这是一个ARM的实验。主要是使用PWM6输出一个固定占空比的单边沿控制PWM信号，通过滤波电路实现DAC转换。使用ADS1.2开发环境-ARM experiment. PWM6 mainly use a fixed duty cycle output of single-edge PWM control signal, filter circuit DAC conversion. ADS1.2 use development environment
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