File content as of revision 16:a004191a79ab:

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#include "Display.hpp"

/// @{
/// Width and height of the display in pixels.
static const int width = 128;
static const int height = 64;
/// @}

Display::Display(PinName mosi, PinName miso, PinName sclk, PinName ssel,
                 PinName a0)
    : canvas_(width, height), spi(mosi, miso, sclk), cs(ssel, 1), a0(a0, 0) {
  spi.format(8, 3); // CPOL = 1, CPHA = 1
}

void Display::initialize() {
  sendCommand(0xA0);
  sendCommand(0xAE);
  sendCommand(0xC0);
  sendCommand(0xA2);
  sendCommand(0x2F);
  sendCommand(0x26);
  sendCommand(0x81);
  sendCommand(0x11);
  sendCommand(0xAF);
}

void Display::update() {
  const int rowsPerPage = 8;
  const int pages = height / rowsPerPage;
  sendCommand(0xAE);
  sendCommand(0x40);
  for (int page = 0; page < pages; ++page) {
    sendCommand(0xB0 + page);
    sendCommand(0x10);
    sendCommand(0x00);
    for (int column = 0; column < width; ++column) {
      uint8_t segment = 0;
      for (int pixel = 0; pixel < rowsPerPage; ++pixel) {
        segment <<= 1;
        if (canvas_.pixelEnabled(column,
                                 ((pages - 1 - page) * rowsPerPage) + pixel)) {
          segment |= 1;
        }
      }
      sendData(segment);
    }
  }
  sendCommand(0xAF);
}

void Display::sendCommand(uint8_t command) {
  cs = 0;
  a0 = 0;
  spi.write(command);
  cs = 1;
}

void Display::sendData(uint8_t data) {
  cs = 0;
  a0 = 1;
  spi.write(data);
  cs = 1;
}