P3.6&P3.7
PIN_FUNC &= ~(1<<7); //standard pull-up Port3Cfg(3,7); Port3Cfg(3,6); USB_CTRL=bUC_DEV_PU_EN; //enable enhanced pull-up
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CH32V203: 增强型低功耗RISC-V单片机
P3.6&P3.7
PIN_FUNC &= ~(1<<7); //standard pull-up Port3Cfg(3,7); Port3Cfg(3,6); USB_CTRL=bUC_DEV_PU_EN; //enable enhanced pull-up