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keyboard_interface_fix #2

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sirlilpanda merged 13 commits from keyboard_interface_fix into main 2026-02-19 00:48:15 -08:00
Conversation 3 Commits 13 Files Changed 3 +17909 -1814
sirlilpanda commented 2026-01-22 17:35:22 -08:00
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Added buffered interface for the keyboard as well as display and peripherals.

Keyboard interface is defined within the keyboard kicad project, it has:

left side controller interrupt
right side controller interrupt
scl
sda
led_din
Controller reset
This interface should not only allow for the different keyboard configurations to be used but also split keyboard to be used as well

3 more interfaces were also added the display interface, a buffer uart line; and 2 i2c peripheral lines using a different bus from the keyboard to prevent peripherals from key logging.

Added buffered interface for the keyboard as well as display and peripherals. Keyboard interface is defined within the keyboard kicad project, it has: left side controller interrupt right side controller interrupt scl sda led_din Controller reset This interface should not only allow for the different keyboard configurations to be used but also split keyboard to be used as well 3 more interfaces were also added the display interface, a buffer uart line; and 2 i2c peripheral lines using a different bus from the keyboard to prevent peripherals from key logging.
sirlilpanda self-assigned this 2026-01-22 17:35:22 -08:00
sirlilpanda added 11 commits 2026-01-22 17:35:22 -08:00
addded pefault pin configuration and connect mcu to keyboard interface a67083e82e
connect MCU to keyboard interface 262a80f285
added buffers for keyboard, peripherals and display interfaces 6dc5400d7b
forgot to connect enable label d158fddf4c
added another bus buffer for the perphieral interface 8e0c65e06e 
so it can either be on the left or right hand side of the keyboard
merged perpherial and display interfaces in to 1 uart bus 2f45d73360
keyboard and power perfs are now on the same i2c bus with the perfs being on another 8415c5d871
merged i2c for keyboard and power perfs 0243b330dc
added display enable 179cd7651d
interface is now wired up to the micro 29513d59fe
keyboard interface now has display interface with uart and perphieral interface with i2c in a multimaster config e42b38e44f
sirlilpanda requested review from jordan 2026-01-22 17:35:23 -08:00
jordan commented 2026-02-07 18:08:56 -08:00
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Visually quite messy, seems electrically fine. A few questions:

  1. Why is KEYBOARD_PWR made a separate net when it is used interchangeably with the +5V net? Should it be fused before the connector?
  2. Why doesn't every buffer chip have pull up enable jumpers? Are they necessary at all, could resistors just be de-soldered?
  3. Are separate pull downs necessary on the PERIPHERAL_EN line?
Visually quite messy, seems electrically fine. A few questions: 1. Why is `KEYBOARD_PWR` made a separate net when it is used interchangeably with the +5V net? Should it be fused before the connector? 2. Why doesn't every buffer chip have pull up enable jumpers? Are they necessary at all, could resistors just be de-soldered? 3. Are separate pull downs necessary on the `PERIPHERAL_EN` line?
sirlilpanda commented 2026-02-08 13:35:12 -08:00
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KEYBOARD_PWR is mainly there to show where the decoupling capacitors should be near too and yes it is just interchangeable with the 5v rail.

multiple pull downs are there because i copied and pasted however they shouldnt effect the performance of the device, but ill remove the duplicates and add them to the MCU page instead.

ditto to the second one

`KEYBOARD_PWR` is mainly there to show where the decoupling capacitors should be near too and yes it is just interchangeable with the 5v rail. multiple pull **downs** are there because i copied and pasted however they shouldnt effect the performance of the device, but ill remove the duplicates and add them to the MCU page instead. ditto to the second one
sirlilpanda added 2 commits 2026-02-08 13:41:21 -08:00
moved pull downs from keyboard interface to here to avoid duplacates 2269c4def1
moved pull downs to MCU sheet 45772a7dec
jordan commented 2026-02-19 00:35:43 -08:00
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Approved

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👍 1 🎉 1
sirlilpanda merged commit d3dec943a0 into main 2026-02-19 00:48:15 -08:00
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Reference: sirlilpanda/the-shrimpt-keyboard#2
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