a simple "printf" function

Hi, Clem:

These types of errors are typically caused by stray unprintable characters in the source; the compiler objects to them as they don't fit the defined syntax.

It might be helpful if you posted the actual source code and corresponding error messages.

HTH,

Hi, Clem:

These types of errors are typically caused by stray unprintable characters in the source; the compiler objects to them as they don't fit the defined syntax.

It might be helpful if you posted the actual source code and corresponding error messages.

HTH,

//Include standard io

#include <stdio.h>

#include <stdlib.h>

//Include ArduPi library

#include "arduPi.h"

//Include the Marth library

#include <math.h>

//Needed for Serial Communication

SerialPi Serial;

//Needed for accessing GPIO (pinMode, digitalWrite, digitalRead,

//I2C funcions)

WirePi Wire;

//Needed for SPI

SPIPi SPI;

//Values need for Steinhart-Hart equation

//and calculating resistance.

#define TENKRESISTOR 10000 //our 10K resistor

#define BETA 4000 // This is the Beta Coefficient of your thermistor

#define THERMISTOR 10000  //The resistance of your thermistor at room temp

#define ROOMTEMP 298.15 // standard room temperature in Kelvin (25 Cesius).

//Number of readings to take

//these will be averaged out to

//get a more accurate reading

//You can increase/decrease this as needed

#define READINGS 7

int main() {

  setup();

  while(1) {

  loop();

  }

  return(0)    ;

}

void setup(void){

  printf(¨Starting up thermometer\n¨);

  Wire.begin();

}

void loop(void) {

  float avResistance;

  float resistance;

  int combinedReadings[READINGS];

  byte val0;

  byte val1;

  //Our temperature variable

  float kelvin;

  float fahrenheit;

  float celcius;

  int channelReading;

  float analogReadingArduino;

  /***********************

  ADC mappings

  Pin Adress

  0 0xDC

  1 0x9C

  2 0xCC

  3 0x8C

  4 0xAC

  5 0xEC

  6 0xBC

  7 0xFC

    ****************/

//0xDC is our analop 0 pin

Wire.beginTransmission(8);

Wire.write(byte(0xDC));

Wire.endTransmission();

/* Grad the two bytes returned from the analog 0 pin, combine them

  and write the value to the combinedReadings array

*/

for(int r=0; r<READINGS; r++) {

  Wire.requestFrom(8,2);

  val0 = Wire.read();

  val1 = Wire.read();

  channelReading = int(val0)*16 + int(val1>>4);

  analogReadingArduino = channelReading * 1023 / 4095;

  combinedReadings[r] = analogReadingArduino;

  delay(100);

}

//Grab the average of our 7 readings

//in order to get a more accurate value avResistance = 0;

for (int r=0; r<READINGS; r++) {

  avResistance += combinedReadings[r];

}

avResistance /= READINGS;

/* We can now calculate the resistance of the readings that have come

* back from analog 0

*/

avResistance = (1023 / avResistance) - 1;

avResistance = TENKRESISTOR /avResistance;

resistance = avResistance / THERMISTOR;

//Calculate the temperature in Kelvin

kelvin = log(resistance);

kelvin /= BETA;

kelvin += 1.0 / ROOMTEMP;

kelvin = 1.0 / kelvin;

//printf(¨Temperature in K ¨);

//printf(¨%f \n¨,kelvin);

//Convert from Kelvin to Celsius

celcius = kelvin -= 273.15;

// printf(¨Temperature in C ¨);

//printf(¨%f \n¨, celsius);

//Convert from Celsius to Fahrenheit

fahrenheit = (celcius * 1.8) + 32;

//printf(¨Temperature in F ¨);

//printf(¨%f \n¨, fahrenheit);

//Three second delay before taking our next reading

delay(3000);

}

Hi, Clem:

On line 58 of your program the "quote" marks are encoded as 0xC2 0xA8 (Octal 302 and 250) rather than as 0x22 (the normal ascii quotation mark) .. actually, all of the quotation marks within the printf statements are that way, but as all of the other printf statements are commented out they're ignored by the compiler Interestingly enough the other quote marks were as expected.

HTH,

Bruce

Right on the spot Bruce.

That happens a lot when you copy and paste from the web and Word Clem.

What text editor are you using ?

I've never seen a developer editor doing that, and on most of them syntax highlighting would be wrong with this code.

Hi Iago,

            I am very new to this platform and I am just following what was written in the book, I typed all of them manually, the book recommended to use Geany but it seems this is the culprit but in its bottom line, the mode = Unix; encoding: UTF-8.  What editor can you suggest please.

Best regards,

Clemzky

Hi Bruce,

              Could you share how you managed to do that for the sake of the rest of newbies that might be reading this, as this will be very helpful.  What editor do you use?

Bruce and Iago, thanks you guys for helping and spending time to answer my questions.

Best regards,

Clemzky

Hi Iago, Bruce and John,

                                      Thank you for leading the way, now I can move on, for now I do not think of any Hex Editor, I just downloaded the Eclipse for windows and from there opened up my source code and bingo!! there are special characters, from there I edited the source accordingly and move it to Pi, compiled and works.  If my memory serves me right, there is Eclipse for Pi but not sure, now searching for it to be loaded in the PI as an editor and compiler. Kudos to all of you guys!!!!

Best regards,

Clemzk

Clem, you can cross compile in your desktop and then load the code on the pi.

As you are using Eclipse, you just need the C plugin.

C plugin (CDT) - Eclipse CDT

The cross compiler - https://github.com/raspberrypi/tools/archive/master.zip.If you have git or load git on the Eclipse - EGit - you can clone the cross compiler from here https://github.com/raspberrypi/tools

And then setup it to use the pi cross compiler on Eclipse  - GuruCoding.com - Raspberry Pi Eclipse Tutorial - Setting Up Cross-Compilation In Eclipse

After that you can compile your code for arm in the workstation, and load it on the Pi.

Hi Iago,

            Thanks again, I will fix that one later, now I just bought another set of Pi and now my objective is to set them head less so that I can use my desktop to access them, followed this RPi VNC Server - eLinux.org but the TightVNC is not working whatever I did, the same website recommended using X11VNC which according to that website is better and more secure and can changed the default port from 5901 but never mentioned how.  Found this Setting-Up Raspberry Pi for Headless Mode with X11VNC | Code Chief's Space and followed now successfully installed X11VNC and now it is working on a default port 5901, searched the internet how to change the default but unsuccessful even though I followed them like putting x11vnc -bg -nevershared -forever -tightfilexfer -usepw rfbport 566 -display

Thanks,

Clemzky

You should open a new thread for this question Clemzky, so people on the list will get a meaningful subject on what is being talked on the thread so people with x11vnc experience can jump in the discussion.

Right now thy are getting a message saying "A simple printf" when we are talking about headless raspberry. Some people that may be interested or experienced on the topic can miss it.

I have checked the command line switches for x11vnc and looks like "rfbport" is the right command line option http://www.karlrunge.com/x11vnc/x11vnc_opts.html

The only thing I don't see right in your x11vnc invocation, is you are not using it as a command line switch with a dash in front of it "-rfbport" .

Try with: " sudo x11vnc -bg -nevershared -forever -tightfilexfer -usepw -rfbport 566 -display  :0".

If it doesn't works try the verbose option "-v" to see if the output tells you something about what's going wrong.

Hi Iago,

            Will do but for now time to rest I burnt my 15 hours in front of the computer, using command line will work but when i put it inside the xsession.rc to load the settings during boot up so that i do not have to do it manually, still it goes to the default port 5901.

Thanks a lot,

Clemzky