periph_conf.h File Reference

Peripheral MCU configuration for Heltec WiFi LoRa 32 V2 board. More...

Detailed Description

Peripheral MCU configuration for Heltec WiFi LoRa 32 V2 board.

Heltec WiFi LoRa 32 V2 is an ESP32 development board with 8 MB Flash that uses the EPS32 chip directly. It integrates a SemTech SX1276 or SX1278 for LoRaWAN communication in the 433 MHz or the 868/915 MHz band, respectively. Additionally, it has an OLED display connected via I2C on board.

For detailed information about the configuration of ESP32 boards, see section Common Peripherals.

Note

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

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
	Declaration of GPIOs that can be used as ADC channels. More...
#define	DAC_GPIOS   { }
	Declaration of GPIOs that can be used as DAC channels. More...

I2C configuration
Only I2C interface I2C_DEV(0) is used. Note The GPIOs listed in the configuration are only initialized as I2C signals when module perpih_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   GPIO15
	SCL signal of I2C_DEV(0) [UEXT1].
#define	I2C0_SDA   GPIO4
	SDA signal of I2C_DEV(0) [UEXT1].

PWM channel configuration
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   { GPIO25, GPIO0, GPIO2, GPIO17 }
	PWM channels for device PWM_DEV(0)
#define	PWM1_GPIOS   { GPIO22, GPIO23 }
	PWM_DEV(1) is not used.

SPI configuration
Note The GPIOs listed in the configuration are first initialized as SPI signals when 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   VSPI
	VSPI is used as SPI_DEV(0)
#define	SPI0_SCK   GPIO5
	VSPI SCK.
#define	SPI0_MISO   GPIO19
	VSPI MISO.
#define	SPI0_MOSI   GPIO27
	VSPI MOSI.
#define	SPI0_CS0   GPIO18
	VSPI CS0.

UART configuration
ESP32 provides 3 UART interfaces at maximum: UART_DEV(0) uses fixed standard configuration. UART_DEV(1) is defined here. UART_DEV(2) is not used.
#define	UART0_TXD   GPIO1
	direct I/O pin for UART_DEV(0) TxD, can't be changed
#define	UART0_RXD   GPIO3
	direct I/O pin for UART_DEV(0) RxD, can't be changed
#define	UART1_TXD   GPIO10
	direct I/O pin for UART_DEV(1) TxD
#define	UART1_RXD   GPIO9
	direct I/O pin for UART_DEV(1) RxD

Macro Definition Documentation

ADC_GPIOS

#define ADC_GPIOS

Value:

                      { GPIO36, GPIO39, GPIO37, GPIO38, \
                      GPIO0, GPIO2, GPIO12, GPIO13, GPIO4, GPIO15 }

Declaration of GPIOs that can be used 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 52 of file periph_conf.h.

DAC_GPIOS

#define DAC_GPIOS   { }

Declaration of GPIOs that can be used as DAC channels.

Note

As long as the GPIOs listed in DAC_GPIOS are not initialized as DAC channels with the dac_init function, they can be used for other purposes.

Since all DAC GPIOs are used for board control functions, there are no GPIOs left that can be used as DAC channels.

Definition at line 67 of file periph_conf.h.