Analysis and Research on Reliable Serial Communication Based on Embedded Systems

In embedded systems, serial communication is an indispensable means of communication. The most common method we use is ordinary serial communication, yet it is the least efficient. In this method, after completing the transmission of a frame of data, the peripheral requests an interrupt from the CPU, known as an Interrupt Request (IRQ). Upon receiving the interrupt request, the CPU suspends its current task and executes the Interrupt Service Routine (ISR) associated with the interrupt. For embedded systems, CPU resource allocation is crucial. It is essential to utilize CPU resources efficiently to improve CPU efficiency. Therefore, this article will employ a DMA (Direct Memory Access) + IDLE interrupt method for receiving data and analyze and compare it with ordinary serial communication and DMA serial communication methods.