NubeIO / iot-engine

IoT Engine

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Open RaiBnod opened 5 years ago

RaiBnod commented 5 years ago

GPIO functionalities will be written on C/C++. And we need able to call that functions from Java for doing GPIO operations.

Parent ticket: #42

RaiBnod commented 5 years ago

Hello @Aidan275, as you already did some code on C for doing GPIO operation. Can you please share the code.

I have created just a base class for generating the JNI libraries for doing communication with native C on commit: https://github.com/NubeIO/iot-engine/commit/d72c5204f26825abbafdf17bd4ea08d5ed4972d4.

RaiBnod commented 5 years ago

Adding additional info:

BBBiO example: https://github.com/Aidan275/BBBiO Parent ticket: https://github.com/NubeIO/NubeEdge28/issues/1

RaiBnod commented 5 years ago

@Aidan275 I had forked your C++ code and did small changes https://github.com/RaiBnod/BBBiO for testing. And for Java JNI call, I had made a Java micro-service base https://github.com/NubeIO/iot-engine/commit/478e478095eb1d2cd1c0144c3ae46e47080dcd56, where we can generate native library. With the help of the native build library and that Java native functional interface we can able to communicate with C.

But currently, it only supports digital read/write operations. And still we following todo tasks to complete on C:

setPinMode - Configures the mode of a pin
analogWrite - Write a PWM signal to an analog output pin
analogRead - Read the voltage at an analog input pin
attachInterrupt - Attaches an interrupt handler to detect changes on a digital input pin
detatchInterrupt - Remove an interrupt handler

Could you please help me on this.

cooperbrindle commented 5 years ago

Additional Information

Prepare C/C++ code (SPI/PWM/GPIO of BBB) with APIs which can be called from Java (http://jonisalonen.com/2012/calling-c-from-java-is-easy)

Main functions needed at the moment are:

setPinMode - Configures the mode of a pin
digitalWrite - Write a HIGH or LOW to a digital output pin
digitalRead - Read the status of a digital input pin
analogWrite - Write a PWM signal to an analog output pin
analogRead - Read the voltage at an analog input pin
attachInterrupt - Attaches an interrupt handler to detect changes on a digital input pin
detatchInterrupt - Remove an interrupt handler

Resources:

zero88 commented 5 years ago

Java need to provide interface and build a header file then C++ implementation should be in https://github.com/NubeIO/BBBiO

zero88 commented 5 years ago