embedded - STM32F769NI USB CDC主机发送简单数据到设备的问题(STM32F769NI USB CDC host problem sending simple data to the device)

Question

I am making HID for some data acquisition system.

(我正在为某些数据采集系统制作HID。)

There are a lot of sensors who store test data and when I need I get to them and connect via USB and take it.

(有很多传感器可以存储测试数据，当我需要时，我可以通过USB连接并获取数据。)

USB host sent 3 bytes and USB device, if bytes are correct, sends its stored data.

(USB主机发送3个字节，如果字节正确，USB设备将发送其存储的数据。)

Sounds simple.

(听起来很简单。)

Previously it was implemented on PC, but now I try to implement it on STM32F769 Discovery and have some serious problems.

(以前它是在PC上实现的，但是现在我尝试在STM32F769 Discovery上实现它，并且有一些严重的问题。)

I am using ARM Keil 5.27, code generated with STM32CubeMX 5.3.0.

(我正在使用ARM Keil 5.27，它是用STM32CubeMX 5.3.0生成的代码。)

I tried just to make a plain simple program, later to integrate with the entire touchscreen interface.

(我只是尝试制作一个简单的简单程序，然后与整个触摸屏界面集成。)

I tried to implement this code in main:

(我试图在main中实现此代码：)

if (HAL_GPIO_ReadPin(BUTTON_GPIO_Port, BUTTON_Pin))
    while (HAL_GPIO_ReadPin(BUTTON_GPIO_Port, BUTTON_Pin))
    {
        Transmission_function();
    }

And the function itself:

(函数本身：)

uint8_t tx_buf[]={DLE, STX, 120}, RX_FLAG;
uint32_t size_tx=sizeof(tx_buf);
void Transmission_function (void)
{
    if (Appli_state == APPLICATION_READY)
    {
        i=0;
        USBH_CDC_Transmit(&hUsbHostHS, tx_buf, size_tx);
        HAL_Delay(50);
        RX_FLAG=0;
    }
}

It should send the message after I press the blue button on the Discovery board.

(我按发现板上的蓝色按钮后，它应该发送消息。)

All that I get is Hard Fault.

(我得到的只是硬故障。)

While trying to debug, I tried manually to check after which action I get this error and it was functioning in stm32f7xx_ll_usb.c:

(尝试调试时，我尝试手动检查执行此错误后执行的操作，该错误在stm32f7xx_ll_usb.c中起作用：)

HAL_StatusTypeDef USB_WritePacket(USB_OTG_GlobalTypeDef *USBx, uint8_t *src, 
uint8_t ch_ep_num, uint16_t len, uint8_t dma)
{
   uint32_t USBx_BASE = (uint32_t)USBx;
   uint32_t *pSrc = (uint32_t *)src;
   uint32_t count32b, i;

   if (dma == 0U)
   {
      count32b = ((uint32_t)len + 3U) / 4U;
      for (i = 0U; i < count32b; i++)
      {
          USBx_DFIFO((uint32_t)ch_ep_num) = *((__packed uint32_t *)pSrc);
          pSrc++;
      }
   }

   return HAL_OK;
}

But trying to scroll back in disassembly I notice, that just before Hard Fault program was in this function inside stm32f7xx_hal_hcd.c, in case GRXSTS_PKTSTS_IN:

(但是我尝试反汇编时回滚，发现在Hard Fault程序在stm32f7xx_hal_hcd.c中的此函数中之前，以防GRXSTS_PKTSTS_IN：)

static void HCD_RXQLVL_IRQHandler(HCD_HandleTypeDef *hhcd)
{
    USB_OTG_GlobalTypeDef *USBx = hhcd->Instance;
    uint32_t USBx_BASE = (uint32_t)USBx;
    uint32_t pktsts;
    uint32_t pktcnt;
    uint32_t temp;
    uint32_t tmpreg;
    uint32_t ch_num;

    temp = hhcd->Instance->GRXSTSP;
    ch_num = temp & USB_OTG_GRXSTSP_EPNUM;
    pktsts = (temp & USB_OTG_GRXSTSP_PKTSTS) >> 17;
    pktcnt = (temp & USB_OTG_GRXSTSP_BCNT) >> 4;

    switch (pktsts)
    {
        case GRXSTS_PKTSTS_IN:
            /* Read the data into the host buffer. */
            if ((pktcnt > 0U) && (hhcd->hc[ch_num].xfer_buff != (void *)0))
            {
                (void)USB_ReadPacket(hhcd->Instance, hhcd->hc[ch_num].xfer_buff, (uint16_t)pktcnt);

                /*manage multiple Xfer */
                hhcd->hc[ch_num].xfer_buff += pktcnt;
                hhcd->hc[ch_num].xfer_count  += pktcnt;

                if ((USBx_HC(ch_num)->HCTSIZ & USB_OTG_HCTSIZ_PKTCNT) > 0U)
                {
                    /* re-activate the channel when more packets are expected */
                    tmpreg = USBx_HC(ch_num)->HCCHAR;
                    tmpreg &= ~USB_OTG_HCCHAR_CHDIS;
                    tmpreg |= USB_OTG_HCCHAR_CHENA;
                    USBx_HC(ch_num)->HCCHAR = tmpreg;
                    hhcd->hc[ch_num].toggle_in ^= 1U;
                }
            }
            break;

        case GRXSTS_PKTSTS_DATA_TOGGLE_ERR:
            break;

        case GRXSTS_PKTSTS_IN_XFER_COMP:
        case GRXSTS_PKTSTS_CH_HALTED:
        default:
            break;
    }
}

Last few lines from Dissasembly shows this: 0x080018B4 E8BD81F0 POP {r4-r8,pc} 0x080018B8 0000 DCW 0x0000 0x080018BA 1FF8 DCW 0x1FF8

(Dissasembly的最后几行显示如下：0x080018B4 E8BD81F0 POP {r4-r8，pc} 0x080018B8 0000 DCW 0x0000 0x080018BA 1FF8 DCW 0x1FF8)

Why it fails?

(为什么失败？)

How could I fix it?

(我该如何解决？)

I do not have much experience with USB protocol.

(我对USB协议没有太多经验。)

  ask by Random_Person translate from so

Answer 1

等待大神答复