[bug #49881] programmer is out of sync on Raspberry Pi 3

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[bug #49881] programmer is out of sync on Raspberry Pi 3

Matthijs Kooijman-2
URL:
  <http://savannah.nongnu.org/bugs/?49881>

                 Summary: programmer is out of sync on Raspberry Pi 3
                 Project: AVR Downloader/UploaDEr
            Submitted by: None
            Submitted on: Sun 18 Dec 2016 10:39:06 PM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: LeBomb
        Originator Email: [hidden email]
             Open/Closed: Open
                 Release: 6.3
         Discussion Lock: Any
     Programmer hardware: Stk500/arduino
             Device type: atmega328

    _______________________________________________________

Details:

Hello,
I installed arduino 1.6.13 (which embed avrdude 6.3) on a Raspberry Pi 3
(2016-11-25-raspbian-jessie).
I correctly program my arduino Nano when I connect the Nano on a USB port of
the RPI3.
But, if i connect the RPI3 on a USB Hub which is connected to the RPI3, the
upload fails:

avrdude: AVR device initialized and ready to accept instructions
avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: stk500_cmd(): programmer is out of sync


I tried many scenario to understand the problem:
- I installed the same configuration on a RPI1 and on a RPI2, everything works
correctly on both.

- I set the speed of my RPI3 to 500Mhz and everything works correcly !

It seems that this bug is linked to latency/timing problems

Regards,
LB




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