/* -------------------------------------------------------------------------- */
void WriteCommand( SCHR command )
{
pinLevel( LCD_RW, _LOW_ );
pinLevel( LCD_RS, _LOW_ );
SetDataBus( command );
EnableLCD();
}
/* -------------------------------------------------------------------------- */
void WriteData( SCHR data )
{
pinLevel( LCD_RW, _LOW_ );
pinLevel( LCD_RS, _HIGH_ );
SetDataBus( data );
EnableLCD();
}
void WriteLCD(unsigned char word, unsigned commandType, unsigned usDelay) {
// TODO: Using bit masking and shift operations, write most significant bits to correct
// bits of the LCD_D signal (i.e. #define used to map internal name to LATB)
// and enable the LCD for the correct command.
word &= 0xF0;
LCD_D |=(LCD_D & 0x0FFF)|(word<<8);
EnableLCD(commandType, usDelay);
// TODO: Using bit masking and shift operations, write least significant bits to correct
// bits of the LCD_D signal (i.e. #define used to map internal name to LATB)
// and enable the LCD for the correct command.
word &= 0x0F;
LCD_D |=(LCD_D & 0x0FFF)|(word<<12);
EnableLCD(commandType, usDelay);
}
void LCDInitialize(void) {
// Setup D, RS, and E to be outputs (0).
LCD_TRIS_D7 = 0;
LCD_TRIS_D6 =0;
LCD_TRIS_D5 =0;
LCD_TRIS_D4 =0;
LCD_TRIS_RS =0;
LCD_TRIS_E =0;
// Initilization sequence utilizes specific LCD commands before the general configuration
// commands can be utilized. The first few initialization commands cannot be done using the
// WriteLCD function. Additionally, the specific sequence and timing is very important.
// Enable 4-bit interface
// Function Set (specifies data width, lines, and font.
// 4-bit mode initialization is complete. We can now configure the various LCD
// options to control how the LCD will function.
LCD_D = (LCD_D & 0x0FFF) | 0x0000;
LCD_RS=0;
LCD_E=0;
DelayUs(15000);
LCD_D=(LCD_D & 0x0FFF) | 0x3000;
EnableLCD(LCD_WRITE_CONTROL, 4100);
LCD_D=(LCD_D & 0x0FFF) | 0x3000;
EnableLCD(LCD_WRITE_CONTROL, 100);
// TODO: Display On/Off Control
// Turn Display (D) Off
WriteLCD(0x08, 0, 40);
// TODO: Clear Display
LCDClear();
// TODO: Entry Mode Set
// Set Increment Display, No Shift (i.e. cursor move)
WriteLCD(0x06, 0, 40);
// TODO: Display On/Off Control
// Turn Display (D) On, Cursor (C) Off, and Blink(B) Off
WriteLCD(0x0C, 0, 40);
}
