Thomas Gonnot

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5 years, 3 months ago.

Correct usage of event_callback_t (attach method is deprecated?)

Hello,

I am implementing a firmware on a STM32F303RE, and I am using the Serial.write method.

Here is a short version what I have:

Short example

#include "mbed.h"

Serial serialPort(USBTX, USBRX, 115200);

event_callback_t serialCallback;

void onSerialTxComplete(int event)
{
   // Do something
}

void receiveBytes()
{
  unsigned char byte = serialPort.getc();
  // Processes the data
}

int main()
{
  unsigned char buffer[64];
  serialCallback.attach(&onSerialTxComplete);
  serialPort.attach(&receiveBytes);
  while(1)
  {
    serialPort.write((const unsigned char *)buffer, 64, serialCallback, SERIAL_EVENT_TX_COMPLETE);
    wait(2);
  }
}

Now, it does compile, but it also tells me that this implementation is deprecated:

Warning: Function "mbed::Callback<R (A0)>::attach(R (*)(A0)) [with R=void, A0=int]" (declared at line 918 of "/extras/mbed/platform/Callback.h") was declared "deprecated" in "main.cpp"

Anyone knows how the callbacks should be implemented now?

Thank you

1 Answer

Martin Kojtal
5 years, 3 months ago.

Hi, if I got the line correct, the warning should also print what you can use instead. In this case, it would be to use assignment:

Callback cb = function;