dsp28_spi.c

SPI接口EEPROM驱动 EEPROMWRITE（绝对地址

//
//      TMDX ALPHA RELEASE
//      Intended for product evaluation purposes
//
//###########################################################################
//
// FILE:	DSP28_Spi.c
//
// TITLE:	DSP28 SPI Initialization & Support Functions.
//
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  0.55| 06 May 2002 | L.H. | EzDSP Alpha Release
//  0.56| 20 May 2002 | L.H. | No change
//  0.57| 27 May 2002 | L.H. | No change
//###########################################################################

#include "DSP28_Device.h"

//---------------------------------------------------------------------------
// InitSPI: 
//---------------------------------------------------------------------------
// This function initializes the SPI(s) to a known state.
//
void InitSpi(void)
{
	// Initialize SPI-A:
	EALLOW;
	GpioMuxRegs.GPFMUX.all = 0x0007;  //外设
	GpioMuxRegs.GPFDIR.bit.GPIOF3 = 1;//out
	EDIS;
	GpioDataRegs.GPFDAT.bit.GPIOF3 = 1;
	/* 8 bit data */
	SpiaRegs.SPICCR.all = 0x07;       //上升沿8位长度
	
	SpiaRegs.SPICTL.all = 0x0E;		  //信号延迟.3/主机/使能发送.1/en int
	
	SpiaRegs.SPIBRR = 0x0e;			  //低速外设BAUDRATE=150M/4/15=2.5M
	
	SpiaRegs.SPICCR.all = 0x87;		  //准备下一字节收发
	

	PieCtrl.PIEIER6.bit.INTx1 = 1;
	PieCtrl.PIEIER6.bit.INTx2 = 1;
	//tbd...
	//tbd...
	
}

unsigned int Spi_TxReady(void)
{
	unsigned int i;
	if(SpiaRegs.SPISTS.bit.BUFFULL_FLAG == 1)
	{
		i = 0;
	}
	else
	{
		i = 1;
	}
	return(i);
}

unsigned int Spi_RxReady(void)
{
	unsigned int i;
	if(SpiaRegs.SPISTS.bit.INT_FLAG == 1)
	{
		i = 1;
	}
	else
	{
		i = 0;
	}
	return(i);	
}

interrupt void SPIRXINTA_ISR(void);   // SPI
interrupt void SPITXINTA_ISR(void);    // SPI
	
//===========================================================================
// No more.
//===========================================================================