C语言驱动之配置触摸屏（基于S3C2440开发板）

这是tsc.c文件

#include"s3c2440.h"
#include"tsc.h"
#include"lcd.h"
#include"irq.h"
#include "graphics.h"
#include "type.h"
#include <math.h>

#define TSC_WAIT_DOWN   (0xd3)//等待按下中断
#define   TSC_WAIT_UP       (0x1d3)//等待抬起中断
#define TSC_AUTO_XY       (0xc)   //自动X Y轴采样

//设置常见的寄存器参数
#define PRSCVL       (49<<6)   //预分频值，ADCCLK = PCLK/(PRSCVL+1)<2.5M，现在设置为1MHZ
#define PRSCEN       (1<<14)   //预分频使能位
#define ADCCON_VAL   (PRSCVL | PRSCEN) //其他位不设置

//设置消除抖动延时
//X-Tal = 3.6864MHZ,实际工作的时候
#define DELAY1 (36864) //默认消除抖动延时10ms，所以 DELAY1=10ms*X-Tal=10/1000 * 3.6864MHZ

//采样转换延时，采用PCLK,同时等待时间 > 5个周期的ADCCLK 也就是时间>1/1MHZ*5*2=10us
//在实际的测量环境中，长一点测量的值比较稳定，但是过长会导致出现抬起的时候被采样到，所以一般设置值 100us-5ms
//这边设置成1ms左右
#define DELAY2 (4000)//这个可以调整的

#define Y_BEGIN (165)
#define X_BEGIN (947) //变大往右，变小往左

#define Y_END (878)
#define X_END (80) //变大往右，变小往左

#define   TSP_SAMPLE_NUM   8   //采样点数
#define   TSP_INVALIDLIMIT   10   //有效分布范围
#define   TSP_CHANGE           20   //前后点有效具体范围

#define PLENGTH(x1,y1,x2,y2) sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2))

int touch_optimize(int x[],int y[],int *px,int *py)
{
int dx,dy;
int j,k,temp;

   //------------------------------------------------
   // if mask it ,very tremble work not well
   for(j=0;j < TSP_SAMPLE_NUM-1;++j)
   {
       for(k=j+1;k < TSP_SAMPLE_NUM;++k)
       {
           if(x[j]>x[k])
           {
               temp = x[j];
               x[j] = x[k];
               x[k] = temp;
           }
           if(y[j]>y[k])
           {
               temp = y[j];
               y[j] = y[k];
               y[k] = temp;
           }
       }
   }
   //概率分布权重法
   *px = (x[2] + ((x[3]+x[4])<<1) + (x[3]+x[4]) + x[5]);
   *py = (y[2] + ((y[3]+y[4])<<1) + (y[3]+y[4]) + y[5]);

   if((*px & 0x7) > 3)
       *px = (*px >> 3)+1;
   else
       *px = (*px >> 3);

   if((*py & 0x7) > 3)
       *py = (*py >> 3)+1;
   else
       *py = (*py >> 3);

dx = x[5] - x[2];
dy = y[5] - y[2];

return ((dx > TSP_INVALIDLIMIT || dy > TSP_INVALIDLIMIT) ? 0 : 1);
}

void tsc2pos(pos_t *pPos)
{
pPos->x = min(pPos->x,X_BEGIN);
pPos->x = max(pPos->x,X_END);

pPos->y = min(pPos->y,Y_END);//注意 X和Y 不同
pPos->y = max(pPos->y,Y_BEGIN);

   //坐标转换
   pPos->x = (LCD_WIDTH-1)*(X_BEGIN - pPos->x) / (X_BEGIN - X_END);
   pPos->y = (LCD_HIGH-1)*(pPos->y - Y_BEGIN) / (Y_END - Y_BEGIN);
}

int tsc_adc(pos_t *pPos)
{
   int x[TSP_SAMPLE_NUM],y[TSP_SAMPLE_NUM];
   int i,px,py;
   static pos_t old;

   if(!(ADCDAT0 & (1<<15)))
   {
       for(i=0;i<TSP_SAMPLE_NUM;i++)
       {
           //1 设置AUT0 XY采样模式
           ADCTSC = TSC_AUTO_XY;

           //2 设置采样的延时时间
           ADCDLY = DELAY2;

           //3 开启采样开关
           ADCCON |= (1 << 0);

           //4 等待采样结束
           while(ADCCON & 0X1);
           while(!(ADCCON & (1 << 15)));//等待采样结束

           //5 存储数据，拿来计算
           x[i] = (ADCDAT1 & 0x3ff);
           y[i] = (ADCDAT0 & 0x3ff);
       }

       //6   恢复抬起中断模式
       ADCTSC = TSC_WAIT_UP;

       //采样转换优化，采用概率分布校准
       if(touch_optimize(x,y,&px,&py))
       {
           pPos->x = px;
           pPos->y = py;
           tsc2pos(pPos);
           if(old.x == 0 && old.y ==0)
           {
               old = *pPos;
               return 1;
           }
           else if(PLENGTH(old.x,old.y,pPos->x,pPos->y)< TSP_CHANGE)
           {
               old = *pPos;
               return 1;
           }
       }

   }
   else
   {
       old.x = 0;
       old.y = 0;
   }
   return 0;
}

static void tsc_updn_irq(void)
{

   if(ADCDAT0 & (1<<15))//抬起状态
   {
      ADCTSC = TSC_WAIT_DOWN;
   //     lcd_clean(0,0,480,272,GREEN);
   }
   else//按下状态
   {
       ADCTSC = TSC_WAIT_UP;
//       lcd_clean(0,0,480,272,GREEN);
   }
}

void tsc_init(void)
{
//1 设置ADCCON,设置转换器的AD频率
ADCCON = ADCCON_VAL;

//2 设置触摸屏为等待按下中断模式
ADCTSC = TSC_WAIT_DOWN;

   //3 设置消除抖动延时
   ADCDLY = DELAY1;

   //4 安装触摸屏中断
   irq_install(IRQ_SUB_TC,tsc_updn_irq);
}

--------------------------------------------------------------华丽的分割线----------------------------------------------------------------------

这是tsc.h文件

#ifndef _TOUCH_H_
#define _TOUCH_H_

#include "snake.h"

void tsc_init(void);
int tsc_adc(pos_t *pPos);

#endif

C语言驱动之配置触摸屏（基于S3C2440开发板）

猜你喜欢