u8 Read_ADS2(u16 *x,u16 *y)
{
u16 x1,y1;
u16 x2,y2;
u8 flag;
flag=Read_ADS(&x1,&y1);
if(flag==0)return(0);
flag=Read_ADS(&x2,&y2);
if(flag==0)return(0);
if(((x2<=x1&&x1<x2+ERR_RANGE)||(x1<=x2&&x2<x1+ERR_RANGE))//前后两次采样在+-ERR_RANGE内
&&((y2<=y1&&y1<y2+ERR_RANGE)||(y1<=y2&&y2<y1+ERR_RANGE)))
{
*x=(x1+x2)>>1;
*y=(y1+y2)>>1;
return 1;
}else return 0;
uint8_t Read_ADS2(uint16_t *x, uint16_t *y)
{
uint16_t x1, y1;
uint16_t x2, y2;
uint8_t flag;
flag = Read_ADS(&x1, &y1);
if(flag == 0) { return(0); }
flag = Read_ADS(&x2, &y2);
if(flag == 0) { return(0); }
if(((x2 <= x1 && x1 < x2 + ERR_RANGE) || (x1 <= x2 && x2 < x1 + ERR_RANGE)) //前后两次采样在+-50内
&& ((y2 <= y1 && y1 < y2 + ERR_RANGE) || (y1 <= y2 && y2 < y1 + ERR_RANGE)))
{
*x = (x1 + x2) / 2;
*y = (y1 + y2) / 2;
return 1;
}
else { return 0; }
}
//外部中断初始化函数
void Touch_Init(void)
{
NVIC_InitTypeDef NVIC_InitStructure; //中断
GPIO_InitTypeDef GPIO_InitStructure; //GPIO
EXTI_InitTypeDef EXTI_InitStructure; //外部中断线
//注意,时钟使能之后,对GPIO的操作才有效
//所以上拉之前,必须使能时钟.才能实现真正的上拉输出
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_0|GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU ; //上拉输入
GPIO_Init(GPIOC, &GPIO_InitStructure);
Read_ADS(&Pen_Point.X,&Pen_Point.Y);//第一次读取初始化
NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn; //使能按键所在的外部中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占优先级2级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //从优先级0级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外部中断通道
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource1);
EXTI_InitStructure.EXTI_Line = EXTI_Line1; //外部线路EXIT1
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //设外外部中断模式:EXTI线路为中断请求
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //外部中断触发沿选择:设置输入线路下降沿为中断请求
EXTI_InitStructure.EXTI_LineCmd = ENABLE; //使能外部中断新状态
EXTI_Init(&EXTI_InitStructure); //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器
#ifdef ADJ_SAVE_ENABLE
AT24CXX_Init();//初始化24CXX
if(Get_Adjdata())return;//已经校准
else //未校准?
{
LCD_Clear(WHITE);//清屏
Touch_Adjust(); //屏幕校准
Save_Adjdata();
}
Get_Adjdata();
#else
LCD_Clear(WHITE);//清屏
Touch_Adjust(); //屏幕校准,带自动保存
#endif
}
//外部中断初始化函数
void Touch_Init(void)
{
//注意,时钟使能之后,对GPIO的操作才有效
//所以上拉之前,必须使能时钟.才能实现真正的上拉输出
RCC->APB2ENR|=1<<4; //PC时钟使能
RCC->APB2ENR|=1<<0; //开启辅助时钟
GPIOC->CRL&=0XFFFF0000;//PC0~3
GPIOC->CRL|=0X00003883;
GPIOC->CRH&=0XFF0FFFFF;//PC13
GPIOC->CRH|=0X00300000;//PC13推挽输出
GPIOC->ODR|=0X200f; //PC0~3 13 全部上拉
Read_ADS(&Pen_Point.X,&Pen_Point.Y);//第一次读取初始化
MY_NVIC_Init(2,0,EXTI1_IRQChannel,2);
RCC->APB2ENR|=0x01; //使能io复用时钟
AFIO->EXTICR[0]|=0X0020; //EXTI13映射到PC1
EXTI->IMR|=1<<1; //开启line1上的中断
EXTI->EMR|=1<<1; //不屏蔽line1上的事件
EXTI->FTSR|=1<<1; //line1上事件下降沿触发
#ifdef ADJ_SAVE_ENABLE
AT24CXX_Init();//初始化24CXX
if(Get_Adjdata())return;//已经校准
else //未校准?
{
LCD_Clear(WHITE);//清屏
Touch_Adjust(); //屏幕校准
Save_Adjdata();
}
Get_Adjdata();
#else
LCD_Clear(WHITE);//清屏
Touch_Adjust(); //屏幕校准,带自动保存
#endif
// printf("Pen_Point.xfac:%f\n",Pen_Point.xfac);
// printf("Pen_Point.yfac:%f\n",Pen_Point.yfac);
// printf("Pen_Point.xoff:%d\n",Pen_Point.xoff);
// printf("Pen_Point.yoff:%d\n",Pen_Point.yoff);
}