344 lines
7.2 KiB
C
344 lines
7.2 KiB
C
/*
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* touch.c
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*
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* Created on: 2021年8月7日
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* Author: wuwenfeng
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*/
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#include "touch.h"
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#include "LCD.h"
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#include "eeprom.h"
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//默认为touchtype=0的数据.
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#define CMD_RDX 0X90
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#define CMD_RDY 0XD0
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//SPI写数据
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//向触摸屏IC写入1byte数据
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//num:要写入的数据
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void TP_Write_Byte(char num)
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{
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for(uint8_t count=0;count<8;count++)
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{
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if(num&0x80){TDIN(1);}
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else {TDIN(0);}
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num<<=1;
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TCLK(0);
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TCLK(1); //上升沿有效
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}
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}
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//SPI读数据
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//从触摸屏IC读取adc值
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//CMD:指令
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//返回值:读到的数据
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uint16_t TP_Read_AD(char CMD)
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{
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uint16_t Num=0;
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TCLK(0); //先拉低时钟
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TDIN(0); //拉低数据线
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TCS(0); //选中触摸屏IC
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TP_Write_Byte(CMD);//发送命令字
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HAL_GetTick(); //稍微延时，ad转换需要时间
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HAL_GetTick();
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HAL_GetTick();
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HAL_GetTick();
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HAL_GetTick();
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HAL_GetTick();
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TCLK(1); //给1个时钟，清除BUSY
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TCLK(0);
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for(uint8_t count=0;count<16;count++)//读出16位数据,只有高12位有效
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{
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Num<<=1;
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TCLK(0); //下降沿有效
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TCLK(1);;
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if(TDOUT){Num++;}
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}
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Num>>=4; //只有高12位有效.
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TCS(1); //释放片选
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return(Num);
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}
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//读取一个坐标值(x或者y)
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//连续读取READ_TIMES次数据,对这些数据升序排列,
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//然后去掉最低和最高LOST_VAL个数,取平均值
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//xy:指令（CMD_RDX/CMD_RDY）
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//返回值:读到的数据
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#define READ_TIMES 5 //读取次数
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#define LOST_VAL 1 //丢弃值
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uint16_t TP_Read_XOY(uint8_t xy)
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{
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uint16_t i, j;
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uint16_t buf[READ_TIMES];
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uint16_t sum=0;
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uint16_t temp;
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for(i=0;i<READ_TIMES;i++)buf[i]=TP_Read_AD(xy);
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for(i=0;i<READ_TIMES-1; i++)//排序
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{
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for(j=i+1;j<READ_TIMES;j++)
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{
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if(buf[i]>buf[j])//升序排列
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{
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temp=buf[i];
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buf[i]=buf[j];
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buf[j]=temp;
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}
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}
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}
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sum=0;
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for(i=LOST_VAL;i<READ_TIMES-LOST_VAL;i++)sum+=buf[i];
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temp=sum/(READ_TIMES-2*LOST_VAL);
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return temp;
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}
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//读取x,y坐标
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//x,y:读取到的坐标ADC值
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void TP_Read_XY_ADC(int16_t *x,int16_t *y)
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{
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int16_t xtemp,ytemp;
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xtemp=TP_Read_XOY(CMD_RDX);
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ytemp=TP_Read_XOY(CMD_RDY);
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*x=xtemp;
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*y=ytemp;
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}
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//连续2次读取触摸屏IC,且这两次的偏差不能超过
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//ERR_RANGE,满足条件,则认为读数正确,否则读数错误.
