Unable to use RPC on both cores for variable intechange

Hardware GIGA R1
1

Hi All.

Due to complexity growth of my project I am willing to shift to Arduino GIGA from old style Mega.

Different from the Mega the Giga has a 32-bit dual core CPU (M7 and M4) and I wanted to try the use of variable interchange between the two cores. I think it's pretty "unfair" use the serial port to pass variable values so I have tried to use the RPC calls for variable interchange.

Here is a very simple sketch "the blink" to be loaded to both M7 (main program) and M4.

While M4 is constantly running a simple blink example with "blink" delay as a variable the M7 is listening to the serial port and whenever a new value is detected it updates the blink variable via RPC and so the blink on M4 is updated accordingly.

Pretty straightforward I attach the code:

M7 code:

#include <RPC.h>
 
int blink = 1000; // Default blink delay in milliseconds
 
void setup() {
  Serial.begin(115200); // Initialize Serial communication
  RPC.begin();          // Initialize RPC communication
 
  Serial.println("M7 Core is ready. Send an integer to update blink delay.");
}
 
void loop() {
  if (Serial.available() > 0) {
    int newBlink = Serial.parseInt(); // Read an integer from Serial
    if (newBlink > 0) {
      blink = newBlink;
 
      // Send the updated blink value to the M4 core
      RPC.write("blink", blink);
 
      Serial.print("Updated blink delay: ");
      Serial.println(blink);
    }
  }
}

M4 code:

#include <RPC.h>
 
int blink = 1000; // Default blink delay in milliseconds
const int ledPin = LED_BUILTIN; // Onboard LED pin
 
void setup() {
  pinMode(ledPin, OUTPUT); // Set the LED pin as output
  RPC.begin();             // Initialize RPC communication
 
  // Properly bind the "blink" variable
  RPC.bind("blink", &blink);
}
 
void loop() {
  // Blink the onboard LED with the updated delay
  digitalWrite(ledPin, HIGH);
  delay(blink);
  digitalWrite(ledPin, LOW);
  delay(blink);

}

The M7 compiles correctly.

The M4 does not.

I have tried use different Os (WIndows and MAC) Arduino IDE is updated, all the packages are update, nothing. The compiler throws me this error:

/Users/Steff_Alfr/Library/Arduino15/packages/arduino/hardware/mbed_giga/4.2.1/libraries/rpclib/src/rpc/dispatcher.inl: In instantiation of 'void rpc::detail::dispatcher::bind(const string&, F) [with F = int*; std::__cxx11::string = std::__cxx11::basic_string<char>]':

/Users/Steff_Alfr/Dropbox (Ing.Elettr.)/ENGENHARIA-COMMITMENTS/23.WiseNeuro/ELECTRONIC.ENGINEERING/03.EVCLID/CODING/ARDUINO/DUAL_CORE/Blink_M4/Blink_M4.ino:11:27:  required from here

C:\Users\laspi\AppData\Local\Arduino15\packages\arduino\hardware\mbed_giga\4.2.1\libraries\rpclib\src/rpc/dispatcher.inl:7:58: error: no type named 'result_kind' in 'struct rpc::detail::func_kind_info<volatile int*>'

    bind(name, func, typename detail::func_kind_info<F>::result_kind(),

                                                         ^~~~~~~~~~~~~

C:\Users\laspi\AppData\Local\Arduino15\packages\arduino\hardware\mbed_giga\4.2.1\libraries\rpclib\src/rpc/dispatcher.inl:8:46: error: no type named 'args_kind' in 'struct rpc::detail::func_kind_info<volatile int*>'

         typename detail::func_kind_info<F>::args_kind());


Using library RPC at version 1.0 in folder: /Users/Steff_Alfr/Library/Arduino15/packages/arduino/hardware/mbed_giga/4.2.1/libraries/RPC

Using library rpclib at version 1.0.0 in folder: /Users/Steff_Alfr/Library/Arduino15/packages/arduino/hardware/mbed_giga/4.2.1/libraries/rpclib

Using library openamp at version 1.0 in folder: /Users/Steff_Alfr/Library/Arduino15/packages/arduino/hardware/mbed_giga/4.2.1/libraries/openamp_arduino

                                             ^~~~~~~~~~~

exit status 1

Compilation error: exit status 1

Can Anyone help me going further?

Best regards and thanks

Steve

2

The protocol of your RPC commands don't seem to follow the examples in the guide: Remote Procedure Call (RPC). Scoll down to the PRC section and review. I have used this RPC call protocol similar to what is shown in the RPC Sensor section.

Hope this helps.