USB HOST IN FIRMWARE set for HS 480 MbS mode?

[GW8RDI]

I was looking through the USB host code to see if I could connect a keyboard, and the initialisation routine sets the USB for HS, high speed, 480 Mb/s, which I believe requires a PHY chip to work. Is there such a chip on the board?

Here is the code:-

`/**

• @brief USBH_LL_Init

•     Initialize the Low Level portion of the Host driver.
  

• @param phost: Host handle
• @RetVal USBH Status
  */
  USBH_StatusTypeDef USBH_LL_Init (USBH_HandleTypeDef phost)
  {
  / Init USB_IP /
  if (phost->id == HOST_HS) { /// CAN UHSDR BE HS 480 MbS CAPABLE!?!?
  / Link The driver to the stack */
  hhcd_USB_OTG_HS.pData = phost;
  phost->pData = &hhcd_USB_OTG_HS;

hhcd_USB_OTG_HS.Instance = USB_OTG_HS;
hhcd_USB_OTG_HS.Init.Host_channels = 12;
hhcd_USB_OTG_HS.Init.speed = HCD_SPEED_FULL;
hhcd_USB_OTG_HS.Init.dma_enable = DISABLE;
hhcd_USB_OTG_HS.Init.phy_itface = USB_OTG_EMBEDDED_PHY;
hhcd_USB_OTG_HS.Init.Sof_enable = DISABLE;
hhcd_USB_OTG_HS.Init.low_power_enable = DISABLE;
hhcd_USB_OTG_HS.Init.vbus_sensing_enable = DISABLE;
hhcd_USB_OTG_HS.Init.use_external_vbus = DISABLE;
if (HAL_HCD_Init(&hhcd_USB_OTG_HS) != HAL_OK)
{
Error_Handler();
}

USBH_LL_SetTimer (phost, HAL_HCD_GetCurrentFrame(&hhcd_USB_OTG_HS));
}
return USBH_OK;
}`

[db4ple]

This code works. It makes use of the embedded PHY of the MCU in full speed mode.

73, DB4PLE

[GW8RDI]

Thanks, but I'm confused that the UHSDR code sets High Speed mode:-
hhcd_USB_OTG_HS.Instance = USB_OTG_HS;

The terminology is confusing, "full-speed" is "full" to 12 Mb/s, and "High speed" is up to 480 Mb/s and requires an external dedicated chip. It's interesting that ST support have told me that for the H743 it needs the external device, or perhaps it's recommended. I've been having some trouble getting clarity out of ST, they have confirmed that there USB drivers haven't been updated since 2015, so no support still for higher streaming rates like UAC 2.0.