STM32通過SPI 與EEPROM芯片M95256進行數據讀寫。

//SPI1 寫一個字節
//TxData:要寫入的字節

uint8_t SPI1_WriteByte(uint8_t TxData)
{

    HAL_SPI_Transmit(&hspi1,&TxData,1, 1000);       
	
}

//返回值:讀取到的字節
uint8_t SPI1_ReadByte(void )
{
    uint8_t RxData;
    HAL_SPI_Receive(&hspi1,&RxData,1, 1000);       
 	return RxData;          		    //返回收到的數據		
}

//讀字節函數
void M95256_ReadByte(uint8_t* pBuffer,uint32_t ReadAddr,uint16_t NumByteToRead)
{
    uint16_t i;   
    // 拉低片選信號
   HAL_GPIO_WritePin(NSS_GPIO_Port, NSS_Pin, GPIO_PIN_RESET);    

    SPI1_WriteByte(0x03) ;     // 發送READ指令(0x03)
 	
     SPI1_WriteByte((ReadAddr) >> 8);   
     SPI1_WriteByte(ReadAddr);

    // 發送dummy數據并讀取返回值
	
    for(i=0;i
//SPI在一頁(0~65535)內寫入少于256個字節的數據
//在指定地址開始寫入最大256字節的數據
//pBuffer:數據存儲區
//WriteAddr:開始寫入的地址(16bit)
//NumByteToWrite:要寫入的字節數(最大64),該數不應該超過該頁的剩余字節數!!!	 
void Write_Byte(uint8_t* pBuffer,uint32_t WriteAddr,uint16_t NumByteToWrite)
{
 	uint16_t i;  
	   HAL_GPIO_WritePin(NSS_GPIO_Port, NSS_Pin, GPIO_PIN_RESET);  //使能器件   
    SPI1_WriteByte(0x06) ; 	//寫使能 	
		   HAL_GPIO_WritePin(NSS_GPIO_Port, NSS_Pin, GPIO_PIN_SET); //取消片選 

		   HAL_GPIO_WritePin(NSS_GPIO_Port, NSS_Pin, GPIO_PIN_RESET);  //使能器件  
	
  SPI1_WriteByte(0x02) ; 	//寫使能 //發送寫頁命令   
	
     SPI1_WriteByte((WriteAddr)>>8); //發送16bit地址     
     SPI1_WriteByte(WriteAddr);   
    for(i=0;i
main.c
uint8_t RXtxt_Buffer[100];
const uint8_t TEXT_Buffer[]={0x55,0xaa,0x55,0x55,0x55,0x55,0x55};
Write_Byte((uint8_t*)&TEXT_Buffer1,0x3001,7);
HAL_Delay(2000);
M95256_ReadByte(RXtxt_Buffer,0x3001,7);
printf("M95256_Read Data:%drn", RXtxt_Buffer[0]);         //串口打印信息
printf("M95256_Read Data:%drn", RXtxt_Buffer[1]);         //串口打印信息
printf("M95256_Read Data:%drn", RXtxt_Buffer[2]);         //串口打印信息
printf("M95256_Read Data:%drn", RXtxt_Buffer[6]);         //串口打印信息
HAL_Delay(1000);

審核編輯 黃宇