LimeSDR / LimeSDR mini USB 2.0 backwards compatibility

[yindra]

different version of limesuite install different version of firmware. I found that firmware version 18.06 is not able to communicate over USB 2.0, except to perform self-test.

LimeSDR-USB Transmit with gr-limesdr

Here is the Quick Test result: [image] Here is the RX test signal: [image] Here is the TX carrier signal: [20180620_txCarrierSignal] Here is the TX test signal: [20180620_txTestSignal] I got the same results when I loaded the 18.06 firmware with Modules->Programming (it then downloaded the 18.06 firmware and installed it) with LimeSuiteGUI_20180613_1cb1723.exe

I found that the limesdr_toolbox software can fill the transmit fifo, but the LimeSDR-USB never reads data from the transmit fifo. The limesdr_toolbox software gets stuck once the lime::StreamChannel’s fifo is full.