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//该函数能大大提高准确度
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//x,y:读取到的坐标值
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//返回值:0,失败;1,成功。
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#define ERR_RANGE 10 //误差范围
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uint8_t TP_Read_XY2(int16_t *x,int16_t *y)
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{
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int16_t x1,y1;
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int16_t x2,y2;
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TP_Read_XY_ADC(&x1,&y1);
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TP_Read_XY_ADC(&x2,&y2);
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if(((x2<=x1&&x1<x2+ERR_RANGE)||(x1<=x2&&x2<x1+ERR_RANGE))//前后两次采样在+-50内
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&&((y2<=y1&&y1<y2+ERR_RANGE)||(y1<=y2&&y2<y1+ERR_RANGE)))
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{
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*x=(x1+x2)/2;
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*y=(y1+y2)/2;
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return 1;
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}else return 0;
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}
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touch_device t0;// t0 yyds~
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touch_config tconfig;
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//触摸更新服务，状态机写法，循环获取坐标
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void TP_Server()
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{
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if(TPEN==0) //如果有触摸
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{
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TP_Read_XY2(&t0.adc_x,&t0.adc_y); //先读取ad值
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t0.pix_x=(t0.adc_x/tconfig.x_acc)-tconfig.x_offset;//转换为像素坐标
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t0.pix_y=(t0.adc_y/tconfig.y_acc)-tconfig.y_offset;
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}
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}
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//直接读取
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char TP_XY(int *x,int *y)
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{
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if(TPEN==0) //如果有触摸
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{
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TP_Read_XY2(&t0.adc_x,&t0.adc_y); //先读取ad值
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*x=(t0.adc_x/tconfig.x_acc)-tconfig.x_offset;//转换为像素坐标
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*y=(t0.adc_y/tconfig.y_acc)-tconfig.y_offset;
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return 1;
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}
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return 0;
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}
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//校准用，画一个目标坐标
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//r=坐标半径，显示特效用
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void TP_DrwaTrage(int x,int y,int r)
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{
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Draw_Circle(x,y,r+1,GRAY);
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Draw_Circle(x,y,r,RED);
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LCD_DrawLine(x,y,x+10,y,RED);
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LCD_DrawLine(x,y,x,y+10,RED);
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LCD_DrawLine(x,y,x-10,y,RED);
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LCD_DrawLine(x,y,x,y-10,RED);
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}
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//触摸屏校准
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void TP_adjustment()
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{
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//判断是否需要校准，从eeprom获取数据
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EEPROM_READ_BATY(16,(char *)&tconfig,sizeof(touch_config));
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if(tconfig.begin==0xab&&tconfig.end==0xcd) //判断校准标记
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{
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return; //已经校准过了
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}
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//校准方法比较简单，读取4个坐标计算ad值与像素的关系
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char str[64]; //用于字符串提示
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uint16_t y_adc,x_adc,step=0,r=10; //adc缓存，校准步骤，坐标的半径
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uint16_t y1,y2,y3,y4,x1,x2,x3,x4; //4个点缓存
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int y5,x5,xd,xl,yd,yl; //通过4个点算出xy的长边和短边
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float acc_x,acc_y; //算出的关系倍率
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int offset_x,offset_y; //算出的偏差
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uint32_t wait=HAL_GetTick()+50000,ms100=0; //校准时间，50秒没操作就自动退出
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//显示字符串提示
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LCD_Clear(GRAY);
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LCD_ShowString(0,50,"Calibrate the touch screen",16,RED,RED);
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//TP_DrwaTrage(30,30,10);
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//开始校准
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while(HAL_GetTick()<wait)
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{
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if(TPEN==0) //如果屏幕被按下
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{
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wait=HAL_GetTick()+50000; //重置50秒
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TP_Read_XY2(&x_adc,&y_adc); //读取xy ad值
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//将读到的值显示出来
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sprintf(str,"ADC_X:%04d",x_adc);
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LCD_ShowString(100, 0, str, 16, RED, GRAY);
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sprintf(str,"ADC_Y:%04d",y_adc);
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LCD_ShowString(100, 16, str, 16, RED, GRAY);
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//特效，半径开始收缩
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if(HAL_GetTick()>ms100)
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{
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ms100=HAL_GetTick()+100;
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if(r>0){r--;}
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}
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}
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//步骤0，将点画在（30，30）此时半径为10
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if(step==0)
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{
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TP_DrwaTrage(30,30,r);
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if(r==0)//当半径收缩为0的时候
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{
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//进入下一个步骤，缓存这个点的值，显示出来
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step+=1;
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y1=y_adc;
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x1=x_adc;
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sprintf(str,"point_1 x:%d y:%d",x1,y1);
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LCD_ShowString(0,66,str,16,RED,RED);
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}
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}
