STM32单片机使用SPI控制器件,都返回值一直为0xFF -

标题: STM32单片机使用SPI控制器件,都返回值一直为0xFF [打印本页]

作者: 1123qqw 时间: 2022-10-14 19:29
标题: STM32单片机使用SPI控制器件,都返回值一直为0xFF
这个是SPI初始化代码
void SPIx_I2Cx_GPIOs_Init(void* bus_type)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
                     RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD |
                     RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO,  DISABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
                     RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD |
                     RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO,  ENABLE);

      //SPI1_NSS
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;//PA4
      GPIO_Init(GPIOA,&GPIO_InitStructure);
   //SPI1_CLK
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;//PA5
      GPIO_Init(GPIOA, &GPIO_InitStructure);
      //SPI_MISO
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;//PA6
      GPIO_Init(GPIOA, &GPIO_InitStructure);
      //SPI_MOSI
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;//PA7
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      SPI_I2S_DeInit(bus_type);

      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;//PD4
      GPIO_Init(GPIOD, &GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PD3
      GPIO_Init(GPIOD, &GPIO_InitStructure);
      // SPIx Enable = 0 for SPI Mode // SPIx Enable = RSN for GP22
      GPIO_WriteBit(GPIOD, GPIO_Pin_3, Bit_RESET);
}

void SPIx_I2Cx_Interface_Init(void* bus_type)
{
      SPI_InitTypeDef SPI_InitStructure;
      //RCC_SYSCLKConfig (RCC_SYSCLKSource_HSI);
      //RCC_HCLKConfig (RCC_SYSCLK_Div1);
      RCC_APB2PeriphResetCmd (RCC_APB2Periph_SPI1, DISABLE);
      RCC_APB2PeriphClockCmd (RCC_APB2Periph_SPI1, ENABLE);

      // All are defined in stm32f10x_spi.h
  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_Low;
  SPI_InitStructure.SPI_CPHA             = SPI_CPHA_2Edge;//
  SPI_InitStructure.SPI_NSS             = SPI_NSS_Soft;
  // SPI frequence devider
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
  SPI_InitStructure.SPI_FirstBit       = SPI_FirstBit_MSB;

  // Apply SPIx configuration
  SPI_Init(bus_type, &SPI_InitStructure);
  // Enabling the SPIx Interface
  SPI_Cmd(bus_type, ENABLE);

  // Enabling the NSS Output during transmission
//  SPI_SSOutputCmd (bus_type, ENABLE);

      GPIO_WriteBit(GPIOA, GPIO_Pin_4, Bit_SET);

}

这个是应用代码：
unsigned char Send_24Bit_Opcode(unsigned char command, unsigned short address, unsigned char data)
{

  unsigned char Result_read = 0;

  // x >> y, mean x is shifted by y bit-positions to the right
  unsigned char Byte_0  = data;
  unsigned char Byte_1  = address;
  unsigned char Byte_2  = address>>8 | command;
  // SPIx BUS_TYPE -------------------------------------------------------------

  // Deactivating Reset SPIx
  GPIO_WriteBit(GPIOA, GPIO_Pin_4, Bit_RESET);
  // GPIO_WriteBit(GPIOB, GPIO_Pin_12, Bit_RESET);

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)==0) {}
SPI_I2S_SendData(SPI1, Byte_2);    // send byte 2

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)==0) {}
SPI_I2S_SendData(SPI1, Byte_1);    // send byte 1
if (command==0x90) // write command
{
   while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)==0) {}
   SPI_I2S_SendData(SPI1, Byte_0);    // send byte 0

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)==0) {}
Simple_delay_43ns((void*)10); // important delay (16) at SPI freq.=750kHz
}

if (command==0x10) // read command
{
   while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)==RESET) {};
   Simple_delay_43ns((void*)10); // important delay (16) at SPI freq.=750kHz

   //Compulsory reads to DR and SR to clear OVR,
   //so that next incoming data is saved
   SPI_I2S_ReceiveData(SPI1);                   // To clear OVR
   SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE); // To clear OVR

   //Reading byte1
   SPI_I2S_SendData(SPI1, 0xFF);  // DUMMY WRITE
   // Wait until RX buffer is not empty, then read the received data
   while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE)==0) {}

   Result_read = SPI_I2S_ReceiveData(SPI1); //  Read
}

   // Reset to device SPIx
   GPIO_WriteBit(GPIOA, GPIO_Pin_4, Bit_SET);
   //GPIO_WriteBit(GPIOB, GPIO_Pin_12, Bit_SET);
  return Result_read;
}

Send_24Bit_Opcode(0x90,1,0x55);//0x90 写
err =  Send_24Bit_Opcode(0x10,1,0xff);//err = 0x55 0x10读
在使用的过程中，怎么弄也读不出来正确的数值，现在读出来的都是0xff。请大家看看究竟是哪出现了问题。
情景是：
用STM32控制器件，通讯使用SPI1，器件要求spi: CPOL=0;CPHA=1;MODE=1;DORD为0，MSB最先输出。

作者: adject 时间: 2022-10-14 19:29
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; 由软件控制就不需要 SPI_SSOutputCmd (bus_type, ENABLE);

作者: 1123qqw 时间: 2022-10-15 12:19

adject 发表于 2022-10-14 22:57
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; 由软件控制就不需要 SPI_SSOutputCmd (bus_typ ...

是的，我注释掉了，忘记修改了。我经过昨天测试，感觉是硬件问题，正在修改

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