qmk-firmware/keyboards/xd84/dev.md
zvecr 9a64c6b82e [Keyboard] XD84 fixes for caps lock led, backlight and firmware size (#5178)
* Enable backlight

* Enable Link Time Optimization

* Enable caps lock led
2019-02-18 16:48:52 -08:00

4.9 KiB

XD84

Development docs covering the following:

  • Kimera core
  • RGB
  • Backlight
  • Light Through Cat

Kimera core

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.