基本用法
- import pyb
- adc = pyb.ADC(Pin('Y11')) # create an analog object from a pin
- adc = pyb.ADC(pyb.Pin.board.Y11)
- val = adc.read() # read an analog value
- adc = pyb.ADCAll(resolution) # creale an ADCAll object
- val = adc.read_channel(channel) # read the given channel
- val = adc.read_core_temp() # read MCU temperature
- val = adc.read_core_vbat() # read MCU VBAT
- val = adc.read_core_vref() # read MCU VREF
通过GPIO定义一个ADC
定义ADC的分辨率，可以设置为8/10/12
读取adc的值，返回值与adc分辨率有关，8位最大255，10位最大1023，12位最大4095
- adc.read_channel(channel)
读取指定adc通道的值
读取内部温度传感器
读取vbat电压
vback = adc.read_core_vbat() * 1.21 / adc.read_core_vref()
读取vref电压（1.21V参考）
3V3 = 3.3 * 1.21 / adc.read_core_vref()
- adc.read_timed(buf, timer)
以指定频率读取adc参数到buf
buf，缓冲区
timer，频率（Hz）
使用这个函数会将ADC的结果限制到8位
- adc = pyb.ADC(pyb.Pin.board.X19) # create an ADC on pin X19
- buf = bytearray(100) # create a buffer of 100 bytes
- adc.read_timed(buf, 10) # read analog values into buf at 10Hz
- # this will take 10 seconds to finish
- for val in buf: # loop over all values
- print(val) # print the value out
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