📄 touchpanel.c

📁 uCOSII_lwip_lpc1768
💻 C
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/****************************************Copyright (c)****************************************************
**                                      
**                                 http://www.powermcu.com
**
**--------------File Info---------------------------------------------------------------------------------
** File name:               TouchPanel.c
** Descriptions:            The TouchPanel application function
**
**--------------------------------------------------------------------------------------------------------
** Created by:              AVRman
** Created date:            2010-11-7
** Version:                 v1.0
** Descriptions:            The original version
**
**--------------------------------------------------------------------------------------------------------
** Modified by:             
** Modified date:           
** Version:                 
** Descriptions:            
**
*********************************************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include <includes.h>


/* Private variables ---------------------------------------------------------*/
Matrix matrix ;Coordinate  display ;

/* DisplaySample LCD坐标上对应的ads7843采样AD值 如：LCD 坐标45,45 应该的X Y采样ADC分别为3388,920 */	
Coordinate ScreenSample[3];/* LCD上的坐标 */Coordinate DisplaySample[3] =   {                                            { 120,50 },											{ 30, 200},                                            { 290,190}	                            } ;

/* Private define ------------------------------------------------------------*/
#define THRESHOLD 2   /* 差值门限 */


/*******************************************************************************
* Function Name  : LPC17xx_SPI_SetSpeed
* Description    : Set clock speed to desired value
* Input          : - speed: speed
* Output         : None
* Return         : None
* Attention		 : None
*******************************************************************************/
void LPC17xx_SPI_SetSpeed (uint8_t speed)
{
	speed &= 0xFE;
	if ( speed < 2  ) {
		speed = 2 ;
	}
	LPC_SSP1->CPSR = speed;
}

/*******************************************************************************
* Function Name  : ADS7843_SPI_Init
* Description    : ADS7843 SPI 初始化
* Input          : None
* Output         : None
* Return         : None
* Attention		 : None
*******************************************************************************/
static void ADS7843_SPI_Init(void) 
{ 
	volatile uint32_t dummy;

	/* Initialize and enable the SSP1 Interface module. */
	LPC_SC->PCONP |= (1 << 10);          /* Enable power to SSPI1 block  */

	/* P0.7 SCK, P0.8 MISO, P0.9 MOSI are SSP pins. */
	LPC_PINCON->PINSEL0 &= ~((3UL<<14) | (3UL<<16) | (3UL<<18)) ; /* P0.7,P0.8,P0.9 cleared */
	LPC_PINCON->PINSEL0 |=  (2UL<<14) | (2UL<<16) | (2UL<<18);    /* P0.7 SCK1,P0.8 MISO1,P0.9 MOSI1 */

	/* PCLK_SSP1=CCLK */
	LPC_SC->PCLKSEL0 &= ~(3<<20);               /* PCLKSP0 = CCLK/4 (18MHz) */
	LPC_SC->PCLKSEL0 |=  (1<<20);               /* PCLKSP0 = CCLK   (72MHz) */

	LPC_SSP1->CR0  = 0x0007;                    /* 8Bit, CPOL=0, CPHA=0         */
	LPC_SSP1->CR1  = 0x0002;                    /* SSP1 enable, master          */

	LPC17xx_SPI_SetSpeed ( SPI_SPEED_2MHz );

	/* wait for busy gone */
	while( LPC_SSP1->SR & ( 1 << SSPSR_BSY ) );

	/* drain SPI RX FIFO */
	while( LPC_SSP1->SR & ( 1 << SSPSR_RNE ) )
	{
		dummy = LPC_SSP1->DR;
	}
} 

/*******************************************************************************
* Function Name  : TP_Init
* Description    : ADS7843端口初始化
* Input          : None
* Output         : None
* Return         : None
* Attention		 : None
*******************************************************************************/
void TP_Init(void) 
{ 
  LPC_GPIO0->FIODIR |=  (1<<6);   /* P0.6 CS is output */
  LPC_GPIO2->FIODIR |=  (0<<13);  /* P2.13 TP_INT is input */
  TP_CS(1); 
  ADS7843_SPI_Init(); 
} 

