Support "file-less" configuration #151

soburi · 2026-02-01T14:26:20Z

This PR introduce new configuration system without variants/[board].overlay.

Boards that has arduino like connector mostly has define arduino-header.
We can use this information to configure automatically for each boards.
We can support all zephyr supported that has arduino-header.
That means, we make it works for more 200 boards, including Nucleo series.

However, only Blinky works out of the box, and ADC and PWM channels are required.
These should be made into snippets in the future.

Copilot

Pull request overview

This PR introduces a "file-less" configuration system that automatically configures boards using Arduino-compatible header definitions from the device tree, eliminating the need for board-specific overlay files. The system detects supported connector types (arduino_header, arduino_mkr_header, etc.) and automatically maps GPIO pins, enabling support for 200+ Zephyr-supported boards including the Nucleo series.

Changes:

Added automatic board detection using device tree connector labels (arduino_header, pico_header, etc.)
Introduced GPIO port/pin abstraction layer with constexpr helper functions for compile-time pin mapping
Modified tone/noTone implementation to support dynamic timer allocation by tracking pin assignments
Updated PWM and ADC pin mappings to support both legacy and new connector-based configurations

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 21 comments.

File	Description
cores/arduino/Arduino.h	Adds macro definitions for automatic connector detection (ZARD_CONNECTOR, ZARD_ADC_CONNECTOR, ZARD_PWM_CONNECTOR) and updates digital/analog pin enums to support both legacy and connector-based configurations
cores/arduino/zephyrCommon.cpp	Implements GPIO abstraction layer with constexpr functions for pin mapping, updates all GPIO operations to use new abstraction, and modifies tone/noTone for improved timer management

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cores/arduino/zephyrCommon.cpp

cores/arduino/Arduino.h

cores/arduino/zephyrCommon.cpp

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

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samples/tone_doremi/src/app.cpp

cores/arduino/zephyrCommon.cpp

cores/arduino/Arduino.h

cores/arduino/zephyrCommon.cpp

DhruvaG2000 · 2026-02-09T12:42:05Z

This PR looks quite interesting, will be on my next list of things to review!

DhruvaG2000 · 2026-02-10T06:40:23Z

variants/arduino_uno_r4_r7fa4m1ab3cfm/variant.h

+ * Copyright (c) 2026 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */


If we can get #161 merged before this, then this will no longer be needed.

A new configuration method has been adopted, allowing support to be added with less configuration than before. Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

In preparation for improvements to allow the use of GPIOs without device tree definitions, the interface will be changed to specify port and pin instead of `gpio_dt_spec`. Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

If digital-gpio-pins is not defined, the pin configuration will be generated using the connector definition. This allows ArduinoCore-Zephyr to be used on boards that have arduino-header defined, without requiring specific configuration in ArduinoCore-Zephyr. Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Copilot

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

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Copilot · 2026-02-11T04:46:47Z

cores/arduino/zephyrCommon.cpp

+		    ())
+
+const struct adc_dt_spec arduino_adc[] = {
+#if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), adc_pin_gpios)


arduino_adc is enabled by checking adc_pin_gpios, but the array itself is generated from /zephyr,user/io-channels. This will fail to compile when adc-pin-gpios exists without io-channels, and it also prevents using io-channels unless adc-pin-gpios is present. Guard the array generation based on io_channels (provisioning) and keep association (adc_pin_gpios / connector map) independent.

Suggested change

#if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), adc_pin_gpios)

#if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), io_channels)

Copilot · 2026-02-11T04:46:47Z

cores/arduino/zephyrCommon.cpp

+  pcb = find_gpio_port_callback(port);
  __ASSERT(pcb != nullptr, "gpio_port_callback not found");

-  pcb->pins |= BIT(arduino_pins[pinNumber].pin);
+  pcb->pins |= BIT(local_gpio_pin(pinNumber));
  setInterruptHandler(pinNumber, callback);


attachInterrupt() can end up with port == nullptr from local_gpio_port(pinNumber) (invalid/unmapped global pin). In that case pcb will be nullptr and the __ASSERT(pcb != nullptr, ...) hard-fails; additionally BIT(local_gpio_pin(pinNumber)) is unsafe if the pin is invalid/out of range. Add an early return when port == nullptr (and validate the computed local pin before using it).

