Samuel Holland
bd69a00f7a
common: Improve crc8 generation
...
Start with 0xff instead of 0x00, so the CRC will be nonzero (and length
dependent) for data that is all zeroes.
Remove unnecessary masking, since `crc` is already an 8-bit integer.
2021-08-02 10:13:06 +02:00
Ondrej Jirman
3b723583e7
firmware: Make interrupt signal shorter (10us)
...
This is long enough, comparable to 100kHz I2C speeds.
2021-08-02 10:12:48 +02:00
Ondrej Jirman
2fbc2e057e
firmware: Implement scanning block
...
This allows to disable the keyboard. The firmware will never scan
for keys pressed in this mode, and it will powerdown the MCU most of the
time.
2021-08-02 10:12:48 +02:00
Ondrej Jirman
41418cdc14
firmware: Jump to stock firmware sooner after powerup
...
Signed-off-by: Ondrej Jirman <megous@megous.com>
2021-08-02 10:12:48 +02:00
Ondrej Jirman
176a2da7e2
firmware: Implement USB enabled/disable control via I2C
2021-08-02 10:05:43 +02:00
Ondrej Jirman
134b4b6a8b
firmware: Move more of the USB shutdown control to usb_enable/usb_disable
...
- make sure USB resources are re-enabled before jumping to bootloader
- make sure all USB resources are disabled prior to jumping to user fw
2021-08-02 10:03:48 +02:00
Ondrej Jirman
6a5fe581b9
Implement flashing over I2C and user/stock firmware support
...
I2C register layout changed a bit to make various operations easier
to implement in FW and for the user.
Flashing/debugging tools now share more code. Firmware is now more
configurable (it's now possible to compile-out various features).
Self-testing for column-shorts is implemented.
Firmware is optimized for low power consumption.
2021-06-28 15:09:47 +02:00
Ondrej Jirman
04ca071b09
Fixup/document I2C
2021-06-19 02:51:23 +02:00
Ondrej Jirman
fbfa245ad4
Allow to use debug printing from interrupt handlers
2021-06-19 02:50:34 +02:00
Ondrej Jirman
2725248532
Add USB stack for easier printf() based debugging of the firmware
2021-06-18 19:43:11 +02:00
Ondrej Jirman
c8d8eef090
Fix key release change detection in polling mode
2021-06-18 18:28:56 +02:00
Ondrej Jirman
b9b02a5e73
Update some comments
2021-06-16 14:44:18 +02:00
Ondrej Jirman
bca8c47f46
Implement polled mode and key bitmap change signalling via external interrupt
...
- this firmware consumes about 4-5 mA (can be probably made lower)
2021-06-16 14:09:25 +02:00
Ondrej Jirman
e59f647d83
Allow to switch to bootloader mode via FN+PINE+F
2021-06-15 09:21:31 +02:00
Ondrej Jirman
d3c45f58a4
Initial commit
2021-06-14 00:10:49 +02:00
