Attiny85: increase delay #983

umbynos · 2022-05-31T14:30:43Z

More details at https://forum.arduino.cc/t/usbtinyisp-from-ide/263885

Related conversation with @MCUdude umbynos@7c18d4b#commitcomment-73300758

Co-authored-by: Martino Facchin m.facchin@arduino.cc

More details at https://forum.arduino.cc/t/usbtinyisp-from-ide/263885 Co-authored-by: Martino Facchin <m.facchin@arduino.cc>

dl8dtl · 2022-06-15T20:00:37Z

Well, all these proposed values look pretty arbitrary to me.

The values that are currently in avrdude.conf reflect the numbers from the datasheet (or .atdf file), and they are pretty much the same (4 ms / 4.5 ms) for almost all newer AVRs. The chiperasetime value is documented to only affect HVSP programming, which is completely irrelevant to the USBtinyISP device. (In fact, it's always 0 for all entries anyway, and stk500v2.c is the only consumer of that value.)
The EEPROM "delay" value (6 in the original, 12 in the patch, 5 in the current .atdf file) is again only used in the stk500v2.c parameter block, not affecting USBtinyISP in any way.

Finally, the patch only affects the ATtiny85, but what about its smaller siblings (ATtiny45, ATtiny25)?

While I have no doubt that these changes might have cured the symptoms of the person once submitting them, I think the actual issue must be somewhere else.

MCUdude · 2022-06-20T10:46:35Z

For reference, delays similar to this PR are already present in the current avrdude.conf file.

Here's a few:
ATmega324P
ATmega644
ATmega1284
ATmega64RFR2
ATmega128RFA1

mcuee · 2022-06-20T10:54:31Z

Maybe we can ask the users whether they also encounter issues with similar chips like ATtiny45 and ATtiny25, Probably they will have the same issue and it is just because ATtiny85 is much more popular than the other two.

umbynos · 2022-06-20T13:21:29Z

Maybe we can ask the users

@mcuee
Where should this action take place? If you mean here, that post is from 2014.

BTW here's another report https://learn.adafruit.com/introducing-trinket/programming-with-avrdude

mcuee · 2022-06-20T13:28:46Z

@mcuee Where should this action take place? If you mean here, that post is from 2014.

I mean in the general Arduino forum -- probably a new post to ask about ATtiny45 and ATtiny25 to see if they have the same problem like the ATtiny85 or not.

per1234 · 2022-06-21T02:19:35Z

Can anyone here even reproduce the problem with the ATtiny85?

I can't, even using the same version of AVRDUDE and avrdude.conf bundled with the Arduino IDE 1.0.5-r2 installation, on Windows 7, using the drivers provided by Adafruit in that Trinket tutorial. I don't have a Trinket so I'm using a USBtinyISP connected to an ATtiny85 running on the 8 MHz internal oscillator (the clock configuration of the Trinket), as was done by the user at https://forum.arduino.cc/t/usbtinyisp-from-ide/263885.

dl8dtl · 2022-06-21T06:30:45Z

For reference, delays similar to this PR are already present in the current avrdude.conf file.

These are different families, which have indeed different delays described in their datasheet.

As argued above, the delays in this proposal look completely arbitrary, and most of them don't even affect the programming tool used. That's why I question the complete proposal, unless someone can describe a scenario how to reproduce a problem with the ATtinyX5. Personally, I have been using these ATtinys quite a bit in the past, and never encountered problems with them.

per1234 · 2022-06-21T07:00:41Z

@ladyada would you or someone else from Adafruit mind checking whether this patch is still needed with the latest AVRDUDE from this repository to reliably upload to the Trinket and Gemma?

This patch originated from Adafruit: arduino/toolchain-avr#21

MCUdude · 2022-06-21T07:11:58Z

Can anyone here even reproduce the problem with the ATtiny85?

I haven't used the ATtiny85 that much, but I've used the USBtinyISP programmer a lot with the ATtiny13, which was reported to have similar issues. I've never had any issues with the USBtinyISP when using the ATtiny13, and that's with "sensible" delay values.

