LabWindows/CVI入门教程的虚拟信号发生器

#include <cvirte.h> #include <userint.h> #include "test.h" #include "analysis.h" #define POINTS 1000 void show_wave(void); static int panelHandle; int main (int argc, char *argv[]) { if (InitCVIRTE (0, argv, 0) == 0) return -1; /* out of memory */ if ((panelHandle = LoadPanel (0, "test.uir", PANEL)) < 0) return -1; DisplayPanel (panelHandle); RunUserInterface (); DiscardPanel (panelHandle); return 0; } int CVICALLBACK MyWindowCallback(int panel, int event, void *callbackData, int eventData1, int eventData2) { switch (event) { case EVENT_CLOSE: QuitUserInterface(0); // 关闭程序 break; // 其他事件处理... } return 0; } int CVICALLBACK WaveFormChooseCB (int panel, int control, int event, void *callbackData, int eventData1, int eventData2) { switch (event) { case EVENT_COMMIT: show_wave(); break; } return 0; } int CVICALLBACK amplitudeChooseCB (int panel, int control, int event, void *callbackData, int eventData1, int eventData2) { switch (event) { case EVENT_COMMIT: break; } return 0; } int CVICALLBACK frequecyChoose (int panel, int control, int event, void *callbackData, int eventData1, int eventData2) { switch (event) { case EVENT_COMMIT: break; } return 0; } void show_wave(void) { int waveForm; double ample; double phase = 0.0, waveData[POINTS], filterData[POINTS], specData[POINTS]; double sampleRate = 10000.0, freq; double cutoff_freq=3000.0; /*设置截止频率*/ GetCtrlVal(panelHandle, PANEL_WAVEFORM, &waveForm); GetCtrlVal(panelHandle, PANEL_AMPLE, &ample); GetCtrlVal(panelHandle, PANEL_FREQ, &freq); switch (waveForm) { case 0: DeleteGraphPlot(panelHandle, PANEL_GRAPH1, -1, VAL_IMMEDIATE_DRAW); break; case 1: SineWave(POINTS, ample, freq/sampleRate, &phase, waveData); //注意这里使用的频率指的是归一化的频率。 break; case 2: TriangleWave(POINTS, ample, freq/sampleRate, &phase, waveData); break; case 3: SawtoothWave(POINTS, ample, freq/sampleRate, &phase, waveData); break; case 4: SquareWave(POINTS, ample, freq/sampleRate, &phase, 50.0, waveData); break; default: break; } if(waveForm) { DeleteGraphPlot(panelHandle, PANEL_GRAPH1, -1, VAL_IMMEDIATE_DRAW); PlotWaveform(panelHandle, PANEL_GRAPH1, waveData, POINTS, VAL_DOUBLE, 1.0, 0.0, 0.0, 1.0/sampleRate, VAL_THIN_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 1, VAL_RED); Bw_LPF(waveData, POINTS, sampleRate, cutoff_freq, 5, filterData);//低通滤波 Copy1D(filterData, POINTS, specData);//复制数据 Spectrum(specData, POINTS);//进行功率谱分析 DeleteGraphPlot(panelHandle, PANEL_GRAPH2, -1, VAL_IMMEDIATE_DRAW); PlotWaveform(panelHandle, PANEL_GRAPH2, specData, POINTS, VAL_DOUBLE, 1.0, 0.0, 0.0, sampleRate/POINTS, VAL_THIN_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 1, VAL_RED);//画出信号的功率谱 } }