/*********************************************************************
* Function: bool LCD_Initialize(void);
*
* Overview: Initializes the LCD screen. Can take several hundred
* milliseconds.
*
* PreCondition: none
*
* Input: None
*
* Output: true if initialized, false otherwise
*
********************************************************************/
bool LCD_Initialize ( void )
{
LCD_DATA_LAT &= 0xFF00 ;
LCD_DATA_TRIS &= 0xFF00 ;
// Control signal data pins
LCD_RWSignal_Clear ( ) ; // LCD R/W signal
LCD_RSSignal_Clear ( ) ; // LCD RS signal
LCD_EnableSignal_Clear ( ) ; // LCD E signal
// Control signal pin direction
LCD_RSSignal_Output ( ) ;
LCD_RWSignal_Output ( ) ;
LCD_EnableSignal_Output ( ) ;
LCD_EnableSignal_Set ( ) ;
LCD_Wait ( LCD_STARTUP ) ;
LCD_Wait ( LCD_STARTUP ) ;
LCD_SendCommand ( LCD_COMMAND_SET_MODE_8_BIT , LCD_F_INSTR + LCD_STARTUP ) ;
LCD_SendCommand ( LCD_COMMAND_CURSOR_OFF , LCD_F_INSTR ) ;
LCD_SendCommand ( LCD_COMMAND_ENTER_DATA_MODE , LCD_S_INSTR ) ;
LCD_ClearScreen ( ) ;
return true ;
}
/*********************************************************************
* Function: static void LCD_SendCommand(char data)
*
* Overview: Sends command to LCD
*
* PreCondition: None
*
* Input: char - contains the command to be sent to the LCD
* unsigned int - has the specific delay for the command
*
* Output: None
*
********************************************************************/
static void LCD_SendCommand ( char command , unsigned int delay )
{
LCD_DATA_LAT &= 0xFF00 ;
LCD_DATA_LAT |= command ;
LCD_RWSignal_Clear ( ) ;
LCD_RSSignal_Clear ( ) ;
LCD_EnableSignal_Set ( ) ;
Nop ( ) ;
Nop ( ) ;
Nop ( ) ;
LCD_EnableSignal_Clear ( ) ;
LCD_EnableSignal_Clear ( ) ;
LCD_Wait ( delay ) ;
}
/*********************************************************************
* Function: static void LCD_SendData(char data)
*
* Overview: Sends data to LCD
*
* PreCondition: None
*
* Input: char - contains the data to be sent to the LCD
*
* Output: None
*
********************************************************************/
static void LCD_SendData ( char data )
{
LCD_RWSignal_Clear ( ) ;
LCD_RSSignal_Set ( ) ;
LCD_DATA_LAT &= 0xFF00 ;
LCD_DATA_LAT |= data ;
LCD_EnableSignal_Set ( ) ;
Nop ( ) ;
Nop ( ) ;
Nop ( ) ;
LCD_EnableSignal_Clear ( ) ;
LCD_RSSignal_Clear ( ) ;
LCD_Wait ( LCD_F_INSTR ) ;
}
/*********************************************************************
* Function: bool LCD_Initialize(void);
*
* Overview: Initializes the LCD screen. Can take several hundred
* milliseconds.
*
* PreCondition: none
*
* Input: None
*
* Output: true if initialized, false otherwise
*
********************************************************************/
bool LCD_Initialize(void)
{
LATC |= 0x00FF;
TRISC &= 0x0F00;
TRISB &= 0xFC7F;
// Control signal data pins
LATBbits.LATB8 = 0; // LCD R/W signal
LATBbits.LATB9 = 0; // LCD RS signal
LATBbits.LATB7 = 0; // LCD E signal
// Control signal pin direction
TRISBbits.TRISB8 = 0;
TRISBbits.TRISB9 = 0;
TRISBbits.TRISB7 = 0;
LATC |= 0x0038;
LATBbits.LATB7 = 1;
Nop();
Nop();
Nop();
LATBbits.LATB7 = 0;
LCD_Wait(LCD_STARTUP);
LCD_Wait(LCD_STARTUP);
LCD_SendCommand(LCD_COMMAND_SET_MODE_8_BIT, LCD_F_INSTR + LCD_STARTUP);
LCD_SendCommand(LCD_COMMAND_CURSOR_ON, LCD_F_INSTR);
LCD_SendCommand(LCD_COMMAND_ENTER_DATA_MODE, LCD_S_INSTR);
LCD_ClearScreen();
return true;
}
//функция записи данных
void LCD_WriteData(unsigned char data)
{
LCD_Wait();
SetBit(PORT_SIG_RS, RS); //установка RS в 1 - данные
LCD_CommonFunc(data);
}
//функция записи команды
void LCD_WriteCom(unsigned char data)
{
LCD_Wait();
ClearBit(PORT_SIG_RS, RS); //установка RS в 0 - команды
LCD_CommonFunc(data);
}