您好，
自制板上使用的dsp为f28335，使用的eeprom为at25650b。现在想利用eeprom存储数据，然后现在测试dsp往eeprom读写数，或者读取AT25640B状态寄存器，AT25640B的SPi输出一直是高电平，且波形很奇怪。我的SPI的配置是这样的。
/*
* SPI_EEP.c
*
* Created on: 2021年10月16日
* Author:
*/
#include "SPI_EEP.h"
void InitSpiGpio()
{
InitSpiaGpio();
}
void InitSpiaGpio()
{
EALLOW;
GpioCtrlRegs.GPBPUD.bit.GPIO54 = 0; // Enable pull-up on GPIO54 (SPISIMOA)
GpioCtrlRegs.GPBPUD.bit.GPIO55 = 0; // Enable pull-up on GPIO55 (SPISOMIA)
GpioCtrlRegs.GPBPUD.bit.GPIO56 = 0; // Enable pull-up on GPIO56 (SPICLKA)
// GpioCtrlRegs.GPBPUD.bit.GPIO57 = 0; // Enable pull-up on GPIO57 (SPISTEA)
GpioCtrlRegs.GPBQSEL2.bit.GPIO54 = 3; // Asynch input GPIO16 (SPISIMOA)
GpioCtrlRegs.GPBQSEL2.bit.GPIO55 = 3; // Asynch input GPIO17 (SPISOMIA)
GpioCtrlRegs.GPBQSEL2.bit.GPIO56 = 3; // Asynch input GPIO18 (SPICLKA)
GpioCtrlRegs.GPBQSEL2.bit.GPIO57 = 3; // Asynch input GPIO19 (SPISTEA)
GpioCtrlRegs.GPBMUX2.bit.GPIO54 = 1; // Configure GPIO54 as SPISIMOA
GpioCtrlRegs.GPBMUX2.bit.GPIO55 = 1; // Configure GPIO55 as SPISOMIA
GpioCtrlRegs.GPBMUX2.bit.GPIO56 = 1; // Configure GPIO56 as SPICLKA
// GpioCtrlRegs.GPBMUX2.bit.GPIO57 = 1; // Configure GPIO57 as SPISTEA
GpioCtrlRegs.GPBMUX2.bit.GPIO57=0;
GpioDataRegs.GPBSET.bit.GPIO57=1;
GpioCtrlRegs.GPBPUD.bit.GPIO57=0;
GpioCtrlRegs.GPBDIR.bit.GPIO57=1;
EDIS;
}
void SPIA_Init(void)
{
InitSpiaGpio();
EALLOW;
SysCtrlRegs.PCLKCR0.bit.SPIAENCLK = 1; // SPI-A
EDIS;
SpiaRegs.SPICCR.bit.SPISWRESET = 0; // Reset SPI
SpiaRegs.SPICCR.all =0x0007; // 数据不复位，上升沿输出、下降沿输入、保留位0、禁用回还模式、传输位数8位。
SpiaRegs.SPICTL.all =0x0006; // 使能主机模式，正常相位，使能主机发送，禁止接收,溢出中断，禁止SPI中断,正常模式；
SpiaRegs.SPIBRR=0x0063; //SPI波特率=375000
// SpiaRegs.SPICCR.bit.CLKPOLARITY = 0;
// SpiaRegs.SPICTL.bit.CLK_PHASE=1;
SpiaRegs.SPICCR.all =0x0087; // Relinquish SPI from Reset
SpiaRegs.SPIPRI.bit.FREE = 0x0001; // Set so breakpoints don't disturb xmission
SpiaRegs.SPICCR.bit.SPISWRESET = 1; // Reset SPI
}
//uint8_t SPIA_SendReciveData(uint8_t dat)
//{
// // Transmit data
// SpiaRegs.SPITXBUF=dat;
//
// // Wait until data is received
//// while(SpiaRegs.SPIFFRX.bit.RXFFST !=1);
// while(SpiaRegs.SPISTS.bit.INT_FLAG !=1);
// return SpiaRegs.SPIRXBUF;
//}
uint8_t SPIA_SendReciveData(uint8_t dat)
{
u8 retry=0;
while(SpiaRegs.SPISTS.bit.BUFFULL_FLAG == 1) //等待发送区空 发送缓冲区空时 SR的bit1 为1 不空的时为0 与后的结果为0，继续等待
{
retry++;
if(retry>200)return 0;
}
SpiaRegs.SPITXBUF=(dat|0x8000)<<8 ; //发送一个byte
retry=0;
while(SpiaRegs.SPISTS.bit.INT_FLAG != 1)
{
retry++;
if(retry>200)return 0;
}
return ((SpiaRegs.SPIRXBUF)&0x00ff); //返回收到的数据
}
/*
* @name:eeprom_read_write_byte
* @function：读取数据
* @Author:
*/
u8 stsss=2;
//u8 eeprom_read_write_byte(u8 TxData)
//{
// SpiaRegs.SPITXBUF=TxData;
//
// // Wait until data is received
//// while(SpiaRegs.SPIFFRX.bit.RXFFST !=1);