It may be that @ladyada knows why the original ATtiny85-based Adafruit Trinket needs such large delays, and if this somehow has later been fixed. BTW does anyone know where I can find the source code for the Trinket bootloader?

per1234 · 2022-06-21T07:22:01Z

does anyone know where I can find the source code for the Trinket bootloader?

Here it is:
https://github.com/adafruit/Adafruit-Trinket-Gemma-Bootloader

ladyada · 2022-06-28T22:45:44Z

our notes say

Because the USB bootloader is a little different than an off-the-shelf programmer, we have to update the configuration file to have a longer erase delay. This does not affect programming bare Attiny85 chips, so you can use this configuration file with Trinkets or raw chips without any problems.

probably this is due to USB transmission delays, we had timeout errors otherwise

dl8dtl · 2022-06-29T20:46:48Z

But see my analysis above:

#983 (comment)

umbynos · 2022-07-13T15:39:31Z

Hi @dl8dtl,
sorry for the delay, finally I had some time to carry on some tests.

I tried uploading to an Arduino Gemma with our patched version of the avrdude.conf (which includes the patch we are trying to upstream with this PR). This is the result:

"/home/umberto/.arduino15/packages/arduino/tools/avrdude/7.0-arduino.3/bin/avrdude" "-C/home/umberto/.arduino15/packages/arduino/hardware/avr/1.8.99/bootloaders/gemma/avrdude.conf" -v -V -pattiny85 -carduinogemma  "-Uflash:w:/tmp/arduino-sketch-61D4583461DF5011988F3D93F494BD0B/Blink.ino.hex:i"

avrdude: Version 7.0-arduino.3
         Copyright (c) Brian Dean, http://www.bdmicro.com/
         Copyright (c) Joerg Wunsch

         System wide configuration file is "/home/umberto/.arduino15/packages/arduino/hardware/avr/1.8.99/bootloaders/gemma/avrdude.conf"
         User configuration file is "/home/umberto/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : usb
         Using Programmer              : arduinogemma
avrdude: usbdev_open(): Found USBtinyISP, bus:device: 001:019
         AVR Part                      : ATtiny85
         Chip Erase delay              : 400000 us
         RESET disposition             : possible i/o
         RETRY pulse                   : SCK
         Serial program mode           : yes
         Parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                           Block Poll               Page                       Polled
           Memory Type Alias    Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- -------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom                 65    12     4    0 no        512    4      0  4000  4500 0xff 0xff
           flash                  65     6    32    0 yes      8192   64    128 30000 30000 0xff 0xff
           signature               0     0     0    0 no          3    0      0     0     0 0x00 0x00
           lock                    0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           lfuse                   0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           hfuse                   0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           efuse                   0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           calibration             0     0     0    0 no          2    0      0     0     0 0x00 0x00

         Programmer Type : USBtiny
         Description     : Arduino Gemma. Based on USBtiny
avrdude: programmer operation not supported

avrdude: Using SCK period of 10 usec
avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e930b (probably t85)
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: 7 retries during SPI command
avrdude: Using SCK period of 10 usec
avrdude: reading input file "/tmp/arduino-sketch-61D4583461DF5011988F3D93F494BD0B/Blink.ino.hex"
avrdude: writing flash (682 bytes):

Writing | #####                                              | 9% 0.03savrdude: 8 retries during SPI command
Writing | #########                                          | 18% 0.07savrdude: 7 retries during SPI command
Writing | ##############                                     | 27% 0.11savrdude: 8 retries during SPI command
Writing | ##################                                 | 36% 0.14savrdude: 8 retries during SPI command
Writing | #######################                            | 45% 0.18savrdude: 8 retries during SPI command
Writing | ################################                   | 63% 0.25savrdude: 8 retries during SPI command
Writing | ####################################               | 72% 0.29savrdude: 8 retries during SPI command
Writing | #########################################          | 81% 0.33savrdude: 8 retries during SPI command
Writing | #############################################      | 90% 0.36savrdude: 8 retries during SPI command
Writing | ################################################## | 100% 0.40s

avrdude: 682 bytes of flash written

avrdude done.  Thank you.

And the uploaded code seems to work just fine on the board.

