Support for D-duino-32

[srolf]

Hardware:

Board: D-duino-32
Core Installation/update date: 17/dec/2017
IDE name: Arduino IDE 1.8.5
Flash Frequency: 80Mhz
Upload Speed: 115200

Description:

The D-duino-32 board (ESP32 with on-board I2C SSD1306 and OLED 128x64) is unluckily not using the standard pin assignment for SDA/SCL like 21/22, instead it uses 5/4.

Due to this problem it's not possible to use most of the I2C component libraries if these are not allowing to set explicitly the pins for SDA/SCL.

To resovle the problem, I tried to create a custom board description. With this it was possible to use the OLED by the Adafruit SSD1306 library as a display for a small MQTT listener.

Would it be possible to include this board in the list of supported ones?

The following mods were made (1st time in doing this, so I may have made something wrong):

\Arduino\hardware\espressif\esp32\boards.txt (added at the end)

##############################################################

ddunio32.name=D-duino-32

ddunio32.upload.tool=esptool
ddunio32.upload.maximum_size=1310720
ddunio32.upload.maximum_data_size=294912
ddunio32.upload.wait_for_upload_port=true

ddunio32.serial.disableDTR=true
ddunio32.serial.disableRTS=true

ddunio32.build.mcu=esp32
ddunio32.build.core=esp32
ddunio32.build.variant=dduino32
ddunio32.build.board=DDUINO32

ddunio32.build.f_cpu=240000000L
ddunio32.build.flash_mode=dio
ddunio32.build.flash_size=4MB
ddunio32.build.boot=dio
ddunio32.build.partitions=default

ddunio32.menu.FlashFreq.80=80MHz
ddunio32.menu.FlashFreq.80.build.flash_freq=80m
ddunio32.menu.FlashFreq.40=40MHz
ddunio32.menu.FlashFreq.40.build.flash_freq=40m

ddunio32.menu.UploadSpeed.921600=921600
ddunio32.menu.UploadSpeed.921600.upload.speed=921600
ddunio32.menu.UploadSpeed.115200=115200
ddunio32.menu.UploadSpeed.115200.upload.speed=115200
ddunio32.menu.UploadSpeed.256000.windows=256000
ddunio32.menu.UploadSpeed.256000.upload.speed=256000
ddunio32.menu.UploadSpeed.230400.windows.upload.speed=256000
ddunio32.menu.UploadSpeed.230400=230400
ddunio32.menu.UploadSpeed.230400.upload.speed=230400
ddunio32.menu.UploadSpeed.460800.linux=460800
ddunio32.menu.UploadSpeed.460800.macosx=460800
ddunio32.menu.UploadSpeed.460800.upload.speed=460800
ddunio32.menu.UploadSpeed.512000.windows=512000
ddunio32.menu.UploadSpeed.512000.upload.speed=512000

\Arduino\hardware\espressif\esp32\variants\dduino32\pins_arduino.h

#ifndef Pins_Arduino_h
#define Pins_Arduino_h

#include <stdint.h>

#define EXTERNAL_NUM_INTERRUPTS 16
#define NUM_DIGITAL_PINS        40
#define NUM_ANALOG_INPUTS       16

#define analogInputToDigitalPin(p)  (((p)<20)?(esp32_adc2gpio[(p)]):-1)
#define digitalPinToInterrupt(p)    (((p)<40)?(p):-1)
#define digitalPinHasPWM(p)         (p < 34)

static const uint8_t TX = 1;
static const uint8_t RX = 3;

static const uint8_t SDA = 5;
static const uint8_t SCL = 4;

static const uint8_t SS    = 15;
static const uint8_t MOSI  = 13;
static const uint8_t MISO  = 12;
static const uint8_t SCK   = 14;

static const uint8_t A0 = 36;
static const uint8_t A3 = 39;
static const uint8_t A10 = 4;
static const uint8_t A11 = 0;
static const uint8_t A12 = 2;
static const uint8_t A13 = 15;
static const uint8_t A14 = 13;
static const uint8_t A15 = 12;
static const uint8_t A16 = 14;
static const uint8_t A18 = 25;
static const uint8_t A19 = 26;

static const uint8_t T0 = 4;
static const uint8_t T1 = 0;
static const uint8_t T2 = 2;
static const uint8_t T3 = 15;
static const uint8_t T4 = 13;
static const uint8_t T5 = 12;
static const uint8_t T6 = 14;

static const uint8_t DAC1 = 25;
static const uint8_t DAC2 = 26;

// Wemos Grove Shield
static const uint8_t D1 = 5;
static const uint8_t D2 = 4;
static const uint8_t D3 = 0;
static const uint8_t D4 = 2;
static const uint8_t D5 = 14;
static const uint8_t D6 = 12;
static const uint8_t D7 = 13;
static const uint8_t D8 = 15;
static const uint8_t D9 = 3;
static const uint8_t D10 = 1;

#endif /* Pins_Arduino_h */

[mszlachetka]

Workaround for this issue:

#include <Wire.h>
#include <driver/i2c.h>

#define SDA_NEW 5
#define SCL_NEW 4

TwoWire wire2(I2C_NUM_1); //I2C_NUM_0 will use default pins anyway
void setup()
{
Wire = wire2;
Wire.begin(SDA_NEW, SCL_NEW, 100000);
devices_which_use_default_Wire.begin();
}

Hope It helps :)
~Michal