Issue with Custom HID Device Using Multiple IN Endpoints on STM32L072CB

[jhs1205]

Sure, here is the translation of your query in a polite tone:

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I am using an STM32L072CB to validate an HID device and I want to switch between Input Reports based on the PC settings, using different Endpoints. However, after sending the Input Report to the newly added Endpoint, I encounter a CUSTOM_HID_BUSY issue which is not resolved, and the callback is not invoked. This suggests that the PC cannot properly handle the transmission through the newly added Endpoint. I suspect there might be mistakes or missing parts in the initial device configuration.

Below is my main code:

USBD_StatusTypeDef USBD_LL_Init(USBD_HandleTypeDef *pdev)

{
/* Init USB Ip. */
/* Link the driver to the stack. */
hpcd_USB_FS.pData = pdev;
pdev->pData = &hpcd_USB_FS;

hpcd_USB_FS.Instance = USB;
hpcd_USB_FS.Init.dev_endpoints = 8;
hpcd_USB_FS.Init.speed = PCD_SPEED_FULL;
hpcd_USB_FS.Init.phy_itface = PCD_PHY_EMBEDDED;
hpcd_USB_FS.Init.low_power_enable = DISABLE;
hpcd_USB_FS.Init.lpm_enable = DISABLE;
hpcd_USB_FS.Init.battery_charging_enable = DISABLE;
if (HAL_PCD_Init(&hpcd_USB_FS) != HAL_OK)
{
Error_Handler( );
}

#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
/* Register USB PCD CallBacks */
HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_SOF_CB_ID, PCD_SOFCallback);
HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_SETUPSTAGE_CB_ID, PCD_SetupStageCallback);
HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_RESET_CB_ID, PCD_ResetCallback);
HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_SUSPEND_CB_ID, PCD_SuspendCallback);
HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_RESUME_CB_ID, PCD_ResumeCallback);
HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_CONNECT_CB_ID, PCD_ConnectCallback);
HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_DISCONNECT_CB_ID, PCD_DisconnectCallback);

HAL_PCD_RegisterDataOutStageCallback(&hpcd_USB_FS, PCD_DataOutStageCallback);
HAL_PCD_RegisterDataInStageCallback(&hpcd_USB_FS, PCD_DataInStageCallback);
HAL_PCD_RegisterIsoOutIncpltCallback(&hpcd_USB_FS, PCD_ISOOUTIncompleteCallback);
HAL_PCD_RegisterIsoInIncpltCallback(&hpcd_USB_FS, PCD_ISOINIncompleteCallback);
#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
/* USER CODE BEGIN EndPoint_Configuration */
HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , 0x00 , PCD_SNG_BUF, 0x18);//Endpoint0
HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , 0x80 , PCD_SNG_BUF, 0x58);//Endpoint0
/* USER CODE END EndPoint_Configuration */
/* USER CODE BEGIN EndPoint_Configuration_CUSTOM_HID */
HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , CUSTOM_HID_EPIN_ADDR , PCD_SNG_BUF, 0x98);//Endpoint1-IN
HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , CUSTOM_HID_EPOUT_ADDR , PCD_SNG_BUF, 0xD8);//Endpoint1-OUT
HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , CUSTOM_HID_EPIN2_ADDR , PCD_SNG_BUF, 0x118);//Endpoint2-IN add
/* USER CODE END EndPoint_Configuration_CUSTOM_HID */
return USBD_OK;
}

"The newly added OUT endpoint is for temporary testing purposes and will not be used, so it is not configured in HAL_PCDEx_PMAConfig." 

uint8_t USBD_CUSTOM_HID_SendReport(USBD_HandleTypeDef  *pdev,

                                   uint8_t *report,

                                   uint16_t len)

{

  USBD_CUSTOM_HID_HandleTypeDef     *hhid = (USBD_CUSTOM_HID_HandleTypeDef *)pdev->pClassData;

  if (pdev->dev_state == USBD_STATE_CONFIGURED)

  {

    if (hhid->state == CUSTOM_HID_IDLE)

    {

      hhid->state = CUSTOM_HID_BUSY;

      //USBD_LL_Transmit(pdev, CUSTOM_HID_EPIN_ADDR, report, len);

      if(report[0] == 0x3)

      USBD_LL_Transmit(pdev, CUSTOM_HID_EPIN_ADDR, report, len); //CUSTOM_HID_EPIN_ADDR 0x81

      else

      USBD_LL_Transmit(pdev, CUSTOM_HID_EPIN2_ADDR, report, len); //CUSTOM_HID_EPIN2_ADDR 0x82

}

    else

    {

      return USBD_BUSY;

    }

  }

  return USBD_OK;

