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processing/java/libraries/io/src/processing/io/I2C.java at master · sbuscemi/processing · GitHub
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I2C.java
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processing
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java
/
libraries
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processing
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io
/
I2C.java
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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
Copyright (c) The Processing Foundation 2015
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
*/
package
processing
.
io
;
import
processing
.
io
.
NativeInterface
;
import
java
.
io
.
File
;
import
java
.
util
.
ArrayList
;
import
java
.
util
.
Arrays
;
/**
* @webref
*/
public
class
I2C
{
protected
String
dev
;
protected
int
handle
;
protected
int
slave
;
protected
byte
[]
out
;
protected
boolean
transmitting
;
/**
* Opens an I2C interface as master
* @param dev interface name
* @see list
* @webref
*/
public
I2C
(
String
dev
) {
NativeInterface
.
loadLibrary
();
this
.
dev
=
dev
;
if
(
NativeInterface
.
isSimulated
()) {
return
;
}
handle
=
NativeInterface
.
openDevice
(
"/dev/"
+
dev
);
if
(
handle
<
0
) {
throw
new
RuntimeException
(
NativeInterface
.
getError
(
handle
));
}
}
/**
* Begins a transmission to an attached device
* @see write
* @see read
* @see endTransmission
* @webref
*/
public
void
beginTransmission
(
int
slave
) {
// addresses 120 (0x78) to 127 are additionally reserved
if
(
0x78
<=
slave
) {
System
.
err
.
println
(
"beginTransmission expects a 7 bit address, try shifting one bit to the right"
);
throw
new
IllegalArgumentException
(
"Illegal address"
);
}
this
.
slave
=
slave
;
transmitting
=
true
;
out
=
null
;
}
/**
* Closes the I2C device
* @webref
*/
public
void
close
() {
if
(
NativeInterface
.
isSimulated
()) {
return
;
}
NativeInterface
.
closeDevice
(
handle
);
handle
=
0
;
}
protected
void
finalize
()
throws
Throwable
{
try
{
close
();
}
finally
{
super
.
finalize
();
}
}
/**
* Ends the current transmissions
* @see beginTransmission
* @see write
* @webref
*/
public
void
endTransmission
() {
if
(!
transmitting
) {
// silently ignore this case
return
;
}
if
(
NativeInterface
.
isSimulated
()) {
return
;
}
// implement these flags if needed: https://github.com/raspberrypi/linux/blob/rpi-patches/Documentation/i2c/i2c-protocol
int
ret
=
NativeInterface
.
transferI2c
(
handle
,
slave
,
out
,
null
);
transmitting
=
false
;
out
=
null
;
if
(
ret
<
0
) {
if
(
ret
== -
5
|
ret
== -
121
) {
// EIO | EREMOTEIO
System
.
err
.
println
(
"The device did not respond. Check the cabling and whether you are using the correct address."
);
}
throw
new
RuntimeException
(
NativeInterface
.
getError
(
ret
));
}
}
/**
* Lists all available I2C interfaces
* @return String array
* @webref
*/
public
static
String
[]
list
() {
if
(
NativeInterface
.
isSimulated
()) {
// as on the Raspberry Pi
return
new
String
[]{
"i2c-1"
};
}
ArrayList
<
String
>
devs
=
new
ArrayList
<
String
>();
File
dir
=
new
File
(
"/dev"
);
File
[]
files
=
dir
.
listFiles
();
if
(
files
!=
null
) {
for
(
File
file
:
files
) {
if
(
file
.
getName
().
startsWith
(
"i2c-"
)) {
devs
.
add
(
file
.
getName
());
}
}
}
// listFiles() does not guarantee ordering
String
[]
tmp
=
devs
.
toArray
(
new
String
[
devs
.
size
()]);
Arrays
.
sort
(
tmp
);
return
tmp
;
}
/**
* Reads bytes from the attached device
* @param len number of bytes to read
* @return bytes read from device
* @see beginTransmission
* @see write
* @see endTransmission
* @webref
*/
public
byte
[]
read
(
int
len
) {
if
(!
transmitting
) {
throw
new
RuntimeException
(
"beginTransmisson has not been called"
);
}
byte
[]
in
=
new
byte
[
len
];
if
(
NativeInterface
.
isSimulated
()) {
return
in
;
}
int
ret
=
NativeInterface
.
transferI2c
(
handle
,
slave
,
out
,
in
);
transmitting
=
false
;
out
=
null
;
if
(
ret
<
0
) {
if
(
ret
== -
5
|
ret
== -
121
) {
// EIO | EREMOTEIO
System
.
err
.
println
(
"The device did not respond. Check the cabling and whether you are using the correct address."
);
}
throw
new
RuntimeException
(
NativeInterface
.
getError
(
ret
));
}
return
in
;
}
/**
* Adds bytes to be written to the device
* @param out bytes to be written
* @see beginTransmission
* @see read
* @see endTransmission
* @webref
*/
public
void
write
(
byte
[]
out
) {
if
(!
transmitting
) {
throw
new
RuntimeException
(
"beginTransmisson has not been called"
);
}
if
(
this
.
out
==
null
) {
this
.
out
=
out
;
}
else
{
byte
[]
tmp
=
new
byte
[
this
.
out
.
length
+
out
.
length
];
System
.
arraycopy
(
this
.
out
,
0
,
tmp
,
0
,
this
.
out
.
length
);
System
.
arraycopy
(
out
,
0
,
tmp
,
this
.
out
.
length
,
out
.
length
);
this
.
out
=
tmp
;
}
}
/**
* Adds bytes to be written to the attached device
* @param out string to be written
* @see beginTransmission
* @see read
* @see endTransmission
*/
public
void
write
(
String
out
) {
write
(
out
.
getBytes
());
}
/**
* Adds a byte to be written to the attached device
* @param out single byte to be written, e.g. numeric literal (0 to 255, or -128 to 127)
* @see beginTransmission
* @see read
* @see endTransmission
*/
public
void
write
(
int
out
) {
if
(
out
< -
128
||
255
<
out
) {
System
.
err
.
println
(
"The write function can only operate on a single byte at a time. Call it with a value from 0 to 255, or -128 to 127."
);
throw
new
RuntimeException
(
"Argument does not fit into a single byte"
);
}
byte
[]
tmp
=
new
byte
[
1
];
tmp
[
0
] = (
byte
)
out
;
write
(
tmp
);
}
/**
* Adds a byte to be written to the attached device
* @param out single byte to be written
* @see beginTransmission
* @see read
* @see endTransmission
*/
public
void
write
(
byte
out
) {
// cast to (unsigned) int
write
(
out
&
0xff
);
}
}
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