text: //###########################################################################
  //
  // FILE:   F2837xD_I2C.c
  //
  // TITLE:  F2837xD I2C Initialization & Support Functions.
  //
  //###########################################################################
  // $TI Release: F2837xD Support Library v3.05.00.00 $
  // $Release Date: Tue Jun 26 03:15:23 CDT 2018 $
  // $Copyright:
  // Copyright (C) 2013-2018 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.
  // $
  //###########################################################################
  
  //
  // Included Files
  //
  #include "F2837xD_device.h"
  #include "F2837xD_Examples.h"
  
  //
  //---------------------------------------------------------------------------
  // Example: I2cAGpioConfig(), I2cBGpioConfig()
  //---------------------------------------------------------------------------
  // These functions configures GPIO pins to function as I2C pins
  //
  // Each GPIO pin can be configured as a GPIO pin or up to 3 different
  // peripheral functional pins. By default all pins come up as GPIO
  // inputs after reset.
  //
  
  #ifdef CPU1
  //
  // I2cAGpioConfig - Configure I2CA GPIOs
  //                  'I2caDataClkPin' should be assign with one of the
  //                   possible I2C_A SDA - SDL GPIO pin Use defined Macros from
  //                   "F2837xD_I2c_defines.h" for  assignment
  //
  void I2cAGpioConfig(Uint16 I2caDataClkPin)
  {
      EALLOW;
  
      switch(I2caDataClkPin)
      {
          case I2C_A_GPIO0_GPIO1:
  
              //
              // Enable internal pull-up for the selected I2C pins
              // Enable pull-up for GPIO0 (SDAA)
              // Enable pull-up for GPIO1 (SDLA)
              //
              GpioCtrlRegs.GPAPUD.bit.GPIO0 = 0;
              GpioCtrlRegs.GPAPUD.bit.GPIO1 = 0;
  
              //
              // Set qualification for the selected I2C pins
              // Async/no qualification (I/ps sync to SYSCLKOUT by default)
              //
              GpioCtrlRegs.GPAQSEL1.bit.GPIO0 = 3;
              GpioCtrlRegs.GPAQSEL1.bit.GPIO1 = 3;
  
              //
              // Configure which of the possible GPIO pins will be I2C_A pins
              // using GPIO regs
              // Configure GPIO0 for SDAA operation
              // Configure GPIO0 for SDAA operation
              //
              GpioCtrlRegs.GPAGMUX1.bit.GPIO0 = 1;
              GpioCtrlRegs.GPAMUX1.bit.GPIO0  = 2;
  
              //
              // Configure GPIO1 for SDLA operation
              // Configure GPIO1 for SDLA operation
              //
              GpioCtrlRegs.GPAGMUX1.bit.GPIO1 = 1;
              GpioCtrlRegs.GPAMUX1.bit.GPIO1  = 2;
  
              break;
  
          case I2C_A_GPIO32_GPIO33:
              //
              // Enable internal pull-up for the selected I2C pins
              //
              GpioCtrlRegs.GPBPUD.bit.GPIO32 = 0;
              GpioCtrlRegs.GPBPUD.bit.GPIO33 = 0;
  
              //
              // Set qualification for the selected I2C pins
              //
              GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3;
              GpioCtrlRegs.GPBQSEL1.bit.GPIO33 = 3;
  
              //
              // Configure which of the possible GPIO pins will be I2C_A pins
              // using GPIO regs
              //
              GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 1;
              GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1;
  
              break;
  
          case I2C_A_GPIO42_GPIO43:
              //
              // Enable internal pull-up for the selected I2C pins
              //
  
              //
              // Set qualification for the selected I2C pins
              //
  
              //
              // Configure which of the possible GPIO pins will be I2C_A pins
              // using GPIO regs
              //
              break;
  
          case I2C_A_GPIO91_GPIO92:
              //
              // Enable internal pull-up for the selected I2C pins
              //
              GpioCtrlRegs.GPCPUD.bit.GPIO91 = 0;
              GpioCtrlRegs.GPCPUD.bit.GPIO92 = 0;
  
              //
              // Set qualification for the selected I2C pins
              //
                 GpioCtrlRegs.GPCQSEL2.bit.GPIO91 = 3;
                 GpioCtrlRegs.GPCQSEL2.bit.GPIO92 = 3;
  