/*******************************************************************************
* Function Name  : DelayUS
* Description    : 延时1us
* Input          : - cnt: 延时值
* Output         : None
* Return         : None
* Attention		 : None
*******************************************************************************/
static void DelayUS(uint16_t cnt)
{
  uint16_t i;
  for(i = 0;i<cnt;i++)
  {
     uint8_t us = 12; /* 设置值为12，大约延1微秒 */    
     while (us--)     /* 延1微秒	*/
     {
       ;   
     }
  }
}


/*******************************************************************************
* Function Name  : WR_CMD
* Description    : 向 ADS7843写数据
* Input          : - cmd: 传输的数据
* Output         : None
* Return         : None
* Attention		 : None
*******************************************************************************/
static uint8_t WR_CMD (uint8_t cmd)  
{ 
  uint8_t byte_r;

  while (LPC_SSP1->SR & (1 << SSPSR_BSY) ); 	     /* Wait for transfer to finish */
  LPC_SSP1->DR = cmd;
  while (LPC_SSP1->SR & (1 << SSPSR_BSY) ); 	     /* Wait for transfer to finish */
  while( !( LPC_SSP1->SR & ( 1 << SSPSR_RNE ) ) );	 /* Wait untill the Rx FIFO is not empty */
  byte_r = LPC_SSP1->DR;

  return byte_r;                                     /* Return received value */
} 



/*******************************************************************************
* Function Name  : RD_AD
* Description    : 读取ADC值
* Input          : None
* Output         : None
* Return         : ADS7843返回二字节数据
* Attention		 : None
*******************************************************************************/
static int RD_AD(void)  
{ 
  unsigned short buf,temp; 

  temp = WR_CMD(0x00);
  buf = temp<<8; 
  DelayUS(1); 
  temp = WR_CMD(0x00);;
  buf |= temp; 
  buf>>=3; 
  buf&=0xfff; 
  return buf; 
} 


/*******************************************************************************
* Function Name  : Read_X
* Description    : 读取ADS7843通道X+的ADC值 
* Input          : None
* Output         : None
* Return         : ADS7843返回通道X+的ADC值
* Attention		 : None
*******************************************************************************/
int Read_X(void)  
{  
  int i; 
  TP_CS(0); 
  DelayUS(1); 
  WR_CMD(CHX); 
  DelayUS(1); 
  i=RD_AD(); 
  TP_CS(1); 
  return i;    
} 

/*******************************************************************************
* Function Name  : Read_Y
* Description    : 读取ADS7843通道Y+的ADC值
* Input          : None
* Output         : None
* Return         : ADS7843返回通道Y+的ADC值
* Attention		 : None
*******************************************************************************/
int Read_Y(void)  
{  
  int i; 
  TP_CS(0); 
  DelayUS(1); 
  WR_CMD(CHY); 
  DelayUS(1); 
  i=RD_AD(); 
  TP_CS(1); 
  return i;     
} 


/*******************************************************************************
* Function Name  : TP_GetAdXY
* Description    : 读取ADS7843 通道X+ 通道Y+的ADC值
* Input          : None
* Output         : None
* Return         : ADS7843返回 通道X+ 通道Y+的ADC值 
* Attention		 : None
*******************************************************************************/
void TP_GetAdXY(int *x,int *y)  
{ 
  int adx,ady; 
  adx=Read_X(); 
  DelayUS(1); 
  ady=Read_Y(); 
  *x=adx; 
  *y=ady; 
} 

