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# You may distribute under the terms of either the GNU General Public License |
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# or the Artistic License (the same terms as Perl itself) |
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# |
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# (C) Paul Evans, 2015-2023 -- leonerd@leonerd.org.uk |
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1038892
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use v5.26; |
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use warnings; |
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use Object::Pad 0.800; |
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package Device::Chip::BV4243 0.04; |
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class Device::Chip::BV4243 |
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:isa(Device::Chip); |
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use utf8; |
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use Future::AsyncAwait; |
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=encoding UTF-8 |
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=head1 NAME |
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C - chip driver for a F |
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=head1 SYNOPSIS |
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use Device::Chip::BV4243; |
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use Future::AsyncAwait; |
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29
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my $chip = Device::Chip::BV4243->new; |
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await $chip->mount( Device::Chip::Adapter::...->new ); |
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await $chip->lcd_reset; |
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await $chip->lcd_string( "Hello, world!" ); |
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=head1 DESCRIPTION |
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This L subclass provides specific communication to a F |
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F LCD/touchpad display module attached to a computer via an I²C |
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adapter. |
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The reader is presumed to be familiar with the general operation of this |
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module; the documention here will not attempt to explain or define |
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module-specific concpets or features, only the use of this module to access |
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them. |
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=cut |
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48
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use constant PROTOCOL => "I2C"; |
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627
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50
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use constant { |
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16262
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CMD_CLEAR_KEYS => 1, |
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CMD_GET_N_KEYS => 2, # => u8 count |
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CMD_GET_KEY => 3, # => u8 key |
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CMD_FIND_KEY => 4, # u8 key => u8 pos |
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CMD_GET_SCANCODE => 5, # => u8 code |
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CMD_BEEP => 6, # u8 msec |
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CMD_READ_CHAN => 10, # => u16 * 8 |
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CMD_READ_DELTA => 11, # => u16 * 8 |
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CMD_EEPROM_RESET => 20, |
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CMD_SLEEP => 21, |
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62
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CMD_LCD_RESET => 30, |
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CMD_LCD_COMMAND => 31, # u8 cmd |
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CMD_LCD_DATA => 32, # u8 data |
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CMD_LCD_STRING => 33, # strZ string |
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CMD_LCD_SIGNON => 35, |
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CMD_LCD_BACKLIGHT => 36, # u8 * 3 rgb - range 0-10 |
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69
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CMD_SYS_READ_EEPROM => 0x90, # u8 addr => u8 val |
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CMD_SYS_WRITE_EEPROM => 0x91, # u8 addr, u8 val |
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72
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CMD_RESET => 0x95, |
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74
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CMD_VERSION => 0xA0, # => u16 |
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CMD_DEVICE_ID => 0xA1, # => u16 |
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33
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}; |
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async method _command ( $cmd, $data = "", $readlen = 0 ) |
