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Has anyone written C code for the R-Pi to convert 16 bit serial numbers from the ADC into parallel numbers and save these to the Pi’S memory?

1632 Views - Created 21/07/2018

21/07/2018

Posted by:
WayneA

WayneA Avatar

Does anyone have C code for the R-Pi B+ to convert 16/17 bit ADC serial numerical data into parallel data and store a series of these numbers in the R-Pi’s internal memory. Any code listing or suggestions would be greatly appreciated. Many thanks!

Wayne

21/07/2018

Posted by:
andrew

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Location:
United Kingdom

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Hello Wayne

The usual way to store a series of numbers in C is using an array. You can find a good tutorial on arrays at https://www.tutorialspoint.com/cprogramming/c_arrays.htm

You can use our ADC Pi C library to read the values from the ADC Pi using the read_voltage() function.

The code example below creates an array with a size of 1000, reads the ADC 1000 times and then prints the recorded values back to the console.



#include <stdio.h>
#include <stdint.h>
#include <unistd.h>

#include "ABE_ADCPi.h"

int main(int argc, char **argv){
setvbuf (stdout, NULL, _IONBF, 0); // needed to print to the command line

double values[1000];

// save the values from the ADC into the array
for (int i=0; i < 1000; i++){
values[i] = read_voltage(0x68,1, 16, 1, 1); // ADC on I2C address 0x68, channel = 1, 16 bit, pga = 1, conversion mode = continuous
usleep(200000); // sleep 0.2 seconds
}

// print them back to the console
for (int i=0; i < 1000; i++){
printf("Value %i: %G \n", i, values[i]);
}

return (0);
}


Save the code as "demo-adc-array.c" and you can compile it with the following command:



gcc ABE_ADCPi.c demo-adc-array.c -o demo-adc-array


The ADC Pi library files "ABE_ADCPi.h" and ABE_ADCPi.c" will need to be in the same folder as the demo-adc-array.c file.

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