Check the arguments.
    //
    ASSERT(GPIOBaseValid(ulPort));

    //
    // Write the pins.
    //
    HWREG(ulPort + (GPIO_O_DATA + (ucPins << 2))) = ucVal;
}

//*****************************************************************************
//
//! Configures pin(s) for use as analog-to-digital converter inputs.
//!
//! \param ulPort is the base address of the GPIO port.
//! \param ucPins is the bit-packed representation of the pin(s).
//!
//! The analog-to-digital converter input pins must be properly configured
//! to function correctly on DustDevil-class devices.  This function provides
//! the proper configuration for those pin(s).
//!
//! The pin(s) are specified using a bit-packed byte, where each bit that is
//! set identifies the pin to be accessed, and where bit 0 of the byte
//! represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on.
//!
//! \note This cannot be used to turn any pin into an ADC input; it only
//! configures an ADC input pin for proper operation.
//!
//! \return None.
//
//*****************************************************************************
void
GPIOPinTypeADC(unsigned long ulPort, unsigned char ucPins)
{
    //
    // Check the arguments.
    //
    ASSERT(GPIOBaseValid(ulPort));

    //
    // Make the pin(s) be inputs.
    //
    GPIODirModeSet(ulPort, ucPins, GPIO_DIR_MODE_IN);

    //
    // Set the pad(s) for analog operation.
    //
    GPIOPadConfigSet(ulPort, ucPins, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_ANALOG);
}

//*****************************************************************************
//
//! Configures pin(s) for use as a CAN device.
//!
//! \param ulPort is the base address of the GPIO port.
//! \param ucPins is the bit-packed representation of the pin(s).
//!
//! The CAN pins must be properly configured for the CAN peripherals to
//! function correctly.  This function provides a typical configuration for
//! those pin(s); other configurations may work as well depending upon the
//! board setup (for example, using the on-chip pull-ups).
//!
//! The pin(s) are specified using a bit-packed byte, where each bit that is
//! set identifies the pin to be accessed, and where bit 0 of the byte
//! represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on.
//!
//! \note This cannot be used to turn any pin into a CAN pin; it only
//! configures a CAN pin for proper operation.
//!
//! \return None.
//
//*****************************************************************************
void
GPIOPinTypeCAN(unsigned long ulPort, unsigned char ucPins)
{
    //
    // Check the arguments.
    //
    ASSERT(GPIOBaseValid(ulPort));

    //
    // Make the pin(s) be inputs.
    //
    GPIODirModeSet(ulPort, ucPins, GPIO_DIR_MODE_HW);

    //
    // Set the pad(s) for standard push-pull operation.
    //
    GPIOPadConfigSet(ulPort, ucPins, GPIO_STRENGTH_8MA, GPIO_PIN_TYPE_STD);
}

//*****************************************************************************
//
//! Configures pin(s) for use as an analog comparator input.
//!
//! \param ulPort is the base address of the GPIO port.
//! \param ucPins is the bit-packed representation of the pin(s).
//!
//! The analog comparator input pins must be properly configured for the analog
//! comparator to function correctly.  This function provides the proper
//! configuration for those pin(s).
//!
//! The pin(s) are specified using a bit-packed byte, where each bit that is
//! set identifies the pin to be accessed, and where bit 0 of the byte
//! represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on.
//!
//! \note This cannot be used to turn any pin into an analog comparator input;
//! it only configures an analog comparator pin for proper operation.
//!
//! \return None.
//
//*****************************************************************************
void
GPIOPinTypeComparator(unsigned long ulPort, unsigned char ucPins)
{
    //
    // Check the arguments.
    //
    ASSERT(GPIOBaseValid(ulPort));

    //
    // Make the pin(s) be inputs.
    //
    GPIODirModeSet(ulPort, ucPins, GPIO_DIR_MODE_IN);

    //
    // Set the pad(s) for analog operation.
    //
    GPIOPadConfigSet(ulPort, ucPins, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_ANALOG);
}

//*****************************************************************************
//
//! Configures pin(s) for use as GPIO inputs.
//!
//! \param ulPort is the base address of the GPIO port.
//! \param ucPins is the bit-packed representation of the pin(s).
//!
//! The GPIO pins must be properly configured in order to function correctly as
//! GPIO inputs; this is especially true of Fury-class devices where the
//! digital input enable is turned off by default.  This function provides the
//! proper configuration for those pin(s).
//!
//! The pin(s) are specified using a bit-packed byte, where each bit that is
//! set identifies the pin to be accessed, and where bit 0 of the byte
//! represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on.
//!
//! \return None.
//
//*****************************************************************************
void
GPIOPinTypeGPIOInput(unsigned long ulPort, unsigned char ucPins)
{
    //
    // Check the arguments.
    //
    ASSERT(GPIOBaseValid(ulPort));

    //
    // Make the pin(s) be inputs.
    //
    GPIODirModeSet(ulPort, ucPins, GPIO_DIR_MODE_IN);

    //
    // Set the pad(s) for standard push-pull operation.
    //
    GPIOPadConfigSet(ulPort, ucPins, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD);
}

//*****************************************************************************
//
//! Configures pin(s) for use as GPIO outputs.
//!
//! \param ulPort is the base address of the GPIO port.
//! \param ucPins is the bit-packed representation of the pin(s).
//!
//! The GPIO pins must be properly configured in order to function correctly as
//! GPIO outputs; this is especially true of Fury-class devices where the
//! digital input enable is turned off by default.  This function provides the
//! proper configuration for those pin(s).
//!
//! The pin(s) are specified using a bit-packed byte, where each bit that is
//! set identifies the pin to be accessed, and where bit 0 of the byte
//! represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on.
//!
//! \return None.
//
//*****************************************************************************
void
GPIOPinTypeGPIOOutput(unsigned long ulPort, unsigned char ucPins)
{
    //
    // Check the arguments.
    //
    ASSERT(GPIOBaseValid(ulPort));

