返回总是0xFFFF

1万 · 2022-6-11 13:55

使用STM32L151的SPI2读取W25Q16的ID错误，返回总是0xFFFF

1万 · 2022-6-11 13:58

楼主程序可以公开吗？贴程序看下吧，这么说看不出什么原因

1万 · 2022-6-11 14:00

void SPI2_Init(void)

{

  SPI_InitTypeDef  SPI_InitStructure;

  GPIO_InitTypeDef GPIO_InitStructure;

////SPI Set PB13,14,15 as Output push-pull - SCK, MISO and MOSI

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);

/* 使能SPI引脚相关的时钟 */

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB,ENABLE);

/*指令IO的复用功能*/

   GPIO_PinAFConfig(GPIOB, GPIO_PinSource13,GPIO_AF_SPI2);

  GPIO_PinAFConfig(GPIOB, GPIO_PinSource14,GPIO_AF_SPI2);

  GPIO_PinAFConfig(GPIOB, GPIO_PinSource15,GPIO_AF_SPI2);

/*  SCK、MOSI、MISO */

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;

  GPIO_InitStructure.GPIO_Mode =  GPIO_Mode_AF;  //复用

  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽

  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;

  GPIO_Init(GPIOB,&GPIO_InitStructure);

      /* SPI2 configuration */

      SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

      SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

      SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

      SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;

      SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;

      SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

      SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;

      SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

      SPI_InitStructure.SPI_CRCPolynomial = 7;

      SPI_Init(SPI2, &SPI_InitStructure);

      /* Enable SPI2  */

      SPI_Cmd(SPI2, ENABLE);



      SPI2_ReadWriteByte(0xff);

}

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//SPIx 读写一个字节

//TxData:要写入的字节

//返回值:读取到的字节

uint8_t SPI2_ReadWriteByte(uint8_t TxData)

{

uint8_t retry=0;

while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET) //检查指定的SPI标志位设置与否:发送缓存空标志位

  {

  retry++;

  if(retry>200)return 0;

  }

SPI_I2S_SendData(SPI2, TxData); //通过外设SPIx发送一个数据

retry=0;

while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET) //检查指定的SPI标志位设置与否:接受缓存非空标志位

  {

  retry++;

  if(retry>200)return 0;

  }

return SPI_I2S_ReceiveData(SPI2); //返回通过SPIx最近接收的数据

}

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//读取芯片ID

//返回值如下:

//0XEF13,表示芯片型号为W25Q80

//0XEF14,表示芯片型号为W25Q16

//0XEF15,表示芯片型号为W25Q32

//0XEF16,表示芯片型号为W25Q64

//0XEF17,表示芯片型号为W25Q128

uint16_t W25QXX_ReadID(void)

{

uint16_t Temp = 0;

GPIO_ResetBits(GPIOB,GPIO_Pin_12);

SPI2_ReadWriteByte(0x90);//发送读取ID命令

SPI2_ReadWriteByte(0x00);

SPI2_ReadWriteByte(0x00);

SPI2_ReadWriteByte(0x00);

Temp|=SPI2_ReadWriteByte(0x00)<<8;

Temp|=SPI2_ReadWriteByte(0x00);

GPIO_SetBits(GPIOB,GPIO_Pin_12);

return Temp;

}