text: //*****************************************************************************
  //
  //  gpio.h
  //
  //  Defines and Macros for GPIO API.
  //
  //  Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
  //
  //
  //  Redistribution and use in source and binary forms, with or without
  //  modification, are permitted provided that the following conditions
  //  are met:
  //
  //    Redistributions of source code must retain the above copyright
  //    notice, this list of conditions and the following disclaimer.
  //
  //    Redistributions in binary form must reproduce the above copyright
  //    notice, this list of conditions and the following disclaimer in the
  //    documentation and/or other materials provided with the
  //    distribution.
  //
  //    Neither the name of Texas Instruments Incorporated nor the names of
  //    its contributors may be used to endorse or promote products derived
  //    from this software without specific prior written permission.
  //
  //  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  //  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  //  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  //  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  //  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  //  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  //  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  //  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  //  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  //  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  //  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  //*****************************************************************************
  
  #ifndef __GPIO_H__
  #define __GPIO_H__
  
  //*****************************************************************************
  //
  // If building with a C++ compiler, make all of the definitions in this header
  // have a C binding.
  //
  //*****************************************************************************
  #ifdef __cplusplus
  extern "C"
  {
  #endif
  
  //*****************************************************************************
  //
  // The following values define the bit field for the ucPins argument to several
  // of the APIs.
  //
  //*****************************************************************************
  #define GPIO_PIN_0              0x00000001  // GPIO pin 0
  #define GPIO_PIN_1              0x00000002  // GPIO pin 1
  #define GPIO_PIN_2              0x00000004  // GPIO pin 2
  #define GPIO_PIN_3              0x00000008  // GPIO pin 3
  #define GPIO_PIN_4              0x00000010  // GPIO pin 4
  #define GPIO_PIN_5              0x00000020  // GPIO pin 5
  #define GPIO_PIN_6              0x00000040  // GPIO pin 6
  #define GPIO_PIN_7              0x00000080  // GPIO pin 7
  
  //*****************************************************************************
  //
  // Values that can be passed to GPIODirModeSet as the ulPinIO parameter, and
  // returned from GPIODirModeGet.
  //
  //*****************************************************************************
  #define GPIO_DIR_MODE_IN        0x00000000  // Pin is a GPIO input
  #define GPIO_DIR_MODE_OUT       0x00000001  // Pin is a GPIO output
  
  //*****************************************************************************
  //
  // Values that can be passed to GPIOIntTypeSet as the ulIntType parameter, and
  // returned from GPIOIntTypeGet.
  //
  //*****************************************************************************
  #define GPIO_FALLING_EDGE       0x00000000  // Interrupt on falling edge
  #define GPIO_RISING_EDGE        0x00000004  // Interrupt on rising edge
  #define GPIO_BOTH_EDGES         0x00000001  // Interrupt on both edges
  #define GPIO_LOW_LEVEL          0x00000002  // Interrupt on low level
  #define GPIO_HIGH_LEVEL         0x00000006  // Interrupt on high level
  
  //*****************************************************************************
  //
  // Values that can be passed to GPIOIntEnable() and GPIOIntDisable() functions
  // in the ulIntFlags parameter.
  //
  //*****************************************************************************
  #define GPIO_INT_DMA            0x00000100
  #define GPIO_INT_PIN_0          0x00000001
  #define GPIO_INT_PIN_1          0x00000002
  #define GPIO_INT_PIN_2          0x00000004
  #define GPIO_INT_PIN_3          0x00000008
  #define GPIO_INT_PIN_4          0x00000010
  #define GPIO_INT_PIN_5          0x00000020
  #define GPIO_INT_PIN_6          0x00000040
  #define GPIO_INT_PIN_7          0x00000080
  
  //*****************************************************************************
  //
  // Prototypes for the APIs.
  //
  //*****************************************************************************
  extern void GPIODirModeSet(unsigned long ulPort, unsigned char ucPins,
                             unsigned long ulPinIO);
  extern unsigned long GPIODirModeGet(unsigned long ulPort, unsigned char ucPin);
  extern void GPIOIntTypeSet(unsigned long ulPort, unsigned char ucPins,
                             unsigned long ulIntType);
  extern void GPIODMATriggerEnable(unsigned long ulPort);
  extern void GPIODMATriggerDisable(unsigned long ulPort);
  extern unsigned long GPIOIntTypeGet(unsigned long ulPort, unsigned char ucPin);
  extern void GPIOIntEnable(unsigned long ulPort, unsigned long ulIntFlags);
  extern void GPIOIntDisable(unsigned long ulPort, unsigned long ulIntFlags);
  extern long GPIOIntStatus(unsigned long ulPort, tBoolean bMasked);
  extern void GPIOIntClear(unsigned long ulPort, unsigned long ulIntFlags);
  extern void GPIOIntRegister(unsigned long ulPort,
                                  void (*pfnIntHandler)(void));
  extern void GPIOIntUnregister(unsigned long ulPort);
  extern long GPIOPinRead(unsigned long ulPort, unsigned char ucPins);
  extern void GPIOPinWrite(unsigned long ulPort, unsigned char ucPins,
                           unsigned char ucVal);
  
  //*****************************************************************************
  //
  // Mark the end of the C bindings section for C++ compilers.
  //
  //*****************************************************************************
  #ifdef __cplusplus
  }
  #endif
  
  #endif //  __GPIO_H__
  