连续输出固定波形

注解

步骤：
1.创建任务 VkDaqCreateTask
2.创建模拟输出通道 VkDaqCreateAIAccelChan
3.设置采样时钟 VkDaqCfgSampClkTiming
4.开始任务 VkDaqStartTask
5.设置固定波形的任务数据 VkDaqSetTaskData
6.停止任务 VkDaqStopTask
7.清理任务 VkDaqClearTask

连续输出固定波形流程图示例

C语言参考

#include <iostream>
#include <stdio.h>
#include "libvkdaq.h"
 
#define CH_NAME                     "dev1/AOUT1"
#define PI                          3.14159265358979323846
 
#define SAMPLING_FREQUENCY          10000   //1~32768               
#define WAVE_AMPLITUDE              5       //0~9
#define WAVE_FREQUENCY              10
#define WAVE_PHASE                  0       //0~360
#define WAVE_OFFSET                 0
 
#define DAQmxFailed(error)              ((error)<0)
#define VkDaqErrChk(functionCall)       if( DAQmxFailed(error=(functionCall)) ) goto Error; else
 
int main(int argc, char* argv[])
{
    int             i = 0;
    int32_t         error = 0;
    const char* taskHandle = "VkDaqTaskHandledac";
    double* data = new double[SAMPLING_FREQUENCY];
 
    // Sin Wave
    for (i = 0; i < SAMPLING_FREQUENCY; i++)
        data[i] = WAVE_AMPLITUDE * sin((double)i / (SAMPLING_FREQUENCY / WAVE_FREQUENCY + (WAVE_PHASE / 360)) * 2.0 * PI) + WAVE_OFFSET;
 
    // VkDaq Configure Code
    VkDaqErrChk(VkDaqCreateTask(taskHandle));
    VkDaqErrChk(VkDaqCreateAOVoltageChan(taskHandle, CH_NAME, "", -9, 9, VkDaq_Val_Volts, ""));
    VkDaqErrChk(VkDaqCfgSampClkTiming(taskHandle, VkDaq_Val_ClkSrc_OnBoardClk, SAMPLING_FREQUENCY, 0, VkDaq_Val_ContSamps, SAMPLING_FREQUENCY));
    // VkDaq Start Code
    VkDaqErrChk(VkDaqStartTask(taskHandle));
 
    // VkDaq Write Code
    VkDaqErrChk(VkDaqSetTaskData(taskHandle, data, SAMPLING_FREQUENCY, 0, 1, 1));
 
    printf("Generate success\n");
Error:
    if (DAQmxFailed(error))
        printf("VkDaq Error: %s\n", VkDaqGetLastErrorInfo());
    if (taskHandle != 0) {
        VkDaqStopTask(taskHandle);
        VkDaqClearTask(taskHandle);
    }
    delete[] data;
    printf("End of program, press Enter key to quit\n");
    getchar();
    return 0;
}