SPI读取FLASHID

只看该作者 · 2019-11-28 20:42

void SPI_Flash_Init(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

SPI_InitTypeDef SPI_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;                               //CS

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;

GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;                            //SCLK

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;          //MOSI

GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;          //MISO

GPIO_Init(GPIOA,&GPIO_InitStructure);

  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_4;

  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

  SPI_InitStructure.SPI_CRCPolynomial = 7;

  SPI_Init(SPI1, &SPI_InitStructure);

SPI_Cmd(SPI1,ENABLE);

GPIO_SetBits(GPIOA, GPIO_Pin_4);                                     //关闭FLASH

int main(void)

{

   u8  temp=0;

   SPI_Flash_Init();

   GPIO_ResetBits(GPIOA, GPIO_Pin_4);                                                                         //开FLASH

   while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

   SPI_I2S_SendData(SPI1, 0xAB);

   while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

   SPI_I2S_SendData(SPI1, 0xFF);

   while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

   SPI_I2S_SendData(SPI1, 0xFF);

   while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

   SPI_I2S_SendData(SPI1, 0xFF);

   while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

   temp =  SPI_I2S_ReceiveData(SPI1);                                                                         //读取返回值

   GPIO_SetBits(GPIOA, GPIO_Pin_4);                                                                            //关FLASH

}

我是按照FLASH的时序做的，为什么读不到ID呢?读出来的都是FF，请各位帮我看看，谢谢

SPI读取FLASHID

相关帖子