/*
* LcdWrite
* Description: This procedure simply writes a data byte to the LCD.
* It does not return until the LCD's busy flag is cleared.
*
* Argument: c: data byte
* Return: None
*
* Input: None
* Output: LCD
*
* Operation: Send the byte, then wait for the BF to be cleared.
*
* Revision History:
* Dec. 16, 2012 Nnoduka Eruchalu Initial Revision
*/
void LcdWrite(unsigned char c)
{
LCD_DATA_LAT = c; /* put data on output port */
SET_RS(); /* RS = 1: Data */
CLEAR_RW(); /* R/W = 0: Write */
LCD_STROBE();
LcdWaitBF(); /* dont exit until the LCD is no longer busy */
}
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 LCDByte(uint8_t c,uint8_t isdata)
{
//Sends a byte to the LCD in 4bit mode
//cmd=0 for data
//cmd=1 for command
//NOTE: THIS FUNCTION RETURS ONLY WHEN LCD HAS PROCESSED THE COMMAND
uint8_t hn,ln; //Nibbles
uint8_t temp;
hn=c>>4;
ln=(c & 0x0F);
if(isdata==0)
CLEAR_RS();
else
SET_RS();
_delay_us(0.500); //tAS
SET_E();
//Send high nibble
temp=(LCD_DATA_PORT & (~(0X0F<<LCD_DATA_POS)))|((hn<<LCD_DATA_POS));
LCD_DATA_PORT=temp;
_delay_us(1); //tEH
//Now data lines are stable pull E low for transmission
CLEAR_E();
_delay_us(1);
//Send the lower nibble
SET_E();
temp=(LCD_DATA_PORT & (~(0X0F<<LCD_DATA_POS)))|((ln<<LCD_DATA_POS));
LCD_DATA_PORT=temp;
_delay_us(1); //tEH
//SEND
CLEAR_E();
_delay_us(1); //tEL
LCDBusyLoop();
}
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();
}
void LCD_write_byte(uchar cmd,uchar data){
unsigned char data_temp;
if(cmd==1)
CLR_RS(); //向LCD写入命令
if(cmd==0)
SET_RS(); //向LCD写入数据
data_temp=data;
data_temp=data_temp>>4;
LCD_Write_half_byte(data_temp & 0x0F);
data_temp=data;
LCD_Write_half_byte(data_temp & 0x0F);
_delay_ms(1);
}
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 void sc2004_setPort(sc2004_port * rec)
{
sbi(*rec->pddr_rs, rec->portno_rs); //init port direction
sbi(*rec->pddr_rw, rec->portno_rw);
sbi(*rec->pddr_enable, rec->portno_enable);
SET_DDR_DATA_OUT;
SET_RS(0);
//SET_RW(0);
SET_DATA(0);
SET_ENABLE(0);
pcurrent_port = rec;
}
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);
};
