Wemos LOLIN D32 Pro

Support for Wemos LOLIN D32 Pro.

Table of Contents

1. Overview
2. Hardware
   1. MCU
   2. Board Configuration
   3. Board Pinout
   4. Optional Hardware Configurations
3. Flashing the Device

Overview [TOC]

Wemos LOLIN D32 Pro is a development board that uses the ESP32-WROVER module which has a built-in 4 MByte SPI RAM. Most important features of the board are

• Micro-SD card interface
• TFT display interface
• SPI RAM 4 MByte

Wemos LOLIN D32 Pro belongs to the class of general purpose boards where most ESP32 pins are broken out for easier access.

Hardware [TOC]

This section describes

• the MCU,
• the default board configuration,
• optional hardware configurations,
• the board pinout.

MCU [TOC]

Most features of the board are provided by the ESP32 SoC. The following table summarizes these features and gives an overview of which of these features are supported by RIOT. For detailed information about the ESP32, see section .

MCU	ESP32	Supported by RIOT
Vendor	Espressif
Cores	1 or 2 x Tensilica Xtensa LX6	1 core
FPU	yes (ULP - Ultra low power co-processor)	no
RAM	520 kByte SRAM 16 kByte RTC SRAM	yes
ROM	520 kByte	yes
Flash	512 kByte … 16 MByte	yes
Frequency	240 MHz, 160 MHz, 80 MHz	yes
Power Consumption	68 mA @ 240 MHz 44 mA @ 160 MHz 31 mA @ 80 MHz 5 uA in deep sleep mode	yes yes yes no
Timers	4 x 64 bit	yes
ADCs	2 x SAR-ADC with up to 18 x 12 bit channels total	yes
DACs	2 x DAC with 8 bit	yes
GPIOs	34 (6 of them are only inputs)	yes
I2Cs	2	yes
SPIs	4	yes
UARTs	3	yes
WiFi	IEEE 802.11 b/g/n built in	yes
Bluetooth	v4.2 BR/EDR and BLE	no
Ethernet	MAC interface with dedicated DMA and IEEE 1588 support	yes
CAN	version 2.0	no
IR	up to 8 channels TX/RX	no
Motor PWM	2 devices x 6 channels	yes
LED PWM	16 channels	no
Crypto	Hardware acceleration of AES, SHA-2, RSA, ECC, RNG	no
Vcc	2.5 - 3.6 V
Documents	Datasheet Technical Reference

Board Configuration [TOC]

The board for the Wemos LOLIN D32 Pro has the following on-board components:

• 1 x LED
• 1 x Micro SD card interface
• 1 x TFT display connector

The following table shows the default board configuration, which is sorted according to the defined functionality of GPIOs. This configuration can be overridden by an .

Pin	Default Configuration*	Optional Configuration*	Remarks / Prerequisites	Configuration
GPIO22	i2c.h::I2C_DEV:SCL
GPIO21	i2c.h::I2C_DEV:SDA
GPIO18	spi.h::SPI_DEV:SCK
GPIO19	spi.h::SPI_DEV:MISO
GPIO23	spi.h::SPI_DEV:MOSI
GPIO5	spi.h::SPI_DEV:CS0 / LED0
GPIO4	spi.h::SPI_DEV:CS1	SD Card CS	when module sdcard_spi is used
GPIO1	uart.h::UART_DEV:TxD		Console (configuration is fixed)
GPIO3	uart.h::UART_DEV:RxD		Console (configuration is fixed)
GPIO36	adc.h::ADC_LINE
GPIO39	adc.h::ADC_LINE
GPIO34	adc.h::ADC_LINE
GPIO35	adc.h::ADC_LINE		VBat measurement (GPIO is not broken out)
GPIO32	adc.h::ADC_LINE	TFT_LED	when TFT is connected
GPIO33	adc.h::ADC_LINE	TFT_RESET	when TFT is connected
GPIO25	dac.h::DAC_LINE
GPIO26	dac.h::DAC_LINE
GPIO0	pwm.h::PWM_DEV:0	MRF24J40/ENC28J60 RESET	when module mrf24j40/enc2860 is used
GPIO2	pwm.h::PWM_DEV:1	MRF24J40/ENC28J60 CS	when module mrf24j40/enc2860 is used
GPIO13	-	MRF24J40/ENC28J60 INT	when module mrf24j40/enc2860 is used
GPIO15	-
GPIO12	-	TS_CS	when TFT is connected
GPIO14	-	TFT_CS	when TFT is connected
GPIO27	-	TFT_DC	when TFT is connected

* Default configuration cannot be used or is not available at all when optional configuration is used. For example, when the TFT is connected, GPIO32 is used as TFT_LED signal and adc.h::ADC_LINE is not available.

