keyscan.c

用MSP430(C)写的红外抄表程序,是初学者好代码

/******************************************************************************/
//
/******************************************************************************/
#include <msp430x14x.h>

void key_main(void)
{
 Init_Port();
 key_state();
}

void Init_Port(void)
{
    //将P1口所有的管脚在初始化的时候设置为输入方式
    P1DIR = 0;
 
    //将P1口所有的管脚设置为一般I/O口
    P1SEL = 0;
    
    // 将P1.4 P1.5 P1.6 P1.7设置为输出方向
    P1DIR |= BIT4;
    P1DIR |= BIT5;
    P1DIR |= BIT6;
    P1DIR |= BIT7;

    //先输出低电平
    P1OUT = 0x00;

    // 将中断寄存器清零
    P1IE = 0;
    P1IES = 0;
    P1IFG = 0;
    //打开管脚的中断功能
    //对应的管脚由高到低电平跳变使相应的标志置位
    P1IE |= BIT0; 
    P1IES |= BIT0; 
    P1IE |= BIT1; 
    P1IES |= BIT1;
    P1IE |= BIT2; 
    P1IES |= BIT2; 
    P1IE |= BIT3; 
    P1IES |= BIT3;
    _EINT();//打开中断
    return;
}

void Delay(void)
{
 int i;
 for(i = 100;i--;i > 0) ;//延时一点时间
}

int KeyProcess(void)
{
    int nP10,nP11,nP12,nP13;
 int nRes = 0;
 //P1.4输出低电平
 P1OUT &= ~(BIT4);
 nP10 = P1IN & BIT0;
 if (nP10 == 0) nRes = 13;
 nP11 = P1IN & BIT1;
 if (nP11 == 0) nRes = 14;
 nP12 = P1IN & BIT2;
 if (nP12 == 0) nRes = 15;
 nP13 = P1IN & BIT3;
 if (nP13 == 0) nRes = 16;
 //P1.5输出低电平
 P1OUT &= ~(BIT4);
 nP10 = P1IN & BIT0;
 if (nP10 == 0) nRes = 9;
 nP11 = P1IN & BIT1;
 if (nP11 == 0) nRes = 10;
 nP12 = P1IN & BIT2;
 if (nP12 == 0) nRes = 11;
 nP13 = P1IN & BIT3;
 if (nP13 == 0) nRes = 12;
 //P1.6输出低电平
 P1OUT &= ~(BIT4);
 nP10 = P1IN & BIT0;
 if (nP10 == 0) nRes = 5;
 nP11 = P1IN & BIT1;
 if (nP11 == 0) nRes = 6;
 nP12 = P1IN & BIT2;
 if (nP12 == 0) nRes = 7;
 nP13 = P1IN & BIT3;
 if (nP13 == 0) nRes = 8;
 //P1.7输出低电平
 P1OUT &= ~(BIT4);
 nP10 = P1IN & BIT0;
 if (nP10 == 0) nRes = 1;
 nP11 = P1IN & BIT1;
 if (nP11 == 0) nRes = 2;
 nP12 = P1IN & BIT2;
 if (nP12 == 0) nRes = 3;
 nP13 = P1IN & BIT3;
 if (nP13 == 0) nRes = 4;

 P1OUT = 0x00;//恢复以前值。

 //读取各个管脚的状态
 nP10 = P1IN & BIT0;
 nP11 = P1IN & BIT1;
 nP12 = P1IN & BIT2;
 nP13 = P1IN & BIT3;
 for(;;)
 {
  if(nP10 == 1 && nP11 == 1 && nP12 == 1 && nP13 == 1)
  {
   //等待松开按键
   break;
  }
 }

 return nRes;
}

// 处理来自端口 1 的中断
interrupt [PORT1_VECTOR] void PORT_ISR(void)
{
  unsigned char i;
 Delay();
 KeyProcess();
 key_act(unsigned char i);
    if(P1IFG & BIT0)
    {     
     P1IFG &= ~(BIT0);// 清除中断标志位
    }
    if(P1IFG & BIT1)
    {
     P1IFG &= ~(BIT1);// 清除中断标志位
    }
    if(P1IFG & BIT2)
    {
     P1IFG &= ~(BIT2);// 清除中断标志位
    }
 if(P1IFG & BIT3)
    {
     P1IFG &= ~(BIT3);// 清除中断标志位
    }
}
/*void Init_CLK(void)
{
    unsigned int i;
    BCSCTL1 = 0X00;   //将寄存器的内容清零
     //XT2震荡器开启
     //LFTX1工作在低频模式
     //ACLK的分频因子为1
     
    do 
    {
 IFG1 &= ~OFIFG;                       // 清除OSCFault标志
 for (i = 0x20; i > 0; i--);                
    }
    while ((IFG1 & OFIFG) == OFIFG);      // 如果OSCFault =1   
     
    BCSCTL2 = 0X00;   //将寄存器的内容清零
    BCSCTL2 += SELM1;  //MCLK的时钟源为TX2CLK，分频因子为1
    BCSCTL2 += SELS;  //SMCLK的时钟源为TX2CLK，分频因子为1
}
*/
/******************************************************************************/
//按键处理程序
/******************************************************************************/
void key_act(void)
{
  switch(i)
  {
   case 1:
     CO2setpoint();                   //CO2浓度设置
     break;
   case 2:
     CO2deadband();
     break;
   case 3:
     CO2calibrate();
     break;
   case 4:
     tempsetpoint();
     break;
   case 5:
     T_max();
     break;
   case 6:
     tempdeadband();
     break;
   case 7:
     tempcalibrate();
     break;
   case 8:
     mode();
     break;
   case 9:
     cancel();
     break;
   case 10:
     restrore_factory();
     break;
   case 11:
     confirm();
     break;
   case 12:
     UP();
     break;
   case 13:
     Down();
     break;
   case 14:
     time();
     break;
   case 15:
     break;
   case 16:
     break;
  }
  key_value = 0;
}
void CO2setpoint(void)
{
  
}
void CO2deadband(void)
{
  
}
void CO2calibrate(void)
{
  
}
void tempsetpoint(void)
{
  
}
void tempdeadband(void)
{
  
}
void tempcalibrate(void)
{
  
}
void mode(void)
{
  
}
void T_max(void)
{
  
}
void cancel(void)
{
  
}
void restrore_factory(void)
{
  
}
void confirm(void)
{
  
}
void UP(void)
{
  
}
void Down(void)
{
  
}
void time(void)
{
  
}