Hello! Have anyone tried this? I’m trying to do some triggered measurements (like an oscilloscope) with the LimeSDR.
Using the gpio examples in C++ in LimeSuite and wrote an extremely simple code:
Using GPIO0 in input mode:
// Device setting etc..
while(!(gpio_val&1)) { if (LMS_GPIORead(device, &gpio_val, 1)!=0) error(); } std::cout << "Triggered!" << std::endl;}
// Read samples and DSP....
The trigger signal is a square pulse of amplitude 3.3V and has a duration of 10 uS.
The system works…sometimes. I can make some triggered measurements but two or more trigger pulses with a time span < 1s must be sended to the LimeSDR. And I don’t know if this can be improved.
I know the code is very simple and maybe there’s a better aproach to resolve this. But the fact that many pulses must be sended to the GPIO0 port makes me think that there is a hardware issue. Maybe an impedance mismatch between the trigger source and the GPIO impedance? Pulse Duration? Parameters in the FPGA to be controlled?
Thanks in advance.
Lucas.