大佬们，急问

只看该作者 · 2022-3-8 17:22

本帖最后由 tyw 于 2022-3-9 12:39 编辑

我用了新唐M4系列的主控，然后用SPI1想和SPI Flash通信，结果写入和读出的数据不准确，是什么原因。以下是我使用的代码
// *****************************************************************************
// 函数名称: void  SPI_Flash_Send_Add(uint32_t  Address)
// 函数功能: 向SPI Flash发送地址
// 入口参数:
// 出口参数:
// 说明:
// *****************************************************************************
void  SPI_Flash_Send_Add(uint32_t  Address)
{
SPI_WRITE_TX(SPI1,(Address>>16)&0xff);
SPI_WRITE_TX(SPI1,(Address>>8)&0xff);
SPI_WRITE_TX(SPI1,Address);
/* Wait ready */
while(SPI_IS_BUSY(SPI1));
}

// *****************************************************************************
// 函数名称: uint8_t  SPI_Flash_Read_Data(uint8_t  *pRamAddress,  uint16_t  cnt)
// 函数功能: 从SPI Flash中读取数据到指定地址的Ram区域
// 入口参数: cnt不能超过SPI传输的最大值!!
// 出口参数:
// 说明:
// *****************************************************************************
void  SPI_Flash_Read_Buff(uint32_t  Address,  uint8_t  *pRamAddress,  uint16_t  cnt)
{
//  Send the read slow command
SPI_SET_SS_LOW(SPI1);
SPI_WRITE_TX(SPI1,SPIFLH_CMD_READSLOW);

/* Wait ready */
while(SPI_IS_BUSY(SPI1));

//  Send the address
SPI_Flash_Send_Add(Address);

//  Read number of bytes
while(cnt)
{
      //8位，读的好像是32位？？？
      SPI_WRITE_TX(SPI1,Dummy_Byte);
      *pRamAddress++ = SPI_READ_RX(SPI1);                            // 读SPI DATA IN 数据

      /* Wait ready */
      //while(SPI_IS_BUSY(SPI1));
      cnt--;
}
SPI_SET_SS_HIGH(SPI1);

}

// *****************************************************************************
// 函数名称: uint8_t  SPI_Flash_Write_Buff
// 函数功能: 将BUFF中的数据写入到SPI Flash的指定地址
// 入口参数:
// 出口参数:
// 说明:
// *****************************************************************************
void SPI_Flash_Write_Buff(uint32_t  Address,  uint8_t  *pRamAddress,  uint16_t  cnt)
{
while(cnt)
{
      //  Send a write enable command
      SPI_SET_SS_LOW(SPI1);
      SPI_WRITE_TX(SPI1,SPIFLH_CMD_WREN);
      while(SPI_IS_BUSY(SPI1));
      SPI_SET_SS_HIGH(SPI1);

      //  Send a page program command
      SPI_SET_SS_LOW(SPI1);
      SPI_WRITE_TX(SPI1,SPIFLH_CMD_PROGRAM);
      while(SPI_IS_BUSY(SPI1));

      //  Send the address
      SPI_Flash_Send_Add(Address);

      //  Send at least one byte
      SPI_WRITE_TX(SPI1,*pRamAddress++);
      while(SPI_IS_BUSY(SPI1));
      //  Increment
      Address++;
      cnt--;
      //  Send bytes until we get to the end of a page
      while ((cnt > 0) && ((Address&0x0000ff) != 0))
      {
         SPI_WRITE_TX(SPI1,*pRamAddress++);
         while(SPI_IS_BUSY(SPI1));
         Address++;
         cnt--;
      }
      //  Deselect the chip
      SPI_SET_SS_HIGH(SPI1);
      //  Poll status until the write completes
      SPI_Flash_Read_Status();
}
}

uint8_t SPI_Flash_Erase_Sector(uint32_t Address)
{
uint8_t Status;
SPI_SET_SS_LOW(SPI1);
SPI_WRITE_TX(SPI1,SPIFLH_CMD_WREN);
while(SPI_IS_BUSY(SPI1));
SPI_SET_SS_HIGH(SPI1);

SPI_SET_SS_LOW(SPI1);
SPI_WRITE_TX(SPI1,SPIFLH_CMD_SECTORERASE);
while(SPI_IS_BUSY(SPI1));

SPI_Flash_Send_Add(Address);

SPI_SET_SS_HIGH(SPI1);
Status = SPI_Flash_Read_Status();
return Status;
}

uint8_t SPI_Flash_Read_Status(void)
{
uint8_t MEMSTAT;
do
{
      SPI_SET_SS_LOW(SPI1);
      SPI_WRITE_TX(SPI1,SPIFLH_CMD_RDSR);
      //while(SPI_IS_BUSY(SPI1));
      MEMSTAT = SPI_READ_RX(SPI1);
      //while(SPI_IS_BUSY(SPI1));
      SPI_SET_SS_HIGH(SPI1);
} while (MEMSTAT&0x01);
return MEMSTAT;
}

int main()
{       SPI1_Init();

SPI_Flash_Read_Buff(0x00,puint8_tRxBuf,sizeof(puint8_tRxBuf));
SPI_Flash_Erase_Sector(0x00);
SPI_Flash_Read_Buff(0x00,puint8_tRxBuf,sizeof(puint8_tRxBuf));
SPI_Flash_Write_Buff(0x00,puint8_tTxBuf,sizeof(puint8_tTxBuf));
SPI_Flash_Read_Buff(0x00,puint8_tRxBuf,sizeof(puint8_tRxBuf));
while(1);

}