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diff --git a/docs/faq_debug.md b/docs/faq_debug.md index 9e76ac409..3f7cfe747 100644 --- a/docs/faq_debug.md +++ b/docs/faq_debug.md @@ -48,6 +48,45 @@ SUBSYSTEMS=="usb", ATTRS{idVendor}=="feed", MODE:="0666" *** # Miscellaneous +## Safety Considerations + +You probably don't want to "brick" your keyboard, making it impossible +to rewrite firmware onto it. Here are some of the parameters to show +what things are (and likely aren't) too risky. + +- If your keyboard map does not include RESET, then, to get into DFU + mode, you will need to press the reset button on the PCB, which + requires unscrewing the bottom. +- Messing with tmk_core / common files might make the keyboard + inoperable +- Too large a .hex file is trouble; `make dfu` will erase the block, + test the size (oops, wrong order!), which errors out, failing to + flash the keyboard, leaving it in DFU mode. + - To this end, note that the maximum .hex file size on Planck is + 7000h (28672 decimal) + +``` +Linking: .build/planck_rev4_cbbrowne.elf [OK] +Creating load file for Flash: .build/planck_rev4_cbbrowne.hex [OK] + +Size after: + text data bss dec hex filename + 0 22396 0 22396 577c planck_rev4_cbbrowne.hex +``` + + - The above file is of size 22396/577ch, which is less than + 28672/7000h + - As long as you have a suitable alternative .hex file around, you + can retry, loading that one + - Some of the options you might specify in your keyboard's Makefile + consume extra memory; watch out for BOOTMAGIC_ENABLE, + MOUSEKEY_ENABLE, EXTRAKEY_ENABLE, CONSOLE_ENABLE, API_SYSEX_ENABLE +- DFU tools do /not/ allow you to write into the bootloader (unless + you throw in extra fruitsalad of options), so there is little risk + there. +- EEPROM has around a 100000 write cycle. You shouldn't rewrite the + firmware repeatedly and continually; that'll burn the EEPROM + eventually. ## NKRO Doesn't work First you have to compile frimware with this build option `NKRO_ENABLE` in **Makefile**. |