/*******************************************************************************
* Function Name  : Read_Ads7846
* Description    : 得到滤波之后的X Y
* Input          : None
* Output         : None
* Return         : Coordinate结构体地址
* Attention		 : None
*******************************************************************************/
Coordinate *Read_Ads7846(void)
{
  static Coordinate  screen;
  int m0,m1,m2,TP_X[1],TP_Y[1],temp[3];
  uint8_t count=0;
  int buffer[2][9]={{0},{0}};  /* 坐标X和Y进行多次采样 */
  do					       /* 循环采样9次 */
  {		   
    TP_GetAdXY(TP_X,TP_Y);  
	buffer[0][count]=TP_X[0];  
	buffer[1][count]=TP_Y[0];
	count++;  
  }
  while(!TP_INT_IN&& count<9);  /* TP_INT_IN为触摸屏中断引脚,当用户点击触摸屏时TP_INT_IN会被置低 */
  if(count==9)   /* 成功采样9次,进行滤波 */ 
  {  
    /* 为减少运算量,分别分3组取平均值 */
    temp[0]=(buffer[0][0]+buffer[0][1]+buffer[0][2])/3;
	temp[1]=(buffer[0][3]+buffer[0][4]+buffer[0][5])/3;
	temp[2]=(buffer[0][6]+buffer[0][7]+buffer[0][8])/3;
	/* 计算3组数据的差值 */
	m0=temp[0]-temp[1];
	m1=temp[1]-temp[2];
	m2=temp[2]-temp[0];
	/* 对上述差值取绝对值 */
	m0=m0>0?m0:(-m0);
    m1=m1>0?m1:(-m1);
	m2=m2>0?m2:(-m2);
	/* 判断绝对差值是否都超过差值门限，如果这3个绝对差值都超过门限值，则判定这次采样点为野点,抛弃采样点，差值门限取为2 */
	if( m0>THRESHOLD  &&  m1>THRESHOLD  &&  m2>THRESHOLD ) return 0;
	/* 计算它们的平均值，同时赋值给screen */ 
	if(m0<m1)
	{
	  if(m2<m0) 
	    screen.x=(temp[0]+temp[2])/2;
	  else 
	    screen.x=(temp[0]+temp[1])/2;	
	}
	else if(m2<m1) 
	  screen.x=(temp[0]+temp[2])/2;
	else 
	  screen.x=(temp[1]+temp[2])/2;

	/* 同上 计算Y的平均值 */
    temp[0]=(buffer[1][0]+buffer[1][1]+buffer[1][2])/3;
	temp[1]=(buffer[1][3]+buffer[1][4]+buffer[1][5])/3;
	temp[2]=(buffer[1][6]+buffer[1][7]+buffer[1][8])/3;
	m0=temp[0]-temp[1];
	m1=temp[1]-temp[2];
	m2=temp[2]-temp[0];
	m0=m0>0?m0:(-m0);
	m1=m1>0?m1:(-m1);
	m2=m2>0?m2:(-m2);
	if(m0>THRESHOLD&&m1>THRESHOLD&&m2>THRESHOLD) return 0;

	if(m0<m1)
	{
	  if(m2<m0) 
	    screen.y=(temp[0]+temp[2])/2;
	  else 
	    screen.y=(temp[0]+temp[1])/2;	
    }
	else if(m2<m1) 
	   screen.y=(temp[0]+temp[2])/2;
	else
	   screen.y=(temp[1]+temp[2])/2;

