F405 SPI读取MPU9250陀螺仪加速度的值时，MOSI一直处于高电平是怎么回事

飘花

这是代码



void SPI1_Init(void)
{         
  GPIO_InitTypeDef  GPIO_InitStructure;
  SPI_InitTypeDef  SPI_InitStructure;
       
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//ê1ÄüGPIOAê±Öó
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//ê1ÄüGPIOBê±Öó
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);//ê1ÄüSPI1ê±Öó

  //GPIOFB3,4,53õê¼»ˉéèÖÃ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;//PB3~5¸′óÃ1|Äüêä3ö       
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//¸′óÃ1|Äü
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//íÆíìêä3ö
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//100MHz
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//éÏà-
  GPIO_Init(GPIOB, &GPIO_InitStructure);//3õê¼»ˉ
       
        GPIO_PinAFConfig(GPIOB,GPIO_PinSource3,GPIO_AF_SPI1); //PB3¸′óÃÎa SPI1
        GPIO_PinAFConfig(GPIOB,GPIO_PinSource4,GPIO_AF_SPI1); //PB4¸′óÃÎa SPI1
        GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_SPI1); //PB5¸′óÃÎa SPI1
       
       
  GPIO_InitStructure.GPIO_Pin         = GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode         = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_PuPd         = GPIO_PuPd_UP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
        GPIO_SetBits(GPIOA, GPIO_Pin_15);
       
       

        //ÕaàïÖ»Õë¶ÔSPI¿ú3õê¼»ˉ
        RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,ENABLE);//¸′λSPI1
        RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,DISABLE);//í￡Ö1¸′λSPI1

        SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  //éèÖÃSPIμ￥Ïò»òÕßË«ÏòμÄêy¾YÄ￡ê½:SPIéèÖÃÎaË«ÏßË«Ïòè«Ë«1¤
        SPI_InitStructure.SPI_Mode = SPI_Mode_Master;                //éèÖÃSPI1¤×÷Ä￡ê½:éèÖÃÎaÖ÷SPI
        SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;                //éèÖÃSPIμÄêy¾Y′óD¡:SPI·￠Ëí½óêÕ8λ֡½á11
        SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;                //′®DDí¬2½ê±ÖóμÄ¿ÕÏD×′ì¬Îa¸ßμçƽ
        SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;        //′®DDí¬2½ê±ÖóμÄμú¶t¸öìø±äÑØ￡¨éÏéy»òϽμ￡©êy¾Y±»2éÑù
        SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;                //NSSDÅoÅóéó2¼t￡¨NSS1ü½Å￡©»1êÇèí¼t￡¨ê1óÃSSIλ￡©1üàí:Äú2¿NSSDÅoÅóDSSIλ¿ØÖÆ
        SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;                //¶¨òå2¨ìØÂêÔ¤·ÖÆμμÄÖμ:2¨ìØÂêÔ¤·ÖÆμÖμÎa128
        SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;        //Ö¸¶¨êy¾Y′«êä′óMSBλ»1êÇLSBλ¿aê¼:êy¾Y′«êä′óMSBλ¿aê¼
        SPI_InitStructure.SPI_CRCPolynomial = 10;        //CRCÖμ¼ÆËãμĶàÏîê½
        SPI_Init(SPI1, &SPI_InitStructure);  //¸ù¾YSPI_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèSPIx¼Ä′æÆ÷

        SPI_Cmd(SPI1, ENABLE); //ê1ÄüSPIíaéè

        SPI1_ReadWriteByte(0xff);       
}   

//SPI1 ¶áD′ò»¸ö×Ö½ú
//TxData:òaD′èëμÄ×Ö½ú
//·μ»ØÖμ:¶áè¡μ½μÄ×Ö½ú


u8 SPI1_ReadWriteByte(u8 TxData)
{                                          

  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){}//μè′y·￠ËíÇø¿Õ  
       
        SPI_I2S_SendData(SPI1, TxData); //í¨1yíaéèSPIx·￠Ëíò»¸öbyte  êy¾Y
               
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){} //μè′y½óêÕíêò»¸öbyte  

        return SPI_I2S_ReceiveData(SPI1); //·μ»Øí¨1ySPIx×î½ü½óêÕμÄêy¾Y       
                    
}

/***************************************************************/
//SPI·￠Ëí
//reg: addr
//value:êy¾Y
/***************************************************************/
u8 MPU9250_Write_Reg(u8 reg,u8 value)
{
        u8 status;
        MPU_9250_ENABLE;   //        MPU9250_CS=0;  //ƬѡMPU9250
        status=SPI1_ReadWriteByte(reg); //·￠ËíregμØÖ·
        SPI1_ReadWriteByte(value);//·￠Ëíêy¾Y
        MPU_9250_DISENABLE;//        MPU9250_CS=1;  //ê§ÄüMPU9250
        return(status);//
}

