Adafruit_I2C_LCD_Backpack.cpp

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#include "Adafruit_I2C_LCD_Backpack.hh"

bool
Adafruit_I2C_LCD_Backpack::setup()
{
  if (!begin()) return (false);
  data_direction(0);
  return (false);
}

void
Adafruit_I2C_LCD_Backpack::write4b(uint8_t data)
{
  uint8_t buf[2];
  m_port.data = data;
  m_port.en = 1;
  buf[0] = m_port;
  m_port.en = 0;
  buf[1] = m_port;
  write(buf, sizeof(buf));
}

void
Adafruit_I2C_LCD_Backpack::write8b(uint8_t data)
{
  uint8_t buf[4];
  m_port.data = (data >> 4);
  m_port.en = 1;
  buf[0] = m_port;
  m_port.en = 0;
  buf[1] = m_port;
  m_port.data = data;
  m_port.en = 1;
  buf[2] = m_port.as_uint8;
  m_port.en = 0;
  buf[3] = m_port.as_uint8;
  write(buf, sizeof(buf));
}

void
Adafruit_I2C_LCD_Backpack::write8n(const void* buf, size_t size)
{
  const uint8_t* bp = (const uint8_t*) buf;
  while (size != 0) {
    uint8_t tmp[TMP_MAX];
    uint8_t n = (size > sizeof(tmp) / 4 ? sizeof(tmp) / 4 : size);
    size -= n;
    uint8_t m = n * 4;
    for (uint8_t i = 0; i < m;) {
      uint8_t data = *bp++;
      m_port.data = (data >> 4);
      m_port.en = 1;
      tmp[i++] = m_port;
      m_port.en = 0;
      tmp[i++] = m_port;
      m_port.data = data;
      m_port.en = 1;
      tmp[i++] = m_port;
      m_port.en = 0;
      tmp[i++] = m_port;
    }
    write(tmp, m);
  }
}

void
Adafruit_I2C_LCD_Backpack::set_mode(uint8_t flag)
{
  m_port.rs = flag;
}

void
Adafruit_I2C_LCD_Backpack::set_backlight(uint8_t flag)
{
  m_port.bt = flag;
  write(m_port.as_uint8);
}