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ArduinoJson Serializer

Hi,

I would like to use ArduinoJson to serialize my sensor data before publishing it via mqtt. Unfortunatlex it seems like ArduinoJson and the D21G board package are not compatible?

Is there a way of making them compatible?

Help is highly appreciated!

Error message:

Arduino: 1.8.19 (Windows Store 1.8.57.0) (Windows 10), Board: "Industruino D21G"

In file included from C:\...\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/Numbers/FloatTraits.hpp:13:0, C:\...\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/Numbers/convertNumber.hpp:15,

....

C:\....\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/Polyfills/pgmspace_generic.hpp: In instantiation of 'const T* ArduinoJson::V704PB2::detail::pgm_read(const T* const*) [with T = char]':

C:\....\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/Deserialization/DeserializationError.hpp:85:42:   required from here

C:\....\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/Polyfills/pgmspace_generic.hpp:25:52: error: 'const void*' is not a pointer-to-object type

   return reinterpret_cast<const T*>(pgm_read_ptr(p));                                           ^

exit status 1

Error compiling for board Industruino D21G.

 

Eric Bochert
Eric Bochert
29
| 0 0 0
Asked on 4/29/24, 10:52 AM
1
vote
711 Views

Apperently this is not an Industruino specific error but a SAMD21 specific error. 

The solution is this:

#define ARDUINOJSON_ENABLE_PROGMEM 0
#include <ArduinoJson.h>

Hope this will save somebody else some time saerching.

Eric Bochert
Eric Bochert
29
| 0 0 0
Answered on 4/29/24, 2:18 PM
1
vote

I just ran into this problem also.

This is an error in Arduino.h, propagated from a mistake in an early Arduino.h getting cut-and-pasted into multiple board support packages from various vendors.  Hopefully Industruino will release version 1.0.4 with this bug fix.

<user_directory>\AppData\Local\Arduino15\packages\industruino\hardware\samd\1.0.3\cores\industruino\avr\pgmspace.h

This is the fix, there needs to be another asterix inserted because addr is a pointer to a pointer, not a pointer to a primitive.  

OLD: #define pgm_read_ptr(addr) (*(const void *)(addr))

NEW: #define pgm_read_ptr(addr) (*(const void **)(addr))

Best regards, 

Chris

 

 

Chris_B
Chris_B
14
| 1 1 1
Answered on 3/19/25, 1:46 PM
0
vote

I just ran into this problem also.

This is an error in Arduino.h, propagated from a mistake in an early Arduino.h getting cut-and-pasted into multiple board support packages from various vendors.  Hopefully Industruino will release version 1.0.4 with this bug fix.

<user_directory>\AppData\Local\Arduino15\packages\industruino\hardware\samd\1.0.3\cores\industruino\avr\pgmspace.h

This is the fix, there needs to be another asterix inserted because addr is a pointer to a pointer, not a pointer to a primitive.  

OLD: #define pgm_read_ptr(addr) (*(const void *)(addr))

NEW: #define pgm_read_ptr(addr) (*(const void **)(addr))

Best regards, 

Chris

 

 

Chris_B
Chris_B
14
| 1 1 1
Answered on 3/19/25, 1:46 PM
0
vote

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Asked: 4/29/24, 10:52 AM
Seen: 711 times
Last updated: 3/19/25, 1:46 PM