学习STM32 玩TFT屏第十季之触摸屏毕业篇

chinafox · 发表于 2012-6-25 02:33:39

上一季那个代码运行后,发现没触摸到屏的时候 X值大多数是4095 就是说, 硬件已做成这样了.就是X是4095的时候,那就表明这个值就等同于0了.

对于Y值来说,大多数时间是0,但也会跳,从二十多到一百五十多不等.

这是屏没有笔点上去的时候是这样,如果有笔点上去,跳到就变少很多,都在正负三十左右跳动.

那问题就出来了,

没笔点的时候怎么处理?
有笔点的时候怎么处理?

好了,我们点一下其它地方,发现在屏有显示的位置四个角的坐标分是(大约的值):

左上角 x=210 y=210

右上角 x=210 y=3800

左下角 x=3300 y=210

右下角 x=3650 y=3800

看到问题没有,说明我这个触摸屏比较坑爹.看左下角和右下角红字部分,和左下角平的另一边差别有350个数值这么大.

右下角的电阻分布有问题.这样会造成拾取坐标误差很大.我在右中到右下,都点了下,发现中部还行,越住下就差别越大.

没法子了,我设定如下, Y<210 和 Y>3800 的值全部不要. X<210 和 X>3300的不要.

我们显示的分辨率是 320 X 240 而触摸屏 Y的像素是4095-((4095-3800)+210)=3480(减掉不要的) X的是4095-((4095-3300)+210)=3000(减掉不要的)

我们就得出 X方向约10个值对应 1个像素. Y方向上15个数值对应1个像素.

对于数据跳动情况,我们彩取连读10个值,再将前5个值的平均值和后五个值的平均值相比,差大于50的不要.

好,有了想法,我们就更改一下上一季的主函数.

// 主函数 ************************************************************************************************

int main(void)

{

u16 i,zx,zy,x1,x2,y1,y2,datax[10],datay[10];

Stm32_Clock_Init(9);

delay_init(72);

uart_init(72,9600);

LCD_IO_Init();

LCD_init();

B_COLOR=color(7,14,7);

clear_lcd();

while (1)

{

ADS7843SPI_start();

for(i=0;i<10;i++)

{

Write_Com_to_7843(CMD_RDX); <<===X读 10次

datax=Read_data_form7843();

}

for(i=0;i<10;i++)

{

Write_Com_to_7843(CMD_RDY); <<=== Y读10次

datay=Read_data_form7843();

}

x1=datax[0]+datax[1]+datax[2]+datax[3]+datax[4]; <<=== X,Y得到前半部分和后半部分的平均数

x2=datax[5]+datax[6]+datax[7]+datax[8]+datax[9];

x1=x1/5;

x2=x2/5;

y1=datay[0]+datay[1]+datay[2]+datay[3]+datay[4];

y2=datay[5]+datay[6]+datay[7]+datay[8]+datay[9];

y1=y1/5;

y2=y2/5;

if(x1>=x2) <<==== 得到X及Y 的前半部分和后半部分的差值

{

zx=x1-x2;

}

else

{

zx=x2-x1;

}

if(y1>=y2)

{

zy=y1-y2;

}

else

{

zy=y2-y1;

}

F_COLOR = color(30,60,0); <<======介面的显示部分

linechar_1608t(18,3," X data\0");

linechar_1608t(18,18," Y data\0");

if ((x1>210)&(x1<3300)&(zx<50))

{

F_COLOR = color(0,60,0);

count_show(19,1,x1);

count_show(19,6,x2);

count_show(19,11,zx);

}

if ((y1>210)&(y1<3800)&(zy<50))

{

F_COLOR = color(30,60,30);

count_show(19,16,y1);

count_show(19,21,y2);

count_show(19,27,zy);

}

delay_ms(100);

B_COLOR=color(7,14,7);

Clear_line(19,0,29);

Clear_line(19,0,29);

}

}

将上一季的代码的MAIN()程式改成以上的代码.大家看是不是用TFT屏做的介面很牛B. ^_^

我看显示的数值发现,Y方向的取值比X方向的取值稳定很多!!!

好了,以上的代码我们可以拿来测试触摸屏了存起来在朋友同事面前牛去吧 ^-^Y

原子老大,你给我的这个触摸屏忒差了,右下角几乎没用.呃...........我刚叫MM在淘宝给我买10块屏,不知到时啥样.偷偷告诉大家,忒更宜.