Copilot · 2026-02-11T04:46:47Z

cores/arduino/Arduino.h

+#if DT_NODE_EXISTS(DT_NODELABEL(arduino_header))
+#define ZARD_CONNECTOR arduino_header
+
+#define ZARD_ARDUINO_HEADER_R3_DIGITAL_MAP_0 D16
+#define ZARD_ARDUINO_HEADER_R3_DIGITAL_MAP_1 D17


The connector fallback uses ZARD_CONNECTOR_PIN_NAME() which expands to ZARD_<COMPAT>_DIGITAL_MAP_<n> macros. Only the arduino_header compatible has these _DIGITAL_MAP_ macros defined here; if a board uses arduino_mkr_header / arduino_nano_header / pico_header / boosterpack_header without /zephyr,user/digital-pin-gpios, this will expand to undefined tokens and fail to compile. Either restrict the auto-connector path to compatibles you fully map, or add the missing mapping macros for those connector compatibles.

Copilot · 2026-02-11T04:46:48Z

cores/arduino/Arduino.h

+#define ZARD_GET_NGPIOS(i, ...) DT_PROP(GET_ARG_N(UTIL_INC(i), __VA_ARGS__), ngpios)
+#define ZARD_SUM_NGPIOS(...)                                                                       \
+	LISTIFY(NUM_VA_ARGS(__VA_ARGS__), ZARD_GET_NGPIOS, (+), __VA_ARGS__)
+
+#define ZARD_GLOBAL_GPIO_OFFSET_(ph)                                                               \


ZARD_GET_NGPIOS uses DT_PROP(..., ngpios) but the runtime global-pin mapping in zephyrCommon.cpp uses DT_PROP_OR(..., ngpios, 0). To keep the compile-time pin constants consistent with runtime behavior (and avoid a hard build failure if any GPIO controller node lacks ngpios), consider switching this to DT_PROP_OR(..., ngpios, 0) as well.

soburi force-pushed the configure_by_connector_def branch from 30e80c9 to 2157ae2 Compare February 1, 2026 15:38

soburi changed the title ~~Configure by connector def~~ Support **file-less** configuration Feb 1, 2026

soburi changed the title ~~Support **file-less** configuration~~ Support "file-less" configuration Feb 1, 2026

soburi force-pushed the configure_by_connector_def branch 2 times, most recently from d14bab2 to 769f878 Compare February 5, 2026 15:17

soburi marked this pull request as ready for review February 5, 2026 15:17

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soburi marked this pull request as draft February 5, 2026 15:17

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soburi force-pushed the configure_by_connector_def branch from 165377e to aa5f7a5 Compare February 5, 2026 15:33

soburi requested a review from Copilot February 5, 2026 15:36

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soburi force-pushed the configure_by_connector_def branch 3 times, most recently from 9d23221 to 293076c Compare February 9, 2026 10:57

soburi force-pushed the configure_by_connector_def branch from 293076c to 7e1fd4c Compare February 9, 2026 14:23

DhruvaG2000 reviewed Feb 10, 2026

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soburi force-pushed the configure_by_connector_def branch 5 times, most recently from d652dbd to 2444ff6 Compare February 10, 2026 22:51

variant: Adds support for Arduino Uno R4.

5e6f4f5

A new configuration method has been adopted, allowing support to be added with less configuration than before. Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

soburi force-pushed the configure_by_connector_def branch 2 times, most recently from b3744ae to 0dbaf95 Compare February 10, 2026 23:54

soburi added 2 commits February 11, 2026 03:43

soburi force-pushed the configure_by_connector_def branch from dd32c52 to dc41a17 Compare February 11, 2026 03:46

soburi requested a review from Copilot February 11, 2026 04:41

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tokitah added 6 commits February 11, 2026 16:37

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	#if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), adc_pin_gpios)
	#if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), io_channels)

Support "file-less" configuration #151

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Support "file-less" configuration #151

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DhruvaG2000 commented Feb 9, 2026

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soburi commented Feb 1, 2026 •

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