hey all im trying to get the analog inputs working with C++ for a robot im
building for a school project. i have to use C++ cause its a stipulation
from the teacher. im running the stock angtrom linux kernel and here's what
ive done/tried so far
*echo cape-bone-iio > /sys/devices/bone_capemgr.*/slots *
also ive put this in the etc/properties file so that the file will
automatically be loaded on boot and it seems to be working as i can still
read the 2 different analog file directories through the terminal if i add
this file through the media/BEAGLEBONE/unEc.txt (it might be uNec.txt)file
all of the AIN ports in the helper.17 file disappear. i think it has
something to do with the way the beaglebone loads the file on boot
*cat /sys/bus/iio/devices/iio:device0#/in_voltage5_raw //gives valu
0-4055cat /sys/devices/ocp.2/helper.17/AIN5 //gives value 0-1499*
at the moment im using eclipse running on a ubuntu laptop and ive
implemented some basic c++ programs on the beaglebone black so i know that
the configuration works.
but nomatter what i try i just cant seem to get the code im using to read
the port correctly all i can get out of it how is a bunch of 0's
here's the code
// Name : AINRead.cpp
// Copyright : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================
#include <iostream>
#include <stdio.h>
#include <unistd.h>
using namespace std;
//uncomment which file path you wish to use
// gives value in terminal from 0 - 4055
//char *Remote = "/sys/bus/iio/devices/iio:device0#/in_voltage5_raw";
//gives value in terminal from 0 - 1499
//char *Remote = "/sys/devices/ocp.2/helper.17/AIN5";
FILE * raw_volt;
int iteration = 0;
int main() {
//how its read in terminal
*//cat /sys/bus/iio/devices/iio:device0#/in_voltage5_raw // gives value
0-4055 //cat /sys/devices/ocp.2/helper.17/AIN5 //gives value 0-1499*
while(iteration < 1000) // how many times the loop runs
{
raw_volt = fopen(Remote, "r+"); // reads analog input and stores in
variable raw_volt
// on the off chance that the value stored in raw_volt is already string
printf("raw_volt \n", raw_volt);
char c[10]; //this segment should convert raw_volt to string
sprintf(c,"%d",raw_volt);
printf ("voltage in : %s \n", c);
usleep(1000);
iteration += 1;
}
}
any help in deciphering what im doing wrong would be a big help also let me
know if ive left any pertinent information out
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