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{ |
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if( $readlen ) { |
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await $self->protocol->write_then_read( pack( "C a*", $cmd, $data ), $readlen ); |
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} |
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else { |
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await $self->protocol->write( pack( "C a*", $cmd, $data ) ); |
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} |
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} |
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=head1 METHODS |
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The following methods documented in an C expression return L |
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instances. |
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93
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=cut |
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95
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4
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8
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async method mount ( $adapter, %params ) |
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{ |
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await $self->SUPER::mount( $adapter, %params ); |
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99
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1576
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await $self->protocol->configure( |
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addr => 0x3C, |
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102
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# Chip seems to misbehave at 100kHz; run it at 50 |
103
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max_bitrate => 50E3, |
104
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); |
105
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106
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4
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549
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return $self; |
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4
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1
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280
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} |
108
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109
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# Command wrappers |
110
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111
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=head2 clear_keys |
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113
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await $chip->clear_keys; |
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115
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Clears the keypad buffer. |
116
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117
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=cut |
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119
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1
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async method clear_keys () |
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120
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3
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{ |
121
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await $self->_command( CMD_CLEAR_KEYS ); |
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1
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1
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112
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} |
123
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124
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=head2 get_keycount |
125
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126
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$count = await $chip->get_keycount; |
127
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128
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Returns the number of keys waiting in the keypad buffer. |
129
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130
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=cut |
131
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132
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1
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1
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async method get_keycount () |
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2
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133
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{ |
134
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1
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4
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return unpack "C", await $self->_command( CMD_GET_N_KEYS, "", 1 ); |
135
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1
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1
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1
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} |
136
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137
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=head2 get_key |
138
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139
