It was steel drivers comment, that solved it.
sudo apt-get install libwiringpi-dev
There are some issues with libwiringpi-dev.
You don't want to call wiringPiSetup(); you'll probably get
Oops: Unable to determine board revision from /proc/device-tree/system/linux,revision
or from /proc/cpuinfo
-> No "Hardware" line
-> You'd best google the error to find out why.
which the reason is you're using a non arm based CPU,and the file its looking at isn't formatted the way it expects. fortunately I don't require any of that, I just wanted to use the simple serial port library.
I also had trouble with sending data via serialPuts(), but I don't need to do the handshaking.. I guess.
This is a little project that reads an Arduino uno with 2 potentiometers and a button, the goal is to use the pots to draw pictures on a screen, or in an image...
#include <iostream>
#include <stdio.h>
#include <unistd.h> //read function
#include <string.h>
#include <wiringSerial.h> //simple serial port library
using namespace std;
//compiled with g++ -Wall -o readSerial readSerial.cpp -lwiringPi
int main(int argc, char ** argv)
{
const char *SensorPort = "/dev/ttyACM0"; //Serial Device Address
int levelSensor = serialOpen(SensorPort, 9600);
//serialPuts(levelSensor, "1"); //Send command to the serial device
while (1){
char buffer[100];
ssize_t length = read(levelSensor, &buffer, sizeof(buffer));
if (length == -1){
cerr << "Error reading from serial port" << endl;
break;
}
else if (length == 0){
cerr << "No more data" << endl;
break;
}else{
buffer[length] = '\0';
cout << buffer; //Read serial data
}
}
return 0;
}
the data being sent via the Arduino is via this code:
/*EtchaSketch
* 2 pots, X,Y, increment
*
* add a button to delete this shtuff
* This program communicates on the serial port, to a separate program that handles the drawing of received coordinates (pot values).
*/
int potX = A0;
int potY = A1;
int sensorValX = 0;
int sensorValY = 0;
int del = 1; //a button on pin 1 for deleting drawn content
int delbutton = 0;
void setup() {
Serial.begin(9600);
pinMode(del, INPUT);
}
void loop() {
// read the value from the pots:
if(digitalRead(del) == HIGH ){
delbutton=1;
}else{
delbutton=0;
}
sensorValX = analogRead(potX);
sensorValY = analogRead(potY);
Serial.print(sensorValX);
Serial.print(",");
Serial.print(sensorValY);
Serial.print(",");
Serial.println(delbutton);
delay(1000);
}
and here it is working good enough to go into the parsing / drawing program
