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ThinkPad Keyboard Switcher

They can share a ThinkPad USB Keyboard with a track pointer to three PCs.

Chart

graph TD
    h[ThinkPad Keyboard: USB device] -->|USB| g[CH554T: USB host/SPI master]
    g -->|SPI| d[CH554E #0: USB device/SPI slave]
    g -->|SPI| e[CH554E #1: USB device/SPI slave]
    g -->|SPI| f[CH554E #2: USB device/SPI slave]
    d -->|USB| a[PC #0: USB host]
    e -->|USB| b[PC #1: USB host]
    f -->|USB| c[PC #2: USB host]
Loading

Build

git submodule init ch554_sdc
git submodule update ch554_sdc

cd device  
make

cd ../host  
make

Pin Assign

3X CH554E (behaves for a USB device of a PC)

pin # name function
1 P1.4/SCS SPI Slave Chip Selector
2 P1.5/MOSI SPI MOSI
3 P1.6/MISO SPI MISO
4 P1.7/SCK SPI Serial Clock
5 RST Hardware reset
6 P3.6/UDP USB Data (+)
7 P3.7/UDM USB Data (-)
8 GND
9 VCC(5V)
10 V33

1X CH554T(behaves for a USB host of a keyboard)

pin # name function
1 P3.2/INT0 ACT0 (if PC #0 connected)
2 P1.4/TIN2 CE0 (SPI Slave Chip Selector for PC #0)
3 P1.5/MOSI SPI MOSI
4 P1.6/MISO SPI MISO
5 P1.7/SCK SPI Serial Clock
6 RST Hardware Reset
7 P1.0/TIN0 LED0 (indicator of PC #0)
8 P1.1/TIN1 LED1 (indicator of PC #1)
9 P3.1/TXD CE1 (SPI Slave Chip Selector for PC #1)
10 P3.0/RXD ACT1 (if PC #1 connected)
11 P3.3/INT1 LED2 (indicator of PC #2)
12 P3.4/T0 CE2 (SPI Slave Chip Selector for PC #2)
13 P3.5/T1 ACT2 (if PC #2 connected)
14 P3.6/UDP USB Data (+)
15 P3.7/UDM USB Data (-)
16 P1.3/TXD_ TX (UART TX for debug)
17 P1.2/RXD_ SW (button)
18 GND
19 VCC
20 V33

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