ADCWiPy 类 – 模数转换
ADCWiPy 类 – 模数转换笔记此类是 WiPy 的非标准 ADC 实现。它可以像 machine.ADC在 WiPy 上一样简单地使用，但在下面的文档中命名，machine.ADCWiPy以将其与更通用的 machine.ADC类区分开来。用法：import machine
adc = machine.ADC() # create an ADC object
apin = adc.channel(pin='GP3') # create an analog pin on GP3
val = apin() # read an analog value
构造函数classmachine.ADCWiPy(id=0, *, bits=12)创建与给定引脚关联的 ADC 对象。这允许您随后读取该引脚上的模拟值。有关更多信息，请查看 引脚排列和备用功能表。警告ADC 引脚输入范围为 0-1.4V（1.8V 是它可以承受的绝对最大值）。当 GP2、GP3、GP4 或 GP5 重新映射到 ADC 模块时，1.8 V 是最大值。如果这些引脚用于数字模式，则允许的最大输入电压为 3.6V。
方法ADCWiPy.channel(id, *, pin)创建一个模拟引脚。如果仅给出通道 ID，则将选择正确的引脚。或者，只能通过引脚并选择正确的通道。例子：# all of these are equivalent and enable ADC channel 1 on GP3
apin = adc.channel(1)
apin = adc.channel(pin='GP3')
apin = adc.channel(id=1, pin='GP3')
ADCWiPy.init()启用 ADC 模块。ADCWiPy.deinit()禁用 ADC 模块。
类 ADCChannel — 从内部或外部源读取模拟值ADC 通道可以连接到 MCU 的内部点或 GPIO 引脚。ADC 通道是使用 ADC.channel 方法创建的。machine.adcchannel()读取通道值的快速方法。adcchannel.value()读取通道值。adcchannel.init()重新初始化（并有效启用）ADC 通道。adcchannel.deinit()禁用 ADC 通道。
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