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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, 2020-2022 -- leonerd@leonerd.org.uk |
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254315
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use v5.26; |
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use Object::Pad 0.73 ':experimental(init_expr)'; |
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11248
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package Device::Chip::AD9833 0.04; |
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class Device::Chip::AD9833 |
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:isa(Device::Chip); |
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use Carp; |
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use Data::Bitfield 0.02 qw( bitfield boolfield ); |
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6634
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use Future::AsyncAwait 0.38; # aync method |
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use constant PROTOCOL => "SPI"; |
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use constant { |
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5493
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REG_CONFIG => 0x0000, |
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REG_FREQ0 => 0x4000, |
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REG_FREQ1 => 0x8000, |
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REG_PHASE0 => 0xC000, |
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REG_PHASE1 => 0xE000, |
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}; |
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=head1 NAME |
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C - chip driver for F |
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=head1 SYNOPSIS |
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use Device::Chip::AD9833; |
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use Future::AsyncAwait; |
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37
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my $chip = Device::Chip::AD9833->new; |
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await $chip->mount( Device::Chip::Adapter::...->new ); |
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40
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await $chip->init; |
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42
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my $freq = 440; # in Hz |
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await $chip->write_FREQ0( ( $freq << 28 ) / 25E6 ); # presuming 25MHz reference |
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45
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=head1 DESCRIPTION |
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47
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This L subclass provides specific communication to an |
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F F attached to a computer via an SPI adapter. |
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50
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The reader is presumed to be familiar with the general operation of this chip; |
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the documentation here will not attempt to explain or define chip-specific |
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concepts or features, only the use of this module to access them. |
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54
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=cut |
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56
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sub SPI_options |
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{ |
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2
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2
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0
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793
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return ( mode => 2 ); |
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} |
60
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61
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field $_config = 0; |
62
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63
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7
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12
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async method _write ( $word ) |
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15
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64
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{ |
65
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19
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await $self->protocol->write( pack "S>", $word ) |
66
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376
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} |
67
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68
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=head1 METHODS |
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70
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The following methods documented in an C expression return L |
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instances. |
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73
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=cut |
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75
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=head2 init |
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77
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await $chip->init; |
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79
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Resets the chip to a working configuration, including setting the C bit |
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appropriately for the way this module writes the frequency registers. |
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82
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This method must be called before setting the frequency using L |
83
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or L. |
84
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85
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=cut |
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87
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1
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2
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async method init () |
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1
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1
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{ |
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1
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5
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await $self->_write( REG_CONFIG | 0x2100 ); # RESET, B28=1 |
90
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1
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9580
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await $self->_write( REG_CONFIG | 0x2000 ); # unreset, B28=1 |
91
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1
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1
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358
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} |
92
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93
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bitfield { format => "integer" }, CONFIG => |
94
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B28 => boolfield( 13 ), |
95
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HLB => boolfield( 12 ), |
96
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FSELECT => boolfield( 11 ), |
97
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PSELECT => boolfield( 10 ), |
98
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SLEEP1 => boolfield( 7 ), |
99
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SLEEP12 => boolfield( 6 ), |
100
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OPBITEN => boolfield( 5 ), |
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DIV2 => boolfield( 3 ), |
102
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MODE => boolfield( 1 ); |
103
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104
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=head2 read_config |
105
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106
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$config = await $chip->read_config; |
107
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108
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Returns a C reference containing the current chip configuration. Note |
109
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that since the chip does not support querying the configuration, this is just |
110
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an in-memory copy maintained by the object instance, updated by calls to |
111
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L. |
112
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113
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The hash will contain the following named fields, all booleans. |
114
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115
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B28 |
116
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HLB |
117
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FSELECT |
118
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PSELECT |
119
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SLEEP1 |
120
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SLEEP12 |
121
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OPBITEN |
122
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DIV2 |
123
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MODE |
124
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125
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In addition, a new value C will be created combining the current |
126
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settings of C, C and C to explain the waveform generated |
127
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128
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wave => "sine" | "triangle" | "square" | "square/2" |
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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2
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async method read_config () |
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2
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133
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1
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6
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{ |
134
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1
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6
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my %config = unpack_CONFIG( $_config ); |
135
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136
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1
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146
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my $wave; |
137
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1
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50
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5
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if( $config{OPBITEN} ) { |
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50
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138
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0
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0
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0
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$wave = $config{DIV2} ? "square" : "square/2"; |
139
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} |
140
