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Seebs 7fbe6c3594 improve ergodox ez performance 
With these changes, the ergodox ez goes from 315 scans per second
when no keys are pressed (~3.17ms/scan) to 447 (~2.24ms/scan).

The changes to the pin read are just condensing the logic, and
replacing a lot of conditional operations with a single bitwise
inversion.

The change to row scanning is more significant, and merits
explanation. In general, you can only scan one row of a keyboard
at a time, because if you scan two rows, you no longer know
which row is pulling a given column down. But in the Ergodox
design, this isn't the case; the left hand is controlled by an
I2C-based GPIO expander, and the columns and rows are *completely
separate* electrically from the columns and rows on the right-hand
side.

So simply reading rows in parallel offers two significant
improvements. One is that we no longer need the 30us delay after
each right-hand row, because we're spending more than 30us
communicating with the left hand over i2c. Another is that we're
no longer wastefully sending i2c messages to the left hand
to unselect rows when no rows had actually been selected in the
first place. These delays were, between them, coming out to
nearly 30% of the time spent in each scan.

Signed-off-by: seebs <seebs@seebs.net>
2017-11-26 02:07:06 -05:00
..
keymaps Update to drashna keymaps (#4) 2017-11-17 20:48:26 -05:00
util Creates a layouts/ folder for keymaps shared between keyboards (#1609) 2017-08-23 22:29:07 -04:00
190hotfix.sh Creates a layouts/ folder for keymaps shared between keyboards (#1609) 2017-08-23 22:29:07 -04:00
config.h improve ergodox ez performance 2017-11-26 02:07:06 -05:00
ergodox_ez.c fix typo 2017-11-26 02:07:06 -05:00
ergodox_ez.h add initial support for left leds on an ergodox ez 2017-10-27 13:24:30 -07:00
i2cmaster.h Creates a layouts/ folder for keymaps shared between keyboards (#1609) 2017-08-23 22:29:07 -04:00
matrix.c improve ergodox ez performance 2017-11-26 02:07:06 -05:00
readme.md Allow multiple process_record() calls per scan 2017-11-21 00:20:52 -05:00
rules.mk document how to define LEFT_LEDS and how that hack is done 2017-10-27 13:46:51 -07:00
twimaster.c Creates a layouts/ folder for keymaps shared between keyboards (#1609) 2017-08-23 22:29:07 -04:00

readme.md

ErgoDox EZ

The Ez uses the Teensy Loader.

Linux users need to modify udev rules as described on the Teensy Linux page. Some distributions provide a binary, maybe called teensy-loader-cli.

To flash the firmware:

  • Build the firmware with make keymapname, for example make default

  • This will result in a hex file called ergodox_ez_keymapname.hex, e.g. ergodox_ez_default.hex

  • Start the teensy loader.

  • Load the .hex file into it.

  • Press the Reset button by inserting a paperclip gently into the reset hole in the top right corder.

  • Click the button in the Teensy app to download the firmware.

To flash with ´teensy-loader-cli´:

  • Build the firmware with make keymapname, for example make default

  • Run ´<path/to/>teensy_loader_cli -mmcu=atmega32u4 -w ergodox_ez_.hex´

  • Press the Reset button by inserting a paperclip gently into the reset hole in the top right corder.

Settings

You may want to enable QMK_KEYS_PER_SCAN because the Ergodox has a relatively slow scan rate.