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ADC采样后graph显示不正常

输入信号为50HZ,750mv——2.75v的正弦波,采样频率为2000HZ

对单个变量进行图形显示,完全乱套

若用数组,由于2000/50=40,即一个周期为40个点,若数组设为50,波形也不正确

只有当数组长度为周期数的整数倍时波形才正确

我是不是哪里设置的有问题?!求大神解答,谢谢!