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28335 PWM触发AD采样刚开始的几个值偏小很多



我是用PWM触发的dsp28335ad

当配置好AD 和 PWM后     PWM时钟打开 SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = ON;

几路PWM同时开始计数,转换结果显示 刚开始的几个值偏小很多 为什么 硬件上输入的电平应该是稳定的

我想排除软件的问题。