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Serial.pm
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Serial.pm
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package Serial;
# Serial.pm
use strict;
use warnings;
use Device::SerialPort;
use Digest::CRC; # For HDLC CRC.
use Time::HiRes qw(nanosleep);
use Term::ANSIColor;
# Needed for FAP:
use FindBin 1.51 qw( $RealBin );
use lib $RealBin;
# Use custom version of FAP:
use Quantar;
my $OS;
my $SerialPort_Configuration;
my $Apple_Port;
my $Linux_Port;
my $Verbose;
my $SerialPort;
my $Serial_Data = "";
##################################################################
# Serial #########################################################
##################################################################
sub Init {
my ($ConfigFile) = @_;
# Detect Target OS.
$OS = $^O;
print color('green'), "Current OS is $OS\n", color('reset');
# Init Serial Port for HDLC.
print color('green'), "Init Serial Port.\n", color('reset');
my $cfg = Config::IniFiles->new( -file => $ConfigFile);
$SerialPort_Configuration = "SerialConfig.cnf";
$Apple_Port =$cfg->val('Serial', 'Apple_Port');
$Linux_Port =$cfg->val('Serial', 'Linux_Port');
$Verbose =$cfg->val('Serial', 'Verbose');
print " Serial Verbose = $Verbose\n";
# For Mac:
if ($OS eq "darwin") {
$SerialPort = Device::SerialPort->new($Apple_Port) ||
die color('red'), "Cannot Init Serial Port $Apple_Port : $!\n", color('reset');
}
# For Linux:
if ($OS eq "linux") {
#$SerialPort = Device::SerialPort->new('/dev/ttyUSB0') ||
$SerialPort = Device::SerialPort->new($Linux_Port) ||
die color('red'), "Cannot Init Serial Port $Linux_Port : $!\n", color('reset');
}
#$SerialPort->baudrate(19200); # For KM4NNO HDLC Board
$SerialPort->baudrate(115200); # For DVM-V24
$SerialPort->databits(8);
$SerialPort->parity('none');
$SerialPort->stopbits(1);
$SerialPort->handshake('none');
$SerialPort->buffers(4096, 4096);
$SerialPort->datatype('raw');
#$SerialPort->debug(1);
#$SerialPort->write_settings || undef $SerialPort;
#$SerialPort->save($SerialPort_Configuration);
#$TickCount = sprintf("%d", $SerialPort->get_tick_count());
#$FutureTickCount = $TickCount + 5000;
#print " TickCount = $TickCount\n\n";
print color('yellow'),
" To use Raspberry Pi UART you need to disable Bluetooth by editing:\n" .
" nano /boot/config.txt\n" .
" Add line: dtoverlay=pi3-disable-bt-overlay\n", color('reset'),;
print "----------------------------------------------------------------------\n";
}
sub Close {
$SerialPort->close || die "Failed to close SerialPort.\n";
}
sub Read { # Read the serial port, look for 0x7E characters and extract data between them.
my ($NumChars, $Buffer) = $SerialPort->read(255);
if ($NumChars >= 1 ){ #Perl data Arrival test.
print "Serial Str Data Rx len() = " . length($Buffer) . "\n";
#P25Link::Bytes_2_HexString(substr($Buffer, 0, length($Buffer)));
#print "Byte = " . ord(substr($Buffer, 2, 1)) . "\n";
my $DVM_FRAME_START = ord(substr($Buffer, 0, 1));
my $DVM_FRAME_LENGTH = ord(substr($Buffer, 1, 1));
my $DVM_FRAME_CMD = ord(substr($Buffer, 2, 1));
my $DVM_FRAME_SPARE = ord(substr($Buffer, 3, 1));
if ($DVM_FRAME_LENGTH != length($Buffer)) {
print color('red'), "*** Warning *** Serial::Read DVM_FRAME_LENGTH $DVM_FRAME_LENGTH != " . length$Buffer . "\n",
color('reset');
return;
}
if ($DVM_FRAME_START != 0xFE) {
print color('red'), "*** Warning *** Serial::Read DVM_FRAME_START $DVM_FRAME_START != 0xFE\n",
color('reset');
return;
}
if ($DVM_FRAME_CMD == 0x31) {
$Buffer = chr(0xFD) . chr(0x03) . substr($Buffer, 4, length($Buffer) - 4);
#P25Link::Bytes_2_HexString(substr($Buffer, 0, length($Buffer)));
Quantar::HDLC_Rx($Buffer); # Process a full data stream.
