samples: Added attach_interrupt sample

Add a sample to demonstrate how to use attachInterrupt

Signed-off-by: TOKITA Hiroshi <[email protected]>

Author: soburi

samples/attach_interrupt/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+
+set(DTC_OVERLAY_FILE $ENV{ZEPHYR_BASE}/../modules/lib/Arduino-Zephyr-API/variants/${BOARD}/${BOARD}.overlay)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(attach_interrupt)
+
+target_sources(app PRIVATE src/main.cpp)
+
+zephyr_compile_options(-Wno-unused-variable -Wno-comment)

samples/attach_interrupt/README.rst

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+.. _attach_interrupt-sample:
+
+AttachInterrupt
+######
+
+Overview
+********
+
+This sample demonstrates how to use attachInterrupt API.
+
+Building and Running
+********************
+
+Build and flash attachInterrupt sample as follows,
+
+```sh
+$> west build  -p -b arduino_nano_33_ble samples/basic/attach_interrupt/ -DZEPHYR_EXTRA_MODULES=/home/$USER/zephyrproject/modules/lib/Arduino-Core-Zephyr
+
+$> west flash --bossac=/home/$USER/.arduino15/packages/arduino/tools/bossac/1.9.1-arduino2/bossac
+```
+
+Turn on the LED by detecting interrupts. And Turn off the next interrupt.

samples/attach_interrupt/prj.conf

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+CONFIG_GPIO=y
+CONFIG_CPLUSPLUS=y
+CONFIG_ARDUINO_API=y
+CONFIG_GPIO_GET_CONFIG=y

samples/attach_interrupt/src/main.cpp

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+/*
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <Arduino.h>
+
+const byte ledPin = LED_BUILTIN;
+const byte interruptPin = 2;
+volatile PinStatus state = LOW;
+
+#ifndef digitalPinToInterrupt
+#define digitalPinToInterrupt(p) p
+#endif
+
+void blink() {
+  state = (PinStatus)!state;
+}
+
+void setup() {
+  pinMode(ledPin, OUTPUT);
+  pinMode(interruptPin, INPUT_PULLUP);
+  attachInterrupt(digitalPinToInterrupt(interruptPin), blink, CHANGE);
+}
+
+void loop() {
+  digitalWrite(ledPin, state);
+}
+