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Diffstat (limited to 'docs/faq_debug.md')
| -rw-r--r-- | docs/faq_debug.md | 20 |
1 files changed, 7 insertions, 13 deletions
diff --git a/docs/faq_debug.md b/docs/faq_debug.md index 7c1690d13f..1e0cdc82bf 100644 --- a/docs/faq_debug.md +++ b/docs/faq_debug.md @@ -27,7 +27,7 @@ You may need privilege to access the device on OS like Linux. Check: - *hid_listen* finds your device. See above. - Enable debug with pressing **Magic**+d. See [Magic Commands](https://github.com/tmk/tmk_keyboard#magic-commands). -- set `debug_enable=true` usually in `matrix_init()` in **matrix.c**. +- set `debug_enable=true`. See [Testing and Debugging](newbs_testing_debugging.md#debugging) - try using 'print' function instead of debug print. See **common/print.h**. - disconnect other devices with console function. See [Issue #97](https://github.com/tmk/tmk_keyboard/issues/97). @@ -87,6 +87,7 @@ Size after: - 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 firmware with this build option `NKRO_ENABLE` in **Makefile**. @@ -183,22 +184,15 @@ Pressing any key during sleep should wake host. Arduino Leonardo and micro have **ATMega32U4** and can be used for TMK, though Arduino bootloader may be a problem. +## Enabling JTAG -## Using PF4-7 Pins of USB AVR? -You need to set JTD bit of MCUCR yourself to use PF4-7 as GPIO. Those pins are configured to serve JTAG function by default. MCUs like ATMega*U* or AT90USB* are affected with this. +By default, the JTAG debugging interface is disabled as soon as the keyboard starts up. JTAG-capable MCUs come from the factory with the `JTAGEN` fuse set, and it takes over certain pins of the MCU that the board may be using for the switch matrix, LEDs, etc. -If you are using Teensy this isn't needed. Teensy is shipped with JTAGEN fuse bit unprogrammed to disable the function. +If you would like to keep JTAG enabled, just add the following to your `config.h`: -See this code. -``` - // JTAG disable for PORT F. write JTD bit twice within four cycles. - MCUCR |= (1<<JTD); - MCUCR |= (1<<JTD); +```c +#define NO_JTAG_DISABLE ``` -https://github.com/tmk/tmk_keyboard/blob/master/keyboard/hbkb/matrix.c#L67 - -And read **26.5.1 MCU Control Register – MCUCR** of ATMega32U4 datasheet. - ## Adding LED Indicators of Lock Keys You need your own LED indicators for CapsLock, ScrollLock and NumLock? See this post. |