}
#P25Link::Bytes_2_HexString($Buffer);
# for (my $x = 0; $x <= $NumChars; $x++) {
# if (ord(substr($Buffer, $x, 1)) == 0x7E) {
# if (length($Serial_Data) > 0) {
#Printer($Serial_Data);
# print color('cyan');
# P25Link::Bytes_2_HexString(Decode_HDLC($Serial_Data));
# print color('reset');
# Quantar::HDLC_Rx(Decode_HDLC($Serial_Data)); # Process a full data stream.
#print "Serial Str Data Rx len() = " . length($Serial_Buffer) . "\n";
#if (length$Serial_Buffer >10) {
# print "Serial Str Data Rx len() = " . length($Serial_Buffer) . "\n";
# P25Link::Bytes_2_HexString(substr($Serial_Buffer, 0, length($SerialBuffer)));
#}
# $Serial_Data = ""; # Clear Rx buffer.
#$Buffer = substr($Buffer, $x, length($Buffer) - $x);
#$x = 0;
# }
# $Serial_Data = ""; # Clear Rx buffer.
# } else {
# Add Bytes until the end of data stream (0x7E):
# $Serial_Data .= substr($Buffer, $x, 1);
# }
# }
}
return "";
}
sub Printer {
my ($Buffer) = @_;
print color('blue'),"Serial Str Data Rx len() = " . length($Buffer) . "\n";
print "Printer:";
P25Link::Bytes_2_HexString($Buffer);
print " End\n", color('reset');
}
sub Tx {
my ($Data) = @_;
#$Data = Encode_HDLC($Data);
#$SerialPort->write($Data . chr(0x7E));
#P25Link::Bytes_2_HexString($Data);
#print color('blue'),"Serial Tx len() = " . length($Data) . "\n";
$Data = substr($Data, 2, length($Data) - 2); # Remove first 2 Bytes for DVM.
$Data = chr(0xFE) . chr(length($Data) + 4) . chr(0x31) . chr(0x00) . $Data; # Add DVM Header.
#print color('blue'),"Serial Tx len(+2) = " . length($Data) . "\n";
#P25Link::Bytes_2_HexString($Data);
$SerialPort->write($Data);
my $SerialWait = (8.0 / 9600.0) * (length($Data) + 2); # Frame length delay.
nanosleep($SerialWait * 1000000000.0);
#if ($Verbose = 2) { print " nanosleep = $SerialWait\n"; }
}
sub Encode_HDLC {
my ($Data) = @_;
my $CRC;
my $MSB;
my $LSB;
#print color('magenta');
#P25Link::Bytes_2_HexString($Data);
#print color('reset');
$CRC = CRC_CCITT_Gen($Data);
$MSB = int($CRC / 256);
$LSB = $CRC - $MSB * 256;
$Data .= chr($MSB) . chr($LSB);
# Byte Stuff
$Data =~ s/\}/\}\]/g; # 0x7D to 0x7D 0x5D
$Data =~ s/\~/\}\^/g; # 0x7E to 0x7D 0x5E
return($Data);
}
sub Decode_HDLC {
my ($Buffer) = @_;
my $Message = "";
# CRC CCITT test patterns:
#my $DataC;
#$DataC = "7EFD01BED27E"; # RR
#$DataC = "7EFD3F430A7E"; # SABM
#$Buffer = chr(0x7E) . chr(0xFD) . chr(0x3F) . chr(0x43) . chr(0x0A) . chr(0x7E);
#$Buffer = chr(0x7E) . chr(0xFD) . chr(0x03) . chr(0x00) . chr(0x00) .
#chr(0x7D) . chr(0x5E) .
