Save to file

[ayhanyzc]

Hi,
How can I write the streamed samples to a file? As far as I understand the fifo file in the tmp folder is deleted at the end of the execution.

Thank you.

[Habraken]

I use the following command:

timeout 2s cat /tmp/adc.fifo > /tmp/adc.data.csv

With the above command you 'copy' the data from the .fifo to the .csv for two seconds.
you could also use:

cat /tmp/adc.fifo > /tmp/adc.data.csv

if you don't want the timeout.

[Habraken]

What I forgot to mention is that I do this in a separate terminal.

[ayhanyzc]

Thanks a lot.

[ayhanyzc]

Hi again,
I'm trying to read an RF sensor output. Unfortunately the output file contains lots of zeros which I do not expect. I reduced the sampling to localize the problem, but despite low sampling rate I got lots of zeros again. I attached the screen shot. Do you have any idea about it?

[ayhanyzc]

The problem was about the raspberry configuration, I disabled spi interface and the was solved.
Is there a way to the data from two channels of the adc with the code?

Thanks.

[Habraken]

In principle yes, but… have tried to get this DMA method working for more than one channel. I can’t get it to work in a stable manner. It works for a while and some how the data send to the ADC gets out of sync with communication sequence.

[ayhanyzc]

Would you share the multi channel code with me? I need limited duration of data from two channels.

[Habraken]

Okay. After the weekend I will create a two channel example.

[ayhanyzc]

I'm so sorry about disturbing you but I wonder if you had time to create a two channel example.
Best wishes.