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编程28335pwm1a口输出5k，占空比75%pwm波，但示波器观察波形杂乱，幅值只有50mv,用万用表测量pwm1a口一直短地,但后续无电路，排除后部电路短路情况，同一程序在pwm6a口输出波形正常。请问是否pwm1a口已损坏？
端口损坏是可能性之一。最好能把外围电路全都断开来测试看一下。