我决定用新学的STM32加TFT屏来做我正在设计的主控板.到时将代码丢来给大家玩玩.

好,再接再厉,我们搞个画画的代码,修改一下主程式就行.

// 主函数 ************************************************************************************************

int main(void)

{

u16 i,zx,zy,x1,x2,y1,y2,datax[10],datay[10];

Stm32_Clock_Init(9);

delay_init(72);

uart_init(72,9600);

LCD_IO_Init();

LCD_init();

B_COLOR=color(7,14,7);

clear_lcd();

while (1)

{

ADS7843SPI_start();

for(i=0;i<10;i++)

{

Write_Com_to_7843(CMD_RDX);

datax=Read_data_form7843();

}

for(i=0;i<10;i++)

{

Write_Com_to_7843(CMD_RDY);

datay=Read_data_form7843();

}

x1=datax[0]+datax[1]+datax[2]+datax[3]+datax[4];

x2=datax[5]+datax[6]+datax[7]+datax[8]+datax[9];

x1=x1/5;

x2=x2/5;

y1=datay[0]+datay[1]+datay[2]+datay[3]+datay[4];

y2=datay[5]+datay[6]+datay[7]+datay[8]+datay[9];

y1=y1/5;

y2=y2/5;

if(x1>=x2)

{

zx=x1-x2;

}

else

{

zx=x2-x1;

}

if(y1>=y2)

{

zy=y1-y2;

}

else

{

zy=y2-y1;

}

F_COLOR = color(30,60,0);

linechar_1608t(18,3," X data\0");

linechar_1608t(18,18," Y data\0");

if ((x1>210)&(x1<3300)&(zx<50))

{

F_COLOR = color(0,60,0);

count_show(19,1,x1);

count_show(19,6,x2);

count_show(19,11,zx);

}

if ((y1>210)&(y1<3800)&(zy<50))

{

F_COLOR = color(30,60,30);

count_show(19,16,y1);

count_show(19,21,y2);

count_show(19,27,zy);

  }

if ((y1>210)&(y1<3800)&(zy<50)&(x1>210)&(x1<3300)&(zx<50))

{

DrawPoint(((y1+y2)/2)/17,((x1+x2)/2)/12); <<=绿色的17 和12 是因为触摸屏的误差太大,本来算好的值不太准,随手加点减点调上去的,你们的屏可能不同,可以自行调一下.

}

delay_ms(50);

B_COLOR=color(7,14,7);

Clear_line(19,0,29);

Clear_line(19,0,29);

}

}

只不过是加了红色字那部分而已,同学们要写快点要注释掉绿色字的这些.因为点太小,我们修改一画点函数,让点大点.

//画一个点 ************************************************************************************************

void DrawPoint(u16 x,u16 y)

{

u8 i,j;

for (i=0;i<3;i++)

{

for (j=0;j<3;j++)

{

LCD_WriteReg(0x0020,x+i); //X

LCD_WriteReg(0x0021,y+j); //Y

LCD_WR_REG(0x22);

LCD_WR_DATA(F_COLOR);

LCD_WriteReg(0x0020,x-i); //X

LCD_WriteReg(0x0021,y-j); //Y

LCD_WR_REG(0x22);

LCD_WR_DATA(F_COLOR);

}

}

}

扩大6倍.

好,编译好丢进板子,画个画吧.哈哈.画吧.

画画只是玩玩,真实应用中没什么用的,只是当当简单的按键用用还是行的.

中断的玩法大家自己去玩玩吧,我们都学过的.很容易的,时间问题,我就不搞了.

好了,TFT屏和触摸屏我们毕业了,明天我们开搞无线模块了~~~~~~~~~~~~~~~~~~~

这季的所有代码,我帖出来大家玩下吧.

