A Decoding and Triggering Method of Asynchronous Serial Bus Signal
An asynchronous serial and bus signal technology, applied in measurement devices, instruments, electrical and digital data processing, etc., can solve problems such as unfavorable signal capture and positioning, and achieve the effect of enhancing analysis and triggering capabilities and improving efficiency.
Inactive Publication Date: 2011-12-28
SOUTHEAST UNIV
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Because in the asynchronous serial bus, the sending data and the receiving data are transmitted in an asynchronous manner, traditional measuring instruments can only trigger and collect asynchronous serial bus signals through simple trigger methods such as edges, which is not conducive to the measured Signal capture and location and subsequent analysis
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[0030] The invention can be used for decoding and triggering of asynchronous serial buses such as RS-232, RS-422 and RS-485.
[0031] The specific implementation method of the present invention will be described below by taking RS-232 as an example in conjunction with the accompanying drawings.
[0032] Assuming that the baud rate of the RS-232 bus set by the user is 9600 bits / second, the number of data bits is 8, the parity check method is even parity, and the stop bit number is 2, the frame format is as follows: figure 1 shown.
[0033] First, according to the baud rate set by the user, the generated sampling clock frequency is 9600×16=153.6kbit / s, which is used as the working clock of the bus data decoding module; then, according to the frame format information set by the user, decode the The data information and additional information are sent to the memory for caching, and finally the cached information is sent to the comparison trigger module for comparison. If the tri...
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The invention provides a decoding and triggering method for asynchronous serial bus signals, which can provide triggering and decoding functions for measuring instruments to collect and analyze asynchronous serial bus signals. First, the sampling clock is generated according to the baud rate set by the user; then, according to the data frame format set by the user, the level event on the serial bus is sampled by the synchronous state machine, and the data information and additional information are analyzed and decoded; finally, the above decoded The information is input to the comparator and compared with the trigger conditions set by the user. If the trigger conditions are met, the trigger signal is output to the outside, and the signal is used to control the acquisition and storage of the measuring instrument. In addition, the above-mentioned decoded information can also be transmitted to subsequent modules of the measuring instrument for further analysis and processing.
Description
technical field [0001] The invention relates to a decoding and triggering method of an asynchronous serial bus signal in a measuring instrument, in particular to a decoding and triggering method of an asynchronous serial bus signal in a digital oscilloscope. Background technique [0002] Asynchronous serial bus is widely used in serial communication between close-range devices, debugging port of embedded system, etc. Because in the asynchronous serial bus, the sending data and the receiving data are transmitted in an asynchronous manner, the traditional measuring instrument can only trigger and collect the asynchronous serial bus signal through a simple trigger method such as an edge, which is not conducive to the measured Signal capture and location and subsequent analysis. Therefore, it is necessary to equip the measuring instrument with a special asynchronous serial bus signal decoding and trigger mode, which is used to analyze and extract the data information and additi...
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Inventor 高礼忠罗伟叶少朋
Owner SOUTHEAST UNIV