By only setting chip_erase_delay back to 4500, just like in the avrdude.conf file in this repo, I get this:

"/home/umberto/.arduino15/packages/arduino/tools/avrdude/7.0-arduino.3/bin/avrdude" "-C/home/umberto/.arduino15/packages/arduino/hardware/avr/1.8.99/bootloaders/gemma/avrdude.conf" -v -V -pattiny85 -carduinogemma  "-Uflash:w:/tmp/arduino-sketch-61D4583461DF5011988F3D93F494BD0B/Blink.ino.hex:i"

avrdude: Version 7.0-arduino.3
         Copyright (c) Brian Dean, http://www.bdmicro.com/
         Copyright (c) Joerg Wunsch

         System wide configuration file is "/home/umberto/.arduino15/packages/arduino/hardware/avr/1.8.99/bootloaders/gemma/avrdude.conf"
         User configuration file is "/home/umberto/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : usb
         Using Programmer              : arduinogemma
avrdude: usbdev_open(): Found USBtinyISP, bus:device: 001:017
         AVR Part                      : ATtiny85
         Chip Erase delay              : 4500 us
         RESET disposition             : possible i/o
         RETRY pulse                   : SCK
         Serial program mode           : yes
         Parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                           Block Poll               Page                       Polled
           Memory Type Alias    Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- -------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom                 65    12     4    0 no        512    4      0  4000  4500 0xff 0xff
           flash                  65     6    32    0 yes      8192   64    128 30000 30000 0xff 0xff
           signature               0     0     0    0 no          3    0      0     0     0 0x00 0x00
           lock                    0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           lfuse                   0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           hfuse                   0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           efuse                   0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           calibration             0     0     0    0 no          2    0      0     0     0 0x00 0x00

         Programmer Type : USBtiny
         Description     : Arduino Gemma. Based on USBtiny
avrdude: programmer operation not supported

avrdude: Using SCK period of 10 usec
avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e930b (probably t85)
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: Using SCK period of 10 usec

avrdude: error: usbtiny_transmit: Broken pipe
avrdude: reading input file "/tmp/arduino-sketch-61D4583461DF5011988F3D93F494BD0B/Blink.ino.hex"
avrdude: writing flash (682 bytes):

Writing |                                                    | 0% 0.00s
avrdude: error: usbtiny_send: Broken pipe (expected 64, got -32)
Writing | #####                                              | 9% 0.00s
avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 11 retries during SPI command
avrdude: 8 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 34 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 26 retries during SPI command
avrdude: 8 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 16 retries during SPI command
avrdude: 9 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 9 retries during SPI command
avrdude: 8 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 34 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 27 retries during SPI command
avrdude: 9 retries during SPI command
avrdude: 8 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 17 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 9 retries during SPI command
avrdude: 8 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 27 retries during SPI command
avrdude: 8 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 17 retries during SPI command
avrdude: 8 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 17 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 16 retries during SPI command
avrdude: 8 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 25 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 14 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 16 retries during SPI command
Writing | #####                                              | 10% 0.33savrdude: 8 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
avrdude: 17 retries during SPI command
avrdude: 9 retries during SPI command

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)

avrdude: error: usbtiny_receive: Broken pipe (expected 4, got -32)
Writing | ######                                             | 11% 0.36savrdude: 35 retries during SPI command
avrdude: 8 retries during SPI command
avrdude: 9 retries during SPI command
Writing | ################################################## | 100% 1.04s

avrdude: 682 bytes of flash written

avrdude done.  Thank you.

and the board does not seems to work.

The interesting part is this one:
If I try to use the default avrdude.conf present on this repo, with only this small addition:

programmer
  id    = "arduinogemma";
  desc  = "Arduino Gemma. Based on USBtiny";
  type  = "usbtiny";
  connection_type = usb;
  usbvid     = 0x2341;
  usbpid     = 0x0c9f;
;

I get the exact same error.

This experiment led me to think that indeed we need that delay.

As @ladyada explained this is because that board do not use a programmer but instead when the mcu is powered on acts as a programmer itself for a few seconds using bit banging, after that runs the user program.
Infact the avrdude: 8 retries during SPI command could be caused by this. I'm not knowledged enough about this topic. But at this point I think that that delay is required for that board to work properly.

