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gohaigohai
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Add I/O library for Raspberry Pi and similar Linux-based micro computers
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‎java/libraries/io/build.xml‎

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<?xml version="1.0"?>
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<project name="Processing I/O Library" default="build">
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<target name="clean" description="Clean the build directories">
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<delete dir="bin" />
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<delete file="library/io.jar" />
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</target>
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<target name="compile" description="Compile sources">
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<condition property="core-built">
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<available file="../../../core/library/core.jar" />
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</condition>
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<fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
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<mkdir dir="bin" />
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<javac source="1.7"
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target="1.7"
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srcdir="src" destdir="bin"
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encoding="UTF-8"
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includeAntRuntime="false"
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classpath="../../../core/library/core.jar"
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nowarn="true"
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compiler="org.eclipse.jdt.core.JDTCompilerAdapter">
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<compilerclasspath path="../../mode/org.eclipse.jdt.core.jar;
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../../mode/jdtCompilerAdapter.jar" />
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</javac>
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</target>
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<target name="build" depends="compile" description="Build I/O library">
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<jar basedir="bin" destfile="library/io.jar" />
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</target>
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</project>

‎java/libraries/io/library.properties‎

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name = I/O
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version = 1

‎java/libraries/io/library/export.txt‎

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name = I/O for Raspberry Pi and other Linux-based computers

‎java/libraries/io/library/linux-armv6hf/libprocessing-io.so‎

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‎java/libraries/io/library/linux32/libprocessing-io.so‎

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‎java/libraries/io/library/linux64/libprocessing-io.so‎

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‎java/libraries/io/src/native/Makefile‎

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TARGET := libprocessing-io.so
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OBJS := impl.o
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CC := gcc
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CFLAGS := -std=c99 -fPIC -g
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CFLAGS += -I$(shell dirname $(shell realpath $(shell which javac)))/../include
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CFLAGS += -I$(shell dirname $(shell realpath $(shell which javac)))/../include/linux
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LDFLAGS := -shared
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$(TARGET): $(OBJS)
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$(CC) $(CFLAGS) $(LDFLAGS) $^ -o $@
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iface.h:
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javah -classpath .. -o iface.h processing.io.NativeInterface
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clean:
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rm -f $(TARGET) $(OBJS)

‎java/libraries/io/src/native/iface.h‎

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‎java/libraries/io/src/native/impl.c‎

