This zephyr example is for MCP3204(12bits 4ch-ADC).

For zmk firmware, I'd like to check this example on zephyr 3.5 beforehand.

wiring

setup

cd /PATH/TO/zmk/zephyr/samples/            # for zmk
cp -r ~/Downloads/zephyr-sample-mcp3204 ./mcp3204

build

cd /PATH/TO/zmk/zephyr/samples/mcp3204     # for zmk
west build -p always -b seeeduino_xiao_ble -- -DDTC_OVERLAY_FILE=foo.overlay

flash

Double click the reset button on XIAO-BLE to put it into the boot-mode. and then:

west flash

check output

Using tio as below:

CH0: 2144  // X value
CH1: 3792  // Y value
CH2: 4094  // Edge (+)
CH3: 0     // Edge (-) 
CH0: 2144
 :

links

• Zephyr Official Document/MCP3204
• Device Driver:
  • zephyr/drivers/adc/adc_mcp320x.c
  • zephyr/drivers/adc/Kconfig.mcp320x