board.h File Reference

Board definitions for the Seeed Studio Xiao ESP32-C3 board. More...

Detailed Description

Board definitions for the Seeed Studio Xiao ESP32-C3 board.

Author

David Picard

Definition in file board.h.

#include <stdint.h>
#include "board_common.h"

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Button pin definitions
#define	BTN0_PIN   GPIO9
	Default button GPIO pin definition. More...
#define	BTN0_MODE   GPIO_IN
	Default button GPIO mode definition. More...
#define	BTN0_INT_FLANK   GPIO_FALLING
	Default interrupt flank definition for the button GPIO.
#define	BUTTON0_PIN   BTN0_PIN
	Definition for compatibility with previous versions.

Macro Definition Documentation

BTN0_MODE

#define BTN0_MODE   GPIO_IN

Default button GPIO mode definition.

The pîn is actually pulled up by an external resistor on the board. As a consequence, the pin mode should be GPIO_IN. The internal pull-up resistor is not enabled on purpose because it would decrease the total pull-up resistor value.

Definition at line 47 of file board.h.

BTN0_PIN

#define BTN0_PIN   GPIO9

Default button GPIO pin definition.

Pressing the button will give a low signal.

Note

GPIO9 is a strapping pin that must be pulled up a boot time in order to boot the user application. After boot, it can be used as user button.

BTN0_PIN conflicts with the SPI MISO line. If the SPI module is enabled, the button will be automatically disabled.

Definition at line 37 of file board.h.