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昨天开启adc的时候设置的是外部参考电压，电源给5.6脚一个2.5V的电压，是不是操作错误了？
两个板子烧写的程序和硬件都一样吗？
是的，可是现在不用了，一块板子芯片烧了，一块仿真器烧了，一共就两块，唉，只能不玩了。
