Pi Pico SSD1306 C++ Library

1. Description

This is a C++ library for raspberry pi pico.

It's based on offical pi pico examples. If you are interested in it, you can find it here Pico Examples OLED I2C.

2.Function Lists

Function	Introduction
void show()	Send all data buffer to oled
void clear()	Make all data buffer to 0
void isDisplay(bool inverse)	1 display on , 0 display off
void isInverse(bool inverse)	1 inverse, 0 no inverse
void drawFastHLine()	draw fast horizontal line
void drawFastVertical()	draw fast vertical line
void drawLine()	Draw any angle line you want
void drawRectangle(）	Draw a rectangle
void drawFilledRectanle()	Draw a filled rectangle
void drawCircle()	Draw a cicrle
void drawFilledCircle()	Draw a filled circle
void isScroll()	Turn on/off scroll
void setScrollDir()	1 scroll right,0 scroll left
void setFont()	Set font, adafruit font support
void printChar()	print a character
void print()	print a string
void drawBitmap()	draw an image

3.Usage

3.1 File Structure

If you want to use this library, your file structure should be like this:

build(build files, including .uf2 file)
src(source code folder)
- lib
  - OLED(oled library)
- bitmap.h(for display images)
- OLEDDISPLAY.cpp(main programme)
CMakeLists.txt(for cmake)

This repository does not have build folder, you need to cmake yourself.

The main programme is at OLEDDISPLAY.cpp file.

You may need to change CMakeLists.txt file according to your enviroment.

3.2 Declare an oled object

#include "OLED.h"

int main(){
    // SCL, SDA, Width, Height, Frequency, Upside-down, I2C Port
    OLED oled(5, 4, 128, 64, 400000, false, i2c0);
    return 0;
}

Note that, in this library I use default I2C0 and default I2C pins which is GPIO4-SDA and GPIO5-SCL, you can change it using other default i2c pins. Here I use SSD1306 recommanded I2C max speed, 400KHz.

The 6th parameter to the constructor call is whether the screen whould be upside-down or not. If true, the screen will be reversed.

3.3 Draw some shapes

#include "OLED.h"

int main(){
    // SCL, SDA, Width, Height, Frequency, Upside-down, I2C Port
    OLED oled(5, 4, 128, 64, 400000, false, i2c0);
    // Rectangle
    oled.drawRectangle(0, 0, 50, 30);
    oled.drawFilledRectangle(5, 5, 40, 20);
    // Circle
    oled.drawCircle(100, 16, 14);
    oled.drawFilledCircle(100, 16, 10);
    // Send data buffer to oled
    oled.show();
    return 0;
}

Note that you must call show() function after you finish draw shapes. So as print text or draw image, you need call show function too.

3.4 Print text

#include "OLED.h"
#include "Cherry_Cream_Soda_Regular_16.h"

int main(){
    // SCL, SDA, Width, Height, Frequency, Upside-down, I2C Port
    OLED oled(5, 4, 128, 64, 400000, false, i2c0);
    //String 1 "Hello", use defaule font
    uint8_t string1[] = "Hello";
    oled.print(0, 38, string1);
    // String 2 "world!", use custom font
    oled.setFont(&Cherry_Cream_Soda_Regular_16);
    uint8_t string2[] = "world!";
    oled.print(60, 32, string2);
    // Draw a text baseline and send data buffer
    oled.drawLine(0, 60, 128, 60);
    oled.show();
    return 0;
}

This library is adafruit font supported, because it's really popular among makers.

You can custom your own font through this website Font Genertor. You can modify some characters using this website Adafruit Font Customiser.

3.5 Draw some images

#include "OLED.h"
#include "bitmap.h"

int main(){
    // SCL, SDA, Width, Height, Frequency, I2C Port
    OLED oled(5, 4, 128, 64, 400000, i2c0);
    // Draw two images
    oled.drawBitmap(0, 0, 40, 32, pressure_40x32);
    oled.drawBitmap(45, 3, 32, 32, temperature_32x32);
    // Send data buffer to oled
    oled.show();
    return 0;
}

You should know that both font and image, the origin point is set at top left.

That's all. Happy hacking.

jfoucher/Pi-Pico-SSD1306-C-Library