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/*
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Copyright (c) The Processing Foundation 2015
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I/O library developed by Gottfried Haider as part of GSOC 2015
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General
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Public License along with this library; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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Boston, MA 02111-1307 USA
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <jni.h>
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#include <linux/i2c.h>
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#include <linux/i2c-dev.h>
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#include <linux/spi/spidev.h>
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#include <poll.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <unistd.h>
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#include "iface.h"
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JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_openDevice
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(JNIEnv *env, jclass cls, jstring _fn)
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{
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const char *fn = (*env)->GetStringUTFChars(env, _fn, JNI_FALSE);
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int file = open(fn, O_RDWR);
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(*env)->ReleaseStringUTFChars(env, _fn, fn);
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if (file < 0) {
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return -errno;
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} else {
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return file;
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}
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}
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JNIEXPORT jstring JNICALL Java_processing_io_NativeInterface_getError
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(JNIEnv *env, jclass cls, jint _errno)
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{
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char *msg = strerror(abs(_errno));
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if (msg) {
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return (*env)->NewStringUTF(env, msg);
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} else {
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return NULL;
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}
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}
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JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_closeDevice
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(JNIEnv *env, jclass cls, jint handle)
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{
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if (close(handle) < 0) {
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return -errno;
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} else {
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return 0;
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}
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}
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JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_readFile
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(JNIEnv *env, jclass cls, jstring _fn, jbyteArray _in)
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{
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const char *fn = (*env)->GetStringUTFChars(env, _fn, JNI_FALSE);
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int file = open(fn, O_RDONLY);
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(*env)->ReleaseStringUTFChars(env, _fn, fn);
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if (file < 0) {
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return -errno;
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}
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jbyte *in = (*env)->GetByteArrayElements(env, _in, NULL);
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int len = read(file, in, (*env)->GetArrayLength(env, _in));
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if (len < 0) {
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len = -errno;
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}
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(*env)->ReleaseByteArrayElements(env, _in, in, 0);
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close(file);
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return len;
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}
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JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_writeFile
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(JNIEnv *env, jclass cls, jstring _fn, jbyteArray _out)
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{
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const char *fn = (*env)->GetStringUTFChars(env, _fn, JNI_FALSE);
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int file = open(fn, O_WRONLY);
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(*env)->ReleaseStringUTFChars(env, _fn, fn);
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if (file < 0) {
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return -errno;
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}
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jbyte *out = (*env)->GetByteArrayElements(env, _out, JNI_FALSE);
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int len = write(file, out, (*env)->GetArrayLength(env, _out));
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if (len < 0) {
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len = -errno;
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}
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(*env)->ReleaseByteArrayElements(env, _out, out, JNI_ABORT);
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close(file);
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return len;
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}
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JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_pollDevice
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(JNIEnv *env, jclass cls, jstring _fn, jint timeout)
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{
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const char *fn = (*env)->GetStringUTFChars(env, _fn, JNI_FALSE);
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int file = open(fn, O_RDONLY|O_NONBLOCK);
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(*env)->ReleaseStringUTFChars(env, _fn, fn);
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if (file < 0) {
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return -errno;
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}
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// dummy read
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char tmp;
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while (0 < read(file, &tmp, 1));
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struct pollfd fds[1];
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memset(fds, 0, sizeof(fds));
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fds[0].fd = file;
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fds[0].events = POLLPRI|POLLERR;
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// and wait
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int ret = poll(fds, 1, timeout);
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close(file);
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if (ret < 0) {
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return -errno;
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} else if (ret == 0) {
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// timeout
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return 0;
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} else if (fds[0].revents & POLLPRI) {
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// interrupt
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return 1;
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} else {
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// POLLERR?
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return -ENOMSG;
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}
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}
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JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_transferI2c
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(JNIEnv *env, jclass cls, jint handle, jint slave, jbyteArray _out, jbyteArray _in)
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{
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struct i2c_rdwr_ioctl_data packets;
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struct i2c_msg msgs[2];
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jbyte *out, *in;
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packets.msgs = msgs;
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msgs[0].addr = slave;
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msgs[0].flags = 0;
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msgs[0].len = (*env)->GetArrayLength(env, _out);
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out = (*env)->GetByteArrayElements(env, _out, NULL);
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msgs[0].buf = out;
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if (_in != NULL) {
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in = (*env)->GetByteArrayElements(env, _in, NULL);
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msgs[1].addr = slave;
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msgs[1].flags = I2C_M_RD; // I2C_M_RECV_LEN is not supported
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msgs[1].len = (*env)->GetArrayLength(env, _in);
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msgs[1].buf = in;
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packets.nmsgs = 2;
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} else {
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packets.nmsgs = 1;
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}
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int ret = ioctl(handle, I2C_RDWR, &packets);
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if (ret < 0) {
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ret = -errno;
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}
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(*env)->ReleaseByteArrayElements(env, _out, out, JNI_ABORT);
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if (_in != NULL) {
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(*env)->ReleaseByteArrayElements(env, _in, in, 0);
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}
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return ret;
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}
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JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_setSpiSettings
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(JNIEnv *env, jclass cls, jint handle, jint _maxSpeed, jint dataOrder, jint mode)
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{
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uint8_t tmp;
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uint32_t maxSpeed;
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tmp = (uint8_t)mode;
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int ret = ioctl(handle, SPI_IOC_WR_MODE, &tmp);
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if (ret < 0) {
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return ret;
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}
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tmp = (uint8_t)dataOrder;
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ret = ioctl(handle, SPI_IOC_WR_LSB_FIRST, &tmp);
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if (ret < 0) {
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return ret;
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}
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maxSpeed = (uint32_t)_maxSpeed;
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ret = ioctl(handle, SPI_IOC_WR_MAX_SPEED_HZ, &maxSpeed);
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if (ret < 0) {
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return ret;
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}
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return 0;
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}
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JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_transferSpi
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(JNIEnv *env, jclass cls, jint handle, jbyteArray _out, jbyteArray _in)
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{
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jbyte* out = (*env)->GetByteArrayElements(env, _out, NULL);
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jbyte* in = (*env)->GetByteArrayElements(env, _in, NULL);
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struct spi_ioc_transfer xfer = {
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.tx_buf = (unsigned long)out,
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.rx_buf = (unsigned long)in,
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.len = MIN((*env)->GetArrayLength(env, _out), (*env)->GetArrayLength(env, _in)),
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};
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int ret = ioctl(handle, SPI_IOC_MESSAGE(1), &xfer);
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(*env)->ReleaseByteArrayElements(env, _out, out, JNI_ABORT);
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(*env)->ReleaseByteArrayElements(env, _in, in, 0);
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return ret;
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}

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