    //
    // Make the pin(s) be outputs.
    //
    GPIODirModeSet(ulPort, ucPins, GPIO_DIR_MODE_OUT);

    //
    // Set the pad(s) for standard push-pull operation.
    //
    GPIOPadConfigSet(ulPort, ucPins, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD);
}

//*****************************************************************************
//
//! Configures pin(s) for use as GPIO open drain outputs.
//!
//! \param ulPort is the base address of the GPIO port.
//! \param ucPins is the bit-packed representation of the pin(s).
//!
//! The GPIO pins must be properly configured in order to function correctly as
//! GPIO outputs; this is especially true of Fury-class devices where the
//! digital input enable is turned off by default.  This function provides the
//! proper configuration for those pin(s).
//!
//! The pin(s) are specified using a bit-packed byte, where each bit that is
//! set identifies the pin to be accessed, and where bit 0 of the byte
//! represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on.
//!
//! \return None.
//
//*****************************************************************************
void
GPIOPinTypeGPIOOutputOD(unsigned long ulPort, unsigned char ucPins)
{
    //
    // Check the arguments.
    //
    ASSERT(GPIOBaseValid(ulPort));

    //
    // Make the pin(s) be outputs.
    //
    GPIODirModeSet(ulPort, ucPins, GPIO_DIR_MODE_OUT);

    //
    // Set the pad(s) for standard push-pull operation.
    //
    GPIOPadConfigSet(ulPort, ucPins, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_OD);
}

//*****************************************************************************
//
//! Configures pin(s) for use by the I2C peripheral.
//!
//! \param ulPort is the base address of the GPIO port.
//! \param ucPins is the bit-packed representation of the pin(s).
//!
//! The I2C pins must be properly configured for the I2C peripheral to function
//! correctly.  This function provides the proper configuration for those
//! pin(s).
//!
//! The pin(s) are specified using a bit-packed byte, where each bit that is
//! set identifies the pin to be accessed, and where bit 0 of the byte
//! represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on.
//!
//! \note This cannot be used to turn any pin into an I2C pin; it only
//! configures an I2C pin for proper operation.
//!
//! \return None.
//
//*****************************************************************************
void
GPIOPinTypeI2C(unsigned long ulPort, unsigned char ucPins)
{
    //
    // Check the arguments.
    //
    ASSERT(GPIOBaseValid(ulPort));

    //
    // Make the pin(s) be peripheral controlled.
    //
    GPIODirModeSet(ulPort, ucPins, GPIO_DIR_MODE_HW);

    //
    // Set the pad(s) for open-drain operation with a weak pull-up.
    //
    GPIOPadConfigSet(ulPort, ucPins, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_OD_WPU);
}

//*****************************************************************************
//
//! Configures pin(s) for use by the PWM peripheral.
//!
//! \param ulPort is the base address of the GPIO port.
//! \param ucPins is the bit-packed representation of the pin(s).
//!
//! The PWM pins must be properly configured for the PWM peripheral to function
//! correctly.  This function provides a typical configuration for those
//! pin(s); other configurations may work as well depending upon the board
//! setup (for example, using the on-chip pull-ups).
//!
//! The pin(s) are specified using a bit-packed byte, where each bit that is
//! set identifies the pin to be accessed, and where bit 0 of the byte
//! represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on.
//!
//! \note This cannot be used to turn any pin into a PWM pin; it only
//! configures a PWM pin for proper operation.
//!
//! \return None.
//
//*****************************************************************************
void
GPIOPinTypePWM(unsigned long ulPort, unsigned char ucPins)
{
    //
    // Check the arguments.
    //
    ASSERT(GPIOBaseValid(ulPort));

    //
    // Make the pin(s) be peripheral controlled.
    //
    GPIODirModeSet(ulPort, ucPins, GPIO_DIR_MODE_HW);

    //
    // Set the pad(s) for standard push-pull operation.
    //
    GPIOPadConfigSet(ulPort, ucPins, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD);
}

//*****************************************************************************
//
//! Configures pin(s) for use by the QEI peripheral.
//!
//! \param ulPort is the base address of the GPIO port.
//! \param ucPins is the bit-packed representation of the pin(s).
//!
//! The QEI pins must be properly configured for the QEI peripheral to function
//! correctly.  This function provides a typical configuration for those
//! pin(s); other configurations may work as well depending upon the board
//! setup (for example, not using the on-chip pull-ups).
//!
//! The pin(s) are specified using a bit-packed byte, where each bit that is
//! set identifies the pin to be accessed, and where bit 0 of the byte
//! represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on.
//!
//! \note This cannot be used to turn any pin into a QEI pin; it only
//! configures a QEI pin for proper operation.
//!
//! \return None.
//
//*****************************************************************************
void
GPIOPinTypeQEI(unsigned long ulPort, unsigned char ucPins)
{
    //
    // Check the arguments.
    //
    ASSERT(GPIOBaseValid(ulPort));

    //
    // Make the pin(s) be peripheral controlled.
    //
    GPIODirModeSet(ulPort, ucPins, GPIO_DIR_MODE_HW);

    //
    // Set the pad(s) for standard push-pull operation with a weak pull-up.
    //
    GPIOPadConfigSet(ulPort, ucPins, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);
}

//*****************************************************************************
//
//! Configures pin(s) for use by the SSI peripheral.