lcd.c

MG64+VS1003+SDCARD+nokia5110 之多的MP3

/*****************************************************/
/*            File name : LCD.c                                                   */
/* Description : Code  for Nokia 3310LCD, display IC:PCD8544  */
/* Platform     : AVRStudio4.13 + WinAVR20070525  for AVR     */
/* Author       : Michael Zhang - 章其波                            */
/* Email         : [e-mail]                                          */
/* MSN          : [e-mail]                          */
/* Date          : 2007-10-21                                                    */
/* NOT FOR COMMERCIAL USE,     ALL RIGHT RESERVED!         */
/*****************************************************/
/* Change Log:                                                                      */
/*                   20071122: fix a bug for some 3310lcd will not work with display function */
/*                   20071021: original version                                 */
/*****************************************************/


#include"LCD.h"

/********************  IO utilities ***************************/
#define LCD_RS_H  LCD_RS_PORT |=   1<<LCD_RS_BIT
#define LCD_RS_L  LCD_RS_PORT &= ~(1<<LCD_RS_BIT)

#define LCD_E_H  LCD_E_PORT |=   1<<LCD_E_BIT
#define LCD_E_L  LCD_E_PORT &= ~(1<<LCD_E_BIT)

#define LCD_RST_H  LCD_RST_PORT |=   1<<LCD_RST_BIT
#define LCD_RST_L  LCD_RST_PORT &= ~(1<<LCD_RST_BIT)

#define LCD_SCK_H  LCD_SCK_PORT |=   1<<LCD_SCK_BIT
#define LCD_SCK_L  LCD_SCK_PORT &= ~(1<<LCD_SCK_BIT)

#define LCD_MOSI_H  LCD_MOSI_PORT |=   1<<LCD_MOSI_BIT
#define LCD_MOSI_L  LCD_MOSI_PORT &= ~(1<<LCD_MOSI_BIT)

#define PORT_INI {				\
					LCD_RS_H;	\
					LCD_E_H;	\
					LCD_RST_H;	\
					LCD_SCK_H;	\
					LCD_MOSI_H;	\
					LCD_RS_DDR |= 1<<LCD_RS_BIT;	\
					LCD_E_DDR |= 1<<LCD_E_BIT;	\
					LCD_RST_DDR |= 1<<LCD_RST_BIT;	\
					LCD_SCK_DDR |= 1<<LCD_SCK_BIT;	\
					LCD_MOSI_DDR |= 1<<LCD_MOSI_BIT;	\
				}
/**************************************************************/



/*********** Display buffer in SRAM ************/
unsigned char disBuf[504];





#if HW_SPI
/*********************** Hardware SPI Speed Set **************/
void lcdSpiSpeedSet(void)
{
	SPCR =  (1<<SPE) | (1<<MSTR);

#if (F_CPU>8000000)
	SPSR &= ~(1<<SPI2X);  /* 1/4 F_CPU */
#else
	SPSR |= 1<<SPI2X;     /* 1/2 F_CPU */
#endif
}
/************************ Hardware SPI Speed set End *********/
#endif


/************************ SPI write a byte *********************/
void lcdWriteByte(unsigned char val)
{
	//LCD_E_L;
	
#if HW_SPI				/* Use Hardware SPI */
	SPDR = val;
	while(!(SPSR & (1<<SPIF)));	/* Wait transfer end */	
#else					/* Use common GPIO to simulate the timing*/
	unsigned char i = 8;
	while(i--)
	{
		LCD_SCK_L;
		if(val&0x80)LCD_MOSI_H;	/* MSB first */
		else LCD_MOSI_L;
		LCD_SCK_H;
		val <<= 1;				/* Data shift */
	}
#endif

	//LCD_E_H;
}
/***************************************************************/

/************************ SPI write a command *********************/
void lcdWriteCmd(unsigned char val)
{
	//LCD_E_L;
	LCD_RS_L;
	
#if HW_SPI				/* Use Hardware SPI */
	SPDR = val;
	while(!(SPSR & (1<<SPIF)));	/* Wait transfer end */	
#else					/* Use common GPIO to simulate the timing*/
	unsigned char i = 8;
	while(i--)
	{
		LCD_SCK_L;
		if(val&0x80)LCD_MOSI_H;	/* MSB first */
		else LCD_MOSI_L;
		LCD_SCK_H;
		val <<= 1;				/* Data shift */
	}
#endif

