Built-in single board and serial-port communication circuit thereof

Abstract

The invention discloses a serial-port communication circuit. The serial-port communication circuit includes a target arm, a debugging arm, a connector and a switch module; the serial-port output end of the target arm is connected to the serial-port input end of the debugging arm and the input end of the connector separately; the serial-port input end of the target arm, the output end of the connector and the serial-port output end of the debugging arm are all connected to the switch module; when the switch module receives a first signal, the serial-port input end of the target arm is in conduction with the output end of the connector, and when the switch module receives a second signal, the serial-port input end of the target arm is in conduction with the serial-port output end of the debugging arm. The serial-port communication circuit overcomes the defect that in a circuit with requirements for serial-port one-to-many communication, a connector can only receive signals of an arm chipand cannot send signals to the arm chip to carry out debugging. The invention further provides a built-in single board. The built-in single board has corresponding technical effects.

Description

technical field [0001] The invention relates to the field of computer embedded technology, in particular to an embedded single board and a serial port communication circuit thereof. Background technique [0002] With the continuous development of computer and storage technology, arm chip as a processor has also been widely used. In the prior art, when debugging an arm chip, a uart (Universal Asynchronous Receiver / Transmitter, Universal Asynchronous Receiver Transmitter) interface is usually used, which may also be called a debugging serial port. [0003] can refer to figure 1 , which is a serial port communication circuit in the prior art. Let’s call the arm chip on the left the first arm101, its serial port output as the first Tx, the serial port input as the first Rx, and the right arm chip as the second arm102, and its serial port output The terminal is called the second Tx, the input terminal of the serial port is called the second Rx, the input terminal of the connec...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a serial port communication circuit, which solves the defect that in a circuit with serial port one-to-many communication requirements, the connector can only receive the signal of the arm chip and cannot send a signal to the arm chip for debugging

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