IRQ for cpp is not working

[inafucoAugusto]

We tried to reproduce the IRQ D0 example from the project shown bellow (path: openwch/ch32v003/EVT/EXAM/EXTI/EXTI0).

If we use the main file as a .C file the issue is not reproducible. However if we change the file to a .CPP (executing all steps to converting the project from .C to .CPP) we are not able to use the IRQ.

Using the debug tool we reached the following result:

Right after pressing the D0 button, we expect the IRQ defined in the .CPP file (this IRQ is the same from exaple EXTI0), but it got stuck at the "EXTI7_0_IRQHandler: 1: j 1b".

[maxgerhardt]

However if we change the file to a .CPP (executing all steps to converting the project from .C to .CPP) we are not able to use the IRQ.

Bruh.

If you use a .cpp file you will get name mangling, so the symbol emitted by a function like

void IRQHandler() {

}

it will emit a mangled symbol (due to C++ supporting overloaded functions that must be disambiguated somehow).

So you need to add an extern "C" declaration to have C linkage (disabling of name manling)

extern "C" void IRQHandler() {

}

or in your above case where you have the function declaration above the implementation, that line just needs to be prefixed with extern "C" (line 86).

See

• https://en.wikipedia.org/wiki/Name_mangling
• http://socialledge.com/sjsu/index.php/Interview_Preparation_topic:_Name_Mangling