#include "sys.h"

#include "usart.h"

#include "delay.h"

#include "FONT.h"

//快速IO

#define LCD_CS_SET GPIOC->BSRR=1<<9 //片选端口    PC9

#define LCD_RS_SET GPIOC->BSRR=1<<8 //数据/命令 C8

#define LCD_WR_SET GPIOC->BSRR=1<<7 //写数据    PC7

#define LCD_RD_SET GPIOC->BSRR=1<<6 //读数据    PC6



#define LCD_CS_CLR GPIOC->BRR=1<<9 //片选端口    PC9

#define LCD_RS_CLR GPIOC->BRR=1<<8 //数据/命令 C8

#define LCD_WR_CLR GPIOC->BRR=1<<7 //写数据    PC7

#define LCD_RD_CLR GPIOC->BRR=1<<6 //读数据    PC6



//慢速IO

#define LCD_CS PCout(9) //片选端口    PC9

#define LCD_RS PCout(8) //数据/命令 C8

#define LCD_WR PCout(7) //写数据 PC7

#define LCD_RD PCout(6) //读数据 PC6

#define LCD_LED PCout(10) //背光

//PB0~15,作为数据线

#define DATAOUT(x) GPIOB->ODR=x; //数据输出

#define DATAIN GPIOB->IDR; //数据输入

#define LCD_WR_DATA(data){\

LCD_RS_SET;\

LCD_CS_CLR;\

DATAOUT(data);\

LCD_WR_CLR;\

LCD_WR_SET;\

LCD_CS_SET;\

}

//与触摸屏芯片连接引脚

#define PEN Cin(1) //PC1 INT

#define DOUT PCin(2) //PC2 MISO

#define DIN Cout(3) //PC3 MOSI

#define DCLK PCout(0) //PC0 SCLK

#define CS PCout(13) //PC13 CS

#define CMD_RDX 0X90 //0B10010000 即用差分方式读X坐标

#define CMD_RDY    0XD0 //0B11010000 即用差分方式读Y坐标

u16 F_COLOR,B_COLOR;

// IO 初始化 ****************************************************************************************

void LCD_IO_Init(void)

{

RCC->APB2ENR|=1<<3;//先使能外设PORTB时钟

RCC->APB2ENR|=1<<4;//先使能外设PORTC时钟

RCC->APB2ENR|=1<<0; //开启辅助时钟

JTAG_Set(SWD_ENABLE); //开启SWD

//PORTC6~10 推挽输出

GPIOC->CRH&=0XFF0FF000;

GPIOC->CRH|=0X00300333;

GPIOC->CRL&=0X00FF0000;

GPIOC->CRL|=0X33003883;

GPIOC->ODR|=0X07C0;

GPIOC->ODR|=0X200F;

//PORTB 推挽输出

GPIOB->CRH=0X33333333;

GPIOB->CRL=0X33333333;

GPIOB->ODR=0XFFFF;

}

////正常IO写寄存器函数

//void LCD_WR_REG(u8 data)

//{

// LCD_RS=0;//写地址

// LCD_CS=0;

// DATAOUT(data);

// LCD_WR=0;

// LCD_WR=1;

// LCD_CS=1;

//}

//

////正常IO写 8位数据函数

//void LCD_WR_DATA(u16 data)

//

//{

//LCD_RS=1;

//LCD_CS=0;

//DATAOUT(data);

//LCD_WR=0;

//LCD_WR=1;

//LCD_CS=1;

//}

//写寄存器函数=>快

void LCD_WR_REG(u8 data)

{

LCD_RS_CLR;//写地址

LCD_CS_CLR;

DATAOUT(data);

LCD_WR_CLR;

LCD_WR_SET;

LCD_CS_SET;

}

//写寄存器

void LCD_WriteReg(u8 LCD_Reg, u16 LCD_RegValue)

{

LCD_WR_REG(LCD_Reg);

LCD_WR_DATA(LCD_RegValue);

}

//读寄存器

u16 LCD_ReadReg(u8 LCD_Reg)

{

u16 t;

LCD_WR_REG(LCD_Reg); //写入要读的寄存器号

GPIOB->CRL=0X88888888; //PB0-7 上拉输入

GPIOB->CRH=0X88888888; //PB8-15 上拉输入

GPIOB->ODR=0XFFFF; //全部输出高

LCD_RS=1;

LCD_CS=0;

//读取数据(读寄存器时,并不需要读2次)

LCD_RD=0;

LCD_RD=1;

t=DATAIN;

LCD_CS=1;

GPIOB->CRL=0X33333333; //PB0-7 上拉输出

GPIOB->CRH=0X33333333; //PB8-15 上拉输出

GPIOB->ODR=0XFFFF; //全部输出高

return t;

}

//返回值:此点的颜色

u16 LCD_ReadPoint(u16 x,u16 y)

