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Add a warning about USBtinyISP limitations to the ISP flashing guide (#15898)

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Sergey Vlasov 2022-01-30 22:06:19 +03:00 committed by GitHub
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docs/isp_flashing_guide.md
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@ -57,13 +57,33 @@ To use a Teensy 2.0 as an ISP flashing tool, you will first need to load a [spec
!> Note that the `B0` pin on the Teensy should be wired to the `RESET` pin on the keyboard's controller. ***DO NOT*** connect the `RESET` pin on the Teensy to the `RESET` on the keyboard.
### SparkFun PocketAVR / USBtinyISP / USBasp
### SparkFun PocketAVR / USBtinyISP
[SparkFun PocketAVR](https://www.sparkfun.com/products/9825)
[Adafruit USBtinyISP](https://www.adafruit.com/product/46)
!> SparkFun PocketAVR and USBtinyISP **DO NOT support** AVR chips with more than 64 KiB of flash (e.g., the AT90USB128 series). This limitation is mentioned on the [shop page for SparkFun PocketAVR](https://www.sparkfun.com/products/9825) and in the [FAQ for USBtinyISP](https://learn.adafruit.com/usbtinyisp/f-a-q#faq-2270879). If you try to use one of these programmers with AT90USB128 chips, you will get verification errors from `avrdude`, and the bootloader won't be flashed properly (e.g., see the [issue #3286](https://github.com/qmk/qmk_firmware/issues/3286)).
**AVRDUDE Programmer**: `usbtiny`
**AVRDUDE Port**: `usb`
#### Wiring
|ISP |Keyboard|
|---------|--------|
|`VCC` |`VCC` |
|`GND` |`GND` |
|`RST` |`RESET` |
|`SCLK` |`SCLK` |
|`MOSI` |`MOSI` |
|`MISO` |`MISO` |
### USBasp
[Thomas Fischl's USBasp](https://www.fischl.de/usbasp/)
**AVRDUDE Programmer**: `usbtiny` / `usbasp`
**AVRDUDE Programmer**: `usbasp`
**AVRDUDE Port**: `usb`
#### Wiring