This allows to set custom descriptive names for virtual MIDI
ports/cables. A MIDI port offers different functionality on
the same physical USB device. The names make it easier to
distinguish one from the other.
IAR generates warning Pa167 'the "fallthrough" attribute is not supported'.
It doesn't generate warnings when one switch case falls through to another,
so simply make TU_ATTR_FALLTHROUGH expand to an empty string.
Also replace one instance of __attribute__ with the macro.
This affects struct rspMsg in usbtmc_app.c (unconditionally) and uint8_t
termChar in usbtmc_device.c (when NDEBUG is defined). IAR generates warning
Pe550 'variable was set but never used'.
IAR generates warning Pe111 'statement is unreachable'. In a couple of
cases, replace return statements with TU_ATTR_FALLTHROUGH; because some
compilers apparently can't figure out that the return statements are
unreachable but do whinge about an imagined fall-through without them!
This is a GCC extension, illegal in ISO C. IAR generates errors Pa152
'these operand types cannot be used here' and Pe852 'expression must be a
pointer to a complete object type'.
Replace with uint8_t*.
ISO packet size is up to 1023 for full speed device.
Upon completion of ISO reception, reported length of incoming packet
was truncated to one byte only.
This results in incorrect data stream for higher bit rates
48 samples * 4 bytes per sample * 2 channels = 384 bytes of data
and 128 was reported.
There is no change in logic extending xact_len to uint16_t fixes the issue.
Some compilers don't support the GNU extension `typeof` so their definitions
of `hw_set_alias` can't inherit their type from their argument, and the best
we can do is have `hw_set_alias` act the same as `hw_set_alias_untyped`.
This requires an explicit cast when the macro is used instead, otherwise
IAR generates error Pe132 'expression must have pointer-to-struct-or-union
type but it has type "void *"'.
The same goes for `hw_clear_alias`.