{

u16 t;

LCD_WriteReg(0x0020,x); //X

LCD_WriteReg(0x0021,y); //Y

LCD_WR_REG(0x22); //选择GRAM地址

GPIOB->CRL=0X88888888; //PB0-7 上拉输入

GPIOB->CRH=0X88888888; //PB8-15 上拉输入

GPIOB->ODR=0XFFFF; //全部输出高

LCD_RS_SET;

LCD_CS_CLR;

//读取数据(读GRAM时,需要读2次)

LCD_RD_CLR;

LCD_RD_SET;

delay_us(2);//FOR 9320,延时2us

//dummy READ

LCD_RD_CLR;

delay_us(2);//FOR 8989,延时2us

LCD_RD_SET;

t=DATAIN;

LCD_CS_SET;

GPIOB->CRL=0X33333333; //PB0-7 上拉输出

GPIOB->CRH=0X33333333; //PB8-15 上拉输出

GPIOB->ODR=0XFFFF; //全部输出高

return t;

}

void LCD_init() // LCD ID: 0xB505

{

LCD_WriteReg(0x0000,0x0000);

LCD_WriteReg(0x0000,0x0000);

LCD_WriteReg(0x0000,0x0000);

LCD_WriteReg(0x0000,0x0000);

LCD_WriteReg(0x00a4,0x0001);

delay_ms(20);

LCD_WriteReg(0x0060,0x2700);

LCD_WriteReg(0x0008,0x0202);

LCD_WriteReg(0x0030,0x0214);

LCD_WriteReg(0x0031,0x3715);

LCD_WriteReg(0x0032,0x0604);

LCD_WriteReg(0x0033,0x0e16);

LCD_WriteReg(0x0034,0x2211);

LCD_WriteReg(0x0035,0x1500);

LCD_WriteReg(0x0036,0x8507);

LCD_WriteReg(0x0037,0x1407);

LCD_WriteReg(0x0038,0x1403);

LCD_WriteReg(0x0039,0x0020);

LCD_WriteReg(0x0090,0x001a);

LCD_WriteReg(0x0010,0x0000);

LCD_WriteReg(0x0011,0x0007);

LCD_WriteReg(0x0012,0x0000);

LCD_WriteReg(0x0013,0x0000);

delay_ms(20);

LCD_WriteReg(0x0010,0x0730);

LCD_WriteReg(0x0011,0x0137);

delay_ms(20);

LCD_WriteReg(0x0012,0x01b8);

delay_ms(20);

LCD_WriteReg(0x0013,0x0f00);

LCD_WriteReg(0x002a,0x0080);

LCD_WriteReg(0x0029,0x0048);

delay_ms(20);

LCD_WriteReg(0x0001,0x0100);

LCD_WriteReg(0x0002,0x0700);

LCD_WriteReg(0x0003,0x1230);//LCD_WriteReg(0x0003,0x1230);

LCD_WriteReg(0x0008,0x0202);

LCD_WriteReg(0x000a,0x0000);

LCD_WriteReg(0x000c,0x0000);

LCD_WriteReg(0x000d,0x0000);

LCD_WriteReg(0x000e,0x0030);

LCD_WriteReg(0x0050,0x0000);

LCD_WriteReg(0x0051,0x00ef);

LCD_WriteReg(0x0052,0x0000);

LCD_WriteReg(0x0053,0x013f);

LCD_WriteReg(0x0060,0x2700);

LCD_WriteReg(0x0061,0x0001);

LCD_WriteReg(0x006a,0x0000);

//LCD_WriteReg(0x0080,0x0000);

//LCD_WriteReg(0x0081,0x0000);

LCD_WriteReg(0x0090,0X0011);

LCD_WriteReg(0x0092,0x0600);

LCD_WriteReg(0x0093,0x0402);

LCD_WriteReg(0x0094,0x0002);

delay_ms(20);

LCD_WriteReg(0x0007,0x0001);

delay_ms(20);

LCD_WriteReg(0x0007,0x0061);

LCD_WriteReg(0x0007,0x0173);

LCD_WriteReg(0x0020,0x0000);

LCD_WriteReg(0x0021,0x0000);

LCD_WriteReg(0x00,0x22);

LCD_LED=1;

}

//设置一种颜色************************************************************************************************

u16 color(u8 R,u8 G,u8 B)

