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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, 2014-2021 -- leonerd@leonerd.org.uk |
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package Device::BusPirate::Mode 0.21; |
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use v5.14; |
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use warnings; |
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use Carp; |
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use Future::AsyncAwait; |
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use constant PIRATE_DEBUG => $ENV{PIRATE_DEBUG} // 0; |
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use constant { |
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4478
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CONF_CS => 0x01, |
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CONF_AUX => 0x02, |
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CONF_PULLUP => 0x04, |
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CONF_POWER => 0x08, |
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}; |
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90
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=head1 NAME |
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C - base class for C modes |
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28
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=head1 DESCRIPTION |
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30
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The following methods are implemented by all the various mode subclasses. |
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32
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=cut |
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34
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sub new |
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{ |
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0
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my $class = shift; |
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16
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my ( $bp ) = @_; |
38
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39
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5
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29
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my $self = bless { |
40
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bp => $bp, |
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}, $class; |
42
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43
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5
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31
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$self->{cs} = 0; |
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5
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$self->{power} = 0; |
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5
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14
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$self->{pullup} = 0; |
46
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5
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23
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$self->{aux} = 0; |
47
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48
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5
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22
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return $self; |
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} |
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51
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=head1 METHODS |
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53
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=cut |
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55
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=head2 pirate |
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57
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$pirate = $mode->pirate |
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59
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Returns the underlying L instance. |
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61
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=cut |
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63
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sub pirate |
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{ |
65
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140
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140
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1
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251
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my $self = shift; |
66
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140
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714
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return $self->{bp}; |
67
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} |
68
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69
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async sub _start_mode_and_await |
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4
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9
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{ |
71
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4
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my $self = shift; |
72
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4
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12
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my ( $send, $await ) = @_; |
73
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74
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4
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21
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my $pirate = $self->pirate; |
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76
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4
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31
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$pirate->write( $send ); |
77
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4
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32
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my $buf = await $pirate->read( length $await, "start mode" ); |
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79
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4
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50
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3160
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return $buf if $buf eq $await; |
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0
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0
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die "Expected '$await' response but got '$buf'"; |
81
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} |
82
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83
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=head2 power |
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85
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$mode->power( $power )->get |
86
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87
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Enable or disable the C 5V and 3.3V power outputs. |
88
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89
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=cut |
90
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91
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sub power |
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{ |
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2
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2
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1
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830
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my $self = shift; |
94
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2
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7
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$self->{power} = !!shift; |
95
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2
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7
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$self->_update_peripherals; |
96
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} |
97
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98
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=head2 pullup |
99
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100
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$mode->pullup( $pullup )->get |
101
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102
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Enable or disable the IO pin pullup resistors from C. These are connected |
103
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to the C, C, C and C pins. |
104
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105
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=cut |
106
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107
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sub pullup |
108
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{ |
109
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4
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4
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1
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166
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my $self = shift; |
110
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4
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12
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$self->{pullup} = !!shift; |
111
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4
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19
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$self->_update_peripherals; |
112
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} |
113
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114
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=head2 aux |
115
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116
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$mode->aux( $aux )->get |
117
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118
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Set the C output pin level. |
119
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120
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=cut |
121
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122
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sub aux |
123
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{ |
124
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2
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2
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1
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2415
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my $self = shift; |
125
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2
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7
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$self->{aux} = !!shift; |
126
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2
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13
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$self->_update_peripherals; |
127
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} |
128
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129
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=head2 cs |
130
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131
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$mode->cs( $cs )->get |
132
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133
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Set the C output pin level. |
134
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135
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=cut |
136
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137
