stm32f429 usb msc enumeration fails in FS mode connected at FS pins.

[saochandan]

Posted on September 09, 2015 at 09:02

Hi.

Using STM32Cube_FW_F4_V1.6.0 demonstration code for STM32F429I-Disco board, in which USBH is configured to operate in full speed mode on HS pins.I am having custom board where USB MSC device is interfaced with FS pins (DM-PA11, DP-PA12, VBUS-PA9 and USB-ID/USB-OC pins are connected but not configured for now). There is a enable pin at PC6 connected to /EN pin of STMPS2161STR.Now, I have modified the demo code in usb_conf.c file as below.&sharpdefine HOST_POWERSW_PORT                 GPIOC&sharpdefine HOST_POWERSW_VBUS                 GPIO_PIN_6/* Private variables ---------------------------------------------------------*/HCD_HandleTypeDef hhcd;void HAL_HCD_MspInit(HCD_HandleTypeDef *hhcd){  /* On STM32F429I-DISCO, USB OTG HS Core will operate in Full speed mode */  GPIO_InitTypeDef  GPIO_InitStruct;    /*EMBEDDED Physical interface*/  __HAL_RCC_GPIOA_CLK_ENABLE();  __HAL_RCC_GPIOC_CLK_ENABLE();    GPIO_InitStruct.Pin = (GPIO_PIN_11 | GPIO_PIN_12);  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;  GPIO_InitStruct.Pull = GPIO_NOPULL;  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);     /* Configure  VBUS Pin */  GPIO_InitStruct.Pin = GPIO_PIN_9;  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;  GPIO_InitStruct.Pull = GPIO_NOPULL;  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);        /* Enable USB HS Clocks */   __HAL_RCC_USB_OTG_FS_CLK_ENABLE();    /* Configure Power Switch Vbus Pin */  GPIO_InitStruct.Pin = HOST_POWERSW_VBUS;  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;  GPIO_InitStruct.Pull = GPIO_NOPULL;  HAL_GPIO_Init(HOST_POWERSW_PORT,&GPIO_InitStruct);    /* By Default, DISABLE is needed on output of the Power Switch */  HAL_GPIO_WritePin(HOST_POWERSW_PORT, HOST_POWERSW_VBUS, GPIO_PIN_SET);    USBH_Delay(200);   /* Delay is need for stabilising the Vbus Low */    /* Set USBHS Interrupt to the lowest priority */  HAL_NVIC_SetPriority(OTG_FS_IRQn, 5, 0);    /* Enable USBFS Interrupt */  HAL_NVIC_EnableIRQ(OTG_FS_IRQn);}void HAL_HCD_MspDeInit(HCD_HandleTypeDef *hhcd){  /* Disable USB HS Clocks */   __HAL_RCC_USB_OTG_FS_CLK_DISABLE();}USBH_StatusTypeDef USBH_LL_Init(USBH_HandleTypeDef *phost){    /*Set LL Driver parameters */  hhcd.Instance = USB_OTG_FS;  hhcd.Init.Host_channels = 7;   hhcd.Init.dma_enable = 1;  hhcd.Init.low_power_enable = 0;  hhcd.Init.phy_itface = HCD_PHY_EMBEDDED;   hhcd.Init.Sof_enable = 0;  hhcd.Init.speed = HCD_SPEED_FULL;  hhcd.Init.use_external_vbus = 1;    /* Link The driver to the stack */  hhcd.pData = phost;  phost->pData = &hhcd;  /*Initialize LL Driver */  if (HAL_HCD_Init(&hhcd) != HAL_OK)  {    return USBH_FAIL;  }    USBH_LL_SetTimer (phost, HAL_HCD_GetCurrentFrame(&hhcd));    return USBH_OK;}and in stm32f4xx_it.c file.void OTG_FS_IRQHandler(void){  HAL_HCD_IRQHandler(&hhcd);}Now, the result is:in usb_core.c USBH_Process(), it doesn't pass this condition. It always shows USBH_BUSY. During this process, pulses are observed at DM and DP pins.case HOST_ENUMERATION:         /* Check for enumeration status */      if ( USBH_HandleEnum(phost) == USBH_OK)    { 

      /* The function shall return USBH_OK when full enumeration is complete */

      USBH_UsrLog (''Enumeration done.'');In interrupt part, upon connecting USB Device it shows SOF interrupt.This project is based on FreeRTOS.What could be the possible reasons for this? Kindly help.Thanks,Chandan #enumeration #stm32f29 #usbmsc

[saochandan]

Posted on September 09, 2015 at 12:28

upon setting hhcd.Init.dma_enable = 0;

it works. I spend 3-4 days to find out this. But still in doubt, how this caused the problem.