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  1. Hi, I am planning to build a logic analyser using my Tiva-C launchpad. I have seen a logic analyser using the SUMP protocol but it uses the USB CDC (serail port) to transfer data. http://www.fischl.de...aris_launchpad/ I need a better sampling rate for my GPIO. My plan is to copy the contents of GPIO data register using DMA into the USB FIFO. Then use some custome device driver in USB to transfer data to PC instead of using USB CDC class drivers.There is a similar example for STM32(but for a different application) http://www.st.com/st.../CD00256689.pdf How to find out the sampling rate for a GPIO ? If I use DMA to copy the data from GPIO, will the performance(i.e sampling rate) of the logic analyser increase ? Could anyone let me know how fast DMA can copy data from GPIO and write to USB FIFO ? How fast can USB CDC then transfer data to the PC ? Do I have to implement USB "BULK" mode(or some custom driver) to transfer data? I found that Saleae logic analyser uses this same concept(copy data from GPIO directly to USB) http://www.saleae.com/logic There is a open source driver for this device to understand the implementation http://sigrok.org/wiki/Fx2lafw Is it worth to design a logic analyser using GPIO <-> DMA <-> USB concept if there wont be much improvement in the performance since there already exist one based on the SUMP protocol(the first link that I have shared). Thanks!
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