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i2c support: Add sample
* Adds a very basic examples to demonstrate that i2c works using Wire library. * This sample is a demo over ADXL345 sensor and prints x,y,z values to the console over TX pin of the arduino. * Sample has been built and tested and we should get an output similar to below: ``` *** Booting Zephyr OS build zephyr-v3.1.0-3162-gbe1380cc51bd *** Setup begins Setup COMPLETE X = -0.012000 Y = -0.056000 Z = 0.876000 X = -0.008000 Y = -0.060000 Z = 0.876000 ``` * Changing the orientation of the sensor by tilting it right, left up and down we get corresponding changes in the X, Y and Z values. * Errors are printed incase there are improper connections as below: ``` ERR: i2c burst read fails ``` * Currently this sample is a very very basic demo which yet doesn't demonstrate how this project can leverage another arduino IDE - specific library, but it's a start, a promising one! * In future, this sample maybe replaced with a proper arduino library based example. Signed-off-by: Dhruva Gole <[email protected]>
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‎samples/i2cdemo/CMakeLists.txt

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# SPDX-License-Identifier: Apache-2.0
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cmake_minimum_required(VERSION 3.20.0)
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set(DTC_OVERLAY_FILE $ENV{HOME}/zephyrproject/modules/lib/Arduino-Zephyr-API/variants/ARDUINO_NANO33BLE/arduino_nano_33_ble.overlay)
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find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
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project(blinky)
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target_sources(app PRIVATE src/main.cpp)
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zephyr_compile_options(-Wno-unused-variable -Wno-comment)

‎samples/i2cdemo/README.rst

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.. _blinky-sample:
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Blinky
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######
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Overview
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********
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This Arduino Blinky sample blinks an LED forever using the `ArduinoAPI`.
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Requirements
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************
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Your board must:
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#. Have an LED connected via a GPIO pin (these are called "User LEDs" on many of
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Zephyr's :ref:`boards`).
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#. Have the LED configured using the ``led0`` devicetree alias.
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Building and Running
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********************
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Build and flash Blinky as follows,
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```sh
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$> west build -p -b arduino_nano_33_ble samples/basic/arduino-blinky/ -DZEPHYR_EXTRA_MODULES=/home/$USER/zephyrproject/modules/lib/Arduino-Core-Zephyr
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$> west flash --bossac=/home/$USER/.arduino15/packages/arduino/tools/bossac/1.9.1-arduino2/bossac
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```
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After flashing, the LED starts to blink. If a runtime error occurs, the sample
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exits without printing to the console.
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Adding board support
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********************
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To add support for your board, add something like this to your devicetree:
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.. code-block:: DTS
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/ {
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aliases {
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led0 = &myled0;
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};
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leds {
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compatible = "gpio-leds";
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myled0: led_0 {
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gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
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};
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};
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};
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The above sets your board's ``led0`` alias to use pin 13 on GPIO controller
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``gpio0``. The pin flags :c:macro:`GPIO_ACTIVE_HIGH` mean the LED is on when
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the pin is set to its high state, and off when the pin is in its low state.
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Tips:
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- See :dtcompatible:`gpio-leds` for more information on defining GPIO-based LEDs
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in devicetree.
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- If you're not sure what to do, check the devicetrees for supported boards which
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use the same SoC as your target. See :ref:`get-devicetree-outputs` for details.
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- See :zephyr_file:`include/zephyr/dt-bindings/gpio/gpio.h` for the flags you can use
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in devicetree.
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- If the LED is built in to your board hardware, the alias should be defined in
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your :ref:`BOARD.dts file <devicetree-in-out-files>`. Otherwise, you can
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define one in a :ref:`devicetree overlay <set-devicetree-overlays>`.

