Macro gpio_for_signal 

macro_rules! gpio_for_signal {
    (CLK_OUT1 $(, $_fallback:literal)?) => { ... };
    (EMAC_TX_CLK $(, $_fallback:literal)?) => { ... };
    (ADC2_CH1 $(, $_fallback:literal)?) => { ... };
    (TOUCH1 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO11 $(, $_fallback:literal)?) => { ... };
    (SAR_I2C_SDA $(, $_fallback:literal)?) => { ... };
    (U0TXD $(, $_fallback:literal)?) => { ... };
    (CLK_OUT3 $(, $_fallback:literal)?) => { ... };
    (EMAC_RXD2 $(, $_fallback:literal)?) => { ... };
    (HSPIWP $(, $_fallback:literal)?) => { ... };
    (SD2_DATA0 $(, $_fallback:literal)?) => { ... };
    (SD_DATA0 $(, $_fallback:literal)?) => { ... };
    (ADC2_CH2 $(, $_fallback:literal)?) => { ... };
    (TOUCH2 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO12 $(, $_fallback:literal)?) => { ... };
    (SAR_I2C_SCL $(, $_fallback:literal)?) => { ... };
    (U0RXD $(, $_fallback:literal)?) => { ... };
    (CLK_OUT2 $(, $_fallback:literal)?) => { ... };
    (HSPIHD $(, $_fallback:literal)?) => { ... };
    (SD2_DATA1 $(, $_fallback:literal)?) => { ... };
    (SD_DATA1 $(, $_fallback:literal)?) => { ... };
    (EMAC_TXER $(, $_fallback:literal)?) => { ... };
    (ADC2_CH0 $(, $_fallback:literal)?) => { ... };
    (TOUCH0 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO10 $(, $_fallback:literal)?) => { ... };
    (VSPICS0 $(, $_fallback:literal)?) => { ... };
    (SD1_DATA6 $(, $_fallback:literal)?) => { ... };
    (EMAC_RX_CLK $(, $_fallback:literal)?) => { ... };
    (SD_CLK $(, $_fallback:literal)?) => { ... };
    (SPICLK $(, $_fallback:literal)?) => { ... };
    (SD1_CLK $(, $_fallback:literal)?) => { ... };
    (U1CTS $(, $_fallback:literal)?) => { ... };
    (SPIQ $(, $_fallback:literal)?) => { ... };
    (SD1_DATA0 $(, $_fallback:literal)?) => { ... };
    (U2RTS $(, $_fallback:literal)?) => { ... };
    (SPID $(, $_fallback:literal)?) => { ... };
    (SD1_DATA1 $(, $_fallback:literal)?) => { ... };
    (U2CTS $(, $_fallback:literal)?) => { ... };
    (SD_DATA2 $(, $_fallback:literal)?) => { ... };
    (SPIHD $(, $_fallback:literal)?) => { ... };
    (SD1_DATA2 $(, $_fallback:literal)?) => { ... };
    (U1RXD $(, $_fallback:literal)?) => { ... };
    (SD_DATA3 $(, $_fallback:literal)?) => { ... };
    (SPIWP $(, $_fallback:literal)?) => { ... };
    (SD1_DATA3 $(, $_fallback:literal)?) => { ... };
    (U1TXD $(, $_fallback:literal)?) => { ... };
    (SD_CMD $(, $_fallback:literal)?) => { ... };
    (SPICS0 $(, $_fallback:literal)?) => { ... };
    (SD1_CMD $(, $_fallback:literal)?) => { ... };
    (U1RTS $(, $_fallback:literal)?) => { ... };
    (MTDI $(, $_fallback:literal)?) => { ... };
    (HSPIQ $(, $_fallback:literal)?) => { ... };
    (SD2_DATA2 $(, $_fallback:literal)?) => { ... };
    (EMAC_TXD3 $(, $_fallback:literal)?) => { ... };
    (ADC2_CH5 $(, $_fallback:literal)?) => { ... };
    (TOUCH5 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO15 $(, $_fallback:literal)?) => { ... };
    (MTCK $(, $_fallback:literal)?) => { ... };
    (HSPID $(, $_fallback:literal)?) => { ... };
    (SD2_DATA3 $(, $_fallback:literal)?) => { ... };
    (EMAC_RXER $(, $_fallback:literal)?) => { ... };
    (ADC2_CH4 $(, $_fallback:literal)?) => { ... };
    (TOUCH4 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO14 $(, $_fallback:literal)?) => { ... };
    (MTMS $(, $_fallback:literal)?) => { ... };
    (HSPICLK $(, $_fallback:literal)?) => { ... };
    (SD2_CLK $(, $_fallback:literal)?) => { ... };
    (EMAC_TXD2 $(, $_fallback:literal)?) => { ... };
    (ADC2_CH6 $(, $_fallback:literal)?) => { ... };
    (TOUCH6 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO16 $(, $_fallback:literal)?) => { ... };
    (MTDO $(, $_fallback:literal)?) => { ... };
    (HSPICS0 $(, $_fallback:literal)?) => { ... };
