An automatic baud rate detection method and detection module

Abstract

The invention discloses an automatic baud rate detection method, which comprises the steps of continuously counting the baud rate counter from the start moment to the first moment, from the first moment to the second moment, and from the second moment to the third moment, respectively obtaining the first 1. The second and third baud rate values; the baud rate generator of the asynchronous receiver transmitter uses the first, second and third baud rate values ​​as the baud rate to generate the first, second and third baud rates Rate synchronization signal; compare the received data received with the baud rate synchronization signal as the sampling point with the agreed data, if the two are the same, the automatic baud rate detection is completed. The automatic baud rate detection method of the present invention also includes start bit time detection and half bit detection. The invention also discloses an automatic baud rate detection module, which includes an accurate baud rate detection unit, a start bit time detection unit, a half bit detection unit and a data frame matching detection unit. Compared with the prior art, the present invention can provide more accurate and fast automatic baud rate detection.

Description

technical field [0001] The invention relates to the technical field of data communication, in particular to an automatic baud rate detection method and a detection module applied in the field of large-scale serial port data communication in the Beidou navigation system. Background technique [0002] In a Beidou navigation system chip, the Universal Asynchronous Receiver Transmitter (UART) provides an asynchronous communication interface as the main way for the system to exchange data with external host / slave devices. When communicating with the host, it is used as the main interface for program download / update; when communicating with the slave device, it is used to output navigation and positioning information. [0003] The structure of a typical Universal Asynchronous Receiver Transmitter (UART) see figure 1 . For the sending part, the data to be sent t1 (8bit) is transferred from the bus interface circuit 11 to the sending buffer 13; when the sending controller 14 enter...

AI Technical Summary

Problems solved by technology

[0005] Due to the fact that the data may be biased after being converted and quantized during transmission, the length of the high and low levels of each bit of the formed square wave is not equal, so the baud rate calculated according to the low level of the start bit may be too high or biased. Small, the result is that the automatic baud rate detection is unsuccessful or the detection is successful but the obtained baud rate cannot meet the transmission error requirements

Therefore it can be seen that there are some problems in the above-mentioned baud rate detection method of the prior art

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