jlengrand

name: Java CI with Maven

on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]

jobs:
  build:

jlengrand

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <groupId>nl.lengrand</groupId>
    <version>1.1</version>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>cellar-driver</artifactId>

jlengrand

INCLUDES = -I. -I../java  -Iadafruit/Raspberry_Pi_2 -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/linux -I$(JAVA_HOME)/include/darwin
HEADERS = ../../../target/headers/nl_lengrand_cellar_Dht11Driver.h adafruit/common_dht_read.h adafruit/Raspberry_Pi_2/pi_2_mmio.h adafruit/Raspberry_Pi_2/pi_2_dht_read.h
FILES = adafruit/common_dht_read.c adafruit/Raspberry_Pi_2/pi_2_mmio.c adafruit/Raspberry_Pi_2/pi_2_dht_read.c Dht11Driver.c
OUT = libdht11

default: library copy

program: Dht11Driver.c
	arm-linux-gnueabihf-gcc -Wall $(INCLUDES) $(HEADERS) $(FILES) -o $(OUT)

jlengrand

package nl.lengrand.cellar;

public class TestLib {

    public static void main(String[] args) throws InterruptedException {
        Dht11Driver theDriver = new Dht11Driver();

        System.out.println("Hello JNI!");
        for (int i = 0; i < 5; i++) {
            float [] res = theDriver.getTemperatureAndHumidity();

jlengrand

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <jni.h>
#include "../../../target/headers/nl_lengrand_cellar_Dht11Driver.h"
#include "adafruit/Raspberry_Pi_2/pi_2_dht_read.h"

JNIEXPORT jfloatArray JNICALL Java_nl_lengrand_cellar_Dht11Driver_getTemperatureAndHumidity(JNIEnv *env, jobject thisObj){
    float humidity = 0, temperature = 0;

jlengrand

package nl.lengrand.cellar;

public class Dht11Driver {

    static {
        System.loadLibrary("dht11");
    }

    public native float[] getTemperatureAndHumidity();
}

jlengrand

float humidity = 0, temperature = 0;
int sensor = 11;int pin = 4;
pi_2_dht_read(sensor, pin, &humidity, &temperature);
printf("Temperature : %f\n", temperature);
printf("Humidity : %f\n", humidity);

jlengrand

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>

#include "adafruit/Raspberry_Pi_2/pi_2_dht_read.h"

int main( void )
{
	printf( "Raspberry Pi 2 DHT11 test program\n" );

jlengrand

import com.pi4j.wiringpi.Gpio;
import com.pi4j.wiringpi.GpioUtil;

public class DHT11 {
    private static final int    MAXTIMINGS  = 85;
    private final int[]         dht11_dat   = { 0, 0, 0, 0, 0 };

    public DHT11() {

        GpioUtil.export(3, GpioUtil.DIRECTION_OUT);

jlengrand

$ java -version
openjdk version "14" 2020-03-17
OpenJDK Runtime Environment AdoptOpenJDK (build 14+36)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 14+36, mixed mode, sharing)
$ jpackage
WARNING: Using incubator modules: jdk.incubator.jpackage
Usage: jpackage <options>
Use jpackage --help (or -h) for a list of possible options