dsp280x_i2c.c

TMS320F2808 DSP芯片的接口控制源码

// TI File $Revision: /main/2 $
// Checkin $Date: December 2, 2004   11:55:13 $
//###########################################################################
//
// FILE:	DSP280x_I2C.c
//
// TITLE:	DSP280x SCI Initialization & Support Functions.
//
//###########################################################################
// $TI Release: DSP280x V1.30 $
// $Release Date: February 10, 2006 $
//###########################################################################

#include "DSP280x_Device.h"     // DSP280x Headerfile Include File
#include "DSP280x_Examples.h"   // DSP280x Examples Include File
void I2CA_Init(void);

//---------------------------------------------------------------------------
// InitI2C: 
//---------------------------------------------------------------------------
// This function initializes the I2C to a known state.
//
void InitI2C(void)
{
	InitI2CGpio();
	I2CA_Init();
	
}	

//---------------------------------------------------------------------------
// 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;

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

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

	GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3;  // Asynch input GPIO32 (SDAA)
    GpioCtrlRegs.GPBQSEL1.bit.GPIO33 = 3;  // Asynch input GPIO33 (SCLA)
    
    SysCtrlRegs.PCLKCR0.bit.I2CAENCLK = 1;	// Turn I2C module clock on

    EDIS;
}


void I2CA_Init(void)
{
   // Initialize I2C
   I2caRegs.I2CMDR.bit.IRS =0;
   I2caRegs.I2CSAR = 0x0050;		// Slave address - EEPROM control code
   I2caRegs.I2CPSC.all = 9;			// Prescaler - need 7-12 Mhz on module clk
   I2caRegs.I2CCLKL = 15;			// NOTE: must be non zero
   I2caRegs.I2CCLKH = 15;			// NOTE: must be non zero
   I2caRegs.I2CIER.all = 0x00;		// Enable SCD & ARDY interrupts

   I2caRegs.I2CMDR.bit.IRS = 1;	// Take I2C out of reset
   									// Stop I2C when suspended   										
}
	
//===========================================================================
// End of file.
//===========================================================================