STM32F103VBT6自带的RTC测试源代码，可通过串口显示年月日，时分秒，格式为格林尼治时间转化的北京时间-STM32F103VBT6 built-in RTC test source code can be displayed through the serial date, time minutes and seconds, the format for the transformation of Greenwich Mean Time GMT

The program section is divided into three modules: 1. Initialization and task switching. 2. Analog to Digital conversion and storage. 3. Displaying. The first module initialize all the key variables to their defaults and some with values previously s

一个多通道ADC转换DMA传输数据。程序是选择的通道0和通道1，各采集50次，然后滤波取其平均值，并发送到串口显示采样的电压值。-A multi-channel ADC conversion DMA transfer data. Program is selected channels 0 and 1, each collecting 50 times, then filtering the mean value, and sent to the serial display sampled v