touchpanel.c

最常用的嵌入式LINUX字符设备驱动：触摸屏和小键盘驱动。触摸屏使用SPI接口

		flag = PEN_UP;
printk("collateflag = %d\n",collateflag);
		break;
	case 2:
		// 结束校验
		collateflag = 0;
		collatepos = 0;
		SCX = 320.0f / (float)(DX1 - DX);
		SCY = 240.0f / (float)(DY1 - DY);

		pre_pos.x = 160;
		pre_pos.y = 120;
		cur_pos.x = 160;
		cur_pos.y = 120;

/*		
		// 将DX,DY,SCX,SCY 保存到FLASH中
		save = kmalloc(LENGTH,GFP_KERNEL);
		if (NULL == save)
			break;
		p = save;
		*p++ = 'F';
		*p++ = 'L';
		*p++ = 'A';
		*p++ = 'S';
		*p++ = 'H';
		q = (unsigned char*)&DX;
		for (i=0;i<INTLEN;i++)
			*p++ = *q++;
		q = (unsigned char*)&DY;
		for (i=0;i<INTLEN;i++)
			*p++ = *q++;
		q = (unsigned char*)&SCX;
		for (i=0;i<FLOATLEN;i++)
			*p++ = *q++;
		q = (unsigned char*)&SCY;
		for (i=0;i<FLOATLEN;i++)
			*p++ = *q++;
		if (fwriteflash(FLASHBLKID,OFFSET,save,LENGTH))
			printk("write flash error!\n");
		else
		{
			printk("write flast -- DX = %d\n",DX);
			printk("write flast -- DY = %d\n",DY);
			printk("write flast -- SCX = %d\n",(unsigned int)(SCX*1000));
			printk("write flast -- SCY = %d\n",(unsigned int)(SCY*1000));
		}
		kfree(save);
*/
		break;
	case 3:
		// 进入手写输入
		collateflag = 2;
		writedelay = 0;
		flag = PEN_UP;
		keyflag = 0;
		// 关闭笔中断,打开时间中断
		memset(&pointbuf,0,sizeof(struct trackbuf));
		sendtrack = 1;

		printk("enable the time interrupt!\n");
		cli();
	
		disable_irq(17|0x10000000);
		// Set the irq6 bit to the input port	
		PDDIR = PDDIR & 0xdf;//0x7f;	
		PDSEL = PDSEL | 0x20;//0x80;
	
		enable_irq(5|0x10000000);
		*((unsigned short*)0xfffff610) = 0x0019;
		*((unsigned short*)0xFFFFF61A) = 0;
	
		sti();
		break;
	case 4:
		// 退出手写输入
		collateflag = 0;
		memcpy(videobuf,videobackup,VIDEOLEN);

		printk("disable the time interrupt!\n");

		// 关闭时间中断,打开笔中断
		cli();
		disable_irq(5|0x10000000);
		*((unsigned short*)0xfffff610) = 0x0018;

		enable_irq(17|0x10000000);
		PDSEL = PDSEL & 0xdf;
		sti();
		break;
	case 5:
		// 送手写轨迹给应用程序
		pbuf = (struct trackbuf*)arg;
		if (resourchflag == 1)
		{
			pbuf->flag = 1;
			break;
		}
		resourchflag = 1;
		if (pointbuf.flag == 1)
		{
			memcpy(pbuf->track,pointbuf.track,20000);
			pbuf->endpos = pointbuf.endpos;
			pbuf->pointcount = pointbuf.pointcount;
			pbuf->flag = pointbuf.flag;
			memset(&pointbuf,0,sizeof(struct trackbuf));
			memcpy(videobuf,videobackup,VIDEOLEN);
		}
		else
		{
			// 如果一个字的轨迹还未结束,则不返回
			pbuf->flag = 0;
		}
		resourchflag = 0;
		break;
	case 6:
		// 设置手写键盘的参数(位置信息)
		prect = (struct keyboard*)arg;
		boardrect.x = prect->x;
		boardrect.y = prect->y;
		boardrect.x1 = prect->x1;
		boardrect.y1 = prect->y1;
		break;
	case 7:
		// Save the LCD interface
		memcpy(videobackup,videobuf,VIDEOLEN);
		break;
	case 8:
		// resume the LCD interface
		memcpy(videobuf,videobackup,VIDEOLEN);
		break;
	}
	return 1;
}

struct file_operations touch_fops = 
{
	NULL,
	touch_read,
	NULL,
	NULL,
	touch_select,
	touch_ioctl,
	NULL,
	touch_open,
	touch_close,
	NULL,
	NULL,
	NULL,
	NULL
};