Well, all these proposed values look pretty arbitrary to me.

Probably you are right about this, and I don't know all the back-story since I was not part of Arduino at that point.

Finally, the patch only affects the ATtiny85, but what about its smaller siblings (ATtiny45, ATtiny25)?

Probably yes, if they use the same kind of bootloader.
Unfortunately I do not have these MCU to test things out.

Maybe a viable solution would be to add another entry in the avrdude.conf to cover this use-case? Just like the guys from adafruit suggests: https://github.com/adafruit/Adafruit-Trinket-Gemma-Bootloader/blob/master/avrdude.conf.addition.txt
Of course I don't know if such thing would be accepted.

dl8dtl · 2022-07-13T20:45:49Z

Thanks for the feedback, it's welcome.

My problem with changing any of that: these parameters are obtained from the Atmel definitions, and they are meant to apply to certain (Atmel-origin) programmers.

If any particular implementation cloning that protocol needs more time, in my opinion, it's the responsibility of that implementation to adapt the timing accordingly. So if a bootloader needs 200 ms instead of the 4.5 ms defined by the datasheet, they are free to simply implement a longer timeout (and/or completely ignoring the incoming parameter). If you attach it to an Atmel/Microchip Studio, and declare it being an STK500, they are passing the exact same values down *) as AVRDUDE does.

*) If not, it's indeed a bug in AVRDUDE. They are supposed to be the same.

mcuee · 2022-07-14T03:56:07Z

It seems to me the right solution is to create a new programmer type called arduino-gemma or (adafruti-gemma) and then deal with it in usbtiny code as usbtiny is the parent. Hopefully it is possible to differentiate usbtiny with the gemma bootloader.

Ref: https://github.com/adafruit/Adafruit-Trinket-Gemma-Bootloader/blob/master/avrdude.conf.addition.txt

dl8dtl · 2022-07-14T05:19:59Z

Or just have the USBtiny code not use STK500 values at all, instead use fixed values inside.
It seems the critical value is the chip erase delay here.

mcuee · 2022-07-14T05:23:18Z

Or just have the USBtiny code not use STK500 values at all, instead use fixed values inside. It seems the critical value is the chip erase delay here.

Good idea.

dl8dtl · 2022-07-14T05:35:58Z

usbtiny_chip_erase() has:

usleep( p->chip_erase_delay );

Just use any larger value there. @umbynos can you give it a try whether 100000 (µs) is already sufficient, or does it really have to wait for 400 ms?

umbynos · 2022-07-14T16:43:33Z

Nope, with hip_erase_delay = 100000; won't work, it seems to be the same error as with the default unpatched avrdude config:
out.txt

dl8dtl · 2022-07-14T18:04:55Z

OK, then I suggest we simply change the wait time in the USBtiny implementation to 400 ms.
There's no point for it to reuse the STK500 value if it just doesn't work for some implementations.

dl8dtl · 2022-07-14T18:05:30Z

@umbynos Do you want to change your PR that way, or do you want me to suggest a new one instead?

dl8dtl · 2022-07-14T20:38:58Z

@ladyada Is there any way to tell this bootloader apart from a real USBtiny programmer?

If so, the extension of the wait time could be made dependant on that.

umbynos · 2022-07-18T13:14:22Z

@umbynos Do you want to change your PR that way, or do you want me to suggest a new one instead?

Since I don't know the codebase that well, maybe it would be better if you could suggest a new one instead.

stefanrueger · 2022-07-18T14:28:26Z

So, the affected boards' bootloaders latch on to the -c usbtiny protocol, which I believe has no handshake. For this to work, AVRDUDE would need to wait for the requests to have been processed on the board. A reasonable estimate for the time that a bootloader needs to emulate chip erase will probably be flash->num_pages * part->chip_erase_delay. This assumes that an SPM page erase does not take longer than an SPI programming chip erase. BTW (as a side note) I wonder why the -c usbtiny programmer gets initialised after the chip erase. Is that really necessary?

