ESP32-C3(NodeMCU ESP-C3-32S-Kit) drive SSD1331 SPI Color OLED, in arduino-esp32 framework.

This video show how to drive 0.95 inch 96x64 SSD1331 SPI Color OLED with NodeMCU ESP-C3-32S-Kit in arduino-esp32 framework.

Install "Adafruit SSD1331 OLED Driver Library for Arduino" in Arduino IDE Library Manager. It support both hardware and software SPI interface to SSD1331.

In arduino-esp32, the hardware SPI pins of "ESP32C3 DevModule" are pre-defined at:

SS  : 7
MOSI: 6
MISO: 5
SCK : 4

ref: Last post - Get ESP32-C3 chip info and predefined pins (arduino-esp32)

But on AI Thinker NodeMCU ESP-C3-32S-Kit, the LEDs connect to:

LED_R:		IO3
LED_G:		IO4
LED_B:		IO5
LED_Cool:	IO19
LED_Warm:	IO18

ref: ESP-C3-32S-Kit Specification

So I use software SPI to interface with SPI SSD1331 Color OLED.

Connection between NodeMCU ESP-C3-32S-Kit and SPI SSD1331 Color OLED
(software SPI)
SSD1331	    ESP32C3
-------------------
GND	    GND
VCC	    3V3
SCL	    IO10
SDA	    IO9
RES	    IO8
DC	    IO7
CS	    IO6

Open test example of "Adafruit SSD1331 OLED Driver Library for Arduino", and modified as shown here:

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#include <Adafruit_GFX.h>
#include <Adafruit_SSD1331.h>
#include <SPI.h>


// You can use any (4 or) 5 pins
#define sclk 10
#define mosi 9
#define cs   6
#define rst  8
#define dc   7


// Color definitions
#define	BLACK           0x0000
#define	BLUE            0x001F
#define	RED             0xF800
#define	GREEN           0x07E0
#define CYAN            0x07FF
#define MAGENTA         0xF81F
#define YELLOW          0xFFE0
#define WHITE           0xFFFF

// Option 1: use any pins but a little slower
Adafruit_SSD1331 display = Adafruit_SSD1331(cs, dc, mosi, sclk, rst);

// Option 2: must use the hardware SPI pins
// (for UNO thats sclk = 13 and sid = 11) and pin 10 must be
// an output. This is much faster - also required if you want
// to use the microSD card (see the image drawing example)
//Adafruit_SSD1331 display = Adafruit_SSD1331(&SPI, cs, dc, rst);

float p = 3.1415926;
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