/*
* Sends a command byte to the 44780.
*/
void lcdCmd(uint8_t cmd) {
wait_not_busy();
PORTC = (PORTC | PORTC_44780_DATA) & (cmd | (0x0F & ~PORTC_44780_RS));
e_pulse();
PORTC = (PORTC | PORTC_44780_DATA) & ((cmd << 4) | (0x0F & ~PORTC_44780_RS));
e_pulse();
}
/*
* Writes a char on the LCD at the current position.
*/
void lcdPutc(char c) {
uint8_t b;
wait_not_busy();
b = c | 0x0F;
PORTC = (PORTC | PORTC_44780_DATA | PORTC_44780_RS) & (c | 0x0F);
e_pulse();
PORTC = (PORTC | PORTC_44780_DATA | PORTC_44780_RS) & ((c << 4) | 0x0F);
e_pulse();
}
void send_char(unsigned char data)
{
RS=1; //set rs into write mode
LCD_DATA=data;
delay(50);
e_pulse();
}
//========================================================================================
// LCD functions
//========================================================================================
void send_config(unsigned char data)
{
RS=0; //clear rs into config mode
LCD_DATA=data;
delay(50);
e_pulse();
}
/*
* 44780 soft reset procedure.
*/
void lcdInit(void) {
PORTC = (PORTC & ~(PORTC_44780_DATA | PORTC_44780_RS | PORTC_44780_E | PORTC_44780_RW)) |
(LCD_CMD_INIT8 & PORTC_44780_DATA);
chThdSleep(50);
e_pulse();
chThdSleep(10);
e_pulse();
chThdSleep(2);
e_pulse();
wait_not_busy();
PORTC = (PORTC & ~(PORTC_44780_DATA | PORTC_44780_RS | PORTC_44780_E | PORTC_44780_RW)) |
(LCD_CMD_INIT4 & PORTC_44780_DATA);
e_pulse();
lcdCmd(LCD_CMD_INIT4);
lcdCmd(LCD_SET_DM | LCD_DM_DISPLAY_ON);
lcdCmd(LCD_SET_INCREMENT_MODE);
}