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$key = await $chip->get_key; |
140
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141
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Returns the next key from the keypad buffer, or 0 if there are none. |
142
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143
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=cut |
144
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145
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1
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2
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async method get_key () |
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146
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1
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{ |
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1
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3
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return unpack "C", await $self->_command( CMD_GET_KEY, "", 1 ); |
148
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1
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1
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1
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4377
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} |
149
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150
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=head2 find_key |
151
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152
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$pos = await $chip->find_key( $key ); |
153
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154
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Returns the position in the key buffer of the given key, or 0 if is not there. |
155
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156
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=cut |
157
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158
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1
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2
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async method find_key ( $key ) |
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2
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1
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1
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159
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{ |
160
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6
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return unpack "C", await $self->_command( CMD_FIND_KEY, pack( "C", $key ), 1 ); |
161
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1
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1
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1
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4157
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} |
162
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163
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=head2 get_scancode |
164
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165
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$code = await $chip->get_scancode; |
166
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167
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Returns the scan value from the keypad scanning matrix. This will be 0 if no |
168
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key is being touched, or an integer value with at least two bits set if a key |
169
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is being held. |
170
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171
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=cut |
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173
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1
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2
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async method get_scancode () |
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2
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174
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1
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3
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{ |
175
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1
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3
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return unpack "C", await $self->_command( CMD_GET_SCANCODE, "", 1 ); |
176
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1
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1
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1
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4115
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} |
177
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178
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=head2 beep |
179
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180
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await $chip->beep( $msec ); |
181
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182
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Turns on the C output line for the specified number of miliseconds. |
183
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184
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=cut |
185
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186
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1