//SPI¶áè¡
//reg: addr
u8 MPU9250_Read_Reg(u8 reg)
{
          u8 reg_val;
                MPU_9250_ENABLE;//        MPU9250_CS=0;  //ƬѡMPU9250
          SPI1_ReadWriteByte(reg|0x80); //regμØÖ·+¶áÃüáî
          reg_val=SPI1_ReadWriteByte(0xff);//èÎòaêy¾Y
                MPU_9250_DISENABLE;//        MPU9250_CS=1;  //ê§ÄüMPU9250
        return(reg_val);
}



void Init_MPU9250()
{
       
        MPU9250_Write_Reg(PWR_MGMT_1, 0x80);
        delay_ms(100);
        MPU9250_Write_Reg(PWR_MGMT_1, 0x00);       
        MPU9250_Write_Reg(CONFIG, 0x07);      //μíí¨ÂË2¨ÆμÂê￡¬μäDíÖμ￡o0x07(3600Hz)′˼Ä′æÆ÷Äú¾ö¶¨Internal_Sample_Rate==8K
        MPU9250_Write_Reg(GYRO_CONFIG, 0x18); //íóÂYòÇ×Լ켰2aá¿·¶Î§￡¬μäDíÖμ￡o0x18(2»×Ô¼ì￡¬2000deg/s)
        MPU9250_Write_Reg(ACCEL_CONFIG, 0x18);//¼óËù¼Æ×Ô¼ì¡￠2aá¿·¶Î§¼°¸ßí¨ÂË2¨ÆμÂê￡¬μäDíÖμ￡o0x18(2»×Ô¼ì￡¬16G)
        MPU9250_Write_Reg(ACCEL_CONFIG_2, 0x08);//¼óËù¼Æ¸ßí¨ÂË2¨ÆμÂê μäDíÖμ ￡o0x08  ￡¨1.13kHz￡©               
        MPU9250_Write_Reg(SMPLRT_DIV, 0x07);  //íóÂYòÇ2éÑùÂê￡¬μäDíÖμ￡o0x07(1kHz) (SAMPLE_RATE= Internal_Sample_Rate / (1 + SMPLRT_DIV) )
        MPU9250_Write_Reg(INT_EN_REG,0x00);  //1رÕËùóDÖD¶Î
        MPU9250_Write_Reg(USER_CTRL_0,0x00);
        MPU9250_Write_Reg(MPU_FIFO_EN_REG,0x00);
        MPU9250_Write_Reg(INT_PIN_CFG,0x80);
        MPU9250_Write_Reg(PWR_MGMT_1,0x01);
        MPU9250_Write_Reg(PWR_MGMT_2,0x00);

}





void MPU9250_getMotion6(short *ax, short *ay, short *az, short *gx, short *gy, short *gz)
{
               
    *ax=(short)(MPU9250_Read_Reg(ACCEL_XOUT_H)<<8)| MPU9250_Read_Reg(ACCEL_XOUT_L);
                *ay=(short)(MPU9250_Read_Reg(ACCEL_YOUT_H)<<8)| MPU9250_Read_Reg(ACCEL_YOUT_L);
                *az=(short)(MPU9250_Read_Reg(ACCEL_ZOUT_H)<<8)| MPU9250_Read_Reg(ACCEL_ZOUT_L);
                *gx=(short)(MPU9250_Read_Reg(GYRO_XOUT_H)<<8) | MPU9250_Read_Reg(GYRO_XOUT_L);
                *gy=(short)(MPU9250_Read_Reg(GYRO_YOUT_H)<<8) | MPU9250_Read_Reg(GYRO_YOUT_L);
                *gz=(short)(MPU9250_Read_Reg(GYRO_ZOUT_H)<<8) | MPU9250_Read_Reg(GYRO_ZOUT_L);

}





这是逻辑分析仪的数据

飘花

有没大神啊  ，弄了一个通宵都没弄好，帮帮忙。

飘花

有人吗