Posted on September 21, 2017 at 17:00Hi,
i am working on a similar device, which logs GPS data on a SD Card. On my PCB the GPS USB Port and the STM32L073 USB can be connected via a USB HUB IC together to the PC. When connecting my Data Logger to the PC, MSC & GPS are available and accessible. This part works fine.
I also can eject the MSC by pushing a button while GPS is still connected.
What not works is remount the MSC – Windows connection after the next button push.
Basically I want to switch mode Mount and Eject every time I push the button without unplug the cable.
Until now I had a different approach as David who started this Discussion. I start the USB on a interrupt driven event with:
void
MX_USB_DEVICE_Init_aw(void)
{
/*
Init
Device Library,Add Supported Class and Start the library*/ USBD_Init(&hUsbDeviceFS, &FS_Desc, DEVICE_FS);
USBD_RegisterClass(&hUsbDeviceFS, &USBD_MSC);
USBD_MSC_RegisterStorage(&hUsbDeviceFS, &USBD_Storage_Interface_fops_FS);
USBD_Start(&hUsbDeviceFS);
}
After all work is done with MSC do eject the MSC.
Ejecting the MSC as in USB Documentation UM1734 (DocID025934) page 24/25 proposed I call:
void
MX_USB_DEVICE_deInit_aw(void)
{
//USBD_MSC_DeInit(&hUsbDeviceFS, 0);
USBD_DeInit(&hUsbDeviceFS);
// USBD_Stop(&hUsbDeviceFS);
}
Restarting the USB on the next event (which does not work) I would call:
void
MX_USB_DEVICE_reset_aw(void)
{
USBD_LL_Reset(&hUsbDeviceFS);
}
And again:
void
MX_USB_DEVICE_Init_aw(void)
{
/*
Init
Device Library,Add Supported Class and Start the library*/ USBD_Init(&hUsbDeviceFS, &FS_Desc, DEVICE_FS);
USBD_RegisterClass(&hUsbDeviceFS, &USBD_MSC);
USBD_MSC_RegisterStorage(&hUsbDeviceFS, &USBD_Storage_Interface_fops_FS);
USBD_Start(&hUsbDeviceFS);
}
So restarting doesn’t work. Can someone tell me, if my approach is somehow correct? I think I just miss to reset some USB registers, or . I got this working on a PIC32 but since I am very new to STM32 and its HAL I would appreciate any help. Thank you in advance
by the way, how to mark Code?
