[USB] Replace NUM_INTERFACE define with a NUM_INTERFACE() function #766
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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; }
| ^~~~~
Done to avoid the need for manually keeping NUM_INTERFACE in sync when experimenting with different USB device types with different number of interfaces. The function needs to be constexpr, since it's used to initialize USB configuration descriptors in PROGMEM.
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This PR depends on #767 and #763 to be merged first.
Done to avoid the need for manually keeping
NUM_INTERFACEin sync when experimenting with different USB device types with different number of interfaces. I can submit a PR that does the same also forNUM_ENDPOINTSif there's interest.The function needs to be
constexpr, since it's used to initialize USB configuration descriptors inPROGMEM.