Conflicting Declaration with tNMEA2000_esp32 NMEA2000;

[atestani]

I am porting a Teensy3.2 NMEA2000 application to ESP32. I'm using PlatformIO and an ESP32-WROOM-32E.

platformio.ini is:

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
lib_deps = 
    ttlappalainen/NMEA2000-library@^4.21.5
    ttlappalainen/NMEA2000_esp32@^1.0.3
....

The start of the code looks like this:

// Set up your NMEA2000 CAN pins
#define ESP32_CAN_RX_PIN GPIO_NUM_7
#define ESP32_CAN_TX_PIN GPIO_NUM_4

#include <Arduino.h>
#include <NMEA2000_CAN.h>  // This will automatically include NMEA2000 library
#include <NMEA2000_esp32.h>  
...

// Create NMEA2000 instance
tNMEA2000_esp32 NMEA2000;

The last line is giving a conflicting declaration error. I have searched throughout the code several times and cannot find why this is happening. Also, I have been unable to find a documented example for use of these libraries on an ESP32. Any advice?

Thanks

[atestani]

I found more information from the error in the build output:

In file included from src/main.cpp:39:
.pio/libdeps/esp32dev/NMEA2000-library/src/NMEA2000_CAN.h:278:12: note: previous declaration as 'tNMEA2000& NMEA2000'
 tNMEA2000 &NMEA2000=*(new tNMEA2000_esp32()); 

So I don't need to declare the main object?

[ttlappalainen]

if you use

include // This will automatically include NMEA2000 library

you do not explicitely include specific MCU driver and define NMEA2000 object.

[atestani]

Do I still use #include ?

[ttlappalainen]

No. When you use #include , it includes necessary driver, if it can. If it can not then you do not #include and you have to explicitely include driver and define NMEA2000 object.

[atestani]

Thanks... good to know. Is this documented somewhere? I read everything I could find before posting here.

On Fri, Jun 7, 2024, 12:54 AM Timo Lappalainen @.***> wrote:

No. When you use #include , it includes necessary driver, if it can. If it can not then you do not #include and you have to explicitely include driver and define NMEA2000 object.

— Reply to this email directly, view it on GitHub https://github.com/ttlappalainen/NMEA2000_esp32/issues/26#issuecomment-2153983818, or unsubscribe https://github.com/notifications/unsubscribe-auth/AA2MD75BIJ6AJGXO6C5OUJ3ZGE4IFAVCNFSM6AAAAABI5TT436VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCNJTHE4DGOBRHA . You are receiving this because you authored the thread.Message ID: @.***>

[atestani]

Actually, I found it in the main document under: NMEA2000_CAN.h File Reference

On Fri, Jun 7, 2024 at 11:34 AM Al Testani @.***> wrote:

Thanks... good to know. Is this documented somewhere? I read everything I could find before posting here.

On Fri, Jun 7, 2024, 12:54 AM Timo Lappalainen @.***> wrote:

No. When you use #include , it includes necessary driver, if it can. If it can not then you do not #include and you have to explicitely include driver and define NMEA2000 object.

— Reply to this email directly, view it on GitHub https://github.com/ttlappalainen/NMEA2000_esp32/issues/26#issuecomment-2153983818, or unsubscribe https://github.com/notifications/unsubscribe-auth/AA2MD75BIJ6AJGXO6C5OUJ3ZGE4IFAVCNFSM6AAAAABI5TT436VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCNJTHE4DGOBRHA . You are receiving this because you authored the thread.Message ID: @.***>