avrdude/src/usbtiny.c

Lines 636 to 639 in a5552f6

    
           usleep( p->chip_erase_delay ); 
        
           // prepare for further instruction 
        
           pgm->initialize(pgm, p);

Going down the route of a computed chip erase time penalises large parts, eg, ATmega2560, when programmed with a proper usbtiny physical programmer, as the chip erase time would then be 10 s rather than the necessary 10 ms (or so). Maybe best to estimate needed delays with the target parts/boards, try them out and then use one fixed value that suits all target boards.

stefanrueger · 2022-07-18T14:38:58Z

And also, have a look at the proposed urprotocol #940 (comment), which is meant to help establish exactly what the bootloader is capable of. This should, if/once implemented into future AVRDUDE releases, enable boards like trinket to carry out happy bootloading with small resources (the corresponding prototype ATmega85 bootloader is 256 bytes albeit without EEPROM support).

dl8dtl · 2022-07-19T21:33:38Z

flash->num_pages * part->chip_erase_delay

We now know that the ATtiny85 works with 400 ms delay, while it fails with 100 ms. Does that somewhat fit into this formula?

stefanrueger · 2022-07-20T00:12:42Z

flash->num_pages * part->chip_erase_delay

We now know that the ATtiny85 works with 400 ms delay, while it fails with 100 ms. Does that somewhat fit into this formula?

128*4500 µs, so 576 ms. Considering it's an upper estimate and that the subsequent pgm->initialize(pgm, p) will burn through one or more(?) 50 ms periods, the 400 ms look like it fits with the formula.

Future release fun: expr $(avrdude -p ATtiny85/st | grep num_pages | cut -f5 ) \* $(avrdude -p ATtiny85/st | grep chip_erase_delay | cut -f4 ) (this is how I actually found out)

stefanrueger · 2022-07-20T00:19:29Z

But I wouldn't just use the formula. I would cap it somehow. For an ATmega2560 this results in a 9.2 s pause that is hard to explain to users that use an actual (physical) programmer that can do the job in that many ms.

dl8dtl · 2022-07-20T06:22:16Z

I wish there were a method to tell a real USBtinyISP apart from a bootloader.

I suggest a solution that uses extended arguments (-x) for larger delays than 400 ms, so any user who does use such a bootloader on a large device has a way to override it appropriately.

mcuee · 2022-08-01T11:49:00Z

I wish there were a method to tell a real USBtinyISP apart from a bootloader.

@dl8dtl and @umbynos

If we just need to differentiate USBtinyISP and the Arduino Gemma bootloader, then there is a simple way -- to use different USB VID/PID.

USBtinyISP:
https://github.com/avrdudes/avrdude/blob/main/src/usbdevs.h#L51-L55

// these are specifically assigned to USBtiny,
// if you need your own VID and PIDs you can get them for cheap from
// www.mecanique.co.uk so please don't reuse these. Thanks!
#define USBTINY_VENDOR_DEFAULT  0x1781
#define USBTINY_PRODUCT_DEFAULT 0x0C9F

Arduino Gemma Bootloader

programmer
  id    = "arduinogemma";
  desc  = "Arduino Gemma. Based on USBtiny";
  type  = "usbtiny";
  connection_type = usb;
  usbvid     = 0x2341;
  usbpid     = 0x0c9f;
;

dl8dtl · 2022-08-01T11:51:54Z

Good idea.
Maybe we should opt for a (generic) is_bootloader flag in the conf file then? @stefanrueger What do you think?

mcuee · 2022-08-01T11:54:44Z

is_bootloader flag is a good idea and it was mentioned by @stefanrueger before.

BTW, if we also want to further differentiate the original Adafruit Trinket bootloader vs the USBTinyISP programmer, we can still use the USB Vendor Name and USB Device Name String. But I think this is not necessary if we use the is_bootloader flag in the conf file.

Ref: https://github.com/adafruit/Adafruit-Trinket-Gemma-Bootloader/blob/master/usbconfig.h

#define USB_CFG_VENDOR_NAME 'A','d','a','f','r','u','i','t'
#define USB_CFG_VENDOR_NAME_LEN 8
#define USB_CFG_DEVICE_NAME 'T','r','i','n','k','e','t'
#define USB_CFG_DEVICE_NAME_LEN 7

USBtinyISP (it seems to me the compatible programmers all follow the USBtiny Device Name.

