stm32多路ad采集程序使用库函数，利用内部adc和dma实现模数转换，PB0，PB1，PC4作为输入口进行三路ad采集转换-stm32 multiple ad collection programs use library functions, and the use of internal adc dma achieve analog-digital conversion, PB0, PB1, PC4 as an input port for converting three-way ad