Re: usb CH9102 serial chip

From: Daniel Braniss <danny_at_cs.huji.ac.il>
Date: Thu, 17 Feb 2022 09:20:34 UTC 

> On 17 Feb 2022, at 11:09, Daniel O'Connor <darius@dons.net.au> wrote:
> 
> 
> 
>> On 17 Feb 2022, at 17:47, Daniel Braniss <danny@cs.huji.ac.il> wrote:
>> is there some quirk to enable this chip?
>> it’s an new riskv esp32 board but I can only use the usb to download software, no console output from it.
> 

> Are you saying that you can flash the board with it?
> 
> If that is the case then the chip/driver are working fine since that requires bidirectional communication etc..
> 

but that works only if I power up the board while pressing a button, then it also appears as /dev/ttyU0, and
so then I can flash, after reset, the device is gone and there are errors ( BTW, the flashed image workes):

Feb 17 09:46:59 pampero kernel: usbd_setup_device_desc: getting device descriptor at addr 4 failed, USB_ERR_IOERROR
Feb 17 09:47:00 pampero kernel: usbd_req_re_enumerate: addr=4, set address failed! (USB_ERR_IOERROR, ignored)
Feb 17 09:47:01 pampero kernel: usbd_setup_device_desc: getting device descriptor at addr 4 failed, USB_ERR_IOERROR
Feb 17 09:47:01 pampero kernel: usbd_req_re_enumerate: addr=4, set address failed! (USB_ERR_IOERROR, ignored)
Feb 17 09:47:03 pampero kernel: usbd_setup_device_desc: getting device descriptor at addr 4 failed, USB_ERR_IOERROR
Feb 17 09:47:03 pampero kernel: usbd_req_re_enumerate: addr=4, set address failed! (USB_ERR_IOERROR, ignored)
Feb 17 09:47:05 pampero kernel: usbd_setup_device_desc: getting device descriptor at addr 4 failed, USB_ERR_IOERROR
Feb 17 09:47:06 pampero kernel: usbd_req_re_enumerate: addr=4, set address failed! (USB_ERR_IOERROR, ignored)
Feb 17 09:47:08 pampero kernel: usbd_setup_device_desc: getting device descriptor at addr 4 failed, USB_ERR_IOERROR
Feb 17 09:47:08 pampero kernel: ugen0.4: <Unknown > at usbus0 (disconnected)
Feb 17 09:47:08 pampero kernel: uhub_reattach_port: could not allocate new device


> --
> Daniel O'Connor
> "The nice thing about standards is that there
> are so many of them to choose from."
> -- Andrew Tanenbaum
> 

cheers,
	danny