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.

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

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 `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 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.

◆ I2C0_SCL

#define I2C0_SCL GPIO15

SCL signal of I2C_DEV(0) [UEXT1].

Definition at line 86 of file periph_conf.h.

◆ I2C0_SDA

#define I2C0_SDA GPIO4

SDA signal of I2C_DEV(0) [UEXT1].

Definition at line 89 of file periph_conf.h.

◆ I2C0_SPEED

#define I2C0_SPEED I2C_SPEED_FAST

I2C bus speed of I2C_DEV(0)

Definition at line 83 of file periph_conf.h.

◆ PWM0_GPIOS

#define PWM0_GPIOS { GPIO25, GPIO0, GPIO2, GPIO17 }

PWM channels for device PWM_DEV(0)

Definition at line 104 of file periph_conf.h.

◆ PWM1_GPIOS

#define PWM1_GPIOS { GPIO22, GPIO23 }

PWM_DEV(1) is not used.

Definition at line 109 of file periph_conf.h.

◆ SPI0_CS0

#define SPI0_CS0 GPIO18

VSPI CS0.

Definition at line 137 of file periph_conf.h.

◆ SPI0_CTRL

#define SPI0_CTRL VSPI

VSPI is used as SPI_DEV(0)

Definition at line 125 of file periph_conf.h.

◆ SPI0_MISO

#define SPI0_MISO GPIO19

VSPI MISO.

Definition at line 131 of file periph_conf.h.

◆ SPI0_MOSI

#define SPI0_MOSI GPIO27

VSPI MOSI.

Definition at line 134 of file periph_conf.h.

◆ SPI0_SCK

#define SPI0_SCK GPIO5

VSPI SCK.

Definition at line 128 of file periph_conf.h.

◆ UART0_RXD

#define UART0_RXD GPIO3

direct I/O pin for UART_DEV(0) RxD, can't be changed

Definition at line 153 of file periph_conf.h.

◆ UART0_TXD

#define UART0_TXD GPIO1

direct I/O pin for UART_DEV(0) TxD, can't be changed

Definition at line 152 of file periph_conf.h.

◆ UART1_RXD

#define UART1_RXD GPIO9

direct I/O pin for UART_DEV(1) RxD

Definition at line 160 of file periph_conf.h.

◆ UART1_TXD

#define UART1_TXD GPIO10

direct I/O pin for UART_DEV(1) TxD

Definition at line 157 of file periph_conf.h.