STM32F730R8T6 for USB FS connection ,getting device descriptor failed error and Unknown device detected error . Can anybody help me, what going wrong in my USB configuration. Thanks in advance

[NChow]

LL driver parameters settings as follows.,

 hpcd.Instance = USB_OTG_FS;

 hpcd.Init.dev_endpoints = 4; //11

 hpcd.Init.use_dedicated_ep1 = 0;

 hpcd.Init.ep0_mps = 0x40;

 hpcd.Init.dma_enable = 0;

 hpcd.Init.low_power_enable = 1;

 hpcd.Init.phy_itface = PCD_PHY_EMBEDDED;

 hpcd.Init.Sof_enable = 0;

 hpcd.Init.speed = PCD_SPEED_FULL;

 hpcd.Init.vbus_sensing_enable = 1;

 hpcd.Init.lpm_enable = 0;