#include "target.h"


/*
	HT1621.c--low level driver for HT1621 or
	other Lcd driver chip.
	version 1.0.1,Jun 28th,2003
	
	Copyright (C) 2002-2003 Mcu Life Co.Ltd.
	Designed by Victor.li,If you have anyquestion,please connect me by follow:
	http://yiyun2000.myrice.com
	email:yunhongli@21cn.com
*/

/*
	BIAS & COM 1 0 0 0 0 1 0 a b X c X
	c=0: 1/2 bias option
	c=1: 1/3 bias option
	ab=00: 2 commons option
	ab=01: 3 commons option
	ab=10: 4 commons option
*/

#define BIAS_1_3						0x52

#define READ_COMMAND				0X180
#define WRITE_COMMAND				0X140
#define READ_MODIFIED_WRITE_COMMAND		0X140
#define LCD_COMMAND				0X0800

enum{
	DIS_LCD = 0x0000,	//Turn off both system oscillator and LCD bias generator
	EN_LCD = 0x0002,	//Turn on system oscillator
	OFF_LCD = 0x0004,	//Turn off LCD display
	ON_LCD = 0x0006,	//Turn on LCD display
	TIMER_DIS_LCD = 0x0008,	//Disable time base output
	DIS_WDT_LCD = 0x000A,	//Disable WDT time-out flag output
	TIMER_EN_LCD = 0x000C,	//Enable time base output
	EN_WDT_LCD = 0x000E,	//Enable WDT time-out flag output
	TONE_OFF_LCD = 0x0010,	//Turn off Tone output
	TIMER_LCD = 0x001A,	//Clear the contents of the time base generator
	WDT_LCD = 0x001E,	//Clear the contents of WDT stage
	RC_32K_LCD = 0x0030,	//System clock source,on-chip RC oscillator
	EXT_32K_LCD = 0x0038,	//System clock source,external clock source
	TONE_4K_LCD = 0x0080,	//Tone frequency output:4kHz
	TONE_2K_LCD = 0x00C0,	//Tone frequency output:2kHz
	IRQ_DIS_LCD = 0x0100,	//Disable IRQ output
	IRQ_EN_LCD = 0x0110	//Enable IRQ output
};


#define Set_Lcd_CS()				Set_P1_7()
#define Clr_Lcd_CS()				Clr_P1_7()
#define Set_Lcd_WR()				Set_P1_6()
#define Clr_Lcd_WR()				Clr_P1_6()
#define Set_Lcd_DATA()				Set_P1_5()
#define Clr_Lcd_DATA()				Clr_P1_5()

//define for lcd delay time,it should
#define LCD_DELAY_COUNT				3

unsigned short code LcdMask[16] = {
	0x01,0x02,0x04,0x08,
	0x10,0x20,0x40,0x80,
	0x100,0x200,0x400,0x800,
	0x1000,0x2000,0x4000,0x8000
};

void LcdDelay()
{
	char i;
	for(i=0;i<LCD_DELAY_COUNT;i++);
}

void SendLcdBits(unsigned int com,unsigned char bitsnum)
{
	char i;
	for(i=bitsnum-1;i>=0;i--){
		Clr_Lcd_WR();
		LcdDelay();
		if(com&LcdMask[i])
			Set_Lcd_DATA();
		else
			Clr_Lcd_DATA();
		LcdDelay();
		Set_Lcd_WR();
		LcdDelay();
	}
}

void SendLcdSegData(unsigned char lcddata,unsigned char bitsnum)
{
	unsigned char i;
	for(i=0;i<bitsnum;i++){
		Clr_Lcd_WR();
		LcdDelay();
		if(lcddata&(unsigned char)(LcdMask[i]))
			Set_Lcd_DATA();
		else
			Clr_Lcd_DATA();
		LcdDelay();
		Set_Lcd_WR();
		LcdDelay();
	}
}


void SendLcdCommand(unsigned int com)
{
	Set_Lcd_CS();
	Set_Lcd_WR();
	Set_Lcd_DATA();

	Clr_Lcd_CS();
	LcdDelay();
	SendLcdBits(((com&0x1ff)|LCD_COMMAND),12);
	Set_Lcd_CS();
}


void WriteLcdData(unsigned char addr,unsigned char ucdata)
{
	unsigned int command;
	addr <<= 1;
	command = (addr&0x3f)|WRITE_COMMAND;

	Clr_Lcd_CS();
	LcdDelay();
	SendLcdBits(command,9);
	SendLcdSegData(ucdata,8);
	Set_Lcd_CS();
}

void InitHT1621()
{
	SendLcdCommand(ON_LCD);
	SendLcdCommand(EN_LCD);
	SendLcdCommand(BIAS_1_3);
}

void SetHT1621()
{
	Set_Lcd_CS();
	Set_Lcd_WR();
	Set_Lcd_DATA();
}

void ClrHT1621()
{
	Clr_Lcd_CS();
	Clr_Lcd_WR();
	Clr_Lcd_DATA();	
}