Difference between revisions of "Component: Frequency Generator (DSP)"
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==Examples== | ==Examples== | ||
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===Basic Sine Wave Generator=== | ===Basic Sine Wave Generator=== | ||
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{{Fcfile|FreqGen.fcfx|FreqGen}} | {{Fcfile|FreqGen.fcfx|FreqGen}} | ||
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The frequency is controlled by adjusting the potentiometer on the panel. | The frequency is controlled by adjusting the potentiometer on the panel. | ||
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| − | The frequency generator period is controlled using the Period Offset property and/or the SetOffset component macro. The Offset value is the LUT index multiplier so a offset of 3.0 will only read every 3 values of the waveform to provide 1/3 of the period and generate 3 x the frequency. As the waveform period is being reduced there is potential for the signal to start to become less | + | The frequency generator period is controlled using the Period Offset property and/or the SetOffset component macro. The Offset value is the LUT index multiplier so a offset of 3.0 will only read every 3 values of the waveform to provide 1/3 of the period and generate 3 x the frequency. As the waveform period is being reduced there is potential for the signal to start to become less defined and more stepped. |
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Switch-able mode frequency generator example file generating different waveforms depending on the value on pins RB0 and RB1. | Switch-able mode frequency generator example file generating different waveforms depending on the value on pins RB0 and RB1. | ||
0 = Sine, 1 = Square, 2 = Triangle, 3 = SawTooth | 0 = Sine, 1 = Square, 2 = Triangle, 3 = SawTooth | ||
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{{Fcfile|FreqGenMulti.fcfx|FreqGenMulti}} | {{Fcfile|FreqGenMulti.fcfx|FreqGenMulti}} | ||
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The frequency is controlled by adjusting the potentiometer on the panel, the waveform is controlled by adjusting the switches on the panel. | The frequency is controlled by adjusting the potentiometer on the panel, the waveform is controlled by adjusting the switches on the panel. | ||
Latest revision as of 14:57, 21 September 2015
| Author | Matrix Ltd |
| Version | 1.2 (Release) |
| Category | DSP |
Contents
Frequency Generator component
A frequency generator component designed to plug into the DSP system component and allow several discreet waveforms to be generated. Functions available include: Sine, Square, Pulse, Triangle, Sawtooth, Noise, Custom
Examples
Basic Sine Wave Generator
FreqGen
The frequency is controlled by adjusting the potentiometer on the panel.
The frequency generator period is controlled using the Period Offset property and/or the SetOffset component macro. The Offset value is the LUT index multiplier so a offset of 3.0 will only read every 3 values of the waveform to provide 1/3 of the period and generate 3 x the frequency. As the waveform period is being reduced there is potential for the signal to start to become less defined and more stepped.
Multi Wave Signal Generator
Switch-able mode frequency generator example file generating different waveforms depending on the value on pins RB0 and RB1.
0 = Sine, 1 = Square, 2 = Triangle, 3 = SawTooth
FreqGenMulti
The frequency is controlled by adjusting the potentiometer on the panel, the waveform is controlled by adjusting the switches on the panel.
Downloadable macro reference
GenerateTick
Assigns a single value to the specified buffer from the selected waveform data. Each call will read the next value from the waveform and will wrap correctly at the end of the data period.
Parameters
- This macro has no parameters
Return value
- This call does not return a value
Generate
Fills the specified buffer with the selected waveform data. If the buffer is smaller or larger then the waveform data period then the data passed will follow on correctly for subsequest cycles.
Parameters
- This macro has no parameters
Return value
- This call does not return a value
SetOffset
Sets the period offset to a new value to alter the waveform output rate.
Parameters
- FLOAT OffsetRate
- 0.2=F/5 0.5=F/2 1.0=F 1.5=F*1.5 2.0=F*2
Return value
- This call does not return a value
Simulation macro reference
This component does not contain any simulation macros
Property reference
Buffer Manager
This property is of type Fixed list of ints and can be referenced with the variable name buffer_manager.
Selects the DSP buffer manager component
Output
This property is of type Fixed list of ints and can be referenced with the variable name input_a.
Selects the buffer to assign the waveform data to
Type
This property is of type Fixed list of ints and can be referenced with the variable name wave_type.
Waveform type selection
Amplitude
This property is of type Signed integer and can be referenced with the variable name wave_amplitude.
Waveform amplitude or volume
Offset
This property is of type Signed integer and can be referenced with the variable name wave_offset.
Waveform DC offset
Period
This property is of type Signed integer and can be referenced with the variable name wave_period.
Waveform period, the number of samples in the cyclic wave
Phase
This property is of type Fixed list of ints and can be referenced with the variable name wave_phase.
Waveform phase, the point in the wave to start streaming from
Data
This property is of type Line of text and can be referenced with the variable name wave_data.
The raw waveform data
Period Offset
This property is of type Floating point and can be referenced with the variable name PeriodOffset.
The initial amount that the index increments through the LUT data when reading the stored waveform.
0.2 = Frequency / 5
0.5 = Frequency / 2
1.0 = Original Frequency
1.5 = Frequency * 1.5
2.0 = Frequency * 2
Sample Rate (hz)
This property is of type Floating point and can be referenced with the variable name sample_rate.
Allows the sample rate to be entered to allow some basic calculations
Period (s)
This property is of type Floating point and can be referenced with the variable name calc_period.
The length of time in seconds that the wave period will cover at the specified sample rate
Frequency (hz)
This property is of type Floating point and can be referenced with the variable name calc_freq.
The repeat frequency of the wave at the specified sample rate
