Texas Instruments F28069 Piccolo controlSTICK TMDX28069USB TMDX28069USB 데이터 시트
제품 코드
TMDX28069USB
Piccolo F2806x controlSTICK
Quick Start Guide
www.ti.com/controlsuite
www.ti.com/c2000
3
Using the F28069 GUI and Switching Modes of Operation
The application is a FIR and FFT example that is capable of running in both floating and fixed point mode. By default, the
application will be running in floating point mode but may easily be switched to fixed point mode by clicking the
application will be running in floating point mode but may easily be switched to fixed point mode by clicking the
Fixed
Point
tab.
The components available are similar for both floating and fixed point mode. In each mode, the graph shows three curves:
•
InputSignal – Generated combined signal of three sinusoidal waveforms generated by the Input Frequency sliders
•
FilteredSignal_fpu – FIR filtered signal that eliminates all frequencies above the cutoff frequency. Input to the FFT
•
FreqSpectrum_fpu – FFT result. Shows the signal in the frequency domain. Spikes in the graph indicate the
signal frequencies that make up the input signal.
signal frequencies that make up the input signal.
The knob labeled Frequency Cutoff (KHz) controls the frequency cutoff for
the FIR filter.
There are three input frequency slider controls that will let you adjust
three input frequencies. These three sliders (labeled m1, m2 and m3)
are tied to FreqMult1, FreqMult2 and FreqMult3 in the example
application. The spikes in the frequency spectrum graph should
correspond to the frequencies set by these multipliers provided they
haven’t been filtered by the FIR filter.
Finally, there are two bar graphs that show the FIR and FFT
runtime currently measured in the application. Notice the
difference in these graphs when switching from Floating point to
Fixed point mode.