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mod_i2c_lib.php
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mod_i2c_lib.php
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<?php
/*
* Copyright (c) 2016, Andrey_B
* http://ab-log.ru
* Подробнее см. LICENSE.txt или http://www.gnu.org/licenses/
*/
/*
Библиотека I2C-PHP для MegaD-328
Ver: 1.1 (2016-02-21)
*/
define("HIGH", 1);
define("LOW", 0);
function i2c_init()
{
i2c_dir(SCL, "OUT");
i2c_dir(SDA, "OUT");
file_get_contents(MD."cmd=".SCL.":".HIGH.";".SDA.":".HIGH);
}
function i2c_start()
{
file_get_contents(MD."cmd=".SDA.":".LOW.";".SCL.":".LOW);
}
function i2c_stop()
{
//file_get_contents(MD."cmd=".SCL.":".HIGH);
//file_get_contents(MD."cmd=".SCL.":".LOW);
file_get_contents(MD."cmd=".SDA.":".LOW.";".SCL.":".HIGH.";".SDA.":".HIGH);
}
function i2c_dir($port, $dir)
{
if ( $dir == "OUT" )
$dir = 1;
else
$dir = 0;
file_get_contents(MD."pt=$port&dir=$dir");
}
function i2c_send($data)
{
if ( defined("V") && V == 2 )
{
//if ( V == 2 )
file_get_contents(MD."pt=".SDA."&i2c=".hexdec($data)."&scl=".SCL.":1;".SCL.":0;");
//file_get_contents(MD."pt=11&i2c=".hexdec($data)."&scl=10:1;10:0;");
}
else
{
$data_bin = decbin(hexdec($data));
$len = strlen($data_bin);
for ( $i = 8; $i > $len; $i-- )
$data_bin = "0".$data_bin;
$old_bit = 3;
$cmd = "";
$cnt = 0;
for ( $i = 0; $i < 8; $i++ )
{
// Вариант 1
//file_get_contents(MD."cmd=".SDA.":".$data_bin[$i]);
//file_get_contents(MD."cmd=".SCL.":".HIGH);
//file_get_contents(MD."cmd=".SCL.":".LOW);
//file_get_contents(MD."cmd=".SDA.":".LOW);
// Вариант 2
file_get_contents(MD."cmd=".SDA.":".$data_bin[$i].";".SCL.":".HIGH.";".SCL.":".LOW.";".SDA.":".LOW);
/*
// Вариант 3 - отправляем сразу 2 бита
$cmd .= SDA.":".$data_bin[$i].";".SCL.":".HIGH.";".SCL.":".LOW.";".SDA.":".LOW.";";
$cnt++;
if ( $cnt == 2 )
{
file_get_contents(MD."cmd=$cmd");
$cnt = 0;
$cmd = "";
}
*/
}
// Вариант 1
//i2c_dir(SDA, "IN");
//file_get_contents(MD."cmd=".SCL.":".HIGH);
//$ack = file_get_contents(MD."pt=".SDA."&cmd=get")."\n";
//file_get_contents(MD."cmd=".SCL.":".LOW);
//echo $ack;
// Вариант 2
file_get_contents(MD."pt=".SDA."&dir=0&cmd=".SCL.":".HIGH.";".SCL.":".LOW);
$ack = file_get_contents(MD."pt=".SDA."&cmd=get&dir=1");
return $ack;
}
}
function i2c_read($nack = 0)
{
$data_bits = "";
$bit = "";
file_get_contents(MD."pt=".SDA."&dir=0&cmd=".SCL.":".LOW);
//file_get_contents(MD."cmd=".SCL.":".LOW);
for ( $i = 0; $i < 8; $i++ )
{
file_get_contents(MD."cmd=".SCL.":".HIGH);
$bit = file_get_contents(MD."pt=".SDA."&cmd=get");
if ( $bit == "ON" )
$data_bits .= "0";
else
$data_bits .= "1";
file_get_contents(MD."cmd=".SCL.":".LOW);
}
i2c_dir(SDA, "OUT");
file_get_contents(MD."cmd=".SCL.":".HIGH);
if ( $nack == 1 )
file_get_contents(MD."cmd=".SDA.":".HIGH);
//file_get_contents(MD."cmd=".SCL.":".LOW);
//i2c_dir(SDA, "IN");
file_get_contents(MD."pt=".SDA."&dir=0&cmd=".SCL.":".LOW);
//return dechex(bindec($data_bits))." - $data_bits\n";
return dechex(bindec($data_bits));
}