	LCD_RS_H;
	//LCD_E_H;
}
/***************************************************************/


/***************** LCD initialization *****************************/
void lcdInit(void)
{
	PORT_INI;		/* IO port initialization*/

#if HW_SPI			/* If hardware SPI is used, adjust the SPI speed */
	//lcdSpiSpeedSet();
	SPCR =  (1<<SPE) | (1<<MSTR)|(1<<SPR0)|(1<<SPR1);
	SPSR &= ~(1<<SPI2X);  /* 1/4 F_CPU */
#endif	

	lcdClrDisBuf();	/* clear display buffer: not the lcd internal buffer */

	_delay_ms(15);	/*MAX F_CPU should below than 16MHz*/
	_delay_ms(15);
	_delay_ms(15);
	_delay_ms(15);
	_delay_ms(15);
	_delay_ms(15);
	_delay_ms(15);
	_delay_ms(15);

	LCD_RST_L;		/* Reset LCD */
	_delay_ms(2);
	_delay_ms(2);
	LCD_RST_H;

	_delay_us(40);	/* Short Delay */

	LCD_E_L;		/* Enable LCD: CS = 0 */

	lcdWriteCmd(0x21);	/* Expanted Instuction, Set H = 1 */
	lcdWriteCmd(0xc8);	/* Set bias voltage */
	lcdWriteCmd(0x06);	/* Set temperature */
	lcdWriteCmd(0x13);	/* Set 1/48 cycle*/
	lcdWriteCmd(0x20);	/* Normal Insturction, Set H = 0 */
	lcdWriteCmd(0x0c);	/* Display control, Normal mode*/

	lcdUpdateDisplay();	/* Update display */

	LCD_E_H;		/* Disable LCD: CS =1 */
}


/******** Clear the display buffer, external buffer in mico's SRAM ***************/
void lcdClrDisBuf(void)
{
	unsigned int n = 504;
	unsigned char * p = disBuf;
	while(n--)*p++ = 0x00;
}

/** Update the display, actually transfer the data of the SRAM to LCD through SPI ****/
void lcdUpdateDisplay(void)
{
	//unsigned int n = 504;
	unsigned char * p = disBuf;
	unsigned int i,j;

#if HW_SPI			/* If hardware SPI is used, adjust the SPI speed*/
	lcdSpiSpeedSet();	/* Other SPI device may share the SPI & they may change the speed */
#endif

	LCD_E_L;		/* Chip select */

/***************************************************************************/
/*** It seems that some 3310lcd do not support the following code  ****/

 	//lcdWriteCmd(0x0c);
	//lcdWriteCmd(0x40 | 0);	/* Set row to 0 */
  	//lcdWriteCmd(0x80 | 0);	/* Set column to 0*/
							/* To make sure the data always start at codinate(0,0) */
	//while(n--)
	//	lcdWriteByte(*p++);
/***************************************************************************/

/* so we use this, set the address at each row */	
	for(i=0;i<6;i++)
	{
		lcdWriteCmd(0x40 | i);	/* Set row to 0 */
 	 	lcdWriteCmd(0x80 | 0);	/* Set column to 0*/
		for(j=0;j<84;j++)
		{
			lcdWriteByte(*p++);
		}
	}
	LCD_E_H;		/* chip deselect */
}



/*********** Set a pixel bit with value val *************************/
void OnePixel(unsigned char x,unsigned char y,unsigned char val)
{
	unsigned char *p = &disBuf[ (unsigned int)y/8*84 + x ];//找到对应字节
	if(val)*p |= (1<<(y%8));		//修改对应位
	else *p &= ~(1<<(y%8));
}
/**********  Read the pixel value withe the given codination ************/
unsigned char ReadPixel(unsigned char x,unsigned char y)
{
	unsigned char *p = &disBuf[ (unsigned int)y/8*84 + x ];//找到对应字节
	if(*p & (1<<(y%8)))return 1;
	else return 0;
}

/*  demo program
int main()
{
	lcdInit();
	onePixel(10,10,1);
	lcdUpdateDisplay();
	while(1);
}*/

/*  This is the end of LCD.c   */