How to achieve a higher Sample Rate from RedPitayas slow Analog Inputs?

Applications, development tools, FPGA, C, WEB
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timosmd
Posts: 5
Joined: Mon Oct 14, 2019 3:26 pm

How to achieve a higher Sample Rate from RedPitayas slow Analog Inputs?

Post by timosmd » Mon Nov 11, 2019 5:26 pm

Hello RedPitaya-Community,

I am trying to read the analog inputs of my RedPitaya (Stemlab 125-14).

According to the datasheet the slow analog inputs should be capable of around 100kS/s.

The maximum I can achieve with the following C-code is around 10-16kS/s. The code is executed & running directly on the Linux OS of the RedPitaya.

Does anyone have an idea on how to maximize the sample rate? Or any ideas for alternate approaches?

For my project I need around 50kS/s.

Thanks in advance!

Code: Select all

// Test für maximale Sample Rate (minimalstes Programm)
#include <stdio.h> 
#include <stdlib.h> 
#include <time.h>
#include <sys/time.h>						        //Header for timestamp
#include "/RedPitaya/api/include/redpitaya/rp.h"   //Header for RP API

int main() 
{  
	float voltage;				//Measured Voltage
	struct timeval currentTime;  //Timestamp
    
	// Initialization of RP-API
    if (rp_Init() != RP_OK) 
	{
        fprintf(stderr, "Red Pitaya API init failed!\n");
        return EXIT_FAILURE;
    }
	
	int counter = 0;	
	while(counter<=100000)				//counter ist Anzahl der Pakete - spaeter while(1)
	{

				//Get AI-Values	
				rp_AIpinGetValue(1, &voltage);				//Read Voltage of Pin1
				
				// Timestamp in microseconds
				
				gettimeofday(&currentTime, NULL);
				unsigned long long microsecondsSinceEpoch = 
				  (unsigned long long)(currentTime.tv_sec) * (int)1e6 + 
				  (unsigned long long)(currentTime.tv_usec);	
				
				printf("%.4f // %llu \n", voltage, microsecondsSinceEpoch);
				
				counter++;
	} 
return 0; 
}

Ilka31415
Posts: 2
Joined: Sun May 31, 2020 9:21 pm

Re: How to achieve a higher Sample Rate from RedPitayas slow Analog Inputs?

Post by Ilka31415 » Sun May 31, 2020 9:23 pm

I would very much like to know that, too! Unfortunately, I could not find anything in the docs.

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