/*************************************************************************
Initialize display and select type of cursor
Input: dispAttr LCD_DISP_OFF display off
LCD_DISP_ON display on, cursor off
LCD_DISP_ON_CURSOR display on, cursor on
LCD_DISP_CURSOR_BLINK display on, cursor on flashing
Returns: none
*************************************************************************/
void lcd_init(uint8_t dispAttr)
{
#if LCD_PCF8574_INIT == 1
//init pcf8574
pcf8574_init();
#endif
#if LCD_LED == 1
lcd_led(1);
#endif
dataport = 0;
pcf8574_setoutput(LCD_PCF8574_DEVICEID, dataport);
delay(16000); /* wait 16ms or more after power-on */
/* initial write to lcd is 8bit */
// dataport |= _BV(LCD_DATA1_PIN); // _BV(LCD_FUNCTION)>>4;
// dataport |= _BV(LCD_DATA0_PIN); // _BV(LCD_FUNCTION_8BIT)>>4;
// lcd_e_toggle();
// delay(4992); /* delay, busy flag can't be checked here */
/* repeat last command */
// lcd_e_toggle();
//delay(64); /* delay, busy flag can't be checked here */
// delay(4992); /* delay, busy flag can't be checked here */
/* repeat last command a third time */
// lcd_e_toggle();
//delay(64); /* delay, busy flag can't be checked here */
// delay(4992); /* delay, busy flag can't be checked here */
/* now configure for 4bit mode */
//dataport &= ~_BV(LCD_DATA0_PIN);
dataport |= _BV(LCD_DATA1_PIN);
lcd_e_toggle();
delay(128); /* some displays need this additional delay */
lcd_e_toggle();
delay(128);
dataport &= ~_BV(LCD_DATA1_PIN);
dataport |= _BV(LCD_DATA3_PIN);
lcd_e_toggle();
delay(128);
/* from now the LCD only accepts 4 bit I/O, we can use lcd_command() */
lcd_command(LCD_FUNCTION_DEFAULT); /* function set: display lines */
// lcd_command(LCD_DISP_OFF); /* display off */
lcd_clrscr(); /* display clear */
lcd_command(LCD_MODE_DEFAULT); /* set entry mode */
lcd_command(dispAttr); /* display/cursor control */
}/* lcd_init */
/*************************************************************************
Low-level function to write byte to LCD controller
Input: data byte to write to LCD
rs 1: write data
0: write instruction
Returns: none
*************************************************************************/
static void lcd_write(uint8_t data,uint8_t rs)
{
if (rs) /* write data (RS=1, RW=0) */
dataport |= _BV(LCD_RS_PIN);
else /* write instruction (RS=0, RW=0) */
dataport &= ~_BV(LCD_RS_PIN);
dataport &= ~_BV(LCD_RW_PIN);
/* output high nibble first */
dataport &= ~_BV(LCD_DATA3_PIN);
dataport &= ~_BV(LCD_DATA2_PIN);
dataport &= ~_BV(LCD_DATA1_PIN);
dataport &= ~_BV(LCD_DATA0_PIN);
if(data & 0x80) dataport |= _BV(LCD_DATA3_PIN);
if(data & 0x40) dataport |= _BV(LCD_DATA2_PIN);
if(data & 0x20) dataport |= _BV(LCD_DATA1_PIN);
if(data & 0x10) dataport |= _BV(LCD_DATA0_PIN);
lcd_e_toggle();
/* output low nibble */
dataport &= ~_BV(LCD_DATA3_PIN);
dataport &= ~_BV(LCD_DATA2_PIN);
dataport &= ~_BV(LCD_DATA1_PIN);
dataport &= ~_BV(LCD_DATA0_PIN);
if(data & 0x08) dataport |= _BV(LCD_DATA3_PIN);
if(data & 0x04) dataport |= _BV(LCD_DATA2_PIN);
if(data & 0x02) dataport |= _BV(LCD_DATA1_PIN);
if(data & 0x01) dataport |= _BV(LCD_DATA0_PIN);
lcd_e_toggle();
/* all data pins high (inactive) */
dataport |= _BV(LCD_DATA0_PIN);
dataport |= _BV(LCD_DATA1_PIN);
dataport |= _BV(LCD_DATA2_PIN);
dataport |= _BV(LCD_DATA3_PIN);
delay(128);
pcf8574_setoutput(LCD_PCF8574_DEVICEID, dataport);
delay(128);
}
void lcd_write(uint8_t data, uint8_t rs) {
__IO uint8_t outputdata;
if(rs) { //write data
lcd_rs_high();
} else { //write instruction
lcd_rs_low();
}
lcd_rw_low(); //set to write
//set data pins to output
GPIO_InitStructure.GPIO_Pin = DATA_PORT_Pin_0 | DATA_PORT_Pin_1 |
DATA_PORT_Pin_2 | DATA_PORT_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_Init(LCD_PORT, &GPIO_InitStructure);
/**
* Preserve the RS,RW,E bits in order to write out:
* our data goe son the 4 most significant bits with
* the high nibble output first.
