Method and device for improving data receiving correctness of serial port

Abstract

The invention discloses a method and a device for improving the data receiving correctness of a serial port, and belongs to the field of data transmission. The method comprises the following steps: S101: entering a UART (Universal Asynchronous Receiver and Transmitter) interrupt processing function; S102: reading a UART cache, and saving received data in an internal memory; S103: clearing UART interruption marks; and S104, detecting UART interruption marks, and carrying out S102 when one or more UART interruption marks is / are detected. Compared with the prior art, the method has the advantages that the work load of a microcontroller is reduced; adverse impact on current operation of the microcontroller is avoided; software running speed and efficiency are improved; the correctness of received data is improved; and system power consumption is reduced.

Description

technical field [0001] The invention relates to the field of data transmission, in particular to a method and a device for improving the correctness of serial port data reception. Background technique [0002] Universal Asynchronous Receiver and Transmitter (UART) is a communication interface circuit that uses hardware to realize asynchronous serial communication. UART asynchronous serial communication interface is the most common interface in electronic circuit design, which can be used for data communication with host computer or other external devices. . Due to the generality of UART applications, most microcontrollers are integrated with UART modules. [0003] The UART module receives data in units of bytes. Every time a byte or multiple bytes are received, the UART module will set an interrupt flag. When the microcontroller enables the interrupt enable of the UART module, an interrupt will be triggered. operation, the microcontroller will interrupt the current operati...

AI Technical Summary

Problems solved by technology

[0006] 1. The workload of the microcontroller is heavy; since the microcontroller needs to continuously enter and exit interrupts to complete the receiving work of serial port data, this makes the microcontroller constantly interrupt the current operation, keep the interrupt site, execute the interrupt processing function, Then exit the interrupt and restore the interrupted site, which makes the workload of the microcontroller very large

[0007] 2. It has adverse effects on the current operation of the microcontroller; the microcontroller needs to interrupt the current operation when processing interrupts, and frequent in and out interrupts will affect other operations, and even cause some operations to fail

For example, when a device has very strict requirements on the operation sequence, if the UART interrupt processing is frequently entered and exited during the operation of the device, the operation of the device will fail, and in severe cases, the entire program may collapse.

[0008] 3. The operating speed and operating efficiency of the software are reduced; the microcontroller frequently enters and exits the UART interrupt, which reduces the operating speed and operating efficiency of the software as a whole, because part of the work of the microcontroller is consumed to save the interrupted scene and restore the interrupted scene superior

[0009] 4. It may cause data loss and reduce the correctness of data reception; after entering the UART interrupt processing function, if the function cannot be exited in time, it will cause the newly received data of the UART interface to be read before it has time to be read. Covered by the data, the size of the UART data receiving buffer is certain (generally one or several bytes), when there is already data stored in the buffer, when the next data arrives, the UART module does not care about the current buffer. If there is no data, the new data will be directly put into the UART cache, overwriting the current data, resulting in data loss

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