BYK916 Pinout/Conventions/Findings

[swiftgeek]

Disclaimer

I do not have board with BYK916, but I still noticed some things, that would be good to follow/reference.
Some features/pins/polarity might be configurable in firmware.

I'm also prone to making loads of typos, so really please check with the board

Also this only covers BYK916-specific details, see #1 for general ones.

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BYK916 pinout (this refers mostly to BYKxxx firmware, and not actual MCU - which is reported to be SH68F90A):

BYK916 kicad symbol (incomplete)

Read SH68F90 CV2.0.pdf for actual MCU pins

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BYK916 charge features:
CH - connects to a charge controller, netname after a resistor CHARGE.
USB-CH - simply detects voltage being applied to USB connector

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BYK916 connection to BT MCU - Beken BK3632

• CSNA / CLKA / MOSIA / MISOA - SPI/JTAG interface for BK3632, could be used for ICP/ISP of flash in BK3632.
  • Likely relevant repository for SPI flashing protocol, elektroda thread
• P42A (BK3632 GPIO P11) - Unknown, function implemented in BK3632 firmware
• MOTA (BK3632 GPIO P31) - Unknown, function implemented in BK3632 firmware

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BYK916 RGB LED driving pins

• Driving pins are most likely called DR(0..5)_(R/G/B)
• V(R/B/G)(0..5) is the net powering led (so after transistors - usually S8050)
• Pin mapping to SH68F90:

Row0:
Red: VR0 -> P4_1
Green: VG0 -> P6_0
Blue: VB0 -> P4_0
Row1:
Red: VR1 -> P0_4
Green: VG1 -> P6_1
Blue: VB1 -> P0_3
Row2:
Red: VR2 -> P6_7
Green: VG2 -> P6_2
Blue: VB2 -> P6_6
Row3:
Red: VR3 -> P0_2
Green: VG3 -> P6_3
Blue: VB3 -> P5_7
Row4:
Red: VR4 -> P4_5
Green: VG4 -> P6_4
Blue: VB4 -> P4_6
Row5:
Red: VR5 -> P4_3
Green: VG5 -> P6_5
Blue: VB5 -> P4_4

[r3d5ky]

Hi, some times ago I also tried to find info about BYK916, and eventually found some chinese repos on github, which looks like a complete projects for keyboard based on SH68F90 with tri-mode wireless (I think with BK3632), and mouse with SH68F91. Unfortunately, I can't find these repos anymore, maybe they are already deleted, but I found copies of them in my file stash, maybe it will be interesting to you or help in RE-ing :)
K916 998版NEW 三模 B10.00.zip
BY9132_3325_FYI.zip

[swiftgeek]

Was trying to not mention them, since license for sinowealth provided parts is dubious and findings/conventions are mirrored in their docs anyway (sadly spread out over many datasheets of different devices).
K916 998版NEW 三模 B10.00 and BY9132_3325_FYI