Reset pin (using Arduino pin numbering), or -1 if not used (some displays might be wired to share the microcontroller's reset pin).
DEV@/ssd1306-oled-i2c-device
An SSD1306 OLED device.
To use the node in your project you should have the wayland/ssd1306-oled-i2c library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.
C++ implementation
#pragma XOD error_raise enable
// Tell XOD where it could download the library:
#pragma XOD require "https://github.com/adafruit/Adafruit_SSD1306"
#pragma XOD require "https://github.com/adafruit/Adafruit-GFX-Library"
#pragma XOD require "https://github.com/adafruit/Adafruit_BusIO"
//Include C++ libraries
{{#global}}
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
{{/global}}
// Adafruit_SSD1306 class wants to know I2C bus in the moment of instantiation
// but we don't know them at this moment.
// Therefore, we reserve memory to store an instance of the class,
// and create the instance later:
struct State {
uint8_t mem[sizeof(Adafruit_SSD1306)];
};
// Define our custom type as a pointer on the class instance.
using Type = Adafruit_SSD1306*;
{{ GENERATED_CODE }}
void evaluate(Context ctx) {
// It should be evaluated only once on the first (setup) transaction
if (!isSettingUp())
return;
auto state = getState(ctx);
auto wire = getValue<input_I2C>(ctx);
auto width = getValue<input_WIDTH>(ctx);
auto height = getValue<input_HEIGHT>(ctx);
auto reset_pin = getValue<input_RESET_PIN>(ctx);
// Create a new object in the memory area reserved previously.
Type display = new (state->mem) Adafruit_SSD1306(width, height, wire, reset_pin);
// Attempt to initialize display module; if attempt fails raise error
auto address = getValue<input_ADDRESS>(ctx);
if (!display->begin(SSD1306_SWITCHCAPVCC, address)) {
raiseError(ctx);
return;
}
emitValue<output_DEV>(ctx, display);
}