在拨号界面输入“*#*#3646633#*#*”会出现一个界面，这个界面就是工程模式设置界面。下面对听筒音量进行调整。选择Hardware Testing --> AUDIO，先修改
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ADC-10-1R+
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二、由原理图得到的信息各个按键连接的电阻的阻值不一样。按键按下电路连通。电路连通后,每个按键按下的adc值都不一样,通过这个去判断是哪个按键按下。根据自己开发板测得的数
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