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Update the i2c interface spec

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This commit is contained in:
Ondrej Jirman 2021-06-20 01:48:34 +02:00
parent f0b5f8cb68
commit 2a2ce1429c
1 changed files with 23 additions and 3 deletions
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26
README.i2c-intf
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@ -23,7 +23,12 @@ Registers
0x00: Device ID1 (0x4b)
0x01: Device ID2 (0x42)
0x02: Firmware revision
0x03: System configuration
0x03: Firmware features
bit 0: USB debugger
bit 1: Flashing mode
bit 2: Self-test features
0x04: System configuration
bit 0: disable KB scanning (1: scanning disabled, 0: scanning enabled)
bit 1: poll mode
1: don't rely on row change detection, poll the matrix periodically
@ -34,14 +39,29 @@ Registers
1: enabled
0: disabled
0x06: System command
Writing values into this register causes the firmware to perform
certain one-shot actions:
0x52 ('R') - reset the MCU
0x63 ('c') - run a column self-test
0x72 ('r') - run a row self-test
(results for both tests will be stored in test-result
registers)
0x10: Keyboard data for column 1
...
0x0b: Keyboard data for column 12
0x0c: CRC8 of keyboard data from 0x10-0x0b
0x1b: Keyboard data for column 12
0x1c: CRC8 of keyboard data from 0x10-0x0b
0x20: Writing value 0x53 ('S') to this register stops the main app from
jumping to the user app.
0x50: Self-test results (32 bytes)
...
0x6f:
0x70: Flashing mode unlock key
(writing 0x46 to this register unlocks the flashing mode.)