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elsif( $config{MODE} ) { |
141
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0
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0
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$wave = "triangle"; |
142
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} |
143
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else { |
144
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1
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2
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$wave = "sine"; |
145
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} |
146
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1
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2
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$config{wave} = $wave; |
147
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148
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1
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14
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return \%config; |
149
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1
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1
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1
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236
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} |
150
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151
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=head2 change_config |
152
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153
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await $chip->change_config( %changes ); |
154
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155
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Writes updates to the chip configuration. Takes named arguments of the same |
156
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form as returned by L, including the synthesized C |
157
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setting. |
158
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159
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=cut |
160
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161
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2
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3
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async method change_config ( %changes ) |
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2
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5
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2
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2
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162
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2
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7
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{ |
163
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2
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100
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7
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if( defined( my $wave = delete $changes{wave} ) ) {{ |
164
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1
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50
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2
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$changes{OPBITEN} = 1, $changes{MODE} = 0, $changes{DIV2} = 1, last if $wave eq "square"; |
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4
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165
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0
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0
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0
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$changes{OPBITEN} = 1, $changes{MODE} = 0, $changes{DIV2} = 0, last if $wave eq "square/2"; |
166
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0
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0
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0
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$changes{OPBITEN} = 0, $changes{MODE} = 1, last if $wave eq "triangle"; |
167
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0
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0
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0
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$changes{OPBITEN} = 0, $changes{MODE} = 0, last if $wave eq "sine"; |
168
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0
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0
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croak "Unrecognised value for 'wave' configuration - $wave"; |
169
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}} |
170
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171
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2
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17
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my %config = ( unpack_CONFIG( $_config ), %changes ); |
172
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173
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2
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211
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$config{B28} = 1; |
174
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175
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2
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9
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await $self->_write( REG_CONFIG | ( $_config = pack_CONFIG( %config ) ) ); |
176
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2
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2
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1
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15035
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} |
177
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178
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=head2 write_FREQ0 |
179
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180
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=head2 write_FREQ1 |
181
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182
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await $chip->write_FREQ0( $freq ); |
183
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await $chip->write_FREQ1( $freq ); |
184
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185
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Writes the C or C frequency control register. C<$freq> should |
186
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be a 28bit integer value. |
187
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188
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=cut |
189
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190
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1
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2
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async method write_FREQ0 ( $freq ) |
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1
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2
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1
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2
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191
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1
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4
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{ |
192
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1
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4
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await $self->_write( REG_FREQ0 | ( $freq & 0x3FFF ) ); |
193
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1
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1368
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await $self->_write( REG_FREQ0 | ( $freq >> 14 ) ); |
194
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1
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1
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1
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5004
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} |
195
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196
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0
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0
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async method write_FREQ1 ( $freq ) |
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0
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0
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0
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0
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197
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0
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0
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{ |
198
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0
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0
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await $self->_write( REG_FREQ1 | ( $freq & 0x3FFF ) ); |
199
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0
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0
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await $self->_write( REG_FREQ1 | ( $freq >> 14 ) ); |
200
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0
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0
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1
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0
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} |
201
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202
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=head2 write_PHASE0 |
203
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204
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=head2 write_PHASE1 |
205
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206
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await $chip->write_PHASE0( $phase ); |
207
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await $chip->write_PHASE1( $phase ); |
208
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209
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Writes the C or C phase control register. C<$phase> should |
210
|
|
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|
|
be a 12bit integer value. |
211
|
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212
|
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=cut |
213
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|
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|
214
|
1
|
|
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|
3
|
async method write_PHASE0 ( $phase ) |
|
1
|
|
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|
2
|
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1
|
|
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2
|
|
215
|
1
|
|
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|
3
|
{ |
216
|
1
|
|
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|
|
4
|
await $self->_write( REG_PHASE0 | $phase ); |
217
|
1
|
|
|
1
|
1
|
4072
|
} |
218
|
|
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|
|
|
|
|
219
|
0
|
|
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|
|
async method write_PHASE1 ( $phase ) |
|
0
|
|
|
|
|
|
|
|
0
|
|
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|
|
|
220
|
0
|
|
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|
|
|
{ |
221
|
0
|
|
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|
|
|
await $self->_write( REG_PHASE1 | $phase ); |
222
|
0
|
|
|
0
|
1
|
|
} |
223
|
|
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|
|
|
224
|
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|
=head1 AUTHOR |
225
|
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|
226
|
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|
Paul Evans |
227
|
|
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|
228
|
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=cut |
229
|
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230
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0x55AA; |