Rename USB sources from .c to .cpp to enable C++ features #763
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This was referenced Oct 4, 2024
Move the "core_pins.h" includes in usb.c and usb_seremu.c up to enable building the sources as C++ code. The "core_pins.h" include needs to be placed above the "usb_serial.h" and "usb_seremu.h" includes, since these headers contain C++ code that depends on functions in "core_pins.h".
Fixes the following compiler errors if renaming the sources in question from .c to .cpp:
In file included from teensy4\usb.cpp:5:
teensy4\usb_seremu.h: In member function 'void usb_seremu_class::begin(long int)':
teensy4\usb_seremu.h:68:41: error: 'systick_millis_count' was not declared in this scope
68 | uint32_t millis_begin = systick_millis_count;
| ^~~~~~~~~~~~~~~~~~~~
teensy4\usb_seremu.h:79:25: error: 'yield' was not declared in this scope
79 | yield();
| ^~~~~
teensy4\usb_seremu.h: In member function 'usb_seremu_class::operator bool()':
teensy4\usb_seremu.h:102:27: error: 'yield' was not declared in this scope
102 | operator bool() { yield(); return usb_configuration && usb_seremu_online; }
| ^~~~~
In file included from teensy4\usb_seremu.cpp:32:
teensy4\usb_seremu.h: In member function 'void usb_seremu_class::begin(long int)':
teensy4\usb_seremu.h:68:41: error: 'systick_millis_count' was not declared in this scope
68 | uint32_t millis_begin = systick_millis_count;
| ^~~~~~~~~~~~~~~~~~~~
teensy4\usb_seremu.h:79:25: error: 'yield' was not declared in this scope
79 | yield();
| ^~~~~
teensy4\usb_seremu.h: In member function 'usb_seremu_class::operator bool()':
teensy4\usb_seremu.h:102:27: error: 'yield' was not declared in this scope
102 | operator bool() { yield(); return usb_configuration && usb_seremu_online; }
| ^~~~~
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Follow-up to #767. That renames the USB source file extension from
.cto.cppso that they're compiled as C++ code. Needed to add some extern "C" a few places to resolve linker errors.Motivation
I want to improve compatibility with C++11 (and newer), so that I can use
constexprin USB-related code as proposed in #766.