processing/java/libraries/io/src/native/impl.c at master · darkcoderrises/processing · GitHub

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Hardware I/O library developed by Gottfried Haider as part of GSoC 2015

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General

Public License along with this library; if not, write to the

Free Software Foundation, Inc., 59 Temple Place, Suite 330,

Boston, MA 02111-1307 USA

#include <errno.h>

#include <fcntl.h>

#include <jni.h>

#include <linux/i2c.h>

#include <linux/i2c-dev.h>

#include <linux/spi/spidev.h>

#include <poll.h>

#include <stdint.h>

#include <stdlib.h>

#include <string.h>

#include <sys/ioctl.h>

#include <sys/param.h>

#include <unistd.h>

#include "iface.h"

JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_openDevice

(JNIEnv *env, jclass cls, jstring _fn)

{

const char *fn = (*env)->GetStringUTFChars(env, _fn, JNI_FALSE);

int file = open(fn, O_RDWR);

(*env)->ReleaseStringUTFChars(env, _fn, fn);

if (file < 0) {

return -errno;

} else {

return file;

}

JNIEXPORT jstring JNICALL Java_processing_io_NativeInterface_getError

(JNIEnv *env, jclass cls, jint _errno)

{

char *msg = strerror(abs(_errno));

if (msg) {

return (*env)->NewStringUTF(env, msg);

} else {

return NULL;

}

JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_closeDevice

(JNIEnv *env, jclass cls, jint handle)

{

if (close(handle) < 0) {

return -errno;

} else {

return 0;

}

JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_readFile

(JNIEnv *env, jclass cls, jstring _fn, jbyteArray _in)

{

const char *fn = (*env)->GetStringUTFChars(env, _fn, JNI_FALSE);

int file = open(fn, O_RDONLY);

(*env)->ReleaseStringUTFChars(env, _fn, fn);

if (file < 0) {

return -errno;

}

jbyte *in = (*env)->GetByteArrayElements(env, _in, NULL);

int len = read(file, in, (*env)->GetArrayLength(env, _in));

if (len < 0) {

len = -errno;

}

(*env)->ReleaseByteArrayElements(env, _in, in, 0);

close(file);

return len;

}

JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_writeFile

(JNIEnv *env, jclass cls, jstring _fn, jbyteArray _out)

{

const char *fn = (*env)->GetStringUTFChars(env, _fn, JNI_FALSE);

int file = open(fn, O_WRONLY);

(*env)->ReleaseStringUTFChars(env, _fn, fn);

if (file < 0) {

return -errno;

}

jbyte *out = (*env)->GetByteArrayElements(env, _out, JNI_FALSE);

int len = write(file, out, (*env)->GetArrayLength(env, _out));

if (len < 0) {

len = -errno;

}

(*env)->ReleaseByteArrayElements(env, _out, out, JNI_ABORT);

close(file);

return len;

}

JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_pollDevice

(JNIEnv *env, jclass cls, jstring _fn, jint timeout)

{

const char *fn = (*env)->GetStringUTFChars(env, _fn, JNI_FALSE);

int file = open(fn, O_RDONLY|O_NONBLOCK);

(*env)->ReleaseStringUTFChars(env, _fn, fn);

if (file < 0) {

return -errno;

}

// dummy read

char tmp;

while (0 < read(file, &tmp, 1));

struct pollfd fds[1];

memset(fds, 0, sizeof(fds));

fds[0].fd = file;

fds[0].events = POLLPRI|POLLERR;

// and wait

int ret = poll(fds, 1, timeout);

close(file);

if (ret < 0) {

return -errno;

} else if (ret == 0) {

// timeout

return 0;

} else if (fds[0].revents & POLLPRI) {

// interrupt

return 1;

} else {

// POLLERR?

return -ENOMSG;

}

JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_transferI2c

(JNIEnv *env, jclass cls, jint handle, jint slave, jbyteArray _out, jbyteArray _in)

{

struct i2c_rdwr_ioctl_data packets;

struct i2c_msg msgs[2];

jbyte *out, *in;

packets.msgs = msgs;

msgs[0].addr = slave;

msgs[0].flags = 0;

msgs[0].len = (*env)->GetArrayLength(env, _out);

out = (*env)->GetByteArrayElements(env, _out, NULL);

msgs[0].buf = out;

if (_in != NULL) {

in = (*env)->GetByteArrayElements(env, _in, NULL);

msgs[1].addr = slave;

msgs[1].flags = I2C_M_RD; // I2C_M_RECV_LEN is not supported

msgs[1].len = (*env)->GetArrayLength(env, _in);

msgs[1].buf = in;

packets.nmsgs = 2;

} else {

packets.nmsgs = 1;

}

int ret = ioctl(handle, I2C_RDWR, &packets);

if (ret < 0) {

ret = -errno;

}

(*env)->ReleaseByteArrayElements(env, _out, out, JNI_ABORT);

if (_in != NULL) {

(*env)->ReleaseByteArrayElements(env, _in, in, 0);

}

return ret;

}

JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_setSpiSettings

(JNIEnv *env, jclass cls, jint handle, jint _maxSpeed, jint dataOrder, jint mode)

{

uint8_t tmp;

uint32_t maxSpeed;

tmp = (uint8_t)mode;

int ret = ioctl(handle, SPI_IOC_WR_MODE, &tmp);

if (ret < 0) {

return ret;

}

tmp = (uint8_t)dataOrder;

ret = ioctl(handle, SPI_IOC_WR_LSB_FIRST, &tmp);

if (ret < 0) {

return ret;

}

maxSpeed = (uint32_t)_maxSpeed;

ret = ioctl(handle, SPI_IOC_WR_MAX_SPEED_HZ, &maxSpeed);

if (ret < 0) {

return ret;

}

return 0;

}

JNIEXPORT jint JNICALL Java_processing_io_NativeInterface_transferSpi

(JNIEnv *env, jclass cls, jint handle, jbyteArray _out, jbyteArray _in)

{

jbyte* out = (*env)->GetByteArrayElements(env, _out, NULL);

jbyte* in = (*env)->GetByteArrayElements(env, _in, NULL);

struct spi_ioc_transfer xfer = {

.tx_buf = (unsigned long)out,

.rx_buf = (unsigned long)in,

.len = MIN((*env)->GetArrayLength(env, _out), (*env)->GetArrayLength(env, _in)),

};

int ret = ioctl(handle, SPI_IOC_MESSAGE(1), &xfer);

(*env)->ReleaseByteArrayElements(env, _out, out, JNI_ABORT);

(*env)->ReleaseByteArrayElements(env, _in, in, 0);

return ret;

}

processing/java/libraries/io/src/native/impl.c at master · darkcoderrises/processing · GitHub

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