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2
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async method beep ( $msec ) |
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2
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1
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1
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187
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1
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2
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{ |
188
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1
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7
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await $self->_command( CMD_BEEP, pack( "C", $msec ) ); |
189
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1
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1
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1
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110
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} |
190
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191
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=head2 read_chan |
192
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193
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@channels = await $chip->read_chan; |
194
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195
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Returns the raw touchpad sensor values as 8 16bit integers. |
196
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197
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=cut |
198
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199
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1
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2
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async method read_chan () |
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1
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2
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200
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1
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4
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{ |
201
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1
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3
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return unpack "(S>)8", await $self->_command( CMD_READ_CHAN, "", 16 ); |
202
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1
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1
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1
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4297
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} |
203
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204
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=head2 read_delta |
205
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206
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@deltas = await $chip->read_delta; |
207
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208
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|
|
Returns the touchpad sensor values minus the trigger value. |
209
|
|
|
|
|
|
|
|
210
|
|
|
|
|
|
|
=cut |
211
|
|
|
|
|
|
|
|
212
|
1
|
|
|
|
|
2
|
async method read_delta () |
|
1
|
|
|
|
|
2
|
|
213
|
1
|
|
|
|
|
3
|
{ |
214
|
1
|
|
|
|
|
4
|
return unpack "(S>)8", await $self->_command( CMD_READ_DELTA, "", 16 ); |
215
|
1
|
|
|
1
|
1
|
5419
|
} |
216
|
|
|
|
|
|
|
|
217
|
|
|
|
|
|
|
=head2 sleep |
218
|
|
|
|
|
|
|
|
219
|
|
|
|
|
|
|
await $chip->sleep; |
220
|
|
|
|
|
|
|
|
221
|
|
|
|
|
|
|
Puts the device into sleep mode. It stops scanning the keypad, but will still |
222
|
|
|
|
|
|
|
respond to another command which will wake it up again. |
223
|
|
|
|
|
|
|
|
224
|
|
|
|
|
|
|
=cut |
225
|
|
|
|
|
|
|
|
226
|
1
|
|
|
|
|
2
|
async method sleep () |
|
1
|
|
|
|
|
1
|
|
227
|
1
|
|
|
|
|
4
|
{ |
228
|
1
|
|
|
|
|
3
|
await $self->_command( CMD_SLEEP ); |
229
|
1
|
|
|
1
|
1
|
11662
|
} |
230
|
|
|
|
|
|
|
|
231
|
|
|
|
|
|
|
=head2 lcd_reset |
232
|
|
|
|
|
|
|
|
233
|
|
|
|
|
|
|
await $chip->lcd_reset; |
234
|
|
|
|
|
|
|
|
235
|
|
|
|
|
|
|
Resets the LCD. |
236
|
|
|
|
|
|
|
|
237
|
|
|
|
|
|
|
=cut |
238
|
|
|
|
|
|
|
|
239
|
1
|
|
|
|
|
1
|
async method lcd_reset () |
|
1
|
|
|
|
|
1
|
|
240
|
1
|
|
|
|
|
3
|
{ |
241
|
1
|
|
|
|
|
4
|
await $self->_command( CMD_LCD_RESET ); |
242
|
1
|
|
|
1
|
1
|
109
|
} |
243
|
|
|
|
|
|
|
|
244
|
|
|
|
|
|
|
=head2 lcd_command |
245
|
|
|
|
|
|
|
|
246
|
|
|
|
|
|
|
await $chip->lcd_command( $cmd ); |
247
|
|
|
|
|
|
|
|
248
|
|
|
|
|
|
|
Sends a numeric command to the LCD controller. |
249
|
|
|
|
|
|
|
|
250
|
|
|
|
|
|
|
=cut |
251
|
|
|
|
|
|
|
|
252
|
1
|
|
|
|
|
3
|
async method lcd_command ( $cmd ) |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
1
|
|
253
|
1
|
|
|
|
|
3
|
{ |
254
|
1
|
|
|
|
|
5
|
await $self->_command( CMD_LCD_COMMAND, pack "C", $cmd ); |
255
|
1
|
|
|
1
|
1
|
10991
|
} |
256
|
|
|
|
|
|
|
|
257
|
|
|
|
|
|
|
=head2 lcd_data |
258
|
|
|
|
|
|
|
|
259
|
|
|
|
|
|
|
await $chip->lcd_data( $data ); |
260
|
|
|
|
|
|
|
|
261
|
|
|
|
|
|
|
Sends a byte of numerical data to the LCD controller. |
262
|
|
|
|
|
|
|
|
263
|
|
|
|
|
|
|
=cut |
264
|
|
|
|
|
|
|
|
265
|
1
|
|
|
|
|
2
|
async method lcd_data ( $data ) |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
2
|
|
266
|
1
|
|
|
|
|
3
|
{ |
267
|
1
|
|
|
|
|
5
|
