求助一个stm32 usb的ad采集

只看该作者 · 2013-6-24 14:44

本帖最后由 gurong60 于 2013-6-24 16:48 编辑

现在是用spi接口的adc来采集电压，
使用usb——vcp的例程来改成自定义bluck传输。stm32作为从机，电脑接收数据
采用定时器中断100khZ来作为adc的采样率，
spi设置分频为9M.
stm32发送spi命令等待时间大概1.5us，
这样采集的数据送到usb导致usb没有响应，
但如果把spi发送命令中等待屏蔽去除，就可以传送usb数据，当然传送的数据是有误的
请问是为什么，是不是影响到usb中断了？

spi发送数据
u16 SPIx_ReadWriteByte(u16 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;
//       }
      return SPI_I2S_ReceiveData(SPI1); //返回通过SPIx最近接收的数据
}

主程序：
int main(void)
{

      SystemInit();
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1| RCC_APB2Periph_AFIO, ENABLE);                                                                                                       // 初始化时钟系统、使能相关的外围设备电源
      Set_USBClock();

      LED_config();                                                                                                 // 配置USB所用到的中断
      USB_Interrupts_Config();                                                                                              // 配置和使能USB时钟
      USB_Init();
      SPI_AD_Init();
      USART1_Config();
      TIM5_Interrupts_Config();
      TIM5_Init();

      while (1)
      {


            //       adc_out1[2]=(adc_out[1]>>8)&0x00ff;
            //       adc_out1[3]=adc_out[1]&0x00ff;

/*             while(1)
{
            USART_SendData(USART1,adc_out1[0]);
            while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET){}
            USART_SendData(USART1,adc_out1[1]);
            while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET){}
            USART_SendData(USART1,adc_out1[2]);
            while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET){}
            Delayms(2000);
            Delayms(2000);
            Delayms(2000);
            Delayms(2000);
            Delayms(2000);
            Delayms(2000);
  }

  */

            if ((count_out != 0) && (bDeviceState == CONFIGURED))
            {
                     while(1)
                     {
                              USB_SIL_Write(EP1_IN, adc_out1,64);

                     }
                     count_out==0 ;
            }
      }
}

void TIM5_Interrupts_Config(void)
{
      NVIC_InitTypeDef NVIC_InitStructure;

      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);




      /* Enable the TIM5 gloabal Interrupt */
      NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

      NVIC_Init(&NVIC_InitStructure);
}
/*******************************************************************************
* Function Name  : USB_Interrupts_Config
* Description : Configures the USB interrupts
* Input       : None.
* Return       : None.
*******************************************************************************/
void USB_Interrupts_Config(void)
{
      NVIC_InitTypeDef NVIC_InitStructure;

      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

      #ifdef STM32F10X_CL
            /* Enable the USB Interrupts */
            NVIC_InitStructure.NVIC_IRQChannel = OTG_FS_IRQn;
            NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
            NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
            NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
            NVIC_Init(&NVIC_InitStructure);
      #else
            NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
            NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
            NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
            NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
            NVIC_Init(&NVIC_InitStructure);
      #endif /* STM32F10X_CL */


}

只看该作者 · 2013-6-24 15:29

顶起

3万 · 2013-6-24 15:49

1万 · 2013-6-24 16:01

LZ能否把问题描述的清楚一些？

通过SPI读取外部ADC采样数据，然后通过USB接口发送出去？USB作为主机还是从机？什么叫做USB没有响应？你是如何操作USB的？使用ST的库还是自己操作寄存器？如果是ST的库，又是基于哪个demo？

SPI发送读取命令，应该在下一帧通过发送dummy数据来把ADC的数据读取回来。你这个1.5us的“发送spi命令等待时间”是指什么？

只看该作者 · 2013-6-24 16:49

/****************************************************************
* Function Name : SPI_FLASH_Init
* Description : Initializes the peripherals used by the SPI FLASH driver.
* Input : None
* Output : None
* Return : None
*******************************************************************/
void SPI_AD_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

/* Enable SPI1 and GPIO clocks */
/*!< SPI_FLASH_SPI_CS_GPIO, SPI_FLASH_SPI_MOSI_GPIO,
SPI_FLASH_SPI_MISO_GPIO, SPI_FLASH_SPI_DETECT_GPIO
and SPI_FLASH_SPI_SCK_GPIO Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOD,ENABLE);

/*!< SPI_FLASH_SPI Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
/*!< AFIO Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

/*!< Configure SPI_FLASH_SPI pins: SCK */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/*!< Configure SPI_FLASH_SPI pins: MISO */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/*!< Configure SPI_FLASH_SPI pins: MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/*!< Configure SPI_FLASH_SPI_CS_PIN pin: SPI_FLASH Card CS pin */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Deselect the FLASH: Chip Select high */
// SPI_FLASH_CS_HIGH();

/* SPI1 configuration */
// W25X16: data input on the DIO pin is sampled on the rising edge of the CLK.
// Data on the DO and DIO pins are clocked out on the falling edge of CLK.
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);

/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE);

}

只看该作者 · 2013-6-24 16:49

定时器中断

void TIM5_IRQHandler(void)
{

      if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET)
      {
            TIM_ClearITPendingBit(TIM5, TIM_IT_Update);
            adc_out[0]=SPIx_ReadWriteByte(0x8000);

            adc_out[1]=SPIx_ReadWriteByte(0x0000);
            adc_out1[0]=(adc_out[0]>>4)&0x00ff;
            adc_out1[1]=((adc_out[0]<<4)+(adc_out[1]>>12))&0x00ff;

      }
}