}

/* USB CUSTOM_HID device FS Configuration Descriptor */
__ALIGN_BEGIN static uint8_t USBD_CUSTOM_HID_CfgFSDesc[USB_CUSTOM_HID_CONFIG_DESC_SIZ] __ALIGN_END =
{
0x09, /* bLength: Configuration Descriptor size */
USB_DESC_TYPE_CONFIGURATION, /* bDescriptorType: Configuration */
USB_CUSTOM_HID_CONFIG_DESC_SIZ,
/* wTotalLength: Bytes returned */
0x00,
0x01, /*bNumInterfaces: 1 interface*/
0x01, /*bConfigurationValue: Configuration value*/
0x00, /*iConfiguration: Index of string descriptor describing
the configuration*/
0xC0, /*bmAttributes: bus powered */
0x32, /*MaxPower 100 mA: this current is used for detecting Vbus*/

/************** Descriptor of CUSTOM HID interface ****************/
/* 09 */
0x09, /*bLength: Interface Descriptor size*/
USB_DESC_TYPE_INTERFACE,/*bDescriptorType: Interface descriptor type*/
0x00, /*bInterfaceNumber: Number of Interface*/
0x00, /*bAlternateSetting: Alternate setting*/
0x03, //0x02, /*bNumEndpoints*/
0x03, /*bInterfaceClass: CUSTOM_HID*/
0x00, /*bInterfaceSubClass : 1=BOOT, 0=no boot*/
0x00, /*nInterfaceProtocol : 0=none, 1=keyboard, 2=mouse*/
0, /*iInterface: Index of string descriptor*/
/******************** Descriptor of CUSTOM_HID *************************/
/* 18 */
0x09, /*bLength: CUSTOM_HID Descriptor size*/
CUSTOM_HID_DESCRIPTOR_TYPE, /*bDescriptorType: CUSTOM_HID*/
0x11, /*bCUSTOM_HIDUSTOM_HID: CUSTOM_HID Class Spec release number*/
0x01,
0x00, /*bCountryCode: Hardware target country*/
0x01, /*bNumDescriptors: Number of CUSTOM_HID class descriptors to follow*/
0x22, /*bDescriptorType*/
USBD_CUSTOM_HID_REPORT_DESC_SIZE,/*wItemLength: Total length of Report descriptor*/
0x00,
/******************** Descriptor of Custom HID endpoints ********************/
/* 27 */
0x07, /*bLength: Endpoint Descriptor size*/
USB_DESC_TYPE_ENDPOINT, /*bDescriptorType:*/

CUSTOM_HID_EPIN_ADDR, /*bEndpointAddress: Endpoint Address (IN)*/
0x03, /*bmAttributes: Interrupt endpoint*/
CUSTOM_HID_EPIN_SIZE, /*wMaxPacketSize: 2 Byte max */
0x00,
CUSTOM_HID_FS_BINTERVAL, /*bInterval: Polling Interval */
/* 34 */

0x07, /* bLength: Endpoint Descriptor size */
USB_DESC_TYPE_ENDPOINT, /* bDescriptorType: */
CUSTOM_HID_EPOUT_ADDR, /*bEndpointAddress: Endpoint Address (OUT)*/
0x03, /* bmAttributes: Interrupt endpoint */
CUSTOM_HID_EPOUT_SIZE, /* wMaxPacketSize: 2 Bytes max */
0x00,
CUSTOM_HID_FS_BINTERVAL, /* bInterval: Polling Interval */
/* 41 */
#if 1
/* add new IN endpoint */
0x07, /* bLength: Endpoint Descriptor size */
USB_DESC_TYPE_ENDPOINT, /* bDescriptorType: */
CUSTOM_HID_EPIN2_ADDR, /*bEndpointAddress: 새로운 IN 엔드포인트 주소*/
0x03, /* bmAttributes: Interrupt endpoint */
CUSTOM_HID_EPIN2_SIZE, /* wMaxPacketSize: 2 Bytes max */
0x00,
CUSTOM_HID_FS_BINTERVAL, /* bInterval: Polling Interval */
/* 48 */

/* add new OUT endpoint */
0x07, /* bLength: Endpoint Descriptor size */
USB_DESC_TYPE_ENDPOINT, /* bDescriptorType: */
CUSTOM_HID_EPOUT2_ADDR, /*bEndpointAddress: 새로운 IN 엔드포인트 주소*/
0x03, /* bmAttributes: Interrupt endpoint */
CUSTOM_HID_EPOUT2_SIZE, /* wMaxPacketSize: 2 Bytes max */
0x00,
CUSTOM_HID_FS_BINTERVAL, /* bInterval: Polling Interval */
/* 55 */
#endif
};

Could you please help me identify if there are any mistakes or additional configurations needed for the device to function correctly with the newly added IN Endpoint? Thank you in advance for your assistance.

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I hope this translation helps you in getting the required assistance from the ST Community.

[jhs1205]

My device operates as a touchscreen. Endpoint address 0x81 successfully triggers touch events on Windows, and I am trying to use 0x82 to transmit data to the program. I configured different report IDs for each and branched the transmission function to use the respective endpoints. However, when sending reports to the added 0x82 endpoint, the CUSTOM_HID_BUSY state of hhid does not clear (it seems that the input report is sent, but there is no response from the PC, as the callback is not invoked).

I would like to know more about the USB configuration aspects I should pay attention to in order to resolve this issue.