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sub cs |
138
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{ |
139
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0
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0
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1
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0
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my $self = shift; |
140
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0
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0
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$self->{cs} = !!shift; |
141
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0
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0
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$self->_update_peripherals; |
142
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} |
143
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144
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sub _update_peripherals |
145
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{ |
146
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8
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8
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19
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my $self = shift; |
147
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148
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$self->pirate->write_expect_ack( chr( 0x40 | |
149
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( $self->{power} ? CONF_POWER : 0 ) | |
150
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( $self->{pullup} ? CONF_PULLUP : 0 ) | |
151
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( $self->{aux} ? CONF_AUX : 0 ) | |
152
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8
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100
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20
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( $self->{cs} ? CONF_CS : 0 ) ), "_update_peripherals" ); |
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100
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100
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100
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153
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} |
154
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155
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=head2 set_pwm |
156
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157
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$mode->set_pwm( freq => $freq, duty => $duty )->get |
158
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159
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Sets the PWM generator to the given frequency and duty cycle, as a percentage. |
160
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If unspecified, duty cycle will be 50%. Set frequency to 0 to disable. |
161
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162
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=cut |
163
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164
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use constant { |
165
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7
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3528
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PRESCALE_1 => 0, |
166
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PRESCALE_8 => 1, |
167
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PRESCALE_64 => 2, |
168
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PRESCALE_256 => 3, |
169
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7
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7
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58
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}; |
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7
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88
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170
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171
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sub set_pwm |
172
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{ |
173
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5
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5
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1
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673
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my $self = shift; |
174
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5
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13
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my %args = @_; |
175
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176
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5
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50
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19
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$self->MODE eq "BB" or |
177
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croak "Cannot ->set_pwm except in BB mode"; |
178
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179
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5
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33
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16
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my $freq = $args{freq} // croak "Require freq"; |
180
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5
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100
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19
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my $duty = $args{duty} // 50; |
181
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182
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5
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100
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14
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if( $freq == 0 ) { |
183
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1
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2
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print STDERR "PIRATE BB CLEAR-PWM\n" if PIRATE_DEBUG; |
184
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1
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4
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return $self->pirate->write_expect_ack( "\x13", "clear PWM" ); |
185
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} |
186
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187
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# in fCPU counts at 16MHz |
188
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4
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8
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my $period = 16E6 / $freq; |
189
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190
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4
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6
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my $prescale = PRESCALE_1; |
191
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4
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100
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10
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$prescale = PRESCALE_8, $period /= 8 if $period >= 2**16; |
192
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4
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100
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10
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$prescale = PRESCALE_64, $period /= 8 if $period >= 2**16; |
193
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4
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50
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8
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$prescale = PRESCALE_256, $period /= 4 if $period >= 2**16; |
194
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4
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50
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9
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croak "PWM frequency too low" if $period >= 2**16; |
195
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196
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4
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8
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$duty = $period * $duty / 100; |
197
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198
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4
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7
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print STDERR "PIRATE BB SET-PWM\n" if PIRATE_DEBUG; |
199
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4
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9
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$self->pirate->write_expect_ack( |
200
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pack( "C C S> S>", 0x12, $prescale, $duty, $period ), "set PWM" |
201
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); |
202
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} |
203
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204
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=head2 read_adc_voltage |
205
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206
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$voltage = $mode->read_adc_voltage->get |
207
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208
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Reads the voltage on the ADC pin and returns it as a numerical value in volts. |
209
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210
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=cut |
211
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212
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async sub read_adc_voltage |
213
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1
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1
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1
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377
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{ |
214
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1
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3
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my $self = shift; |
215
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216
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1
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50
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5
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$self->MODE eq "BB" or |
217
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croak "Cannot ->read_adc except in BB mode"; |
218
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219
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1
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4
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await $self->pirate->write( "\x14" ); |
220
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1
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22
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my $buf = await $self->pirate->read( 2 ); |
221
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222
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1
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226
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return unpack( "S>", $buf ) * 6.6 / 1024; |
223
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} |
224
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225
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=head1 AUTHOR |
226
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227
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Paul Evans |
228
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229
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=cut |
230
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231
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0x55AA; |