实验说明：

1、配置GPIO的时候，要将PC3设置成模拟量输入，模拟量的大小是0-3.3V之间

可以通过精密可调电阻改变输入电压大小。



** 实验现象：

1、通过JLINK下载后，按下“reset”键，程序开始运行。



2、屏幕打印“FireBull ADC_example”时，开始接收转换结果，以数字量的形式输出。



3、旋转板子上的可调电阻时，可以看都数字量的改变。-Experiment: 1, configurable GPIO when PC3 set to analog input, analog size is between 0-3.3V precision adjustable resistors can change the input voltage magnitude.** Experimental phenomena: 1, through JLINK download, press the " reset"　button, the program starts to run. 2, the screen print " FireBull ADC_example" , has begun to receive the conversion results in the form of digital output. 3, rotating adjustable resistor on the board, you can look at all the digital change.