// The following optional macros may be used as an identification of
// your device. Undefine them when you run out of flash space.
//#define	USBTINY_VENDOR_NAME		"Dick Streefland"
#define	USBTINY_DEVICE_NAME		"USBtiny"
#undef	USBTINY_SERIAL

dl8dtl · 2022-08-01T13:03:33Z

I don't think it's necessary to differentiate various bootloaders.
The issue is, a bootloader cannot perform a straight chip erase, so it needs to erase page by page, which takes some time. The larger the flash is, the longer. As Stefan pointed out above, for large MCUs, that's going to be quite a bit already – and way too much to let all the users of a standalone USBtinyISP wait that long (because that one can issue a chip erase).

So, if is_bootloader is true, we can use Stefan's formula, otherwise we can just use the / a standard waiting time.

mcuee · 2022-08-01T13:28:48Z

I don't think it's necessary to differentiate various bootloaders. The issue is, a bootloader cannot perform a straight chip erase, so it needs to erase page by page, which takes some time. The larger the flash is, the longer. As Stefan pointed out above, for large MCUs, that's going to be quite a bit already – and way too much to let all the users of a standalone USBtinyISP wait that long (because that one can issue a chip erase).

Thanks. I agree with this.

So, if is_bootloader is true, we can use Stefan's formula, otherwise we can just use the standard waiting time.

Yes. That is a good approach.

umbynos · 2022-08-01T14:49:36Z

If we just need to differentiate USBtinyISP and the Arduino Gemma bootloader, then there is a simple way -- to use different USB VID/PID.

This seems like an excellent idea

stefanrueger · 2022-08-01T15:57:13Z

We have a few good solutions here that each are better than increasing the part chip delay (which is for a different purpose)

Programmer-specific -x delay for chip erase
Create a programmer variant that sets is_bootloader and estimate wait for chip erase algorithmically (here 576 ms)
Use 400 ms chip erase delay in the usbtiny programmer

Each method has advantages and disadvantages. The most general and most robust for me is 2. Implementation is not too hard and (I predict) will find good use otherwise. The slight disadvantage is a proliferation of the programmers, but not a high price to pay for a generic, clean and robust solution.

@umbynos Would 2 be a suitable solution?

I don't know what is involved in using different VID/PID but suspect this involves a new programmer entry in avrdude.conf with a new name. What should that name be? Does the bootloader for Trinket and Gemma have a name?

mcuee · 2022-08-02T05:14:41Z

I don't know what is involved in using different VID/PID but suspect this involves a new programmer entry in avrdude.conf with a new name. What should that name be? Does the bootloader for Trinket and Gemma have a name?

@stefanrueger
I believe that is the case. You can refer to the following pull request from @MCUdude.

Add PicKit4 and SNAP programmers #791

As for the name, we can use something like Adafruit_Trinket_Gemma and Arduino_Gemma.

umbynos · 2022-08-02T09:43:04Z

@umbynos Would 2 be a suitable solution?

Definitely should solve the problem

Does the bootloader for Trinket and Gemma have a name?

I think it should be "gemmaBoot": defined here.
But Adafruit_Trinket_Gemma and Arduino_Gemma are even better.

I don't know if VID and PID are needed but they are defined here.
VID -> USB_CFG_VENDOR_ID
PID -> USB_CFG_DEVICE_ID
The added one are the one for the Arduino Gemma. The removed ones are for the Adafruit Trinket

mcuee · 2022-08-04T06:39:35Z

I have changed the label to enhancement -- to cater for the bootloader. And looks like Option 2 is the preferred way to go. So when @stefanrueger creates the new pull request, we can close this one.

mcuee · 2022-08-08T15:17:38Z

Just got one Tiny85 board to work with the Arduino_Gemma bootloader and I can reproduce the issue and I can confirm that 400ms delay works fine (Option 3). On the other hand, I understand that Option 2 is a better option.

