static void lcd_command(char command)
{
// Clear RS to indicate 'command'
LCD_RS_CLR();
lcd_write_byte(command);
task_delay(LCD_VERY_SHORT_DELAY);
}
static int LcdInit(NUTDEVICE * dev)
{
LCD_RS_CLR();
LCD_RW_CLR();
LcdClrBits(LCD_DATA);
NutMicroDelay(30);
LCD_EN_CLR();
NutMicroDelay(30);
NutSleep(18);
/* This initialization will make sure, that the LCD is switched
* to 8-bit mode, no matter which mode we start from or we finally
* need.
*/
LcdWriteCmd(_BV(LCD_FUNCTION) | _BV(LCD_FUNCTION_8BIT));
NutSleep(16);
LcdWriteCmd(_BV(LCD_FUNCTION) | _BV(LCD_FUNCTION_8BIT));
NutSleep(4);
LcdWriteCmd(_BV(LCD_FUNCTION) | _BV(LCD_FUNCTION_8BIT));
NutSleep(2);
LcdWriteInstruction((_BV(LCD_FUNCTION)) | (_BV(LCD_FUNCTION_8BIT)) | (_BV(LCD_EXT)) , LCD_SHORT_DELAY);
/* Switch display and cursor off. */
LcdWriteNibble(_BV(LCD_ON_CTRL) >> 4);
LcdWriteNibble(_BV(LCD_ON_CTRL));
NutSleep(2);
/* Clear display. */
LcdClear();
/* Set entry mode. */
LcdWriteCmd(_BV(LCD_ENTRY_MODE) | _BV(LCD_ENTRY_INC));
/* Switch display on. */
LcdWriteCmd(_BV(LCD_ON_CTRL) | _BV(LCD_ON_DISPLAY));
/* Move cursor home. */
LcdCursorHome();
/* Set data address to zero. */
LcdWriteCmd(_BV(LCD_DDRAM));
return 0;
}
/*!
* \brief Send command byte to LCD controller.
*
* \param cmd Byte to send.
*/
static void LcdWriteCmd(uint8_t cmd)
{
/* RS low selects instruction register. */
LCD_RS_CLR();
LcdWriteByte(cmd);
}
static int LcdInit(NUTDEVICE * dev)
{
#if defined(PMC_PCER)
outr(PMC_PCER, _BV(LCD_RS_PIO_ID) | _BV(LCD_EN_PIO_ID));
#endif
/* Initialize GPIO lines. */
#ifdef LCD_RW_BIT
outr(PMC_PCER, _BV(LCD_RW_PIO_ID));
LCD_RW_CLR();
#endif
#ifdef LCD_EN2_BIT
outr(PMC_PCER, _BV(LCD_EN2_PIO_ID));
LCD_EN2_CLR();
#endif
#ifdef LCD_RST_BIT
outr(PMC_PCER, _BV(LCD_RST_PIO_ID));
LCD_RST_CLR();
#endif
LCD_RS_CLR();
LCD_RW_CLR();
LcdClrBits(LCD_DATA);
NutMicroDelay(30);
LCD_EN_CLR();
NutMicroDelay(30);
/* Initial delay. Actually only required after power on. */
NutSleep(16);
/* This initialization will make sure, that the LCD is switched
* to 8-bit mode, no matter which mode we start from or we finally
* need.
*/
LcdWriteNibble((_BV(LCD_FUNCTION) | _BV(LCD_FUNCTION_8BIT)) >> 4);
NutSleep(15);
LcdWriteNibble((_BV(LCD_FUNCTION) | _BV(LCD_FUNCTION_8BIT)) >> 4);
NutSleep(4);
LcdWriteNibble((_BV(LCD_FUNCTION) | _BV(LCD_FUNCTION_8BIT)) >> 4);
NutSleep(2);
#ifdef LCD_IF_4BIT
/* We now switch to 4-bit mode */
LcdWriteNibble(_BV(LCD_FUNCTION) >> 4);
NutSleep(2);
// TODO: Add support for large font in single line displays
/* Set number of lines and font. Can't be changed later. */
#if (LCD_ROWS == 2) || (LCD_ROWS==4)
LcdWriteNibble((_BV(LCD_FUNCTION) | _BV(LCD_FUNCTION_2LINES)) >> 4);
LcdWriteNibble(_BV(LCD_FUNCTION) | _BV(LCD_FUNCTION_2LINES));
#else
LcdWriteNibble(_BV(LCD_FUNCTION) >> 4);
LcdWriteNibble(_BV(LCD_FUNCTION) );
#endif
#else /* LCD_IF_4BIT */
LcdWriteCmd(_BV(LCD_FUNCTION) | _BV(LCD_FUNCTION_8BIT));
#endif /* LCD_IF_4BIT */
NutSleep(2);
/* Switch display and cursor off. */
LcdWriteNibble(_BV(LCD_ON_CTRL) >> 4);
LcdWriteNibble(_BV(LCD_ON_CTRL));
NutSleep(2);
/* Clear display. */
LcdClear();
/* Set entry mode. */
LcdWriteCmd(_BV(LCD_ENTRY_MODE) | _BV(LCD_ENTRY_INC));
/* Switch display on. */
LcdWriteCmd(_BV(LCD_ON_CTRL) | _BV(LCD_ON_DISPLAY));
/* Move cursor home. */
LcdCursorHome();
/* Set data address to zero. */
LcdWriteCmd(_BV(LCD_DDRAM));
return 0;
}
/*!
* \brief Read status byte from LCD controller.
*/
static unsigned int LcdReadStatus(void)
{
/* RS low selects status register. */
LCD_RS_CLR();
return LcdReadByte();
}
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);
}
