On 2019-11-20 05:23, Yuri wrote:
I have a USB Hantek PC-oscilloscope.
Several seconds after the PulseView program begins to upload firmware
into it, the device disconnects:
ugen8.5: <vendor 0x04b4 product 0x6022> at usbus8
ugen8.5: <vendor 0x04b4 product 0x6022> at usbus8 (disconnected)
usbd_setup_device_desc: getting device descriptor at addr 5 failed,
USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 5 failed,
USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 5 failed,
USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 5 failed,
USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 5 failed,
USB_ERR_TIMEOUT
ugen8.5: <Unknown > at usbus8 (disconnected)
I don't believe that the device is broken, it is brand new.
Why would the device access, no mater what it is, cause the timeout and
disconnect?
Hi,
Some devices need to re-enumerate themself after the firmware is
uploaded. Maybe that process fails.
What is your USB host controller?
Did you try connecting through an external USB HUB.
Does the firmware uploader try to reset the USB device?
--HPS
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