dl8dtl · 2022-08-08T20:51:52Z

and I can confirm that 400ms delay works fine (Option 3)

The problem with option 2 is that it would only be sufficient for a small device. As soon as someone has the idea to use that bootloader on a larger device, it will fail again.

stefanrueger · 2022-08-09T08:51:55Z

Just to confirm that I am queuing up work for a generic bootloader solution for all parts, large and small, in the coming weeks.

mcuee · 2022-08-12T12:27:08Z

BTW, today I got the chance to test usbasploader (based on USBAP) and it seems to work on the USBAP clones (ATmega8A version) well enough. Looks like it does not have the issues of the usbtiny based bootloader mentioned in this issue.
Ref: https://jethomson.wordpress.com/2011/08/18/project-ouroboros-reflashing-a-betemcu-usbasp-programmer/

mcuee · 2022-08-15T07:12:46Z

Using the usbasploader bootloader to load the usbasp application:

C:\work\avr\avrdude_test\avrdude_bin> .\avrdude -c usbasp -p m8a -U .\hex\usbasp_m8a_16Jul2022.hex

avrdude.exe: warning: cannot set sck period. please check for usbasp firmware update.
avrdude.exe: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude.exe: Device signature = 0x1e9307 (probably m8a)
avrdude.exe: NOTE: "flash" memory has been specified, an erase cycle will be performed
             To disable this feature, specify the -D option.
avrdude.exe: erasing chip
avrdude.exe: warning: cannot set sck period. please check for usbasp firmware update.
avrdude.exe: reading input file .\hex\usbasp_m8a_16Jul2022.hex for flash
avrdude.exe: writing 5670 bytes flash ...

Writing | ################################################## | 100% 1.43s

avrdude.exe: 5670 bytes of flash written
avrdude.exe: verifying flash memory against .\hex\usbasp_m8a_16Jul2022.hex

Reading | ################################################## | 100% 0.66s

avrdude.exe: 5670 bytes of flash verified

avrdude.exe done.  Thank you.

Verified with another usbasp:

C:\work\avr\avrdude_test\avrdude_bin> .\avrdude -c usbasp -p m8a -U flash:v:.\hex\usbasp_m8a_16Jul2022.hex:i

avrdude.exe: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude.exe: Device signature = 0x1e9307 (probably m8a)
avrdude.exe: verifying flash memory against .\hex\usbasp_m8a_16Jul2022.hex

Reading | ################################################## | 100% 1.32s

avrdude.exe: 5670 bytes of flash verified

avrdude.exe done.  Thank you.

stefanrueger · 2022-08-31T17:26:31Z

@umbynos Please head over to PR #1093 and try it out. If that works, pls close this PR

umbynos · 2022-09-06T13:29:38Z

Closing because superseded by #1093. For further details, #1093 (comment)

Attiny85: increase delay

0c41e21

More details at https://forum.arduino.cc/t/usbtinyisp-from-ide/263885 Co-authored-by: Martino Facchin <m.facchin@arduino.cc>

mcuee added the question Further information is requested label Jun 20, 2022

dl8dtl added the unconfirmed Maybe a bug, needs to be reproduced by someone else label Jun 21, 2022

Propagate arduino/avrdude-packing#8

66492cf

This was referenced Jul 30, 2022

Linux and macOS releases are missing -- static linking version preferred (Low Priority) #987

Closed

Fuses sometimes fail to write #1049

Closed

mcuee added enhancement New feature or request and removed question Further information is requested unconfirmed Maybe a bug, needs to be reproduced by someone else labels Aug 4, 2022

mcuee mentioned this pull request Aug 30, 2022

Add new components in avrdude.conf.in #1091

Merged

stefanrueger mentioned this pull request Aug 31, 2022

Create two bootloader programmers for gemmaBoot boards #1093

Merged

umbynos closed this Sep 6, 2022

umbynos deleted the attiny85_delay branch September 6, 2022 13:29

umbynos mentioned this pull request Sep 6, 2022

remove patch 0003 arduino/avrdude-packing#20

Merged

Attiny85: increase delay #983

Attiny85: increase delay #983

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