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XD84

Development docs covering the following:

Kimera core
RGB
Backlight
Light Through Cat

Kimera core

What little available info that was available for the qmk port

atmega32u4 16Mhz
- board seems to have a 6Mhz crystal
2x PCA9555 I2C IO expander

Links:

/*
Kimera_core_v1.0 Components

             U1 (atmega32u4)
           ,----------------.
      TX --| TX0(PD3)   RAW |--
      RX --| RX1(PD2)   GND |--
         --| GND      RESET |-- RST
         --| GND        VCC |--
     SDA --| 2(PD1) (PF4)A3 |--
     SCL --| 3(PD0) (PF5)A2 |--
   (INT) --| 4(PD4) (PF6)A1 |--
         --| 5(PC6) (PF7)A0 |--
         --| 6(PD7) (PB1)15 |-- SCK
    LED2 --| 7(PE6) (PB3)14 |-- MISO
    LED1 --| 8(PB4) (PB2)16 |-- MOSI
    LED3 --| 9(PB5) (PB6)10 |-- LED4
          `----------------'

         IC1 (PCA9555)                  IC2 (PCA9555)
         ,----------.                   ,----------.
   SDA --| SDA  P00 |-- P1        SDA --| SDA  P00 |-- P17
   SCL --| SCL  P01 |-- P2        SCL --| SCL  P01 |-- P18
   INT --| INT  P02 |-- P3        INT --| INT  P02 |-- P19
         |      P03 |-- P4              |      P03 |-- P20
   GND --| A0   P04 |-- P5        VCC --| A0   P04 |-- P21
   SJ1 --| A1   P05 |-- P6        SJ1 --| A1   P05 |-- P22
   SJ2 --| A2   P06 |-- P7        SJ2 --| A2   P06 |-- P23
         |      P07 |-- P8              |      P07 |-- P24
         |          |                   |          |
         |      P10 |-- P9              |      P10 |-- P25
         |      P11 |-- P10             |      P11 |-- P26
         |      P12 |-- P11             |      P12 |-- P27
         |      P13 |-- P12             |      P13 |-- P28
         |      P14 |-- P13             |      P14 |-- P29
         |      P15 |-- P14             |      P15 |-- P30
         |      P16 |-- P15             |      P16 |-- P31
         |      P17 |-- P16             |      P17 |-- P32
         `----------'                   `----------'
*/

Bootloader

Default bootloader is atmel-dfu. Reboot to bootloader via magnetic switch next to icsp header. Flash using regular dfu methods.

XD84 pin mappings

Taken from kimera-config.json

"row_mapping": [ 1, 2, 3, 4, 5, 6 ],
"col_mapping": [ 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 ],

RGB

PIN C7
Number of RGB LED 7

Backlight

PIN B6

Light Through Cat

TODO - PWM C6

Assumptions

Pin/Port mappings

All cols are on the same IC
All rows are on the same IC and port
Pins mapped sequentially
Each port only does row or column not a mixture of both
- No need to have complex port config

ROW index	Kimera Pin	PCA9555
0	1	IC1 Port 0 pin 0
1	2	IC1 Port 0 pin 1
2	3	IC1 Port 0 pin 2
3	4	IC1 Port 0 pin 3
4	5	IC1 Port 0 pin 4
5	6	IC1 Port 0 pin 5

Safe enough to assume row_index == pin

COL index	Kimera Pin	PCA9555
0	17	IC2 Port 0 pin 0
1	18	IC2 Port 0 pin 1
2	19	IC2 Port 0 pin 2
3	20	IC2 Port 0 pin 3
4	21	IC2 Port 0 pin 4
5	22	IC2 Port 0 pin 5
6	23	IC2 Port 0 pin 6
7	24	IC2 Port 0 pin 7
8	25	IC2 Port 1 pin 0
9	26	IC2 Port 1 pin 1
10	27	IC2 Port 1 pin 2
11	28	IC2 Port 1 pin 3
12	29	IC2 Port 1 pin 4
13	30	IC2 Port 1 pin 5
14	31	IC2 Port 1 pin 6

Safe enough to assume here col_index does not need to be converted to pin
Reading both ports one after the other gives us the same sequential behavior
- maps to the usual practice of reading matrix columns
- while this technically gives 16 column reads, the 16th column can never be set so is safely ignored

Notes

pca9555 datasheet

Other Kimera based boards with non sequential pin mappings, pins mapped across ICs, or mixed row/col configs will need more complicated pin -> i2c_addr,port,pin logic as well as rather more complex pin functions.

Return to stock firmware

Not tested but original firmware seems to be available in the kairyu/tkg-firmware repo.

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