    (SD2_CMD $(, $_fallback:literal)?) => { ... };
    (EMAC_RXD3 $(, $_fallback:literal)?) => { ... };
    (ADC2_CH3 $(, $_fallback:literal)?) => { ... };
    (TOUCH3 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO13 $(, $_fallback:literal)?) => { ... };
    (SD1_DATA4 $(, $_fallback:literal)?) => { ... };
    (U2RXD $(, $_fallback:literal)?) => { ... };
    (EMAC_CLK_OUT $(, $_fallback:literal)?) => { ... };
    (SD1_DATA5 $(, $_fallback:literal)?) => { ... };
    (U2TXD $(, $_fallback:literal)?) => { ... };
    (EMAC_CLK_180 $(, $_fallback:literal)?) => { ... };
    (VSPICLK $(, $_fallback:literal)?) => { ... };
    (SD1_DATA7 $(, $_fallback:literal)?) => { ... };
    (VSPIQ $(, $_fallback:literal)?) => { ... };
    (U0CTS $(, $_fallback:literal)?) => { ... };
    (EMAC_TXD0 $(, $_fallback:literal)?) => { ... };
    (VSPIHD $(, $_fallback:literal)?) => { ... };
    (EMAC_TXEN $(, $_fallback:literal)?) => { ... };
    (VSPIWP $(, $_fallback:literal)?) => { ... };
    (U0RTS $(, $_fallback:literal)?) => { ... };
    (EMAC_TXD1 $(, $_fallback:literal)?) => { ... };
    (VSPID $(, $_fallback:literal)?) => { ... };
    (SD1_STROBE $(, $_fallback:literal)?) => { ... };
    (EMAC_RXD0 $(, $_fallback:literal)?) => { ... };
    (DAC1 $(, $_fallback:literal)?) => { ... };
    (ADC2_CH8 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO6 $(, $_fallback:literal)?) => { ... };
    (EMAC_RXD1 $(, $_fallback:literal)?) => { ... };
    (DAC2 $(, $_fallback:literal)?) => { ... };
    (ADC2_CH9 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO7 $(, $_fallback:literal)?) => { ... };
    (EMAC_RXDV $(, $_fallback:literal)?) => { ... };
    (ADC2_CH7 $(, $_fallback:literal)?) => { ... };
    (TOUCH7 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO17 $(, $_fallback:literal)?) => { ... };
    (XTAL_32K_P $(, $_fallback:literal)?) => { ... };
    (ADC1_CH4 $(, $_fallback:literal)?) => { ... };
    (TOUCH9 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO9 $(, $_fallback:literal)?) => { ... };
    (XTAL_32K_N $(, $_fallback:literal)?) => { ... };
    (ADC1_CH5 $(, $_fallback:literal)?) => { ... };
    (TOUCH8 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO8 $(, $_fallback:literal)?) => { ... };
    (ADC1_CH6 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO4 $(, $_fallback:literal)?) => { ... };
    (ADC1_CH7 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO5 $(, $_fallback:literal)?) => { ... };
    (ADC_H $(, $_fallback:literal)?) => { ... };
    (ADC1_CH0 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO0 $(, $_fallback:literal)?) => { ... };
    (ADC1_CH1 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO1 $(, $_fallback:literal)?) => { ... };
    (ADC1_CH2 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO2 $(, $_fallback:literal)?) => { ... };
    (ADC1_CH3 $(, $_fallback:literal)?) => { ... };
    (LP_GPIO3 $(, $_fallback:literal)?) => { ... };
    ($_signal:ident, $fallback:literal) => { ... };
}

Available on crate feature _device-selected only.

Returns the name of the GPIO that provides the given signal, as a string.

The macro takes the name of a direct function - a digital IO MUX function, an analog function, or an LP IO MUX function - and expands to a string literal like "GPIO4". It is meant to keep documentation free of per-chip pin lists.

Signals that are not wired to a pad on this chip have to be routed through the GPIO matrix, which can reach any pad. The macro has no pad to return for those, so it accepts an optional fallback to expand to instead. The fallback is not validated.

If multiple pads provide the signal, the macro returns one that is not reserved for some other purpose, such as booting or interfacing with flash.

Example usage:

• gpio_for_signal!(ADC1_CH0)
• gpio_for_signal!(LP_I2C_SDA, "GPIO6")