[patch #10150] Add support for Teensy bootloader

[Marius Greuel]

URL:
  <https://savannah.nongnu.org/patch/?10150>

                 Summary: Add support for Teensy bootloader
                 Project: AVR Downloader/UploaDEr
            Submitted by: mariusgreuel
            Submitted on: Sun 28 Nov 2021 10:17:31 PM UTC
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

This patch adds support for the Teensy HalfKay bootloader:
https://www.pjrc.com/teensy/halfkay_protocol.html

This programmer supports the AVR devices only:
- Teensy 1.0 (AT90USB162)
- Teensy 2.0 (ATmega32U4)
- Teensy++ 1.0 (AT90USB646)
- Teensy++ 2.0 (AT90USB1286)

Typically command-line usage is
avrdude -c teensy -p m32u4 -x wait -V -F -U flash:w:main.hex:i

The -V switch is required because the bootloader does not support reading.

Also, on my Linux box, libhidapi does not return the proper HID usage page,
which is used by the bootloader to identify devices. When a HID usage of zero
is reported, the programmer defaults to a zero signature, which then requires
the -F switch. Not sure whether there is a Linux libhidapi implementation that
actually works. Windows works correctly.

Note that the udev rules need to be changed, too:

# Teensy Bootloader
SUBSYSTEM=="usb", ATTR{idVendor}=="16c0", ATTR{idProduct}=="0478",
TAG+="uaccess"

Let me know what you think.



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File Attachments:


-------------------------------------------------------
Date: Sun 28 Nov 2021 10:17:31 PM UTC  Name: avrdude-teensy-v1.patch  Size:
24KiB   By: mariusgreuel

<http://savannah.nongnu.org/patch/download.php?file_id=52373>

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