*/
outputdata = (uint8_t)GPIO_ReadOutputData(LCD_PORT);
outputdata &= 0x05; //we're only interested in the lower bits (RS,RW,E)
//output high nibble first
GPIO_Write(LCD_PORT, outputdata | (data & 0xF0));
//push data
lcd_e_toggle();
GPIO_Write(LCD_PORT, outputdata | ((data << 4) & 0xF0));
//push data
lcd_e_toggle();
GPIO_Write(LCD_PORT, outputdata | 0xF0); //set pins high as inactive state
}
void lcd_init(uint8_t dispAttr) {
//__IO uint8_t outputdata; //holds whatever is on the port
/* a few things will happen here so the
* students won't need to do them:
* - configuration of the "LCD port"
* defined in the defines as PORT D
* - initializing the LCD
*/
/* we want to initialize delays that will enable
* to delay by microseconds
*/
//if (SysTick_Config(SystemCoreClock/1000000))
//{
/* Capture error */
// while (1);
//}
//SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
/** configure the "LCD port" **/
/* "LCD PORT" Periph clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_LCD_PORT, ENABLE);
/* Configure:
* pin 0,1,2 for output: (RS,RW,E)
* pin 4,5,6,7 for data output: DB11-DB14 in 4-bit mode
*/
//first set output...
GPIO_InitStructure.GPIO_Pin = RS_PORT_Pin | RW_PORT_Pin |
E_PORT_Pin |
DATA_PORT_Pin_0 | DATA_PORT_Pin_1 |
DATA_PORT_Pin_2 | DATA_PORT_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(LCD_PORT, &GPIO_InitStructure);
/** //...then input pin
GPIO_InitStructure.GPIO_Pin = DB7_PORT_Pin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_Init(LCD_PORT, &GPIO_InitStructure); **/
/** this ends the configuration of the "LCD PORT" **/
//outputdata = (uint8_t)GPIO_ReadOutputData(LCD_PORT);
//outputdata &= 0x05; //we're only interested in the lower bits (RS,RW,E)
Delay(50000);
/** initialize the LCD display by software instruction **/
GPIO_Write(LCD_PORT, (1<<LCD_DATA0_PIN) | (1<<LCD_DATA1_PIN));
//enable writing to LCD
lcd_e_toggle();
Delay(5000);
lcd_e_toggle();
Delay(5000);
lcd_e_toggle();
//lcd_waitbusy();
Delay(160);
//configure for 4-bit mode
GPIO_Write(LCD_PORT, 1<<LCD_DATA1_PIN);
lcd_e_toggle();
Delay(160);
lcd_command(LCD_FUNCTION_4BIT_2LINES); /* function set: display lines */
lcd_command(LCD_DISP_OFF); /* display off */
lcd_clrscr(); /* display clear */
lcd_command(LCD_MODE_DEFAULT); /* set entry mode */
/** end initialize the LCD **/
lcd_command(dispAttr);
}
