Triggering method for serial peripheral interface bus signal

Abstract

The invention discloses a triggering method for a serial peripheral interface bus signal, which can accurately and rapidly provide the analysis and triggering functions of the serial peripheral interface bus signal for measuring equipment. The method comprises the following steps: discriminating the level fluctuation of a serial peripheral interface bus by using a synchronous state machine; converting discrimination results into information sent by the bus; inputting the information into a comparator to be triggered and compared; outputting a trigger signal to outside when the information accords with trigger conditions; and independently outputting the information sent by the bus to a subsequent module of the measuring equipment to complete further signal analysis. The analysis and triggering method for the serial peripheral interface bus signal provided by the invention is favorable for improving the capability of acquiring and analyzing the serial peripheral interface bus signal bythe measuring equipment.

Description

technical field [0001] The invention relates to a triggering method of a serial peripheral interface bus signal in a measuring instrument, in particular to a triggering method of a serial peripheral interface bus (hereinafter referred to as SPI serial bus) signal in a digital oscilloscope. Background technique [0002] At present, with the increasingly widespread application of the SPI serial bus, its debugging process becomes more and more complicated, because in the SPI serial bus, all signals (including clock signals, chip select signals, sending and receiving data signals) are in the form of The serial mode is transmitted on the wire, and this serial mode of transmission puts forward higher requirements for the analysis and trigger functions of the measuring instrument. Traditional measuring instruments can only trigger and collect SPI serial bus signals through simple trigger methods such as edges, which is not conducive to the capture, positioning and subsequent analys...

AI Technical Summary

Problems solved by technology

Traditional measuring instruments can only trigger and collect SPI serial bus signals through simple trigger methods such as edges, which is not conducive to the capture, positioning and subsequent analysis of the measured signal

Images