#chr(0x11) . chr(0x11) .
#chr(0x7D) . chr(0x5D) . chr(0x22) . chr(0x22) .
#chr(0x7D) . chr(0x45) . chr(0x33) . chr(0x33) .
#chr(0x7E);
#$Buffer = chr(0x7E) . $Buffer . chr(0x7E);
#print "A ", sprintf("0x%x", ord(substr($Buffer, 0, 1))), "\n";
#print "B ", sprintf("0x%x", ord(substr($Buffer, 1, 1))), "\n";
#print "C ", sprintf("0x%x", ord(substr($Buffer, 2, 1))), "\n";
#print "D ", sprintf("0x%x", ord(substr($Buffer, 3, 1))), "\n";
#print "E ", sprintf("0x%x", ord(substr($Buffer, 4, 1))), "\n";
#print "F ", sprintf("0x%x", ord(substr($Buffer, 5, 1))), "\n";
#print "Buffer = $Buffer\n";
#print "Len(Buffer) = ", length($Buffer), "\n";
#my $res = HexStr_2_Str($Buffer);
if (substr($Buffer, 0, 7) eq "!RESET!") {
my $BoardID = ord(substr($Buffer, 7, 1));
warn color('red'), "*** Warning *** HDLC_Rx Board $BoardID made a Reset!\n", color('reset');
return;
}
# Byte Stuff
$Buffer =~ s/\}\^/\~/g; # 0x7D 0x5E to 0x7E
$Buffer =~ s/\}\]/\}/g; # 0x7D 0x5D to 0x7D
#print "Byte Stuff, Len(Buffer) = ", length($Buffer), "\n";
# Show Raw data.
P25Link::Bytes_2_HexString($Buffer);
# CRC CCITT.
if (length($Buffer) < 2) {
print color('red'), "*** Warning *** HDLC_Rx Buffer < 2 Bytes = " . length($Buffer) .
"\n", color('reset');
P25Link::Bytes_2_HexString($Message);
return;
}
$Message = substr($Buffer, 0, length($Buffer) - 2);
#print "Len(Message) = ", length($Message), "\n";
my $CRC_Rx = 256 * ord(substr($Buffer, length($Buffer) - 2, 1 )) +
ord(substr($Buffer, length($Buffer) - 1, 1));
#print "CRC_Rx = $CRC_Rx\n";
if (length($Message) == 0) {
print color('red'), "*** Warning *** HDLC_Rx Message is Null.\n", color('reset');
return;
}
my $CRC_Gen = CRC_CCITT_Gen($Message);
#print "CRC_Gen = $CRC_Gen\n";
#print "CRCH ", sprintf("0x%x", ord(substr($CRC_Gen, 0, 1))), "\n";
#print "CRCL ", sprintf("0x%x", ord(substr($CRC_Gen, 1, 1))), "\n";
#print "Calc CRC16 in hex: ", unpack('H*', pack('S', $Message)), "\n";
if ($CRC_Rx != $CRC_Gen) {
print color('red'), "*** Warning *** HDLC_Rx CRC does not match " . $CRC_Rx . " <> " .
$CRC_Gen . ".\n", color('reset');
return;
}
return($Message);
}
sub CRC_CCITT_Gen {
my ($Buffer) = @_;
my $ctx = Digest::CRC->new(type=>"crcccitt");
$ctx = Digest::CRC->new(width=>16, init=>0xFFFF, xorout=>0xFFFF,
refout=>1, poly=>0x1021, refin=>1, cont=>0);
$ctx->add($Buffer);
my $digest = $ctx->digest;
my $MSB = int($digest / 256);
my $LSB = $digest - $MSB * 256;
$digest = 256 * $LSB + $MSB;
return $digest;
}
sub Reset {
#$serialport->write(chr(0x7D) . chr(0xFF));
$SerialPort->pulse_rts_on(50);
print color('yellow'), "HDLC_Tx_Serial_Reset Sent.\n", color('reset');
}
sub Verbose {
my ($Value) = @_;
$Verbose = $Value;
}
1;