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Usb Digital Oscilloscope Application Development

In the embedded system development process, the serial bus protocol analysis has always been a headache to make the work of engineers. In a case of logic analyzer, engineers need to set up complex trigger conditions to capture the required data, this is something that requires expensive equipment investment will take a lot of time for equipment set; with Oscilloscopes Technology The continuous development of serial bus triggering and analysis capabilities appear in a number of high-end oscilloscopes, and welcomed by the embedded engineer. But different manufacturers oscilloscope serial bus analysis functions and performance are very different.

Serial bus using the oscilloscope to trigger

Use an ordinary oscilloscope only general edge-triggered and trigger pulse, it is difficult to capture the complexity of the serial bus waveform. Use with serial bus triggering oscilloscope can easily capture the need for serial data. Yokogawa Corporation DLM2000 Series supports a variety of commonly used digital oscilloscope serial bus triggering, including CAN/LIN/I2C/SPI/UART, even on the user-defined non-standard serial bus trigger. According to the different structure of each bus, you can set a variety of trigger modes. The more trigger mode, the stronger the ability to capture data.

In embedded systems is often the existence of two or more kinds of serial bus structures, such as Car Electronic The CAN and LIN bus often also be used, often need to analyze whether the two bus communication with the problems. The majority of serial bus triggering with an oscilloscope at the same time can trigger a bus, CAN and LIN bus to achieve the same trigger, the oscilloscope can only use two, while the two oscilloscope synchronization problem difficult to resolve. DLM2000 Series oscilloscope features dual bus trigger, you can easily achieve a combination of any two serial bus trigger.

Use the oscilloscope to decode of serial bus

Trigger the need for serial data, engineers are still faced with the original waveform data, in order to carry out efficient bus analysis, need to decode the waveform. At present, the digital oscilloscope used in the decoding techniques include Software Decoding and hardware decoding. Software decoder is the oscilloscope waveform data by the decoding software to obtain results of operations, while reducing hardware costs, but the speed of CPU demanding computing. In practice, using software decoding decoding time oscilloscope take a few seconds or even ten seconds of time. This decoding speed has lost the meaning of real-time analysis, because most of the data has been lost in waiting for decoding. A small number of high-end oscilloscope hardware decoding technology used to solve this problem, so real-time decoding analysis possible.

Decoding results in the display can also display a list of all of the captured frame decoding is very easy to decode the waveform and the corresponding results of observation.

Decoding to get the correct result, different bus parameters need to be set on the oscilloscope. To CAN bus analysis, for example, need to specify the bus type of CAN, CAN set the corresponding channel signal, by adjusting the trigger level and timeline of the CAN bus trigger, then adjust the bit rate, set the invisible power of equality, if SPI bus, but also To specify the 3-wire or 4-wire, specify the clock signal, chip select signal. This setting process need to be very careful, any one set may not be appropriate, decoding the results are likely to get out. Especially the bit rate settings, even the slightest error, the decoding results obtained may be wrong.

Mixed signal digital oscilloscope in the Universal Serial Bus Development Application

Complex set part of the process of commissioning a waste of time, not fully play the role of scope to improve development efficiency. The DLM2000 oscilloscope serial bus triggering and decoding of the automatic settings, the user need only set up the bus type and source channel, the system can automatically adjust the bit rate, trigger level, invisible power equal other settings, in just two within seconds, can trigger synchronization waveform and decode the results displayed. This feature allows the serial bus settings become complicated very convenient, greatly increased the efficiency of the development engineers.

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