help me plz /Can't use u16,u8

[SF433]

https://github.com/j2devtribe/arduinolib-modbusrtu-slave/tree/master/ModbusRTUSlave

I'm trying to use this library, but there's an error saying that u16 and u8 are not declared, so how do I solve it?

I used a translator because I am a non-English speaker.

[earlephilhower]

Just add

typedef uint16_t u16
typedef uint8_t u8

after the

#include <Arduino.,h>

line to define them.

Whether this will allow the library to actually work, I have no idea. The fact they use those variables makes me think that this library is for an old 8-bit AVR and may include hardware-specific code.

Good luck!

[SF433]

Thank you for your help

first I only add your add code in Arduino.h

It is nice work.

but I can't explain the code to people who don't know to add code.

so, I added your code in Modbus_rtu.h.

It was fine in Pico, but an error occurred in Arduino Mega.

Through that error, I learned the different code.

In Arduino Mega
#include <Arduino.h> 234line -> #include "USBAPI.h" 29line to 31line ->

typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned long u32;

The above code was added to Modbus_rtu.h and worked well with Mega and Pico.

Thank you