触控屏的控制电路制作小记（附STM32的驱动）

程序：

//程序来源于 www.51hei.com#include"hx8347.h" //自己编写的液晶屏头文件，此头文件只定义了一些基本变量，

不涉及驱动相关函数//定义引脚高低电平#define ADS_DCLK_H() GPIO_SetBits(GPIOB,GPIO_Pin_6)//ADS7846时钟信号#define ADS_DCLK_L() GPIO_ResetBits(GPIOB,GPIO_Pin_6)#define ADS_CS_H() GPIO_SetBits(GPIOB,GPIO_Pin_7)//ADS7846片选信号#define ADS_CS_L() GPIO_ResetBits(GPIOB,GPIO_Pin_7)#define ADS_DIN_H() GPIO_SetBits(GPIOB,GPIO_Pin_8)#define ADS_DIN_L() GPIO_ResetBits(GPIOB,GPIO_Pin_8)#define ADS_DOUT GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_9)#define ADS_PEN GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_10)////ADS7846响应信号 //初始化I/O口void ADS_GPIO_Config(){GPIO_InitTypeDef GPIO_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, GPIO_InitStructure);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_Init(GPIOB, GPIO_InitStructure);}void ADS_Spi_Start()//初始信号{ADS_CS_H();ADS_DCLK_H();ADS_DIN_H();}void ADS_Write_Byte(u8 num){u8 count=0;ADS_DCLK_L();for(count=0;count8;count++){if(num0x80)ADS_DIN_H();else ADS_DIN_L();num=1;ADS_DCLK_L();ADS_DCLK_H(); //上升沿有效 }}u16 ADS_Readdata(){u16 num;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Lif(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;tcount-1;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;tcount-1;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1NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;//阶级1NVIC_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1EXTI_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