esp_metadata_generated

Macro for_each_gpio

Source 
macro_rules! for_each_gpio {
    ($($pattern:tt => $code:tt;)*) => { ... };
}
Available on crate feature _device-selected only.
Expand description

This macro can be used to generate code for each GPIOn instance.

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

This macro has one option for its “Individual matcher” case:

Syntax: ($n:literal, $gpio:ident ($($digital_input_function:ident => $digital_input_signal:ident)*) ($($digital_output_function:ident => $digital_output_signal:ident)*) ($([$pin_attribute:ident])*))

Macro fragments:

  • $n: the number of the GPIO. For GPIO0, $n is 0.
  • $gpio: the name of the GPIO.
  • $digital_input_function: the number of the digital function, as an identifier (i.e. for function 0 this is _0).
  • $digital_input_function: the name of the digital function, as an identifier.
  • $digital_output_function: the number of the digital function, as an identifier (i.e. for function 0 this is _0).
  • $digital_output_function: the name of the digital function, as an identifier.
  • $pin_attribute: Input and/or Output, marks the possible directions of the GPIO. Bracketed so that they can also be matched as optional fragments. Order is always Input first.

Example data: (0, GPIO0 (_5 => EMAC_TX_CLK) (_1 => CLK_OUT1 _5 => EMAC_TX_CLK) ([Input] [Output]))