ARM Cortex-M3的例程，包块ADC、DAC、USB、UART等，几乎所有的外设-ARM Cortex-M3' s routine, mass ADC, DAC, USB, UART, etc., almost all of the peripherals

实现STM32的BITBANK操作，使GPIOC闪灯。这有点类似单片机对IO口的单独操作-STM32' s BITBANK operation to achieve, so GPIOC flash. This is somewhat similar to the IO port on a separate microcontroller operation