/************************************************************
函数原型: void Get_Coordinate(int* xpos, int* ypos);
功    能: this function communicate with ADS7846 and get the touch
		panel data.
输入参数: int* xpos:the x value.
	  int* ypos:the y value.
返 回 值: return NULL.
************************************************************/
int Get_Coordinate()
{

	PFDATA = PFDATA & 0xfe;    	//Select ADS7846 CS = 0;
	SPIMCONT = SPIMCONT | 0x0200;	//0x0200;

	// get the 1st coordinate
	SPIMDATA = 0xd3;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);

	SPIMDATA = 0x80;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);
	filter.y[0]=(SPIMDATA & 0x0fff);

	SPIMDATA = 0x93;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);

	SPIMDATA = 0x80;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);
	filter.x[0]=(SPIMDATA & 0x0fff);

	// get the 2nd coordinate
	SPIMDATA = 0xd3;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);

	SPIMDATA = 0x80;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);
	filter.y[1]=(SPIMDATA & 0x0fff);

	SPIMDATA = 0x93;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);

	SPIMDATA = 0x80;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);
	filter.x[1]=(SPIMDATA & 0x0fff);

	// get the 3rd coordinate
	SPIMDATA = 0xd3;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);

	SPIMDATA = 0x80;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);
	filter.y[2]=(SPIMDATA & 0x0fff);

	SPIMDATA = 0x93;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);

	SPIMDATA = 0x80;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);
	filter.x[2]=(SPIMDATA & 0x0fff);

	// get the 4th coordinate
/*	SPIMDATA = 0xd3;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);

	SPIMDATA = 0x80;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);
	filter.y[3]=(SPIMDATA & 0x0fff);

	SPIMDATA = 0x93;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);

	SPIMDATA = 0x80;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);
	filter.x[3]=(SPIMDATA & 0x0fff);

	// get the 5th coordinate
	SPIMDATA = 0xd3;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);

	SPIMDATA = 0x80;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);
	filter.y[4]=(SPIMDATA & 0x0fff);

	SPIMDATA = 0x93;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);

	SPIMDATA = 0x80;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);
	filter.x[4]=(SPIMDATA & 0x0fff);
*/
	//
	SPIMDATA = 0x80;
	SPIMCONT = SPIMCONT | 0x0100;
	while(SPIMCONT & 0x0100);
	
	PFDATA = PFDATA | 0x01;		//ADS7846 CS = 1
	SPIMCONT = SPIMCONT & 0xfdff;

	return 0;
}


// [Added++] by Aavan, 2002/09/04
/*int
GetMidVal(int *pnVals, short sCount)
{
	int tempVal;
	short i, j, max;

	for (i = 0; i < 3; i++) {
		max = i;
		for (j = i; j < sCount; j++) {
			if (pnVals[j] > pnVals[max])
				max = j;
		}

		if (max != i) {
			tempVal = pnVals[max];
			pnVals[max] = pnVals[i];
			pnVals[i] = tempVal;
		}
	}

	return (pnVals[(sCount >> 1) + (sCount & 1)]);
}
*/
int
GetMidVal(int val1, int val2, int val3, int ref)
{
	int r1, r2, r3;

	r1 = (val1 > ref ? val1 - ref : ref - val1);
	r2 = (val2 > ref ? val2 - ref : ref - val2);
	r3 = (val3 > ref ? val3 - ref : ref - val3);

	if (r1 <= r2 && r1 <= r3)
		return (val1);
	else if (r3 <= r1 && r3 <= r2)
		return (val3);
	else
		return (val2);
}
// [Added--]


static int x,y;
static float fx,fy;
static int xtmp,ytmp; //,i;

/************************************************************
函数原型: void touch_irq_handler(int irq, void* dev_id, struct pt_regs* regs);
功    能: this function process the pen interrupt(when pen down).
输入参数: all arguments not used.
返 回 值: return NULL.
************************************************************/
void touch_irq_handler(int irq, void* dev_id, struct pt_regs* regs)
{
	cli();

	disable_irq(17|0x10000000);
	// Set the irq6 bit to the input port	
	PDDIR = PDDIR & 0xdf;//0x7f;	
	PDSEL = PDSEL | 0x20;//0x80;

	enable_irq(5|0x10000000);
	*((unsigned short*)0xfffff610) = 0x0019;	//Enable Timer2 Added by zhangjz
	*((unsigned short*)0xFFFFF61A) = 0;

	//pen down
	//	cli();
		Get_Coordinate();
		sti();

		gX = GetMidVal(filter.x[0], filter.x[1], filter.x[2], gOldX);
		gY = GetMidVal(filter.y[0], filter.y[1], filter.y[2], gOldY);
		gOldX = gX;
		gOldY = gY;

//	sti();
}

//static int sx,sy;
/************************************************************