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下午用dsp的gpio 做pwm信号给驱动芯片hpcl-3120,然后导致28335发热 ,gpio的驱动信号呈高电平,也就是io口被拉至高电平,而不是输出想要的脉冲。发现dsp发热后迅速关了电源。再次上电后驱动又回归正常,但是上主电到一定电压时驱动信号又变成高电平,多次实验后万用表测量1.9v的内核电压和地之间已经短路。