Date: Mon, 29 Nov 2021 18:46:31 +1030 From: Daniel O'Connor via hackers <hackers@freebsd.org> To: Daniel Braniss <danny@cs.huji.ac.il> Cc: freebsd- <hackers@freebsd.org> Subject: Re: usb serial - need quirk? Message-ID: <A30D3617-E061-4C05-9729-E5910AB7B6DE@dons.net.au> In-Reply-To: <B8593124-0D96-46A2-90E7-87B2F9CC6ADF@cs.huji.ac.il> References: <11EBCD70-3259-4E4D-8B9C-9F25364BC73C@cs.huji.ac.il> <20F9C20E-BB89-4FC1-A339-171447368AD2@dons.net.au> <D7FBBD72-5655-4F68-A539-7F2012A7D09A@cs.huji.ac.il> <A90E6140-3C80-4512-A337-C4827AEC8128@dons.net.au> <B8593124-0D96-46A2-90E7-87B2F9CC6ADF@cs.huji.ac.il>
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> On 29 Nov 2021, at 18:09, Daniel Braniss <danny@cs.huji.ac.il> wrote: > >> On 29 Nov 2021, at 09:24, Daniel O'Connor <darius@dons.net.au> wrote: >> >> I had a look at the ESP32-C3 datasheet and it *does* have a USB interface built in and it talks about a CDC-ACM virtual serial port which matches what you see. >> >> The only ACM quirk I can see is UQ_ASSUME_CM_OVER_DATA so you could try that I suppose.. > > >> (See the usb_quirk man page) >> > i’ll try this ASAP, thanks > > BTW, looking at the m5 stamp c3 diagram, I can’t see how the usb-typec is connected to the esp32c3 > from the esp32c3 docs, it’s gpio9 that needs to be grounded to flash, and I don’t see that happening when > using the onboard usb. > oh well, The schematic at https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/static/assets/img/product_pics/core/stamp_c3/stamp_c3_sch_01.webp it has a CH9102F and some googling suggests it presents as a CDC ACM device. It looks like it has RTS and DTR hooked up so they can reset and drive GPIO9 for programming. Unfortunately I can't see anything obvious about why it doesn't work :( -- Daniel O'Connor "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum
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