1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
#########################################################################################
# Package HiPi::Interface::HobbyTronicsBackpackV2
# Description : HobbyTronics BackpackV2 LCD Controller
# Copyright : Copyright (c) 2013-2017 Mark Dootson
# License : This is free software; you can redistribute it and/or modify it under
# the same terms as the Perl 5 programming language system itself.
#########################################################################################
package HiPi::Interface::HobbyTronicsBackpackV2;
#########################################################################################
use strict;
use warnings;
use parent qw( HiPi::Interface::Common::HD44780 );
use Carp;
use HiPi qw( :rpi :lcd );
use HiPi::RaspberryPi;
our $VERSION ='0.81';
__PACKAGE__->create_accessors( qw( devicetype address devicename backend ) );
sub new {
my( $class, %userparams) = @_;
# handle deprecated devicetype param
if ( defined($userparams{devicetype}) && !defined($userparams{backend}) ) {
$userparams{backend} = $userparams{devicetype};
}
my $pi = HiPi::RaspberryPi->new();
my %params = (
# LCD
width => undef,
lines => undef,
backlightcontrol => 0,
device => undef,
positionmap => undef,
serialbuffermode => 1,
# RX or i2c
backend => 'serialrx', # alt [serialrx|i2c|smbus]
address => undef,
devicename => undef,
# SerialRX params
baudrate => 9600,
parity => 'none',
stopbits => 1,
databits => 8,
serial_devicename => '/dev/ttyAMA0',
# i2c params
i2c_address => 0x3A,
i2c_devicename => ( $pi->board_type == RPI_BOARD_TYPE_1 ) ? '/dev/i2c-0' : '/dev/i2c-1',
);
# get user params
foreach my $key( keys (%userparams) ) {
$params{$key} = $userparams{$key};
}
# handle deprecated devicetype
$userparams{devicetype} = $userparams{backend};
unless( defined($params{device}) ) {
if( lc($params{backend}) eq 'serialrx' ) {
$params{devicename} = $params{serial_devicename} unless $params{devicename};
# set a default port
my %devparams;
for (qw( devicename baudrate parity stopbits databits ) ) {
$devparams{$_} = $params{$_};
}
require HiPi::Device::SerialPort;
$params{device} = HiPi::Device::SerialPort->new(%devparams);
} elsif( $params{backend} eq 'bcm2835' ) {
require HiPi::BCM2835::I2C;
$params{devicename} = $params{i2c_devicename} unless $params{devicename};
$params{address} = $params{i2c_address} unless defined($params{address});
$params{device} = HiPi::BCM2835::I2C->new(
address => $params{address},
peripheral => ( $params{devicename} eq '/dev/i2c-0' ) ? HiPi::BCM2835::I2C::BB_I2C_PERI_0() : HiPi::BCM2835::I2C::BB_I2C_PERI_1(),
);
} elsif( $params{backend} =~ /^(i2c|smbus)$/i ) {
$params{devicename} = $params{i2c_devicename} unless $params{devicename};
$params{address} = $params{i2c_address} unless defined($params{address});
require HiPi::Device::I2C;
$params{device} = HiPi::Device::I2C->new(
devicename => $params{devicename},
address => $params{address},
busmode => $params{backend},
);
}
}
my $self = $class->SUPER::new(%params);
return $self;
}
sub send_text {
my($self, $text) = @_;
$self->send_htv2_command( HTV2_CMD_PRINT, $text );
}
sub send_command {
my($self, $command) = @_;
$self->send_htv2_command( HTV2_CMD_HD44780_CMD, $command );
}
sub send_htv2_command {
my($self, $command, @params ) = @_;
if( $self->backend eq 'serialrx') {
my $buffer = chr($command);
if( $command == HTV2_CMD_PRINT ) {
# one param - a text string
$buffer .= $params[0];
} else {
# all other cases - params are ASCII char codes
for my $p ( @params ) {
$buffer .= chr($p);
}
}
return $self->device->write( $buffer . HTV2_END_SERIALRX_COMMAND );
} else {
my @i2cvals = ( $command );
if( $command == HTV2_CMD_PRINT ) {
# one param - a text string
my @strvals = split(//, $params[0]);
for my $p ( @strvals ) {
push @i2cvals, ord($p);
}
} else {
# all other cases - params are ASCII char codes
push(@i2cvals, @params) if @params;
}
return $self->device->bus_write( @i2cvals );
}
}
sub backlight {
my($self, $brightness) = @_;
$brightness = 0 if $brightness < 0;
$brightness = 100 if $brightness > 100;
# $brightness = 0 to 100
# we translate to 0 - 250
return unless $self->backlightcontrol;
my $bset;
if($brightness < 0) {
$bset = 0;
} elsif( $brightness >= 250 ) {
$bset = 250;
} else {
$bset = int( 2.5 * $brightness);
}
$self->send_htv2_command( HTV2_CMD_BACKLIGHT, $bset );
}
sub update_baudrate {
my $self = shift;
return unless $self->backend eq 'serialrx';
my $baud = $self->device->baudrate;
my $bflag;
if ($baud == 2400) {
$bflag = HTV2_BAUD_2400;
} elsif ($baud == 4800) {
$bflag = HTV2_BAUD_4800;
} elsif ($baud == 9600) {
$bflag = HTV2_BAUD_9600;
} elsif ($baud == 14400) {
$bflag = HTV2_BAUD_14400;
} elsif ($baud == 19200) {
$bflag = HTV2_BAUD_19200;
} elsif ($baud == 28800) {
$bflag = HTV2_BAUD_28800;
} elsif ($baud == 57600) {
$bflag = HTV2_BAUD_57600;
} elsif ($baud == 115200) {
$bflag = HTV2_BAUD_115200;
} else {
croak(qq(The baudrate of the serial device is not supported by the LCD controller));
}
$self->send_htv2_command( HTV2_CMD_BAUD_RATE, $bflag );
carp('The HobbyTronicsBackpackV2 device must be powered off and on after changing baudrate.');
}
sub update_geometry {
my $self = shift;
$self->send_htv2_command( HTV2_CMD_LCD_TYPE, $self->lines, $self->width );
}
sub change_i2c_address {
my( $self, $newaddress) = @_;
if( $self->backend eq 'serialrx') {
carp('The HobbyTronicsBackpackV2 device is in Serial RX mode. You cannot change the i2c address.');
return;
}
if($newaddress < 1 || $newaddress > 127) {
croak('The i2c address must be in the range 1 - 127 ( 0x01 - 0x7F )');
}
$self->send_htv2_command( HTV2_CMD_I2C_ADDRESS, $newaddress );
carp('The HobbyTronicsBackpackV2 device must be powered off and on after changing i2c address.');
}
1;
__END__
|
