A serial port wake-up system and serial port communication method without using handshake control lines

Abstract

The invention discloses a serial port awakening system not using a handshake control line and a serial port communication method. The serial port awakening system comprises an awakening processor and an awakened processor, wherein a universal input / output end, a serial port receiving end and a serial port sending end are arranged on the awakening processor; the universal input / output end, the serial port receiving end and the serial port sending end are also arranged on the awakened processor; and the serial port receiving end of the awakened processor is connected with the universal input / output end of the awakened processor. The invention furthermore discloses a method for performing serial port communication by using the serial port awakening system. By use of the system and the method, hardware connection lines can be simplified, so that the mutual coupling property of the system is reduced; and due to use of standard serial port communication, the universality of the system can be improved.

Description

technical field [0001] The invention relates to a serial port wake-up system and a serial port communication method without using a handshake control line. Background technique [0002] In electronic products, serial port communication is the most commonly used communication method between two processors; the sleep mechanism used by the system is the most commonly used means to reduce power consumption. However, under the sleep mechanism, the processor of the system stops running, the system clock stops working, and the code is no longer executed until an interrupt event triggers the processor, the system clock is woken up, and the cpu processes the interrupt event. System block diagram as figure 1 As shown in the figure, Gpio (General Purpose Input Output) means general input / output; Uart (Universal Asynchronous Receiver / Transmitter) means serial port; Uart tx means serial port sending end; Uart rx means serial port receiving end. [0003] Therefore, when the processor is...

AI Technical Summary

Problems solved by technology

But this design has an obvious disadvantage: in addition to the standard serial port lines (tx, rx), an additional handshake control line is required between the processor and the processor, the interoperability and versatility are limited, and the scope of application is small

For example, there is a standard serial port on the PC, but there is no gpio that can be used as a handshake control line, so this solution is basically impossible to use

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