请教SPI读取W25Q128的ID值始终不正确

shunshunfei · 发表于 2022-3-10 18:24:36

本帖最后由 shunshunfei 于 2022-3-10 18:27 编辑

代码
#include "SPI.h"

void SPI_Config(void)
{
      GPIO_InitTypeDef GPIO_InitStruct;
      SPI_InitTypeDef  SPI_InitStruct;

      //使能SPI时钟
      SPI_APBxClock (SPI_CLK,ENABLE);
      //使能SPI引脚相关的引脚时钟
      RCC_APB2PeriphClockCmd(SPI_CS_CLK|SPI_SCK_CLK|SPI_MISO_CLK|SPI_MOSI_CLK ,ENABLE);
      //配置SPI_CLK的引脚
      GPIO_InitStruct.GPIO_Mode= GPIO_Mode_AF_PP;
      GPIO_InitStruct.GPIO_Pin=SPI_SCK_PIN;
      GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
      GPIO_Init(SPI_SCK_PORT,&GPIO_InitStruct);
      //配置SPI_MOSI的引脚
      GPIO_InitStruct.GPIO_Pin=SPI_MOSI_PIN;
      GPIO_Init(SPI_MOSI_PORT,&GPIO_InitStruct);
      //配置SPI_MISO的引脚

      GPIO_InitStruct.GPIO_Pin=SPI_MISO_PIN;
      GPIO_Init(SPI_MISO_PORT,&GPIO_InitStruct);

      //配置SPI_CS的引脚
      GPIO_InitStruct.GPIO_Mode= GPIO_Mode_Out_PP;
      GPIO_InitStruct.GPIO_Pin=SPI_CS_PIN;
      GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
      GPIO_Init(SPI_CS_PORT,&GPIO_InitStruct);

      //配置SPI的模式
      SPI_InitStruct.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_256;
      SPI_InitStruct.SPI_CPHA=SPI_CPHA_2Edge;
      SPI_InitStruct.SPI_CPOL= SPI_CPOL_High;
      SPI_InitStruct.SPI_CRCPolynomial=7;
      SPI_InitStruct.SPI_DataSize=SPI_DataSize_8b;
      SPI_InitStruct.SPI_Direction=SPI_Direction_2Lines_FullDuplex;
      SPI_InitStruct.SPI_FirstBit=SPI_FirstBit_MSB;
      SPI_InitStruct.SPI_Mode=SPI_Mode_Master;
      SPI_InitStruct.SPI_NSS=SPI_NSS_Soft;
      SPI_Init(SPIx,&SPI_InitStruct);

      SPI_Cmd(SPIx,ENABLE);
}

//收发一个字节数据
uint8_t SPI_Flash_WR_Byte(uint8_t data)
{
      uint16_t SPI_wait_time=wait_time;
      while(SPI_I2S_GetFlagStatus(SPIx,SPI_I2S_FLAG_TXE)==RESET)
      {
            if((SPI_wait_time--)==0)
            {
                     return Wait_Time_Callback(0);
            }
      }
      SPI_wait_time=wait_time;
      SPI_I2S_SendData(SPIx,data);
      while(SPI_I2S_GetFlagStatus(SPIx,SPI_I2S_FLAG_RXNE)==RESET)
      {
            if((SPI_wait_time--)==0)
            {
                     return Wait_Time_Callback(1);
            }
      }
      return SPI_I2S_ReceiveData(SPIx);
}

//读取FLASH的ID号
uint32_t Read_SPI_ID(void)
{
      uint32_t FLASH_ID=0;
      SPI_CS_LOW();
      SPI_Flash_WR_Byte(W25X_JedecDeviceID);
      FLASH_ID=SPI_Flash_WR_Byte(Dummy_Byte);
      FLASH_ID<<=8;
      FLASH_ID|=SPI_Flash_WR_Byte(Dummy_Byte);
      FLASH_ID<<=8;
      FLASH_ID|=SPI_Flash_WR_Byte(Dummy_Byte);
      SPI_CS_HIGH();
      return FLASH_ID;
}
uint8_t Wait_Time_Callback(uint8_t errorCode)
{
  //等待超时后的处理,输出错误信息
  printf("SPI 等待超时!errorCode = %d",errorCode);
  return 0;
}

#include "stm32f10x.h"
#include "SPI.h"
int main(void)
{
      uint32_t ID=0;
      SPI_Config();
      usartconfig();
      printf("这是一个SPI实验：\n");
      ID=Read_SPI_ID();
      printf("ID=0x%x\n",ID);
      while(1)
      {
      }
}
串口输出结果
ID=0x522118