Re: usb serial - need quirk?
- Reply: Daniel Braniss : "Re: usb serial - need quirk?"
- In reply to: Daniel Braniss : "Re: usb serial - need quirk?"
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Date: Mon, 29 Nov 2021 07:24:20 UTC
> On 29 Nov 2021, at 17:35, Daniel Braniss <firstname.lastname@example.org> wrote: >>> it’s the last line that I think is causing failure to flash the device (probably needs the break to set the speed?) >> >> Why would it need break to set the speed? > don’t know, but I’ve seen in the past serial stuff that needed the break to synchronize. >> >>> any ways, is there some fix for this? >> >> You didn't actually post the problem you are having so it's impossible to say :) >> I assume esptool fails but it would be helpful if you posted the output. > the flashing keeps failing with: > Chip is ESP32-C3 (revision 3) > Features: Wi-Fi > Crystal is 40MHz > MAC: 7c:df:a1:a3:61:74 > Uploading stub... > > A fatal error occurred: Failed to write to target RAM (result was 01070000) >> >> I haven't used an ESP32-C3 but all of the other ESP's don't have USB built in so it depends what USB UART you have on your board - any idea which one it it? > all the other esp32 I have work fine, it’s this esp32c3 that fails. > anyways, i got hold of a ttl to usb from m5stack, and after some fiddling got it to flash! > this chip is CP2104, > so the problem seems to be in the driver for the unknown chip on this esp32c3 - no > indication in the diagrams, nor can I read the micro words on the chip :-( 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) -- Daniel O'Connor "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum