PIC16F690做电容式触摸按键.docxVIP

?设计参考了应用笔记AN1101-1104;使用串口通信来读取振荡频率，通过读取没有按下和按下按键的不同频率来确定阀值。程序运行中也可读取每个按键通道的没有触摸时的1/16平均值，通道的扫描时间为10ms循环。?配置字是，__CONFIG (0x3BC4);#includepic.h#define uchar unsigned char?#define uint unsigned intuchar COMP1[]={0x94,0x95,0x96,0x97};//按键通道切换uchar COMP2[]={0xa0,0xa1,0xa2,0xa3};//按键通道切换uint average[]={0,0,0,0};//按键振荡计数平均值uint trip[]={400,400,250,320};//按键振荡计数阀值uchar ltmr1,htmr1;//计时器1的高8位和低8位暂存uint raw;//16位传感器当前振荡计数值uchar index=0; //按键标号uchar keya,keyb,keyc,keyd; //按键状态//-----------------------------uchar usdata=0;//串口发送数据端口号uchar rbuff; //接收缓存uchar a1,a2,a3,a4,a5;void init();//初始化配置void usart();//串口通信void touchkey();//按键判断void main(){?init();//初始化配置?while(1)?{???usart();//串口通信??touchkey();//按键判断?}}void interrupt intcon(){?if((T0IF)(T0IE))?{??T0IF=0;??//进入中断时，10ms读取tmr1的计数值??htmr1=TMR1H; //读取计数器高8位??????????ltmr1=TMR1L;//读取计数器低8位??raw=raw|htmr1;??raw=(raw8)|ltmr1;??// 按钮判断并置位按钮状态??if(raw((long)average[index]-(long)trip[index]))??{???switch(index)???{????case 0:??keya=1; break;????case 1:??keyb=1; break;????case 2:??keyc=1; break;????case 3:??keyd=1; break;????default:???break;???}??}??// 按钮判断并置位按钮状态滞后量选200??else if(raw((long)average[index]-(long)trip[index]+150))??{???switch(index)???{????case 0:??keya=0; break;????case 1:??keyb=0; break;????case 2:??keyc=0; break;????case 3:??keyd=0; break;????default:???break;???}???//求平均值???average[index]=average[index]+((long)raw-(long)average[index])/16;???}??//按键通道切换每10ms切换??index=(++index)0x03;??CM1CON0=COMP1[index];??CM2CON0=COMP2[index];????//清零寄存器为扫描下一通道准备??raw=0;??ltmr1=0;??htmr1=0;??TMR0=100;??TMR1H=0;??TMR1L=0;?}?if((TMR1IF)(TMR1IE))?{??TMR1IF=0;??TMR1H=0;??TMR1L=0;????}?if((RCIE)(RCIF))?{??rbuff=RCREG;//读取接收缓存的数据??if(OERR==1)??{???CREN=0;???asm(nop);???CREN=1;??}/*??TXEN=1;?//打开发送使能??TXREG=rbuff;//把接收到的数据送到发送缓存??while(!TRMT);//等待发送完成??TXEN=0;?//关闭发送使能*/?}}//*********初始化配置****************void init(){?OSCCON=0x70; //振荡器控制寄存器?GIE=1;//总中断开?PEIE=1;//------定时器0的配置----?OPTION=0x86; //选项寄存器配置?T0IF=0;//请定时器零中断标志位?T0IE=1;//开定时器零中断?