Macro for_each_iomux_function 

macro_rules! for_each_iomux_function {
    ($($pattern:tt => $code:tt;)*) => { ... };
}

Available on crate feature _device-selected only.

This macro can be used to generate code for each IOMUX digital function of each GPIO.

IOMUX functions are the alternate digital functions configured via the IO_MUX registers. Use this to implement signal-specific traits for peripherals whose pins must bypass the GPIO matrix (e.g., EMAC, USB).

For an explanation on the general syntax, as well as usage of individual/repeated matchers, refer to the crate-level documentation.

This macro has two options for its “Individual matcher” case:

• all: ($signal:ident, $gpio:ident, $af:ident) - simple case where you only need identifiers, and maybe the alternate function.
• group: (($signal:ident, $group:ident $(, $number:literal)+), $gpio:ident, $af:ident) - expanded signal case, where you need the number(s) of a signal, or the general group to which the signal belongs.

Macro fragments:

• $signal: the name of the signal.
• $group: the name of the signal, with numbers replaced by placeholders.
• $number: the numbers extracted from $signal.
• $gpio: the name of the GPIO.
• $af: the alternate function number, as an identifier (e.g. _5).

Example data:

• (EMAC_RXD0, GPIO25, _5)
• ((EMAC_RXDn, EMAC_RXDn, 0), GPIO25, _5)

The expanded syntax is only available when the signal has at least one numbered component.