ftoled-display-device

C++ implementation

#pragma XOD require "https://github.com/freetronics/FTOLED"
// Include C++ library:
{{#global}}
#include <SPI.h>
#include <FTOLED.h>
{{/global}}

// Adafruit_PN532 class wants to know ports 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(OLED)];
};

// Define our custom type as a pointer on the class instance.
using Type = OLED*;

{{ 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 pin_cs = getValue<input_pin_cs>(ctx);
    auto pin_dc = getValue<input_pin_dc>(ctx);
    auto pin_reset = getValue<input_pin_reset>(ctx);

    // Create a new object in the memory area reserved previously.
    // Instead of the `reset` port, specify `NOT_A_PORT`, since it is not needed
    Type Display = new (state->mem) OLED(pin_cs, pin_dc, pin_reset);
    Display->begin();
    emitValue<output_DEV>(ctx, Display);
}