	return &screen;
  }  
  return 0; 
}
	 
/* 下面是触摸屏到液晶屏坐标变换的转换函数 */
/* 只有在LCD和触摸屏间的误差角度非常小时,才能运用下面公式 */


/*******************************************************************************
* Function Name  : setCalibrationMatrix
* Description    : 计算出 K A B C D E F
* Input          : None
* Output         : None
* Return         : 返回1表示成功 0失败
* Attention		 : None
*******************************************************************************/uint8_t setCalibrationMatrix( Coordinate * displayPtr,                          Coordinate * screenPtr,                          Matrix * matrixPtr){  uint8_t retTHRESHOLD = 0 ;  /* K＝(X0－X2) (Y1－Y2)－(X1－X2) (Y0－Y2) */  matrixPtr->Divider = ((screenPtr[0].x - screenPtr[2].x) * (screenPtr[1].y - screenPtr[2].y)) -                        ((screenPtr[1].x - screenPtr[2].x) * (screenPtr[0].y - screenPtr[2].y)) ;  if( matrixPtr->Divider == 0 )  {    retTHRESHOLD = 1;  }  else  {
    /* A＝((XD0－XD2) (Y1－Y2)－(XD1－XD2) (Y0－Y2))／K	*/    matrixPtr->An = ((displayPtr[0].x - displayPtr[2].x) * (screenPtr[1].y - screenPtr[2].y)) -                     ((displayPtr[1].x - displayPtr[2].x) * (screenPtr[0].y - screenPtr[2].y)) ;	/* B＝((X0－X2) (XD1－XD2)－(XD0－XD2) (X1－X2))／K	*/    matrixPtr->Bn = ((screenPtr[0].x - screenPtr[2].x) * (displayPtr[1].x - displayPtr[2].x)) -                     ((displayPtr[0].x - displayPtr[2].x) * (screenPtr[1].x - screenPtr[2].x)) ;    /* C＝(Y0(X2XD1－X1XD2)+Y1(X0XD2－X2XD0)+Y2(X1XD0－X0XD1))／K */    matrixPtr->Cn = (screenPtr[2].x * displayPtr[1].x - screenPtr[1].x * displayPtr[2].x) * screenPtr[0].y +                    (screenPtr[0].x * displayPtr[2].x - screenPtr[2].x * displayPtr[0].x) * screenPtr[1].y +                    (screenPtr[1].x * displayPtr[0].x - screenPtr[0].x * displayPtr[1].x) * screenPtr[2].y ;    /* D＝((YD0－YD2) (Y1－Y2)－(YD1－YD2) (Y0－Y2))／K	*/    matrixPtr->Dn = ((displayPtr[0].y - displayPtr[2].y) * (screenPtr[1].y - screenPtr[2].y)) -                     ((displayPtr[1].y - displayPtr[2].y) * (screenPtr[0].y - screenPtr[2].y)) ;    /* E＝((X0－X2) (YD1－YD2)－(YD0－YD2) (X1－X2))／K	*/    matrixPtr->En = ((screenPtr[0].x - screenPtr[2].x) * (displayPtr[1].y - displayPtr[2].y)) -                     ((displayPtr[0].y - displayPtr[2].y) * (screenPtr[1].x - screenPtr[2].x)) ;    /* F＝(Y0(X2YD1－X1YD2)+Y1(X0YD2－X2YD0)+Y2(X1YD0－X0YD1))／K */    matrixPtr->Fn = (screenPtr[2].x * displayPtr[1].y - screenPtr[1].x * displayPtr[2].y) * screenPtr[0].y +                    (screenPtr[0].x * displayPtr[2].y - screenPtr[2].x * displayPtr[0].y) * screenPtr[1].y +                    (screenPtr[1].x * displayPtr[0].y - screenPtr[0].x * displayPtr[1].y) * screenPtr[2].y ;  }  return( retTHRESHOLD ) ;}

/*******************************************************************************
* Function Name  : getDisplayPoint
* Description    : 通过 K A B C D E F 把通道X Y的值转换为液晶屏坐标
* Input          : None
* Output         : None
* Return         : 返回1表示成功 0失败
* Attention		 : None
*******************************************************************************/
uint8_t getDisplayPoint(Coordinate * displayPtr,                     Coordinate * screenPtr,                     Matrix * matrixPtr ){  uint8_t retTHRESHOLD = 0 ;  if( matrixPtr->Divider != 0 )  {    /* XD = AX+BY+C */            displayPtr->x = ( (matrixPtr->An * screenPtr->x) +                       (matrixPtr->Bn * screenPtr->y) +                        matrixPtr->Cn                     ) / matrixPtr->Divider ;	/* YD = DX+EY+F */            displayPtr->y = ( (matrixPtr->Dn * screenPtr->x) +                       (matrixPtr->En * screenPtr->y) +                        matrixPtr->Fn                     ) / matrixPtr->Divider ;  }  else  {    retTHRESHOLD = 1;  }  return(retTHRESHOLD);} 

/*********************************************************************************************************
      END FILE
*********************************************************************************************************/
💿 文件大小 6023 K
👤 上传用户 renyumeng
📂 所属分类 uCOS编程
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#uCOSII_lwip_lpc #1768
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