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[Docs] Update ISP Guide (#9748) 

* [Doc] Update ISP Guide

Correct the fuses for Caterina, and make the `:production` command more obvious.

* fix casing before fauxpark catches it
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Drashna Jaelre 2020-07-18 13:24:23 -07:00 committed by GitHub
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docs/isp_flashing_guide.md
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@ -141,7 +141,9 @@ To do this manually:
?> It's possible to use other bootloaders here in the same way, but __you need a bootloader__, otherwise you'll have to use ISP again to write new firmware to your keyboard.
To do this the easy way, you can flash the board using the `:production` target when compiling. This compiles the firmware, then compiles the QMK DFU bootloader, and then creates a combined image. Once this is done, you'll see three files:
#### Create QMK DFU Bootloader and Production images
You can create the firmware, the QMK DFU Bootloader and the production firmware images for the board using the `:production` target when compiling. Once this is done, you'll see three files:
* `<keyboard>_<keymap>.hex`
* `<keyboard>_<keymap>_bootloader.hex`
* `<keyboard>_<keymap>_production.hex`
@ -236,12 +238,12 @@ For Caterina on the `atmega32u4`, these are the fuse settings that you want:
| Fuse | Setting|
|----------|--------|
| Low | `0xFF` |
| High | `0xD9` |
| Extended | `0xC3` |
| High | `0xD8` |
| Extended | `0xCB` |
To set this add `-U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xC3:m` to your command. So the final command should look something like:
To set this add `-U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xCB:m` to your command. So the final command should look something like:
avrdude -c avrisp -P COM3 -p atmega32u4 -U flash:w:main.hex:i -U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xC3:m
avrdude -c avrisp -P COM3 -p atmega32u4 -U flash:w:main.hex:i -U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xCB:m
If you are using a different controller or want different configuration, you can use [this AVR Fuse Calculator](http://www.engbedded.com/fusecalc/) to find a better value for you.