UART (universal asynchronous receiver/transmitter) serial port communication method based on GPIO (general purpose input/output) handshake and EDMA (enhanced direct memory access)

The invention discloses a UART (universal asynchronous receiver/transmitter) serial port communication method based on GPIO (general purpose input/output) handshake and EDMA (enhanced direct memory access). According to the method, data migration from transmitting and receiving FIFO of UART to an external data buffer is completed automatically on the basis of an EDMA function, and frequent intervention of CPU (central processing unit) is not needed; a receiving terminal is informed through GPIO handshake signals to receive data packets, and the boundaries of the received data packets can be rapidly distinguished and an address of a next to-be-received data packet can be automatically updated; therefore, the efficiency of communication adopting UART serial ports is greatly improved, frequent interruption to CPU processing is reduced when the UART transmits and receives the data pockets, and the utilization rate of CPU resources can be increased. Meanwhile, according to the scheme, the GPIO signals are utilized to have an appointment with opposite terminal equipment, and convenience produced when the opposite terminal equipment uses the UART for receiving is improved to a certain degree, so that the work efficiency of communication adopting the UART serial ports is improved at the level of the overall system.