/*
* LcdWaitBF
* Description: This procedure simply loops until the LCD is not busy.
* This clears the RS bit.
*
* Argument: None
* Return: None
*
* Input: LCD's Busy Flag
* Output: None
*
* Operation: Keep on looping and reading the LCD busy flag. Exit when it
* indicates the LCD is not busy.
*
* Revision History:
* Dec. 16, 2012 Nnoduka Eruchalu Initial Revision
*/
void LcdWaitBF(void)
{
unsigned char busy, status=0x00;
LCD_DATA_TRIS = 0xFF; /* when reading a port change it to an input */
CLEAR_RS(); /* prepare to read BF and Address Counter */
SET_RW(); /* and put the LCD in read mode */
do {
SET_E(); /* during reads the E has to be active */
__delay_us(0.5); /* wait tPW for data to become available */
status = LCD_DATA_PORT; /* read in value on data lines */
busy = status & 0x80; /* busy flag is highest status bit */
__delay_us(0.5);
CLEAR_E(); /* pull E low for at least tC-tPW */
__delay_us(1);
} while(busy);
/* put the LCD in write mode */
CLEAR_RW(); /* in write mode when R/W\ is cleared */
LCD_DATA_TRIS = 0x00; /* and the I/O pins are set as outputs */
}
void LCDBusyLoop()
{
//This function waits till lcd is BUSY
uint8_t busy,status=0x00,temp;
//Change Port to input type because we are reading data
LCD_DATA_TRIS|=(0x0f<<LCD_DATA_POS);
//change LCD mode
SET_RW(); //Read mode
CLEAR_RS(); //Read status
//Let the RW/RS lines stabilize
__delay_us(0.5); //tAS
do
{
SET_E();
//Wait tDA for data to become available
__delay_us(0.5);
status=(LCD_DATA_PORT>>LCD_DATA_POS);
status=status<<4;
__delay_us(0.5);
//Pull E low
CLEAR_E();
__delay_us(1); //tEL
SET_E();
__delay_us(0.5);
temp=(LCD_DATA_PORT>>LCD_DATA_POS);
temp&=0x0F;
status=status|temp;
busy=status & 0b10000000;
__delay_us(0.5);
CLEAR_E();
__delay_us(1); //tEL
}while(busy);
CLEAR_RW(); //write mode
//Change Port to output
LCD_DATA_TRIS&=(~(0x0F<<LCD_DATA_POS));
}
inline void sc2004_ReturnHome(void)
{
SET_DDR_DATA_OUT;
SET_RS(0);
SET_RW(0);
SET_DATA(1<<DB1);
sc2004_PulseEnable();
}
inline void sc2004_ClearDisplay(void)
{
SET_DDR_DATA_OUT;
SET_RS(0);
SET_RW(0);
SET_DATA(1<<DB0);
sc2004_PulseEnable();
}
inline uint8_t sc2004_ReadData()
{
SET_DDR_DATA_IN;
SET_RS(1);
SET_RW(1);
sc2004_PulseEnable();
return GET_DATA;
}
inline void sc2004_WriteData(uint8_t data)
{
SET_DDR_DATA_OUT;
SET_RS(1);
SET_RW(0);
SET_DATA(data);
sc2004_PulseEnable();
}
void LCDBusyLoop()
{
//This function waits till lcd is BUSY
uint8_t busy,status=0x00,temp;
//Change Port to input type because we are reading data
LCD_DATA_DDR&=0xF0;
//change LCD mode
SET_RW(); //Read mode
CLEAR_RS(); //Read status
//Let the RW/RS lines stabilize
_delay_us(HALF); //tAS
do
{
SET_E();
//Wait tDA for data to become available
_delay_us(HALF);
status=LCD_DATA_PIN;
status=status<<4;
_delay_us(HALF);
//Pull E low
CLEAR_E();
_delay_us(ONE); //tEL
SET_E();
_delay_us(HALF);
temp=LCD_DATA_PIN;
temp&=0x0F;
status=status|temp;
busy=status & 0b10000000;
_delay_us(HALF);
CLEAR_E();
_delay_us(ONE); //tEL
} while(busy);
CLEAR_RW(); //write mode
//Change Port to output
LCD_DATA_DDR|=0x0F;
}
inline void sc2004_SetAddr_DDRAM(uint8_t addr)
{
SET_DDR_DATA_OUT;
SET_RS(0);
SET_RW(0);
SET_DATA( (1 << DB7)
| (addr & 0b01111111)
);
sc2004_PulseEnable();
}
inline void sc2004_EntryMode(uint8_t increment_direction, uint8_t display_shift)
{
SET_DDR_DATA_OUT;
SET_RS(0);
SET_RW(0);
SET_DATA( (1<<DB2)
| (increment_direction<<DB1)
| (display_shift<<DB0)
);
sc2004_PulseEnable();
}
inline void sc2004_CursorDisplayShift(uint8_t shift_display_or_cursor, uint8_t direction_right)
{
SET_DDR_DATA_OUT;
SET_RS(0);
SET_RW(0);
SET_DATA( (1<<DB4)
| (shift_display_or_cursor<<DB3)
| (direction_right<<DB2)
);
sc2004_PulseEnable();
}
inline void sc2004_DisplayMode(uint8_t display, uint8_t cursor, uint8_t cur_blink)
{
SET_DDR_DATA_OUT;
SET_RS(0);
SET_RW(0);
SET_DATA( (1<<DB3)
| (display<<DB2)
| (cursor <<DB1)
| (cur_blink<<DB0)
);
sc2004_PulseEnable();
}
inline void sc2004_FunctionSet(uint8_t length_is_8bit, uint8_t double_line, uint8_t wide_font)
{
SET_DDR_DATA_OUT;
SET_RS(0);
SET_RW(0);
SET_DATA( (1<<DB5)
| (length_is_8bit<<DB4)
| (double_line << DB3)
| (wide_font << DB2)
);
sc2004_PulseEnable();
}
inline uint8_t sc2004_ReadBusyAndAddress(uint8_t * addr)
{
uint8_t data;
SET_DDR_DATA_IN;
SET_RS(0);
SET_RW(1);
sc2004_PulseEnable();
data = GET_DATA;
if(addr)
*addr = data & 0b01111111;
return data & (1 << DB7);
};
