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The `PIO_NUM` macro was defined when `rp2_pio.c` was first conceived. There's now a Pico SDK function for this, `pio_get_index()`, which is already used in some parts of the code. This commit removes `PIO_NUM` in favour of using `pio_get_index()` everywhere. Signed-off-by: Phil Howard <github@gadgetoid.com>