Note

When the TFT display is connected, add the following line to the makefile of the application to enable the according default board and peripheral configuration:

USEMODULE += esp_lolin_tft

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

Optional Hardware Configurations [TOC]

MRF24J40-based IEEE 802.15.4 radio modules and ENC28J60-based Ethernet network interface modules have been tested with the board. You could use the following code in your to use such modules:

#ifdef BOARD_ESP32_WEMOS_LOLIN_D32_PRO

#if MODULE_MRF24J40
#define MRF24J40_PARAM_CS       GPIO15      /* MRF24J40 CS signal    */
#define MRF24J40_PARAM_RESET    GPIO2       /* MRF24J40 RESET signal */
#define MRF24J40_PARAM_INT      GPIO13      /* MRF24J40 INT signal   */
#endif

#if MODULE_ENC28J80
#define ENC28J80_PARAM_CS       GPIO15      /* ENC28J80 CS signal    */
#define ENC28J80_PARAM_RESET    GPIO2       /* ENC28J80 RESET signal */
#define ENC28J80_PARAM_INT      GPIO13      /* ENC28J80 INT signal   */
endif

#endif

For other parameters, the default values defined by the drivers can be used.

Note

• Only a few GPIOs are available for external hardware on the Wemos LOLIN D32 PRO. Therefore, MRF24J40 and ENC28J60 based modules use the same GPIOs and only one of these modules can be used simultaneously.
• The RESET signal of MRF24J40 and ENC28J60 based modules can also be connected to the RST pin of the board (see ) to keep the configured GPIO free for other purposes.

Board Pinout [TOC]

The following picture shows the pinout of WEMOS LOLIN D32 PRO board as defined by the default board configuration. The light green GPIOs are not used by configured on-board hardware components and can be used for any purpose. However, if optional off-board hardware modules are used, these GPIOs may also be occupied, see in table board configuration.

The corresponding board schematic can be found here.

MCU [TOC]

Most features of the board are provided by the ESP32 SoC. The following table summarizes these features and gives an overview of which of these features are supported by RIOT. For detailed information about the ESP32, see section .

MCU	ESP32	Supported by RIOT
Vendor	Espressif
Cores	1 or 2 x Tensilica Xtensa LX6	1 core
FPU	yes (ULP - Ultra low power co-processor)	no
RAM	520 kByte SRAM 16 kByte RTC SRAM	yes
ROM	520 kByte	yes
Flash	512 kByte … 16 MByte	yes
Frequency	240 MHz, 160 MHz, 80 MHz	yes
Power Consumption	68 mA @ 240 MHz 44 mA @ 160 MHz 31 mA @ 80 MHz 5 uA in deep sleep mode	yes yes yes no
Timers	4 x 64 bit	yes
ADCs	2 x SAR-ADC with up to 18 x 12 bit channels total	yes
DACs	2 x DAC with 8 bit	yes
GPIOs	34 (6 of them are only inputs)	yes
I2Cs	2	yes
SPIs	4	yes
UARTs	3	yes
WiFi	IEEE 802.11 b/g/n built in	yes
Bluetooth	v4.2 BR/EDR and BLE	no
Ethernet	MAC interface with dedicated DMA and IEEE 1588 support	yes
CAN	version 2.0	no
IR	up to 8 channels TX/RX	no
Motor PWM	2 devices x 6 channels	yes
LED PWM	16 channels	no
Crypto	Hardware acceleration of AES, SHA-2, RSA, ECC, RNG	no
Vcc	2.5 - 3.6 V
Documents	Datasheet Technical Reference

Board Configuration [TOC]

The board for the Wemos LOLIN D32 Pro has the following on-board components:

• 1 x LED
• 1 x Micro SD card interface
• 1 x TFT display connector

The following table shows the default board configuration, which is sorted according to the defined functionality of GPIOs. This configuration can be overridden by an .

