Posted on April 19, 2016 at 18:00
Hi,
I'm using an STm32F107 and I trie to configure the USB interface as host to access to an key.
This is the initialization code :
MX_USB_HOST_Init();
MX_FATFS_Init();
with :
void MX_USB_HOST_Init(void)
{
/* Init Host Library,Add Supported Class and Start the library*/
USBH_Init(&hUsbHostFS, USBH_UserProcess, HOST_FS);
USBH_RegisterClass(&hUsbHostFS, USBH_MSC_CLASS);
USBH_Start(&hUsbHostFS);
}
and :
void MX_FATFS_Init(void)
{
/*## FatFS: Link the USBH driver ###########################*/
retUSBH = FATFS_LinkDriver(&USBH_Driver, USBH_Path);
/* USER CODE BEGIN Init */
/* additional user code for init */
if (retUSBH == 0)
{
HAL_GPIO_WritePin(GPIOD, LED1_Pin, GPIO_PIN_SET);//Succes
}
else
{
HAL_GPIO_WritePin(GPIOD, LED3_Pin, GPIO_PIN_SET);//Error
}
/* USER CODE END Init */
}
After execute, the led1 is on.
A try to access to
/* Register the file system object to the FatFs module */
if (f_mount(&USBH_fatfs, '''', 0) != FR_OK)
{
/* ERROR : Cannot Initialize FatFs. */
...
}
This call to function ''
f_mount()''
always returns FR_OK
but after :
while (1)
{
/* USER CODE END WHILE */
MX_USB_HOST_Process();
/* USER CODE BEGIN 3 */
HAL_Delay(500);
res = f_open(&MyFile, ''0:USBHost.txt'', FA_CREATE_ALWAYS | FA_WRITE);
if (res != FR_OK)
{
// Error
// ...
}
...
}
Here, the function ''
f_open()''
never returns
FR_OK.
Is there someone who can give me some explanation of this behaviour ?
Thank you very much.
Bernard.
#stm32-usb-otg-msc