              //
              // Configure which of the possible GPIO pins will be I2C_A pins
              // using GPIO regs
              //
                 GpioCtrlRegs.GPCGMUX2.bit.GPIO91 = 1;
              GpioCtrlRegs.GPCMUX2.bit.GPIO91 = 2;
                 GpioCtrlRegs.GPCGMUX2.bit.GPIO92 = 1;
              GpioCtrlRegs.GPCMUX2.bit.GPIO92 = 2;
              break;
  
          case I2C_A_GPIO63104_GPIO105:
              //
              // Enable internal pull-up for the selected I2C pins
              //
  
              //
              // Set qualification for the selected I2C pins
              //
  
              //
              // Configure which of the possible GPIO pins will be I2C_A pins
              // using GPIO regs
              //
              break;
  
          default:
  
              break;
  
      } // End of Switch
      EDIS;
  }
  
  //
  // I2cBGpioConfig - Configure I2CB GPIOs
  //                  'I2cbDataClkPin' should be assign with one of the possible
  //                  I2C_B SDA - SDL GPIO pin Use defined Macros from
  //                  "F2837xD_I2c_defines.h" for assignment
  //
  void I2cBGpioConfig(Uint16 I2cbDataClkPin)
  {
      EALLOW;
  
      switch(I2cbDataClkPin)
      {
          case I2C_B_GPIO2_GPIO3:
              //
              // Enable internal pull-up for the selected I2C pins
              // Enable pull-up for GPIO2 (SDAB)
              // Enable pull-up for GPIO3 (SDLB)
              //
              GpioCtrlRegs.GPAPUD.bit.GPIO2 = 0;
              GpioCtrlRegs.GPAPUD.bit.GPIO3 = 0;
  
              //
              // Set qualification for the selected I2C pins
              // Async/no qualification (I/ps sync to SYSCLKOUT by default)
              //
              GpioCtrlRegs.GPAQSEL1.bit.GPIO2 = 3;
              GpioCtrlRegs.GPAQSEL1.bit.GPIO3 = 3;
  
              //
              // Configure which of the possible GPIO pins will be I2C_B pins
              // using GPIO regs
              // Configure GPIO2 for SDAB operation
              // Configure GPIO3 for SDAB operation
              // Configure GPIO1 for SDLB operation
              // Configure GPIO1 for SDLB operation
              //
              GpioCtrlRegs.GPAGMUX1.bit.GPIO2 = 1;
              GpioCtrlRegs.GPAMUX1.bit.GPIO2  = 2;
  
              GpioCtrlRegs.GPAGMUX1.bit.GPIO3 = 1;
              GpioCtrlRegs.GPAMUX1.bit.GPIO3  = 2;
  
              break;
  
          case I2C_B_GPIO134_GPIO35:
              //
              // Enable internal pull-up for the selected I2C pins
              //
  
              //
              // Set qualification for the selected I2C pins
              //
  
              //
              // Configure which of the possible GPIO pins will be I2C_B pins
              // using GPIO regs
              //
              break;
  
          case I2C_B_GPIO40_GPIO41:
              //
              // Enable internal pull-up for the selected I2C pins
              //
  
              //
              // Set qualification for the selected I2C pins
              //
  
              //
              // Configure which of the possible GPIO pins will be I2C_B pins
              // using GPIO regs
              //
              break;
  
          case I2C_B_GPIO66_GPIO69:
              //
              // Enable internal pull-up for the selected I2C pins
              //
              GpioCtrlRegs.GPCPUD.bit.GPIO66 = 0;    //SDAB
              GpioCtrlRegs.GPCPUD.bit.GPIO69 = 0;    //SCLB
  
              //
              // Set qualification for the selected I2C pins
              //
              GpioCtrlRegs.GPCQSEL1.bit.GPIO66 = 3;
              GpioCtrlRegs.GPCQSEL1.bit.GPIO69 = 3;
  
              //
              // Configure which of the possible GPIO pins will be I2C_B pins
              // using GPIO regs
              //
              GpioCtrlRegs.GPCGMUX1.bit.GPIO66 = 1;    //0x6
              GpioCtrlRegs.GPCMUX1.bit.GPIO66 = 2;
  
              GpioCtrlRegs.GPCGMUX1.bit.GPIO69 = 1;    //0x6
              GpioCtrlRegs.GPCMUX1.bit.GPIO69 = 2;
              break;
  
          default:
              break;
  
      }
      EDIS;
  }
  
  #endif
  
  
  //
  // End of file
  //
  