/// <summary>
/// Begin
/// Initializes the Character LCD and MCP23017
/// </summary>
/// <param name="cols"></param>
/// <param name="lines"></param>
/// <param name="dotsize"></param>
/// <returns></returns>
public async Task BeginAsync(int cols, int lines, int dotsize = LCD_5x8DOTS)
{
await MCP.InitMCP23017Async();
MCP.pinMode(RWPin, Mcp23017.Direction.OUTPUT);
MCP.pinMode(RSPin, Mcp23017.Direction.OUTPUT);
MCP.pinMode(EnablePin, Mcp23017.Direction.OUTPUT);
foreach (var pin in DataPins)
{
MCP.pinMode(pin, Mcp23017.Direction.OUTPUT);
}
foreach (var pin in ButtonPins)
{
MCP.pinMode(pin, Mcp23017.Direction.INPUT);
MCP.pullUp(pin, Mcp23017.Level.HIGH);
}
foreach (var pin in ColorPins)
{
MCP.pinMode(pin, Mcp23017.Direction.OUTPUT);
}
setBacklight(WHITE);
if (lines > 1)
{
DisplayFunction |= LCD_2LINE;
}
NumLines = lines;
NumColumns = cols;
CurrentLine = 0;
CurrentCol = 0;
// for some 1 line displays you can select a 10 pixel high font
if ((dotsize != 0) && (lines == 1))
{
DisplayFunction |= LCD_5x10DOTS;
}
// Pull both RS and R/W low to begin commands
MCP.digitalWrite(RSPin, Mcp23017.Level.LOW);
MCP.digitalWrite(EnablePin, Mcp23017.Level.LOW);
MCP.digitalWrite(RWPin, Mcp23017.Level.LOW);
//put the LCD into 4 bit or 8 bit mode
if (0 == (DisplayFunction & LCD_8BITMODE))
{
// this is according to the hitachi HD44780 datasheet
// figure 24, pg 46
// we start in 8bit mode, try to set 4 bit mode
write4bits(0x03);
usDelay(4500);
// second try
write4bits(0x03);
usDelay(4500);
// third go!
write4bits(0x03);
usDelay(150);
// finally, set to 8-bit interface
write4bits(0x02);
}
else
{
// this is according to the hitachi HD44780 datasheet
// page 45 figure 23
// Send function set command sequence
command((byte)(LCD_FUNCTIONSET | DisplayFunction));
usDelay(4500);
// second try
command((byte)(LCD_FUNCTIONSET | DisplayFunction));
usDelay(150);
// third go
command((byte)(LCD_FUNCTIONSET | DisplayFunction));
}
// finally, set # lines, font size, etc.
command((byte)(LCD_FUNCTIONSET | DisplayFunction));
// turn the display on with no cursor or blinking default
DisplayControl = (byte)(LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF);
display();
// clear it off
clear();
// Initialize to default text direction (for romance languages)
DisplayMode = (byte)(LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT);
// set the entry mode
command((byte)(LCD_ENTRYMODESET | DisplayMode));
}
