I have been using Mega2560 until now, but now I changing to Due. Gives error: 't

Projects Programming
1

I also asked this question at the Visualmicro forum!

I have been using Mega2560 until now, but now I changing to Due.
When I compile it complains about this:
Severity Code Description Project File Line
Error 122:18: error: 'time_t' has a previous declaration as 'typedef long int time_t c:\users\matz\appdata\roaming\arduino15\packages\arduino\tools\arm-none-eabi-gcc
\4.8.3-2014q1\arm-none-eabi\include\sys\types.h 122
”

It seems that time_t does not like to be re declared. Anyone know how to fix this?

Regards

2

It doesn't like to be declared because it already is... Depending on what you want (and we don't know) the declaration might already be fine.

3

Anyone know how to fix this?

Of course. Don't re-declare it.

4

Ok, I admit, I gave you to little info.

The Mega2560 was used until now in my project. Today I am start testing Due board instead. I using Visualmicro in VS2015. My hope was/is that the Due using the same libraries as the Mega2560 so the transition to Due will be easy.

I installed the Due and tried to compile. The compiler gave me the error about the re-declaration. I read that this was a known problem, but I did not really find any solution. One solution was to install a new library, but I read that it was different problem with the library, MarkusLange/Arduino-Due-RTC-Library.
Any one tested that library?
Any one knows about any other differences regarding libraries or other problem?
And what can I do to fix the error about the re-declaration, is it to use another RTC library?

Regards

5

My hope was/is that the Due using the same libraries as the Mega2560 so the transition to Due will be easy.

Oh, dear. Starting with an unrealistic expectation is never a good thing.

I installed the Due and tried to compile.

Some code that we still haven't seen.

I read that this was a known problem, but I did not really find any solution.

I've read lots of nonsense on the internet. I've failed to find solutions to problems, too. But, then I don't often post "It doesn't work" type threads without a boatload more information than you've provided so far.

And what can I do to fix the error about the re-declaration, is it to use another RTC library?

I told you. Stop making a duplicate declaration.

If you need help with that, you really must tell us what library is causing you problems. There just is no other way.

6

Haha, I like the comment "unrealistic expectation".

What, have you read nonsense on Internet, were? :wink:

You want some code, here is a small project that worked fine with the Mega2560:

#include <SPI.h>
#include <Dhcp.h>
#include <Dns.h>
#include <Ethernet.h>
#include <EthernetClient.h>
#include <EthernetServer.h>
#include <EthernetUdp.h>
#include <utility\util.h>

// enter desired IP-address and port number below
IPAddress ip(192,168,137,52);
word port = 33000;

#include "U8glib.h" // graphics library for Display
U8GLIB_NHD27OLED_2X_GR u8g(31, 9, 8);

void setup() {
Serial.begin(4800);
Serial.write(highByte(port));
Serial.write(lowByte(port));
for(unsigned int i = 0; i<4 ;i++){
Serial.write(ip*);*

  • }*
    }
    void loop() {
  • draw(); *
    }
    void draw(void){
  • u8g.firstPage();*
  • u8g.setColorIndex(3);*
  • do{*
  • u8g.setFont(u8g_font_8x13B);*
  • u8g.drawStr(3,15,"Set Up complete");*
  • u8g.drawStr(5,30,"IP: "); *
  • u8g.drawStr(7,45, "Port: ");*
  • u8g.setFont(u8g_font_6x12r);*
  • u8g.setPrintPos(30,30);*
  • u8g.print(ip);*
  • u8g.setPrintPos(50,45);*
  • u8g.print(port);*
  • }while( u8g.nextPage() );*
  • delay(200);*
    }
    With the Due it complains about the re-declaration, I don't like that, it is bad!
    I wonder if I missed something obvious or can I expect more of these types of errors when I fix this one???
    The two declarations were at ICMPPing and in
    c:\users\matz\appdata\roaming\arduino15\packages\arduino\tools\arm-none-eabi-gcc\4.8.3-2014q1\arm-none-eabi\include\sys\types.h.
    I renamed the one in ICMPPing from time_t to ltime_t (typedef unsigned long ltime_t;). Now it does not complain about that, now it is new errors.
    Regards
7

I renamed the one in ICMPPing from time_t to ltime_t (typedef unsigned long ltime_t;).

As opposed to just commenting it out?

now it is new errors.

You don't need help with them, I presume, or you would have posted them.

8

You want some code, here is a small project that worked fine with the Mega2560:

// enter desired IP-address and port number below
IPAddress ip(192,168,137,52);
word port = 33000;

#include "U8glib.h" // graphics library for Display
U8GLIB_NHD27OLED_2X_GR u8g(31, 9, 8);

void setup() {

Including the 8) ?