Pin	Default Configuration*	Optional Configuration*	Remarks / Prerequisites	Configuration
GPIO22	i2c.h::I2C_DEV:SCL
GPIO21	i2c.h::I2C_DEV:SDA
GPIO18	spi.h::SPI_DEV:SCK
GPIO19	spi.h::SPI_DEV:MISO
GPIO23	spi.h::SPI_DEV:MOSI
GPIO5	spi.h::SPI_DEV:CS0 / LED0
GPIO4	spi.h::SPI_DEV:CS1	SD Card CS	when module sdcard_spi is used
GPIO1	uart.h::UART_DEV:TxD		Console (configuration is fixed)
GPIO3	uart.h::UART_DEV:RxD		Console (configuration is fixed)
GPIO36	adc.h::ADC_LINE
GPIO39	adc.h::ADC_LINE
GPIO34	adc.h::ADC_LINE
GPIO35	adc.h::ADC_LINE		VBat measurement (GPIO is not broken out)
GPIO32	adc.h::ADC_LINE	TFT_LED	when TFT is connected
GPIO33	adc.h::ADC_LINE	TFT_RESET	when TFT is connected
GPIO25	dac.h::DAC_LINE
GPIO26	dac.h::DAC_LINE
GPIO0	pwm.h::PWM_DEV:0	MRF24J40/ENC28J60 RESET	when module mrf24j40/enc2860 is used
GPIO2	pwm.h::PWM_DEV:1	MRF24J40/ENC28J60 CS	when module mrf24j40/enc2860 is used
GPIO13	-	MRF24J40/ENC28J60 INT	when module mrf24j40/enc2860 is used
GPIO15	-
GPIO12	-	TS_CS	when TFT is connected
GPIO14	-	TFT_CS	when TFT is connected
GPIO27	-	TFT_DC	when TFT is connected

* Default configuration cannot be used or is not available at all when optional configuration is used. For example, when the TFT is connected, GPIO32 is used as TFT_LED signal and adc.h::ADC_LINE is not available.

Note

When the TFT display is connected, add the following line to the makefile of the application to enable the according default board and peripheral configuration:

USEMODULE += esp_lolin_tft

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

Optional Hardware Configurations [TOC]

MRF24J40-based IEEE 802.15.4 radio modules and ENC28J60-based Ethernet network interface modules have been tested with the board. You could use the following code in your to use such modules:

#ifdef BOARD_ESP32_WEMOS_LOLIN_D32_PRO

#if MODULE_MRF24J40
#define MRF24J40_PARAM_CS       GPIO15      /* MRF24J40 CS signal    */
#define MRF24J40_PARAM_RESET    GPIO2       /* MRF24J40 RESET signal */
#define MRF24J40_PARAM_INT      GPIO13      /* MRF24J40 INT signal   */
#endif

#if MODULE_ENC28J80
#define ENC28J80_PARAM_CS       GPIO15      /* ENC28J80 CS signal    */
#define ENC28J80_PARAM_RESET    GPIO2       /* ENC28J80 RESET signal */
#define ENC28J80_PARAM_INT      GPIO13      /* ENC28J80 INT signal   */
endif

#endif

For other parameters, the default values defined by the drivers can be used.

Note

• Only a few GPIOs are available for external hardware on the Wemos LOLIN D32 PRO. Therefore, MRF24J40 and ENC28J60 based modules use the same GPIOs and only one of these modules can be used simultaneously.
• The RESET signal of MRF24J40 and ENC28J60 based modules can also be connected to the RST pin of the board (see ) to keep the configured GPIO free for other purposes.

Board Pinout [TOC]

The following picture shows the pinout of WEMOS LOLIN D32 PRO board as defined by the default board configuration. The light green GPIOs are not used by configured on-board hardware components and can be used for any purpose. However, if optional off-board hardware modules are used, these GPIOs may also be occupied, see in table board configuration.

The corresponding board schematic can be found here.

Flashing the Device [TOC]

Flashing RIOT is quite easy. The board has a Micro-USB connector with reset/boot/flash logic. Just connect the board to your host computer using the programming port and type:

make flash BOARD=esp32-wemos-lolin-d32-pro ...

For detailed information about ESP32 as well as configuring and compiling RIOT for ESP32 boards, see .