触控屏的控制电路制作小记

u8 count;

for(count=0;count12;count++)

{

num=1;

ADS_DCLK_H();

ADS_DCLK_L();

if(ADS_DOUT)

num++;

}

return num;

}

#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 X=0,Y=0;//当前触控坐标

u8 Readonce()

{

ADS_Spi_Start();

ADS_CS_L();

ADS_Write_Byte(CMD_RDX);

ADS_DCLK_H();

delay_us(3);

ADS_DCLK_L();

delay_us(3);

Y=ADS_Readdata();

ADS_Write_Byte(CMD_RDY);

ADS_DCLK_H();

delay_us(1);

ADS_DCLK_L();

delay_us(1);

X=ADS_Readdata();

ADS_CS_H();

if(X>100Y>100X3800Y3800)return 1;//读取成功(范围限制)

else return 0;//读取失败

}

void drawbigpoint(u8 x,u16 y,u16 col)

{

if(x>220y9)

{

LCD_DrawBlock(0,0,239,319,0x0000);//清屏

LCD_write_english_string(210,0,CLR,0xFFE0,0x001F);//清屏按键区域

}

else

{

LCD_Set_Point(x,y,col);//中心点

LCD_Set_Point((x+1),y,col);

LCD_Set_Point(x,(y+1),col);

LCD_Set_Point((x+1),(y+1),col);

}

}

//读取ADS7846(画线)

void Read_Ads7846(void)

{

u8 t,t1,count=0;

u16 databuffer[2][10]={{5,7,9,3,2,6,4,0,3,1},{5,7,9,3,2,6,4,0,3,1}};

//数据组

u16 temp=0;

//循环读数10次

do

{

t=ADS_PEN; //触摸屏被按下，PEN为L

if(Readonce()) //读数成功

{

databuffer[0][count]=X;

databuffer[1][count]=Y;

count++;

}

}

while(!tcount10);

if(count==10)//读10次数据有效

{

//X升序排列

do

{

t1=0;

for(t=0;t

{

if(databuffer[0][t]>databuffer[0][t+1])//升序排列

{

temp=databuffer[0][t+1];

databuffer[0][t+1]=databuffer[0][t];

databuffer[0][t]=temp;

t1=1;

}

}

}

while(t1);

do//Y升序排列

{

t1=0;

for(t=0;t

{

if(databuffer[1][t]>databuffer[1][t+1])//升序排列

{

temp=databuffer[1][t+1];

databuffer[1][t+1]=databuffer[1][t];

databuffer[1][t]=temp;

t1=1;

}

}

}

while(t1);

X=(databuffer[0][3]+databuffer[0][4]+databuffer[0][5])/3;

Y=(databuffer[1][3]+databuffer[1][4]+databuffer[1][5])/3;

//根据触摸屏的具体参数设置

if(X=4000Y=4000)

{

if(X>=240)

X-=240;

else X=0;

if(Y>=320)

Y-=320;

else Y=0;

drawbigpoint(X/15,Y/11+10,BLUE);

}

}

}

void EXTI1_IRQHandler(void)

{

u8 t=0;

//消除抖动

do

{

delay_us(10);

t=ADS_PEN;

Read_Ads7846();

}

while(t==0);

EXTI_ClearITPendingBit(EXTI_Line1);

}

//中断优先级管理/开启

void NVIC_Configuration(void)

{

NVIC_InitTypeDef NVIC_InitStructure;

//存储器映射

#ifdef VECT_TAB_RAM

NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);

#else

NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);

#endif

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);//优先级分到第0组 总共5组

NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQChannel; //使用外部中断1

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;//阶级1

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(NVIC_InitStructure);

}

//外部中断初始化

void EXTI_Configuration(void)//配置外部中断

{

EXTI_InitTypeDef EXTI_InitStructure; //声明中断库函数结构体

EXTI_InitStructure.EXTI_Line = EXTI_Line1; //外部中断通道1

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //中断模式

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿触发

EXTI_InitStructure.EXTI_LineCmd = ENABLE; //使能

EXTI_Init(EXTI_InitStructure);

GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource10);

//设置外部中断通道1到PB10

}

//END