{

u16 CRGB,RGB0,RGB1,RGB2,RGB3,RGB4;

RGB0=B;

RGB1=G;

RGB2=RGB1<<5;

RGB3=R;

RGB4=RGB3<<11;

CRGB =RGB0|RGB2|RGB4;

return CRGB;

}

//画一个点 ************************************************************************************************

void DrawPoint(u16 x,u16 y)

{

u8 i,j;

for (i=0;i<3;i++)

{

for (j=0;j<3;j++)

{

LCD_WriteReg(0x0020,x+i); //X

LCD_WriteReg(0x0021,y+j); //Y

LCD_WR_REG(0x22);

LCD_WR_DATA(F_COLOR);

LCD_WriteReg(0x0020,x-i); //X

LCD_WriteReg(0x0021,y-j); //Y

LCD_WR_REG(0x22);

LCD_WR_DATA(F_COLOR);

}

}

}

//以背景色清屏 ************************************************************************************************

void clear_lcd()

{

u16 i,j;

LCD_WriteReg(0x0020,0x00); //X

LCD_WriteReg(0x0021,0x00); //Y

LCD_WR_REG(0x22);

for (i=0;i<320;i++)

{

for (j=0;j<240;j++)

{

LCD_WR_DATA(B_COLOR);

}

}

}

//透明背景色的显示字符函数 ***********************************************************************************

void SHOW_char_NBC(u8 Page,u8 List,u8 onechar)

{

u8 i,j;

u16 temp1,temp2,temp3,temp4;

temp1=onechar-' ';

temp3=F_COLOR;

for (i=0;i<16;i++)

{

temp4=asc2_1608[temp1];

for (j=0;j<8;j++)

{

temp2 = temp4;

temp2 &= 0x01;

temp4 >>=1;

if(temp2==0)

{

F_COLOR=LCD_ReadPoint(List*8+j,Page*16+i);

}

else

   {

   F_COLOR=temp3;

}

LCD_WriteReg(0x0020,List*8+j); //X

LCD_WriteReg(0x0021,Page*16+i); //Y

LCD_WR_REG(0x22);

LCD_WR_DATA(F_COLOR);

}

}

F_COLOR=temp3; //返回颜色值

}

//固定前影色和背景色的显示字符函数 ************************************************************************************************

void SHOW_char(u8 Page,u8 List,u8 onechar)

{

u8 i,j;

u16 temp1,temp2,temp3,temp4;

temp1=onechar-' ';

temp3=F_COLOR;

LCD_WriteReg(0x0050,List*8);

LCD_WriteReg(0x0051,(List*8)+7);

LCD_WriteReg(0x0052,Page*16);

LCD_WriteReg(0x0053,(Page*16)+15);

LCD_WriteReg(0x0020,List*8); //X

LCD_WriteReg(0x0021,Page*16); //Y

LCD_WR_REG(0x22);

for (i=0;i<16;i++)

{

temp4=asc2_1608[temp1];

for (j=0;j<8;j++)

{

temp2 = temp4;

temp2 &= 0x01;

temp4 >>=1;

if(temp2==0)

{

F_COLOR=B_COLOR;

}

else

   {

   F_COLOR=temp3;

}

LCD_WR_DATA(F_COLOR);

}

}

F_COLOR=temp3;

LCD_WriteReg(0x0050,0);    //开放回窗口

LCD_WriteReg(0x0051,239);

LCD_WriteReg(0x0052,0);

LCD_WriteReg(0x0053,319);

}

//用背景色刷出N个字符位 *****************************************************************************************

void Clear_line(u8 page,u8 list,u8 N)

{

u8 i;

for (i=0;i<N;i++)

{

SHOW_char(page,list,' ');

list=list+1;

}

}

//显示一串字符函数 ************************************************************************************************

void linechar_1608t(u8 Page,u8 List,u8 *pd)

{

u8 temp;

while((*pd)!='\0')

{

  temp=*pd;

  SHOW_char_NBC(Page,List,temp);

  pd++;

  List=List+1;

}

}

// 显示数字串 *******************************************************************************************

void count_show(u8 Page,u8 List,u16 input)

{

u16 temp0,temp1,temp2,temp3,temp4,A,B;

temp0=input/10000; //将脉冲个数转换成字符由1602输出



A=input%10000;

temp1=A/1000;

B=A%1000;

temp2=B/100;

