我用TMS320F2407的SPI外扩EEPROM,EEPROM的型号为ATMEL25640A,在通讯时收不到EEPROM返回的数据,请教做过相关项目的朋友,请指点一二.不胜感激!
附上读取EEPROM状态的程序.
#include "register.h" /********SPI MEMORY INSTRUCTION SFR DEFINES****************/
#define WREN 0x0006
#define WRDI 0x0004
#define RDSR 0x0005
#define WRSR 0x0001
#define READ 0x0003
#define WRITE 0x0002
#define READY_TO_SEND 0x0000 //the SPI interface is ready to send
#define TRANSFER_COMPLETED 0x000C //the read access is completed whithout error
#define BUSY 0x0005 //the SPI memory or the SPI interface is busy.
#define INSTRUCTION 0x0001 //the op_code has been transferred
#define SEND_COMPLETED 0x0006 //multi_bytes transmit completed
#define ADDRESS 0x0002 //address of Eprom is two bytes long
#define DATA 0x0004
#define FULL 0x000A
#define BUSY1 0x000B
/**************************the follow program are set the i/o port to
select|deselect EEPROM
******************************************************************/
/****************************IOPORT_INITIAL***************************/
void IoportInital()
{
*MCRC=*MCRC&0x0000; //config IOPE,IOPF as IOPORT
*PFDATDIR=*PFDATDIR|0xFF00; //portF as output
}
/*********************CHIP_SELECT*********************************/
void ChipSelect()
{
*PFDATDIR=*PFDATDIR&0xFF00; //pull down cs, port value=0
}
/*********************CHIP_DESELECT***************************/
void ChipDeselect()
{
*PFDATDIR=*PFDATDIR|0x00FF; //pull high cs,port value=1
}
/*******Disable Interrupt*******/
void inline disable()
{
asm(" setc INTM ");
}
/*******Enable Interrupt********/
void inline enable()
{
asm(" clrc INTM ");
}
/*******System Initial************/
void initial()
{
asm(" setc SXM ");
asm(" clrc OVM ");
asm(" clrc CNF ");
*SCSR1=0x8322; //CLKIN=20M,CLKOUT=20M*2=40M,Enable SPI Clock
*WDCR=0x0E8; //Disable WatchDog
*IMR=0x0001; //Enable Interrupt1(High PRI SPI interrupt)
*IFR=0x0FFFF; //Clear Interrupt Flag
*WSGR=0x0000; //Disable WaitState
}
/***********SPI_INT_ENABLE******
**********************************/
void spi_int_enable()
{
// *SPICCR&=0x007F; //enter Reset mode to configure SFR
*SPICTL|=0x0001;
// *SPICCR|=0x0080; //quit Reset mode(corressponding to firtst line
}
/*****************************************/ /***********SPI_INT_DISABLE***************/
void spi_int_disable()
{
// *SPICCR=*SPICCR&0x007F; //enter Reset mode to configure SFR
*SPICTL=*SPICTL&0xFFFE;
// *SPICCR=*SPICCR|0x0080; //quit Reset mode(corressponding to firtst line
} /*****************************************/
/***********SPI Initial**************/
int spi_initial()
{
*SPICCR=0x0007; //8 char bits,data transfer at rising edge
//and receive at falling edge enter Reset mode
*SPICTL=0x0007; //enable spi int,enable transfer,work mode: master
// *SPIBRR=0x0003; //CLKOUT=40M,BAUDRATE=10M,according to formula
*SPIBRR=0x0007; //CLKOUT=40M,BAUDRATE=5M,according to formula
*MCRB=0x003C; //set IO as SPI function port
*SPICCR|=0x0080; //quit Reset mode,in accordance with the first line
state=READY_TO_SEND;
}
/*********SPI_TRANSFER****************
*the function is the elementary function that handles the spi********
*interface in polling mode.it sends a byte and stores the received one** ******************************************/
int spi_transfer(int data)
{
int flag,data_in=0x0000;
flag=*SPISTS&0x0040; //flag=SPI INT FLAG
*SPITXBUF=(data<<8);
while(flag=!0x0040){;}
return (*SPIRXBUF>>8);
} /************GetStatuRegister************** **this function performs a RDSR access,it returns the access status code**
********************************************/
int GetStatusRegister(int *status)
{
if(state==READY_TO_SEND)
{
spi_int_disable(); //read the spi memory status register,disable interrupt first
ChipSelect(); //pull down the CS
spi_transfer(RDSR); //transmit the op_code RDSR
*status=spi_transfer(0xFF); //get the status value
inner++;
ChipDeselect(); // pull high the CS
spi_int_enable(); //enable interrupt
return TRANSFER_COMPLETED; //transfer completed
}
else
{
*status=1;
return BUSY;
}
}
/*********************************main*************************************/
void main()
{
int inner;
disable(); //disable all interrupt
initial(); //system initial
spi_initial(); //spi initial
IoportInital(); //ioport initial
enable(); //enable interrupt
while(1)
{
inner=GetStatusRegister(&jj);
} 我用这样的程序读取EEPROM的状态字,却收不到返回的信号,请问是哪里出了问题? 拜谢!
| 
