periph_conf.h File Reference

Peripheral configurations for the Wemos ESP32-C3 mini board. More...

Detailed Description

Peripheral configurations for the Wemos ESP32-C3 mini board.

For detailed information about the peripheral configuration for ESP32-C3 boards, see section Common Peripherals.

There are two board versions available on the market with a different pinout of the ADC channels and the SPI interface. Which version is used is determined by activating a pseudo module for the corresponding version:

• v1.0.0, module esp32c3_wemos_mini_v1_0_0
• v2.1.0, module esp32c3_wemos_mini_v2_1_0 (default)

To specify which board version is used, simply add the variable definition USEMODULE=... to the make command line, for example:

USEMODULE=esp32c3_wemos_mini_v1_0_0 BOARD=esp32c3-wemos-min make ...

If the board version is not specified, version v2.1.0 is used by default.

Note

Most definitions can be overridden by an application-specific board configuration if necessary.

Author

Gunar Schorcht gunar.nosp@m.@sch.nosp@m.orcht.nosp@m..net

Definition in file periph_conf.h.

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

Include dependency graph for periph_conf.h:

Go to the source code of this file.

ADC and DAC channel configuration
#define	ADC_GPIOS   { GPIO0, GPIO1, GPIO2, GPIO3, GPIO4, GPIO5 }
	Declaration of GPIOs that can be used as ADC channels. More...

I2C configuration
For generic boards, only one I2C interface I2C_DEV(0) is defined. The GPIOs listed in the configuration are only initialized as I2C signals when module periph_i2c is used. Otherwise they are not allocated and can be used for other purposes.
#define	I2C0_SPEED   I2C_SPEED_FAST
	I2C bus speed of I2C_DEV(0)
#define	I2C0_SCL   GPIO10
	SCL signal of I2C_DEV(0)
#define	I2C0_SDA   GPIO8
	SDA signal of I2C_DEV(0)

PWM channel configuration
One PWM device is configured. It uses all GPIOs that are not defined as I2C, SPI or UART for this board. Note As long as the according PWM device is not initialized with the pwm_init, the GPIOs declared for this device can be used for other purposes.
#define	PWM0_GPIOS   { GPIO2, GPIO6, GPIO3 }
	Declaration of the channels for device PWM_DEV(0), at maximum PWM_CHANNEL_NUM_DEV_MAX.

SPI configuration
Note For compatibility with Wemos D1 mini shields, FSPI signals do not use direct I/O (IOMUX pin functions) but are routed through the GPIO matrix as required for D1 mini shields. This limits the SPI clock speed to 26 MHz instead of 80 MHz SPI clock speed. The GPIOs listed in the configuration are not initialized as SPI signals until the corresponding SPI interface is used for the first time by either calling the spi_init_cs function or the spi_acquire function. That is, they are not allocated as SPI signals before and can be used for other purposes as long as the SPI interface is not used.
#define	SPI0_CTRL   FSPI
	FSPI is used as SPI_DEV(0)
#define	SPI0_SCK   GPIO1
	FSPI SCK signal routed to GPIO2 in GPIO matrix.
#define	SPI0_MISO   GPIO0
	FSPI SCK signal routed to GPIO3 in GPIO matrix.
#define	SPI0_MOSI   GPIO4
	FSPI SCK signal routed to GPIO4 in GPIO matrix.
#define	SPI0_CS0   GPIO5
	CS pin controlled in software.

UART configuration
ESP32-C3 provides 2 UART interfaces at maximum: UART_DEV(0) uses fixed standard configuration. UART_DEV(1) is not used.
#define	UART0_TXD   GPIO21
	direct I/O pin for UART_DEV(0) TxD, can't be changed
#define	UART0_RXD   GPIO20
	direct I/O pin for UART_DEV(0) RxD, can't be changed

Macro Definition Documentation

ADC_GPIOS

#define ADC_GPIOS   { GPIO0, GPIO1, GPIO2, GPIO3, GPIO4, GPIO5 }

Declaration of GPIOs that can be used as ADC channels.

For generic boards, all ADC pins that have broken out are declared as ADC channels.

Note

As long as the GPIOs listed in ADC_GPIOS are not initialized as ADC channels with the adc_init function, they can be used for other purposes.

Definition at line 62 of file periph_conf.h.