USB_host MSC with stm32f746

[RMasi.19]

Hi, after of much struggle in the programming, seeing the tutorial of controllers_tech, can create files and directories in usb memory. I had problems with these case, when insert the usb memory the flow of program enter in Application_Start but never went to Application_Ready. 

case HOST_USER_CONNECTION:

Appli_state = APPLICATION_START;

break;

case HOST_USER_CLASS_ACTIVE:

Appli_state = APPLICATION_READY;

Mount_USB();

...

break;

Then seeing some thereads about these problem, found that the file usbh_ctlreq.c have these lines:

if (USBH_MAX_EP_PACKET_SIZE < (uint16_t)USBH_MAX_DATA_BUFFER)

{

/* Make sure that maximum packet size (bits 0..10) does not exceed the max endpoint packet size */

ep_descriptor->wMaxPacketSize &= ~0x7FFU;

ep_descriptor->wMaxPacketSize |= MIN((uint16_t)(LE16(buf + 4) & 0x7FFU), (uint16_t)USBH_MAX_EP_PACKET_SIZE);

}

else

{

/* Make sure that maximum packet size (bits 0..10) does not exceed the total buffer length */

ep_descriptor->wMaxPacketSize &= ~0x7FFU;

ep_descriptor->wMaxPacketSize |= USBH_MAX_EP_PACKET_SIZE;

}

the flow of program always falls in condition else, then i increased the size of USBH_MAX_DATA_BUFFER, in .ioc file Usb_host middleware, of 512 a 2048 bytes, then the flow of program entered in the first condition.

and flow program can now enter a Application_Ready. Some users say what error bug in these lines, i want know if these is true and what meaning have these two constans
USBH_MAX_EP_PACKET_SIZE < (uint16_t)USBH_MAX_DATA_BUFFER

[KDJEM.1]

Hello @RMasi.19 ,

Thank you for reporting this issue.

This issue is already reported internally. It is a bug in host lib v3.4.1 integrated in STM32CubeF7 1.17.0 version.

This issue is fixed on host lib v3.5.0 available in ST github.

Internal ticket number: 136958 (This is an internal tracking number and is not accessible or usable by customers).

Thank you.

Kaouthar