void lcdControlWrite(u08 data)
{
// write the control byte to the display controller
#ifdef LCD_PORT_INTERFACE
lcdBusyWait(); // wait until LCD not busy
cbi(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "control"
cbi(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "write"
#ifdef LCD_DATA_4BIT
// 4 bit write
sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)|0xF0); // set data I/O lines to output (4bit)
outb(LCD_DATA_POUT,(inb(LCD_DATA_PIN) &0x0F) | (data&0xF0) ); // output data, high 4 bits
LCD_DELAY; // wait
LCD_DELAY; // wait
cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
LCD_DELAY; // wait
LCD_DELAY; // wait
sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
outb(LCD_DATA_POUT,(inb(LCD_DATA_PIN)&0x0F) | (data<<4) ); // output data, low 4 bits
LCD_DELAY; // wait
LCD_DELAY; // wait
cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
#else
// 8 bit write
sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
outb(LCD_DATA_DDR, 0xFF); // set data I/O lines to output (8bit)
outb(LCD_DATA_POUT,data);
LCD_DELAY; // wait
LCD_DELAY; // wait
cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
#endif
// leave data lines in input mode so they can be most easily used for other purposes
#ifdef LCD_DATA_4BIT
outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit)
outb(LCD_DATA_POUT,inb(LCD_DATA_PIN) |0xF0); // set pull-ups to on (4bit)
#else
outb(LCD_DATA_DDR, 0x00); // set data I/O lines to input (8bit)
outb(LCD_DATA_POUT,0xFF); // set pull-ups to on (8bit)
#endif
#else
// memory bus write
//sbi(MCUCR, SRW); // enable RAM waitstate
lcdBusyWait(); // wait until LCD not busy
*((volatile unsigned char *) (LCD_CTRL_ADDR)) = data;
//cbi(MCUCR, SRW); // disable RAM waitstate
#endif
}
u08 lcdDataRead(void)
{
// read a data byte from the display
register u08 data;
#ifdef LCD_PORT_INTERFACE
lcdBusyWait(); // wait until LCD not busy
#ifdef LCD_DATA_4BIT
outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit)
outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0); // set pull-ups to on (4bit)
#else
outb(LCD_DATA_DDR, 0x00); // set data I/O lines to input (8bit)
outb(LCD_DATA_POUT, 0xFF); // set pull-ups to on (8bit)
#endif
sbi(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "data"
sbi(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "read"
#ifdef LCD_DATA_4BIT
// 4 bit read
sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
LCD_DELAY; // wait
data = inb(LCD_DATA_PIN)&0xF0; // input data, high 4 bits
cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
LCD_DELAY; // wait
LCD_DELAY; // wait
sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
LCD_DELAY; // wait
data |= inb(LCD_DATA_PIN)>>4; // input data, low 4 bits
cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
#else
// 8 bit read
sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
LCD_DELAY; // wait
data = inb(LCD_DATA_PIN); // input data, 8bits
cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
#endif
// leave data lines in input mode so they can be most easily used for other purposes
#else
// memory bus read
//sbi(MCUCR, SRW); // enable RAM waitstate
lcdBusyWait(); // wait until LCD not busy
data = *((volatile unsigned char *) (LCD_DATA_ADDR));
//cbi(MCUCR, SRW); // disable RAM waitstate
#endif
return data;
}
/**
* Writes instructions to the LCD
*
* Inputs: db LCD instruction
* rs for commands, rs = 0
* for sending data, rs = 1
*/
static void lcdWrite(BYTE db, BYTE rs) {
lcdBusyWait();
LCD_RW(0);
LCD_RS(rs);
LCD_DATA_DDR = 0xFF; /* output */
LCD_DATA_PORT = db;
delay_us(LCD_DELAY_EN); /* RS, RW Setup Time (Minimum: 60ns) */
lcdToggleEn();
}
/**
* Initializes LCD
*/
void lcdInit() {
LCD_CTRL_DDR = _BV(LCD_RS_PIN)|_BV(LCD_RW_PIN)|_BV(LCD_EN_PIN);
delay_us(LCD_DELAY_START);
lcdWrite(LCD_CMD_FUNCTION, 0);
lcdBusyWait();
lcdWrite(LCD_CMD_DISP, 0);
lcdBusyWait();
lcdClear();
lcdWrite(LCD_CMD_ENTRY, 0);
lcdBusyWait();
/* printf */
fdevopen((void*)lcdPrint, 0);
}
/**
* Clears LCD screen
*/
void lcdClear() {
lcdWrite(LCD_CMD_CLEAR, 0);
lcdBusyWait();
delay_us(LCD_DELAY_SHORT);
lcdGoTo(0,0);
}