‎samples/i2cdemo/prj.conf

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CONFIG_GPIO=y
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CONFIG_CPLUSPLUS=y
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CONFIG_ARDUINO_API=y
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CONFIG_I2C=y
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CONFIG_NEWLIB_LIBC=y
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CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
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CONFIG_RING_BUFFER=y

‎samples/i2cdemo/sample.yaml

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sample:
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name: Blinky Sample
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tests:
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sample.basic.blinky:
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tags: LED gpio
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filter: dt_enabled_alias_with_parent_compat("led0", "gpio-leds")
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depends_on: gpio
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harness: led
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integration_platforms:
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- frdm_k64f

‎samples/i2cdemo/src/main.cpp

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/* Blink inbuilt LED example */
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#include <Arduino.h>
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#include "Wire.h"
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void setup()
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{
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printf("\n\nSetup begins\n");
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Wire.begin();
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// initialize the LED pin as an output:
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// initialize the pushbutton pin as an input:
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// pinMode(buttonPin, INPUT);
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// pinMode(ledPin, OUTPUT);
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Wire.beginTransmission(0x53);
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Wire.write(0x2C);
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Wire.write(0x08);
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Wire.endTransmission();
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Wire.beginTransmission(0x53);
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Wire.write(0x31);
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Wire.write(0x08);
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Wire.endTransmission();
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Wire.beginTransmission(0x53);
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Wire.write(0x2D);
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Wire.write(0x08);
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Wire.endTransmission();
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printf("\n\nSetup COMPLETE\n\n\n");
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}
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void loop()
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{
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Wire.beginTransmission(0x53);
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Wire.write(0x32);
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Wire.endTransmission();
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// printf("\n\nrequesting from 53\n\n\n");
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Wire.requestFrom(0x53, 1);
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byte x0 = Wire.read();
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Wire.beginTransmission(0x53);
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Wire.write(0x33);
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Wire.endTransmission();
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Wire.requestFrom(0x53, 1);
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byte x1 = Wire.read();
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x1 = x1 & 0x03;
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uint16_t x = (x1 << 8) + x0;
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int16_t xf = x;
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if(xf > 511)
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{
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xf = xf - 1024;
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}
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float xa = xf * 0.004;
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printf("\n\nX = %f\n",xa);
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// Serial.print("X = ");
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// Serial.print(xa);
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// Serial.print(" g");
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// Serial.println();
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Wire.beginTransmission(0x53);
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Wire.write(0x34);
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Wire.endTransmission();
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Wire.requestFrom(0x53, 1);
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byte y0 = Wire.read();
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Wire.beginTransmission(0x53);
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Wire.write(0x35);
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Wire.endTransmission();
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Wire.requestFrom(0x53, 1);
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byte y1 = Wire.read();
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y1 = y1 & 0x03;
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uint16_t y = (y1 << 8) + y0;
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int16_t yf = y;
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if(yf > 511)
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{
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yf = yf - 1024;
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}
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float ya = yf * 0.004;
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// printk("Y = %f\n",ya);
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printf("Y = %f\n",ya);
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// printf("\n\nYa = %f\n\n\n",ya);
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// Serial.print("Y = ");
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// Serial.print(ya);
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// Serial.print(" g");
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// Serial.println();
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Wire.beginTransmission(0x53);
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Wire.write(0x36);
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Wire.endTransmission();
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Wire.requestFrom(0x53, 1);
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byte z0 = Wire.read();
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Wire.beginTransmission(0x53);
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Wire.write(0x37);
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Wire.endTransmission();
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Wire.requestFrom(0x53, 1);
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byte z1 = Wire.read();
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z1 = z1 & 0x03;
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uint16_t z = (z1 << 8) + z0;
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int16_t zf = z;
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if(zf > 511)
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{
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zf = zf - 1024;
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}
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float za = zf * 0.004;
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printf("Z = %f\n\n",za);
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// Serial.print("Z = ");
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// Serial.print(za);
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// Serial.print(" g");
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// Serial.println();
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// Serial.println();
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delay(500);
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}

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