A=B%100;

temp3=A/10;

B=A%10;

temp4=B;



if (temp0!=0)

   {

SHOW_char_NBC(Page,List,'0'+temp0);

List=List+1;

}

if ((temp1!=0)|(temp0!=0))

   {

SHOW_char_NBC(Page,List,'0'+temp1);

List=List+1;

}

if ((temp2!=0)|(temp1!=0)|(temp0!=0))

   {

SHOW_char_NBC(Page,List,'0'+temp2);

List=List+1;

}

if ((temp3!=0)|(temp2!=0)|(temp1!=0)|(temp0!=0))

   {

SHOW_char_NBC(Page,List,'0'+temp3);

List=List+1;

}

SHOW_char_NBC(Page,List,'0'+temp4);

}

// SPI 启动 *******************************************************************************************

void ADS7843SPI_start()

{

DCLK=0;

CS=1;

DIN=1;

DCLK=1;

CS=0;

}

// 写一个命令到ADS7843 ********************************************************************************

void Write_Com_to_7843(u8 COM)

{

u8 i,temp;

DCLK=0;

// CS=0;

for (i=0;i<8;i++)

{

temp=COM & 0x80; //从最高位取Bit

if (temp==0)

{

DIN=0;

}

else

   {

DIN=1;

}

COM<<=1;

    DCLK=0; //底电平放数上总线

    DCLK=1;   //上升沿后 ADS7843 读总线数据

}

// CS=1;

}

// 读一个数据到ADS7843 ********************************************************************************

u16 Read_data_form7843()

{

u8 i;

u16 data;

delay_us(6); //ADS7846的转换时间最长为6us 看TI资料的第九页 ADS7843 BUSY 很忙要给他时间

DCLK=1; //给1个时钟，清除BUSY

DCLK=0;

for (i=0;i<16;i++)

{

data<<=1;

DCLK=1;

delay_us(1);

DCLK=0; //SPI 读数据刚好和写数据相反, 是在时钟下降沿后主机才能读数据

if (DOUT)data++;

}

data>>=4; //两个时钟周期中,后4位全是0没有用,要去掉.因为ADS7843只给出12位精度的数据

return (data);

}

// 主函数 ************************************************************************************************

int main(void)

{

u16 i,zx,zy,x1,x2,y1,y2,datax[10],datay[10];

Stm32_Clock_Init(9);

delay_init(72);

uart_init(72,9600);

LCD_IO_Init();

LCD_init();

B_COLOR=color(7,14,7);

clear_lcd();

while (1)

{

ADS7843SPI_start();

for(i=0;i<10;i++)

{

Write_Com_to_7843(CMD_RDX);

datax=Read_data_form7843();

}

for(i=0;i<10;i++)

{

Write_Com_to_7843(CMD_RDY);

datay=Read_data_form7843();

}

x1=datax[0]+datax[1]+datax[2]+datax[3]+datax[4];

x2=datax[5]+datax[6]+datax[7]+datax[8]+datax[9];

x1=x1/5;

x2=x2/5;

y1=datay[0]+datay[1]+datay[2]+datay[3]+datay[4];

y2=datay[5]+datay[6]+datay[7]+datay[8]+datay[9];

y1=y1/5;

y2=y2/5;

if(x1>=x2)

{

zx=x1-x2;

}

else

{

zx=x2-x1;

}

if(y1>=y2)

{

zy=y1-y2;

}

else

{

zy=y2-y1;

}

F_COLOR = color(30,60,0);

linechar_1608t(18,3," X data\0");

linechar_1608t(18,18," Y data\0");

if ((x1>210)&(x1<3300)&(zx<50))

{

F_COLOR = color(0,60,0);

count_show(19,1,x1);

count_show(19,6,x2);

count_show(19,11,zx);

}

if ((y1>210)&(y1<3800)&(zy<50))

{

F_COLOR = color(30,60,30);

count_show(19,16,y1);

count_show(19,21,y2);

count_show(19,27,zy);

  }

if ((y1>210)&(y1<3800)&(zy<50)&(x1>210)&(x1<3300)&(zx<50))

{

DrawPoint(((y1+y2)/2)/17,((x1+x2)/2)/12);

}

delay_ms(50);

B_COLOR=color(7,14,7);

Clear_line(19,0,29);

Clear_line(19,0,29);

}

}