STM32F103 SPI通讯读取磁编码器数值一直是FF

我有偏见 · 发表于 2020-4-6 13:33:49

oid SPI1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
  SPI_InitTypeDef  SPI_InitStructure;

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE );//PORTB时钟使能
RCC_APB2PeriphClockCmd( RCC_APB2Periph_SPI1,  ENABLE );//SPI1时钟使能
RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO, ENABLE );

/* 配置SPI的 SCK引脚GPIO_Pin_5  配置SPI的 MISO引脚GPIO_Pin_6 配置SPI的 MOSI引脚GPIO_Pin_7*/
   /* 配置SPI的 CS引脚，普通IO即可 */

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;  //SPI_NSS
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //输出模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_SetBits(GPIOA,GPIO_Pin_4);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //SPI_SCK
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6; //SPI_MISO
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  //浮空输入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;       //SPI_MOSI
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

SPI_Cmd(SPI1, DISABLE);    //必须先禁用,才能改变MODE
SPI_InitStructure.SPI_Direction =SPI_Direction_2Lines_FullDuplex; //两线全双工
SPI_InitStructure.SPI_Mode =SPI_Mode_Master; //主
SPI_InitStructure.SPI_DataSize =SPI_DataSize_8b; //8位
SPI_InitStructure.SPI_CPOL =SPI_CPOL_High; //CPOL=0
SPI_InitStructure.SPI_CPHA =SPI_CPHA_2Edge; //CPHA=0
SPI_InitStructure.SPI_NSS =SPI_NSS_Soft; //软件NSS
SPI_InitStructure.SPI_BaudRatePrescaler =SPI_BaudRatePrescaler_256; //64分频
SPI_InitStructure.SPI_FirstBit =SPI_FirstBit_MSB; //高位在前
SPI_InitStructure.SPI_CRCPolynomial =7; //CRC7
SPI_Init(SPI1,&SPI_InitStructure);

SPI_Cmd(SPI1, ENABLE); //打开SPI

}
u32 SPI_SDAD_transmission_Fun ( void)
{
u32 Temp = 0 , Temp1 = 0, Temp2 = 0 , Temp3 = 0 , Temp4 = 0,Temp5 = 0 , Temp6 = 0;;

ACTIVATE_FUN();//激活发送指令磁编码器
  /* 开始通讯：CS低电平 */
SPI_IC_MU_CS_LOW();
//delay_us(10);
Temp = SPI1_ReadWriteByte(SDAD_transmission);//SDAD_transmission

Temp1=SPI1_ReadWriteByte(Dummy_Byte);
Temp2=SPI1_ReadWriteByte(Dummy_Byte);
Temp3=SPI1_ReadWriteByte(Dummy_Byte);
Temp4=SPI1_ReadWriteByte(Dummy_Byte);
//delay_us(10);
//Temp5 = SPI1_ReadWriteByte(0xff);//启动传输
   /* 结束通讯：CS高电平*/

   SPI_IC_MU_CS_HIGH();

Temp = ((Temp1 << 16) | (Temp2 << 8) | Temp3  )>> 5 ; //读出数据，右移5位，共24位，有效位为19位

   return Temp;
}
//SPIx 读写一个字节
//TxData:要写入的字节
//返回值:读取到的字节
u8 SPI1_ReadWriteByte(u8 TxData)
{
u8 retry=0;
while (SPI_I2S_GetFlagStatus(SPI1, 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(SPI1, TxData); //通过外设SPIx发送一个数据
retry=0;

while (SPI_I2S_GetFlagStatus(SPI1, 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;
}
  SPI_I2S_ReceiveData(SPI1) ;
return SPI_I2S_ReceiveData(SPI1); //返回通过SPIx最近接收的数据
}

void ACTIVATE_FUN(void)
{
  u16 Temp = 0,  Temp1 = 0 , Temp2 = 0 ;
  SPI_IC_MU_CS_LOW();

  SPI1_ReadWriteByte(ACTIVATE);

SPI1_ReadWriteByte(0X83); //激活PACTIVE和RACTIVE

  SPI_IC_MU_CS_HIGH();

}相关程序求大佬帮忙看看哪里错了