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//步骤1，等待屏幕被松开，进入下一个步骤，重置半径
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if(step==1)
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{
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if(TPEN==1)
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{
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step+=1;
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r=10;
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}
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}
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//下面几个步骤和上面一样
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if(step==2)
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{
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TP_DrwaTrage(290,30,r);
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if(r==0)
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{
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step+=1;
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y2=y_adc;
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x2=x_adc;
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sprintf(str,"point_2 x:%d y:%d",x2,y2);
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LCD_ShowString(0,66+16,str,16,RED,RED);
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}
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}
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if(step==3)
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{
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if(TPEN==1)
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{
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step+=1;
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r=10;
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}
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}
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if(step==4)
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{
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TP_DrwaTrage(30,210,r);
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if(r==0)
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{
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step+=1;
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y3=y_adc;
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x3=x_adc;
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sprintf(str,"point_3 x:%d y:%d",x3,y3);
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LCD_ShowString(0,66+16+16,str,16,RED,RED);
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}
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}
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if(step==5)
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{
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if(TPEN==1)
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{
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step+=1;
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r=10;
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}
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}
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if(step==6)
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{
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TP_DrwaTrage(290,210,r);
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if(r==0)
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{
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step+=1;
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y4=y_adc;
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x4=x_adc;
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sprintf(str,"point_4 x:%d y:%d",x4,y4);
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LCD_ShowString(0,66+16+16+16,str,16,RED,RED);
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}
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}
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if(step==7)
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{
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if(TPEN==1)
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{
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step+=1;
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r=10;
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}
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}
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//当4个点读取完，开始计算关系
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if(step==8)
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{
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//其实只需要两个点就能校准，通过取平均值获得xy的长边和短边
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xd=((x1+x3)/2);
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xl=((x2+x4)/2);
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yd=((y1+y2)/2);
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yl=((y3+y4)/2);
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//长边减去短边可以再获得一个点
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x5=xl-xd;
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y5=yl-yd;
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//这个点如果是负数，肯定有错，可能是xy搞反了
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if(x5<0||y5<0)
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{
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//显示error
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sprintf(str,"ERROR");
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LCD_ShowString(0,66+16+16+16+16,str,16,RED, GRAY);
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}else
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{
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//计算关系倍率
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//ad的长边减去短边再除去实际屏幕像素的长边减短边（260=320-30-30，180=240-30-30）
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acc_x=x5/260.0;
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acc_y=y5/180.0;
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//验证倍率，将实际值减去验证值就等于误差值，因为有两个点，所以计算了两个误差后求了平均值
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offset_x=(((xd/acc_x)-30)+((xl/acc_x)-290))/2;
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offset_y=(((yd/acc_y)-30)+((yl/acc_y)-210))/2;
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//保存计算结果
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tconfig.x_acc=acc_x;
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tconfig.x_offset=offset_x;
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tconfig.y_acc=acc_y;
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tconfig.y_offset=offset_y;
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//eeprom块标记
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tconfig.begin=0xab;
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tconfig.end=0xcd;
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//显示计算结果
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sprintf(str,"x_acc=%f y_acc=%f",acc_x,acc_y);
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LCD_ShowString(0,66+16+16+16+16,str,16,RED,RED);
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sprintf(str,"x_offset=%d y_offset=%d",offset_x,offset_y);
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LCD_ShowString(0,66+16+16+16+16+16,str,16,RED,RED);
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}
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//将结果保存起来
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EEPROM_WRITE_BATY(16,(char *)&tconfig,sizeof(touch_config));
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HAL_Delay(1000);
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return;
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}
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}
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}
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