await $self->_command( CMD_LCD_DATA, pack "C", $data ); |
268
|
1
|
|
|
1
|
1
|
3822
|
} |
269
|
|
|
|
|
|
|
|
270
|
|
|
|
|
|
|
=head2 lcd_string |
271
|
|
|
|
|
|
|
|
272
|
|
|
|
|
|
|
await $chip->lcd_string( $str ); |
273
|
|
|
|
|
|
|
|
274
|
|
|
|
|
|
|
Sends a string of data to the LCD controller. This is a more efficient version |
275
|
|
|
|
|
|
|
of sending each byte of the string individually using L. |
276
|
|
|
|
|
|
|
|
277
|
|
|
|
|
|
|
=cut |
278
|
|
|
|
|
|
|
|
279
|
1
|
|
|
|
|
2
|
async method lcd_string ( $str ) |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
1
|
|
280
|
1
|
|
|
|
|
3
|
{ |
281
|
1
|
|
|
|
|
4
|
await $self->_command( CMD_LCD_STRING, $str . "\0" ); |
282
|
1
|
|
|
1
|
1
|
3739
|
} |
283
|
|
|
|
|
|
|
|
284
|
|
|
|
|
|
|
=head2 lcd_signon |
285
|
|
|
|
|
|
|
|
286
|
|
|
|
|
|
|
await $chip->lcd_signon; |
287
|
|
|
|
|
|
|
|
288
|
|
|
|
|
|
|
Displays the signon string stored the in EEPROM. |
289
|
|
|
|
|
|
|
|
290
|
|
|
|
|
|
|
=cut |
291
|
|
|
|
|
|
|
|
292
|
1
|
|
|
|
|
2
|
async method lcd_signon () |
|
1
|
|
|
|
|
2
|
|
293
|
1
|
|
|
|
|
3
|
{ |
294
|
1
|
|
|
|
|
3
|
await $self->_command( CMD_LCD_SIGNON ); |
295
|
1
|
|
|
1
|
1
|
3739
|
} |
296
|
|
|
|
|
|
|
|
297
|
|
|
|
|
|
|
=head2 lcd_backlight |
298
|
|
|
|
|
|
|
|
299
|
|
|
|
|
|
|
await $chip->lcd_backlight( $red, $green, $blue ); |
300
|
|
|
|
|
|
|
|
301
|
|
|
|
|
|
|
Sets the level of each of the three backlight channels. Each must be a numeric |
302
|
|
|
|
|
|
|
value between 0 and 10 (inclusive). For single-backlight displays, use the |
303
|
|
|
|
|
|
|
C<$red> channel. |
304
|
|
|
|
|
|
|
|
305
|
|
|
|
|
|
|
=cut |
306
|
|
|
|
|
|
|
|
307
|
1
|
|
|
|
|
2
|
async method lcd_backlight ( $red, $green, $blue ) |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
1
|
|
|
1
|
|
|
|
|
2
|
|
308
|
1
|
|
|
|
|
5
|
{ |
309
|
|
|
|
|
|
|
# Clamp to 0..10 |
310
|
1
|
|
50
|
|
|
6
|
$_ > 10 and $_ = 10 for $red, $green, $blue; |
311
|
|
|
|
|
|
|
|
312
|
1
|
|
|
|
|
6
|
await $self->_command( CMD_LCD_BACKLIGHT, pack "CCC", $red, $green, $blue ) |
313
|
1
|
|
|
1
|
1
|
3799
|
} |
314
|
|
|
|
|
|
|
|
315
|
|
|
|
|
|
|
=head2 reset |
316
|
|
|
|
|
|
|
|
317
|
|
|
|
|
|
|
$chip->reset |
318
|
|
|
|
|
|
|
|
319
|
|
|
|
|
|
|
Resets the device. |
320
|
|
|
|
|
|
|
|
321
|
|
|
|
|
|
|
=cut |
322
|
|
|
|
|
|
|
|
323
|
1
|
|
|
|
|
2
|
async method reset () |
|
1
|
|
|
|
|
2
|
|
324
|
1
|
|
|
|
|
3
|
{ |
325
|
1
|
|
|
|
|
3
|
await $self->_command( CMD_RESET ); |
326
|
1
|
|
|
1
|
1
|
4437
|
} |
327
|
|
|
|
|
|
|
|
328
|
|
|
|
|
|
|
=head2 device_id |
329
|
|
|
|
|
|
|
|
330
|
|
|
|
|
|
|
$id = await $chip->device_id; |
331
|
|
|
|
|
|
|
|
332
|
|
|
|
|
|
|
Returns the device ID value as a 16 bit integer |
333
|
|
|
|
|
|
|
|
334
|
|
|
|
|
|
|
=cut |
335
|
|
|
|
|
|
|
|
336
|
1
|
|
|
|
|
10
|
async method device_id () |
|
1
|
|
|
|
|
3
|
|
337
|
1
|
|
|
|
|
3
|
{ |
338
|
1
|
|
|
|
|
4
|
return unpack "S>", await $self->_command( CMD_DEVICE_ID, "", 2 ); |
339
|
1
|
|
|
1
|
1
|
130
|
} |
340
|
|
|
|
|
|
|
|
341
|
|
|
|
|
|
|
=head2 version |
342
|
|
|
|
|
|
|
|
343
|
|
|
|
|
|
|
$id = await $chip->version; |
344
|
|
|
|
|
|
|
|
345
|
|
|
|
|
|
|
Returns the device firmware version as a 16 bit integer |
346
|
|
|
|
|
|
|
|
347
|
|
|
|
|
|
|
=cut |
348
|
|
|
|
|
|
|
|
349
|
1
|
|
|
|
|
2
|
async method version () |
|
1
|
|
|
|
|
2
|
|
350
|
1
|
|
|
|
|
4
|
{ |
351
|
1
|
|
|
|
|
4
|
return unpack "S>", await $self->_command( CMD_VERSION, "", 2 ); |
352
|
1
|
|
|
1
|
1
|
12368
|
} |
353
|
|
|
|
|
|
|
|
354
|
|
|
|
|
|
|
=head2 eeprom_reset |
355
|
|
|
|
|
|
|
|
356
|
|
|
|
|
|
|
await $chip->eeprom_reset; |
357
|
|
|
|
|
|
|
|
358
|
|
|
|
|
|
|
Resets the configuration EEPROM back to default values. |
359
|
|
|
|
|
|
|
|
360
|
|
|
|
|
|
|
=cut |
361
|
|
|
|
|
|
|
|
362
|
1
|
|
|
|
|
2
|
async method eeprom_reset () |
|
1
|
|
|
|
|
2
|
|
363
|
1
|
|
|
|
|
4
|
{ |
364
|
1
|
|
|
|
|
2
|
await $self->_command( CMD_EEPROM_RESET ); |
365
|
1
|
|
|
1
|
1
|
4307
|
} |
366
|
|
|
|
|
|
|
|
367
|
|
|
|
|
|
|
=head2 eeprom_read |
368
|
|
|
|
|
|
|
|
369
|
|
|
|
|
|
|
$val = await $chip->eeprom_read( $addr ); |
370
|
|
|
|
|
|
|
|
371
|
|
|
|
|
|
|
Reads a byte from the configuration EEPROM. |
372
|
|
|
|
|
|
|
|
373
|
|
|
|
|
|
|
=cut |
374
|
|
|
|
|
|
|
|
375
|
1
|
|
|
|
|
1
|
async method eeprom_read ( $addr ) |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
2
|
|
376
|
1
|
|
|
|
|
4
|
{ |
377
|
1
|
|
|
|
|
6
|
return unpack "C", await $self->_command( CMD_SYS_READ_EEPROM, pack( "C", $addr ), 1 ); |
378
|
1
|
|
|
1
|
1
|
4389
|
} |
379
|
|
|
|
|
|
|
|
380
|
|
|
|
|
|
|
=head2 eeprom_write |
381
|
|
|
|
|
|
|
|
382
|
|
|
|
|
|
|
await $chip->eeprom_write( $addr, $val ); |
383
|
|
|
|
|
|
|
|
384
|
|
|
|
|
|
|
Writes a byte to the configuration EEPROM. |
385
|
|
|
|
|
|
|
|
386
|
|
|
|
|
|
|
=cut |
387
|
|
|
|
|
|
|
|
388
|
1
|
|
|
|
|
2
|
async method eeprom_write ( $addr, $val ) |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
2
|
|
389
|
1
|
|
|
|
|
4
|
{ |
390
|
1
|
|
|
|
|
6
|
await $self->_command( CMD_SYS_WRITE_EEPROM, pack( "C C", $addr, $val ) ); |
391
|
1
|
|
|
1
|
1
|
4837
|
} |
392
|
|
|
|
|
|
|
|
393
|
|
|
|
|
|
|
=head1 SEE ALSO |
394
|
|
|
|
|
|
|
|
395
|
|
|
|
|
|
|
L |
396
|
|
|
|
|
|
|
|
397
|
|
|
|
|
|
|
=cut |
398
|
|
|
|
|
|
|
|
399
|
|
|
|
|
|
|
=head1 AUTHOR |
400
|
|
|
|
|
|
|
|
401
|
|
|
|
|
|
|
Paul Evans |
402
|
|
|
|
|
|
|
|
403
|
|
|
|
|
|
|
=cut |
404
|
|
|
|
|
|
|
|
405
|
|
|
|
|
|
|
0x55AA; |