PLC 测试代码，芯片STM32，测试内容：RAM定位 GPIO PWM Systick RTC ADC DMA EEPROM(24C16) USART 外部中断 -PLC test code, chip STM32, contents of the tests: RAM location GPIO PWM Systick RTC ADC DMA EEPROM (24C16) USART External Inter

STM32通过USART的DMA空闲中断收发数据(The STM32 interrupts data by sending and receiving interrupts through USART's DMA)

在mdk环境下利用stm32 f407单片机实现串口dma功能(To achieve the MDK5 stm32f407 single-chip serial port dma function)