wordclock/libraries/States/ViewTextState.cpp

#include <ViewStates.h>

ViewTextState::ViewTextState(AT24C32 &_at24c32)
{
  at24c32 = _at24c32;
  renderOffset = (millis() / TEXT_INTERVAL);
};

void ViewTextState::render(uint8_t matrix[121], ControlStates controlState)
{
  length = at24c32.read(TEXT_SIZE_ADDRESS);

  if (controlState != ControlStates::TEXT)
  {
    for (uint8_t i = 0; i < length; i++)
    {
      text[i] = at24c32.read(TEXT_ADDRESS + i);
    }
    writeText(matrix);
  }
  else
  {
    bool const blink = (millis() / CONTROL_BLINK_INTERVAL) % 2 == 0;
    position = 0;
    text[0] = 0x20;
    text[1] = 0x20;
    if (length > 2)
    {
      text[0] = at24c32.read(TEXT_ADDRESS + length - 2);
      if (blink)
      {
        text[1] = at24c32.read(TEXT_ADDRESS + length - 1);
      }
    }
    else if (length > 1 && blink)
    {
      text[0] = at24c32.read(TEXT_ADDRESS + length - 1);
    }
    writeChars(matrix);
  }
}

void ViewTextState::writeText(uint8_t matrix[121])
{
  position = (millis() / TEXT_INTERVAL - renderOffset - 1) % (length + 2);
  writeChars(matrix);
}

void ViewTextState::writeChars(uint8_t matrix[121])
{
  uint8_t char1 = 0x20;

  uint8_t char2 = 0x20;

  if (length > position)
  {
    char1 = text[position];
  }

  if (length > position + 1)
  {
    char2 = text[position + 1];
  }

  for (int col = 0; col < 5; col++)
  {
    // created ascii chars in 'ascii_memory.ino' to  AT23C32 epromm
    uint8_t char1Byte = at24c32.read(char1 * 5 + col);
    uint8_t char2Byte = at24c32.read(char2 * 5 + col);

    for (int row = 0; row < 8; row++)
    {
      if (!!(char1Byte & (1 << row)))
      {
        matrix[(row + v_offset) * 11 + col] = color;
      }

      if (!!(char2Byte & (1 << row)))
      {
        matrix[(row + v_offset) * 11 + col + 6] = color;
      }
    }
  }
}