// while(SpiaRegs.SPISTS.bit.INT_FLAG==0){};
//// Delay_US(8);
// DELAY_US(15);
// stsss=SpiaRegs.SPISTS.bit.INT_FLAG ;
// return SpiaRegs.SPIRXBUF;
//}
u16 eeprom_read_write_byte(u16 dat)
{
u8 retry=0;
while(SpiaRegs.SPISTS.bit.BUFFULL_FLAG == 1) //等待发送区空 发送缓冲区空时 SR的bit1 为1 不空的时为0 与后的结果为0，继续等待
{
retry++;
if(retry>200)return 0;
}
SpiaRegs.SPITXBUF=(dat|0x8000)<<8 ; //发送一个byte
retry=0;
while(SpiaRegs.SPISTS.bit.INT_FLAG != 1)
{
retry++;
if(retry>200)return 0;
}
return ((SpiaRegs.SPIRXBUF)&0x00ff); //返回收到的数据
}
/*
* @name:eeprom_read_sr
* @function：读取AT25640状态寄存器
* @Author:
*/
u8 temppp=0;
u8 eeprom_read_sr(void)
{
u8 dat;
eeprom_ncs;
eeprom_read_write_byte(RDSR);
// DELAY_US(15);
dat = eeprom_read_write_byte(0x00);
eeprom_cs;
temppp=dat;
return dat;
}
/*
* @name:eeprom_write_byte
* @function：写入一个数据
* @Author:
*/
u8 ddd=0;
void eeprom_write_byte(u16 addr,u8 Dat)//没有问题
{
unsigned char Add;
// ddd=eeprom_read_sr()&RDY;
// while(eeprom_read_sr()&RDY);//等待就绪信号
// while(0);//等待就绪信号
eeprom_ncs;//片选
eeprom_read_write_byte(WREN);//启用数据写入状态
eeprom_cs;
eeprom_ncs;
if(addr>0x00ff)
eeprom_read_write_byte((WRITE|0x08));
else
eeprom_read_write_byte(WRITE);
Add = (unsigned char)(addr & 0x00);
eeprom_read_write_byte(Add);
eeprom_read_write_byte(Dat);
eeprom_cs;
}
/*
* @name:eeprom_read_byte
* @function：读取一个字节
* @Author:
*/
u8 eeprom_read_byte(u16 addr)//没有问题
{
u8 dat,add;
// while(eeprom_read_sr()&RDY);
// while(0);//等待就绪信号
eeprom_ncs;
if(addr>0x00ff)
eeprom_read_write_byte((READ | 0x08));
else
eeprom_read_write_byte(READ);
add = (unsigned char)(addr & 0x00);
eeprom_read_write_byte(add);
dat=eeprom_read_write_byte(0x00);
eeprom_cs;
return dat;
}
/*
* @name:eeprom_read_write_byte
* @function：连续写入数据
* @Author:
*/
void eeprom_write_buf(u16 startAddr,u8 *buf,u16 count)
{
u16 i;
while(eeprom_read_sr()&RDY);
eeprom_ncs;
eeprom_read_write_byte(WREN);
eeprom_cs;
eeprom_ncs;
eeprom_read_write_byte(WRITE);
eeprom_read_write_byte(startAddr>>8);
eeprom_read_write_byte(startAddr);
for(i=0;i<count;i++)
{
eeprom_read_write_byte(*buf++);
}
eeprom_cs;
}
/*
* @name:eeprom_write_nbyte
* @function：连续写入n字节数据
* @Author:
*/
void eeprom_write_nbyte(u16 startAddr,u8 *buf,u16 count)
{
u16 pageTotal=count/64;
u16 pageResidue=count%64;
u16 i;
u16 pageCnt=0;
for(i=0;i<pageTotal;i++)
{
eeprom_write_buf(startAddr+pageCnt,&buf[pageCnt],64);
pageCnt+=64;
}
eeprom_write_buf(startAddr+pageCnt,&buf[pageCnt],pageResidue);
}
/*
* @name:eeprom_read_buf
* @function：连续读取数据
* @Author:
*/
void eeprom_read_buf(u16 startAddr,u8 *buf,u16 count)
{
unsigned int i;
while(eeprom_read_sr()&RDY);
eeprom_ncs;
eeprom_read_write_byte(READ);
eeprom_read_write_byte(startAddr>>8);
eeprom_read_write_byte(startAddr);
for(i=0;i<count;i++)
{
*buf++ = eeprom_read_write_byte(0x00);
}
eeprom_cs;
}
