chumo1.c

触控屏的控制电路制作小记相关代码

//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;count<8;count++)
 {
  if(num&0x80)
   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;count<12;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>100&&Y>100&&X<3800&&Y<3800)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>220&&y<9)
 {
　　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(!t&&count<10);  
 if(count==10)//读10次数据有效
 {  
  //X升序排列
  do
  { 
   t1=0;    
   for(t=0;t<count-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;t<count-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<=4000&&Y<=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