Re: usb serial - need quirk?
- Reply: Daniel O'Connor via hackers : "Re: usb serial - need quirk?"
- In reply to: Daniel O'Connor via hackers : "Re: usb serial - need quirk?"
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Date: Mon, 29 Nov 2021 07:39:52 UTC
> On 29 Nov 2021, at 09:24, Daniel O'Connor <email@example.com> wrote: > > > >> 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) > 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, thanks again, danny > -- > Daniel O'Connor > "The nice thing about standards is that there > are so many of them to choose from." > -- Andrew Tanenbaum >