CubeMX stm32 FreeRTOS + USB host MSC for USB Flash memory - memory

Question

Using CubeMX, TrueStudio, an STM32F767ZI, and HAL, I am developing software to access a USB Flash drive using FatFS though the USB host port.
The board has a host and device USB connector attached to the MCU.
Within CubeMX, I configured FreeRTOS, USB Host MSC, and FatFS.
This works, I can see these different states when plugging and unplugging the flash drive:
--- Plugging in USB flash drive ---
HOST_USER_CONNECTION
HOST_USER_CONNECTION
HOST_DEV_ATTACHED
phost->device.speed: 1
HOST_ENUMERATION
HOST_SET_CONFIGURATION
HOST_SET_WAKEUP_FEATURE
HOST_CHECK_CLASS
USBH_MSC_InterfaceInit
HOST_CLASS_REQUEST
USBH_MSC_ClassRequest
HOST_CLASS
USBH_MSC_Process
processId: 3, Appli_state 1
USBH_MSC_GetLUNInfo
info.capacity.block_nbr : 623395
info.capacity.block_size: 512
capacity : 3116 MB
HOST_USER_CLASS_ACTIVE
FATFS_LinkDriver Failed
USBDISKPath:
processId: 2, Appli_state 2
USBH_MSC_GetLUNInfo
info.capacity.block_nbr : 62333951
info.capacity.block_size: 512
capacity : 31166 MB
--- Unplugging USB flash drive ---
HOST_USER_DISCONNECTION
HOST_DEV_DISCONNECTED
USBH_MSC_InterfaceDeInit
processId: 5, Appli_state 3
USBH_MSC_GetLUNInfo
info.capacity.block_nbr : 62333951
info.capacity.block_size: 512
capacity : 31166 MB
So, after MX_USB_HOST_Init(); was called in freertos.c all the above happened.
FATFS_LinkDriver() is called from MX_FATFS_Init().
But the functions in usbh_diskio.c are not called, so something went wrong there.
The pieces of code I'm looking at are these:
freertos.c, where MX_USB_HOST_Init() is called, after this the MSC is registered.
/* StartDefaultTask function */
void StartDefaultTask(void const * argument)
{
/* init code for FATFS */
MX_FATFS_Init();
/* init code for LWIP */
MX_LWIP_Init();
/* init code for USB_HOST */
MX_USB_HOST_Init();
/* init code for USB_DEVICE */
MX_USB_DEVICE_Init();
/* init code for LIBJPEG */
MX_LIBJPEG_Init();
/* USER CODE BEGIN StartDefaultTask */
MSC_LUNTypeDef info;
uint8_t lun = 0;
uint16_t val = 0;
/* Infinite loop */
for(;;)
{
/* USB Host Background task */
// USBH_Process(&hUsbHostFS);
val++;
if (val >= 1000)
{
if (processIdOld != processId)
{
printf("processId: %d, Appli_state %d\n", processId, Appli_state);
processIdOld = processId;
USBH_MSC_GetLUNInfo(&hUSB_Host, lun, &info);
uint32_t cap = info.capacity.block_nbr / 2000;
printf("info.capacity.block_nbr : %ld\n", info.capacity.block_nbr);
printf("info.capacity.block_size: %d\n", info.capacity.block_size);
printf("capacity : %d MB\n", cap);
}
// printf("1");
// fflush(stdout);
// HAL_GPIO_TogglePin(PIO10_LED_RS_ERR_GPIO_Port, PIO10_LED_RS_ERR_Pin);
val = 0;
}
osDelay(1);
}
/* USER CODE END StartDefaultTask */
}
usb_host.c, where USB is initialized, and I can see USBH_UserProcess is called when I plug/unplug the USB flash drive.
void MX_USB_HOST_Init(void)
{
/* USER CODE BEGIN USB_HOST_Init_PreTreatment */
/* USER CODE END USB_HOST_Init_PreTreatment */
/* Init host Library, add supported class and start the library. */
USBH_Init(&hUsbHostFS, USBH_UserProcess, HOST_FS);
USBH_RegisterClass(&hUsbHostFS, USBH_AUDIO_CLASS);
USBH_RegisterClass(&hUsbHostFS, USBH_CDC_CLASS);
USBH_RegisterClass(&hUsbHostFS, USBH_MSC_CLASS);
USBH_RegisterClass(&hUsbHostFS, USBH_HID_CLASS);
USBH_RegisterClass(&hUsbHostFS, USBH_MTP_CLASS);
USBH_Start(&hUsbHostFS);
/* USER CODE BEGIN USB_HOST_Init_PostTreatment */
/* USER CODE END USB_HOST_Init_PostTreatment */
}
/*
* user callback definition
*/
static void USBH_UserProcess (USBH_HandleTypeDef *phost, uint8_t id)
{
/* USER CODE BEGIN CALL_BACK_1 */
switch(id)
{
case HOST_USER_SELECT_CONFIGURATION:
printf("HOST_USER_SELECT_CONFIGURATION\n");
break;
case HOST_USER_DISCONNECTION:
printf("HOST_USER_DISCONNECTION\n");
Appli_state = APPLICATION_DISCONNECT;
break;
case HOST_USER_CLASS_ACTIVE:
printf("HOST_USER_CLASS_ACTIVE\n");
Appli_state = APPLICATION_READY;
break;
case HOST_USER_CONNECTION:
printf("HOST_USER_CONNECTION\n");
Appli_state = APPLICATION_START;
break;
default:
break;
}
/* USER CODE END CALL_BACK_1 */
}
The above part works fine, sofar.
Except the linking of the usbh driver.
Has anybody used this or know good working examples?