dsp2833x_i2c.c

TMS32028335 的一些例程

// TI File $Revision: /main/1 $
// Checkin $Date: August 18, 2006   13:46:27 $
//###########################################################################
//
// FILE:	DSP2833x_I2C.c
//
// TITLE:	DSP2833x SCI Initialization & Support Functions.
//
//###########################################################################
// $TI Release: DSP2833x Header Files V1.01 $
// $Release Date: September 26, 2007 $
//###########################################################################

#include "DSP2833x_Device.h"     // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h"   // DSP2833x Examples Include File

//---------------------------------------------------------------------------
// InitI2C: 
//---------------------------------------------------------------------------
// This function initializes the I2C to a known state.
//
void InitI2C(void)
{
	// Initialize I2C-A:

	//tbd...
}	

//---------------------------------------------------------------------------
// Example: InitI2CGpio: 
//---------------------------------------------------------------------------
// This function initializes 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.  
// 
// Caution: 
// Only one GPIO pin should be enabled for SDAA operation.
// Only one GPIO pin shoudl be enabled for SCLA operation. 
// Comment out other unwanted lines.

void InitI2CGpio()
{

   EALLOW;
/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.  
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.

	GpioCtrlRegs.GPBPUD.bit.GPIO32 = 0;    // Enable pull-up for GPIO32 (SDAA)
	GpioCtrlRegs.GPBPUD.bit.GPIO33 = 0;	   // Enable pull-up for GPIO33 (SCLA)

/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.

	GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3;  // Asynch input GPIO32 (SDAA)
    GpioCtrlRegs.GPBQSEL1.bit.GPIO33 = 3;  // Asynch input GPIO33 (SCLA)

/* Configure SCI pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be I2C functional pins.
// Comment out other unwanted lines.

	GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 1;   // Configure GPIO32 for SDAA operation
	GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1;   // Configure GPIO33 for SCLA operation
	
    EDIS;
}

	
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