Hello everyone,
I'm totally new to FPGAs, and I think that I what I want to do is very simple, but I do not know where to start. Here it is: I would like to output from the DAC the data from the ADC after a possible large time delay (and maybe in the future some simple transformation, scaling, squaring), Essentially, what I want to do is a FIR filter with, e.g., 1e6 coefficients equal to zero and the last one being unity.
This must works without time gap and so I cannot simply "read" and subsequently "write" with either matlab or C API I believe since during this time data could be lost (or is some buffering preventing that possible ?)
I could already implement such an idea efficiently on a STM32 using DMA and reading and writing in a single memory buffer with simply a shift of one cell. Yet, it took me 3 months learning microcontroller programing to write, essentially, 5 lines of codes
My hope would be that I could achieve the same result with the RP using the C API and not having to mess around with the "wiring" of the FPGA, but, I could not find a full documentation of the C API and in particular how to talk to ADC and DAC. Is this documentation available somewhere ? In particular, I think that with one example of FIR filter or a look up table would certainly be a good starting point for me to get started.
thank you very much in advance for your help,
JJ.
feeding DAC output with delayed values of ADC input
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- redpitaya
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Re: feeding DAC output with delayed values of ADC input
Hello Jujava,
Sorry for the late reply.
The samples from the ADC and DAC are stored in the FPGA you can find the addresses here:
https://redpitaya.readthedocs.io/en/lat ... #registers
There is a small part of programming done in FPGA before the C software takes over.
You can also check out FPGA tutorials from Professor Trost from the University of Ljubljana:
(the 1.04 project is meant for 1.04-28 OS image for STEMlab 125-14)
url]https://lniv.fe.uni-lj.si/redpitaya/[/url]
Otherwise, the C functions are here: https://github.com/RedPitaya/RedPitaya ... i/src/rp.c
I hope this helps.
Sorry for the late reply.
The samples from the ADC and DAC are stored in the FPGA you can find the addresses here:
https://redpitaya.readthedocs.io/en/lat ... #registers
There is a small part of programming done in FPGA before the C software takes over.
You can also check out FPGA tutorials from Professor Trost from the University of Ljubljana:
(the 1.04 project is meant for 1.04-28 OS image for STEMlab 125-14)
url]https://lniv.fe.uni-lj.si/redpitaya/[/url]
Otherwise, the C functions are here: https://github.com/RedPitaya/RedPitaya ... i/src/rp.c
I hope this helps.
-
- Posts: 4
- Joined: Thu Aug 03, 2023 11:08 am
Re: feeding DAC output with delayed values of ADC input
Hello
thanks for your answer and yes, it helps !
best regards,
JJ.
thanks for your answer and yes, it helps !
best regards,
JJ.
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