Seeeduino XIAO

Overview

This is a set of Bridle’s extension to the original Zephyr upstream board Seeeduino XIAO with some adaptions and improvement on Kconfig and Devicetree level.

List of extensions

Kconfig

deactivate self powered USB explicitly and set the maximum of electrical current consumption to 500㎃:

Seeeduino XIAO

Kconfig.defconfig

config USB_SELF_POWERED
	default n
	depends on USB_DEVICE_STACK && BOARD_SEEEDUINO_XIAO

config USB_MAX_POWER
	default 250 if BOARD_SEEEDUINO_XIAO	# 500mA
	depends on USB_DEVICE_STACK && BOARD_SEEEDUINO_XIAO

change log level and startup delay only in case of use the native USB device port atmel,sam0-usb with CDC-ACM UART zephyr,cdc-acm-uart as Zephyr console:

Seeeduino XIAO

Kconfig.defconfig

# Workaround for not being able to have commas in macro arguments
DT_CHOSEN_Z_CONSOLE := zephyr,console
DT_COMPAT_Z_CDC_ACM_UART := zephyr,cdc-acm-uart
DT_COMPAT_ATMEL_USB := atmel,sam0-usb

# Macros to shorten Kconfig expressions
DT_CHOSEN_CONSOLE_NODE := $(dt_chosen_path,$(DT_CHOSEN_Z_CONSOLE))
DT_CHOSEN_CONSOLE_PARENT := $(dt_node_parent,$(DT_CHOSEN_CONSOLE_NODE))

if BOARD_SEEEDUINO_XIAO && \
	$(dt_chosen_enabled,$(DT_CHOSEN_Z_CONSOLE)) && \
	$(dt_compat_on_bus,$(DT_COMPAT_Z_CDC_ACM_UART),usb) && \
	$(dt_node_has_compat,$(DT_CHOSEN_CONSOLE_PARENT),$(DT_COMPAT_ATMEL_USB))

# Logger cannot use itself to log
choice USB_CDC_ACM_LOG_LEVEL_CHOICE
	default USB_CDC_ACM_LOG_LEVEL_OFF
	depends on LOG
endchoice

# Set USB log level to error only
choice USB_DEVICE_LOG_LEVEL_CHOICE
	default USB_DEVICE_LOG_LEVEL_ERR
	depends on LOG
endchoice

# Wait 4000ms at startup for logging
config LOG_PROCESS_THREAD_STARTUP_DELAY_MS
	default 4000
	depends on LOG

# Wait 4000ms at startup for USB enumeration on host side
config BOOT_DELAY
	default 4000

endif # zephyr,cdc-acm-uart

Devicetree

set default entries for model and compatible of the boards:

Seeeduino XIAO

seeeduino_xiao.overlay

/ {
	model = "Seeeduino XIAO @ UART Concole";
	compatible = "seeed,seeeduino-xiao-uartcons",
		     "seeed,seeeduino-xiao",
		     "atmel,samd21g18a",
		     "atmel,samd21";
};