/**
* Backlight is open drain on pin D2, controlled by OC4, using Timer 3
* Contrast uses normal CMOS with OC3, also driven by Timer 3
*/
void lcd_init(void) {
//Set backlight to open drain
mPORTDOpenDrainOpen( BIT_2 );
//Start the timer for contrast/brightness PWM
OpenTimer3(T3_ON, LCD_PWMPERIOD);
//Enable contrast control
OpenOC3( OC_ON | OC_TIMER_MODE16 | OC_TIMER3_SRC | OC_CONTINUE_PULSE | OC_LOW_HIGH , LCD_PWMPERIOD, 0x500 );
//Enable brightness control
OpenOC4( OC_ON | OC_TIMER_MODE16 | OC_TIMER3_SRC | OC_CONTINUE_PULSE | OC_LOW_HIGH , LCD_PWMPERIOD, 0x500 );
}
static void lcd_setup(void)
{
//mPORTDSetPinsDigitalOut(BIT_3);
//mPORTDClearBits(BIT_3);
mPORTDSetPinsDigitalOut( BIT_2 );
//Set backlight to open drain
mPORTDOpenDrainOpen( BIT_2 );
//Enable contrast control
OpenTimer2(T2_ON, LCD_PWMPERIOD);
OpenOC4( OC_ON | OC_TIMER_MODE16 | OC_TIMER2_SRC | OC_CONTINUE_PULSE | OC_LOW_HIGH , LCD_PWMPERIOD, 0x0458 );
//Start the timer for contrast/brightness PWM
//OpenTimer3(T3_ON | T3_PS_1_1 | T3_SOURCE_INT, LCD_PWMPERIOD);
//PR3 = LCD_PWMPERIOD - 1;
//OC3R = 0;
//mT3SetIntPriority(4);
//mT3ClearIntFlag();
//mT3IntEnable(1);
//SetDCOC3PWM(LCD_PWMPERIOD >> 2);
//SetDCOC3PWM(1);
//Enable brightness control
OpenOC3( OC_ON | OC_TIMER_MODE16 | OC_TIMER2_SRC | OC_CONTINUE_PULSE | OC_LOW_HIGH , LCD_PWMPERIOD, 0x500 );
// Open ENABLE line as output
LCD_EN_CLR();
PORT_DIR_OUT(LCD_EN_P, LCD_EN);
LCD_EN_CLR();
// Open RW and RS lines as output
LCD_RS_CLR();
PORT_CLR(LCD_RW_P, LCD_RW);
PORT_DIR_OUT(LCD_RS_P, LCD_RS);
PORT_DIR_OUT(LCD_RW_P, LCD_RW);
LCD_RS_CLR();
PORT_CLR(LCD_RW_P, LCD_RW);
// Set data lines as output
PORT_CLR(LCD_DATA_P, LCD_DATA_MASK);
PORT_DIR_OUT(LCD_DATA_P, LCD_DATA_MASK);
PORT_CLR(LCD_DATA_P, LCD_DATA_MASK);
// Wait for proper power up
task_delay(LCD_LONG_DELAY);
task_delay(LCD_LONG_DELAY);
task_delay(LCD_LONG_DELAY);
task_delay(LCD_LONG_DELAY);
// Wait for the LCD to power up correctly
lcd_command(LCD_FUNCTION_SET_CMD | LCD_FUNCTION_SET_8_BITS);
task_delay(LCD_SHORT_DELAY);
lcd_command(LCD_FUNCTION_SET_CMD | LCD_FUNCTION_SET_8_BITS);
task_delay(LCD_VERY_SHORT_DELAY);
lcd_command(LCD_FUNCTION_SET_CMD | LCD_FUNCTION_SET_8_BITS);
task_delay(LCD_VERY_SHORT_DELAY);
// Set up the LCD function
lcd_command(LCD_FUNCTION_SET_CMD | LCD_FUNCTION_SET_8_BITS | LCD_FUNCTION_SET_2_LINES);
task_delay(LCD_VERY_SHORT_DELAY);
// Turn the display on
lcd_command(LCD_DISPLAY_CTRL_CMD | LCD_DISPLAY_CTRL_CURSOR_ON | LCD_DISPLAY_CTRL_BLINK_ON);
task_delay(LCD_VERY_SHORT_DELAY);
// Clear the display
lcd_command(LCD_CLEAR_DISPLAY_CMD);
task_delay(LCD_SHORT_DELAY);
// Increase the cursor
lcd_command(LCD_ENTRY_MODE_CMD | LCD_ENTRY_MODE_INCREASE);
task_delay(LCD_SHORT_DELAY);
lcd_command(LCD_DISPLAY_CTRL_CMD | LCD_DISPLAY_CTRL_DISPLAY_ON);
task_delay(LCD_SHORT_DELAY);
}
