MTouch 用PIC16F883开发的4个按键

使用PIC16F883开发的4键触摸控制器

最新推荐文章于 2021-09-12 23:39:37 发布

wuwoolley

最新推荐文章于 2021-09-12 23:39:37 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/wuwoolley/article/details/3931976

这篇博客详细介绍了如何利用PIC16F883单片机开发一个4键触摸控制模块。通过配置定时器、中断、IO口，实现了按键的触摸感应，并通过平均值算法来确定按键是否被按下。每个按键的状态通过LED灯进行显示，程序中还包含了初始化设置、中断服务函数和按键状态处理逻辑。

#include <pic.h>

__CONFIG(INTIO & WDTDIS & PWRTEN & MCLRDIS & UNPROTECT & BORDIS);
const unsigned char COMP1[4] = {0x94, 0x95, 0x96, 0x97};
const unsigned char COMP2[4] = {0xA0, 0xA1, 0xA2, 0xA3};
#define NUM_BTTNS   4
#define ON     0
#define OFF     1
#define AVG_DELAY   16
#define PCT_ON  65
#define PCT_OFF  60
#define PCT_AVG  18

#define TRISC2OUT   TRISA5
#define TRISC2OUT   TRISA5
#define TRISC12IN0   TRISA0
#define TRISC12IN1   TRISA1
#define TRISC12IN2   TRISB3
#define TRISC12IN3   TRISB1

#define LED1 RC1
#define LED2 RC2
#define LED3 RB4
#define LED4 RB5
#define SPA RB0///090217
#define TRISSPK TRISB0//090217
#define TRISLED1 TRISC1
#define TRISLED2 TRISC2
#define TRISLED3 TRISB4
#define TRISLED4 TRISB5
unsigned char index;
long percent;
unsigned int RAW[NUM_BTTNS];

unsigned int AVERAGE[NUM_BTTNS];
unsigned char INDEX;
unsigned char first;
unsigned int value;

#define B1   0
#define B2 1
#define B3   2
#define B4   3

typedef struct {
     char B11 :1;
     char B22 :1;
     char B33 :1;
     char B44 :1;
    }BButtons;

BButtons Buttons;
void Abit_init(void);
void Abit_capinit(void);
void Abit_restart_timers(void);
void interrupt isr(void);
void Abit_next_channel(void);
void AbitDisplayLEDs(char i);
void AbitDisunplayLEDs(char i);

void main(void)
{
Abit_init();
LED1=OFF;
LED2=OFF;
LED3=OFF;
LED4=OFF;
SPA=OFF;
while(1)
{
  Buttons.B11==1 ? AbitDisplayLEDs(0):AbitDisunplayLEDs(0);
  Buttons.B22==1 ? AbitDisplayLEDs(1):AbitDisunplayLEDs(1);
  Buttons.B33==1 ? AbitDisplayLEDs(2):AbitDisunplayLEDs(2);
  Buttons.B44==1 ? AbitDisplayLEDs(3):AbitDisunplayLEDs(3);
}
}
void Abit_init(void)
{
TRISC2OUT=0;
TRISC12IN0=1;
TRISC12IN1=1;
TRISC12IN2=1;
TRISC12IN3=1;
TRISSPK=0;
TRISLED1=0;
TRISLED2=0;
TRISLED3=0;
TRISLED4=0;
Buttons.B11 = 0;
Buttons.B22 = 0;
Buttons.B33 = 0;
Buttons.B44 = 0;
Abit_capinit();
GIE=1;
}
void Abit_restart_timer(void)
{

TMR1L = 0;
TMR1H = 0;
TMR1ON = 1;
TMR0 = 0;
T0IF = 0;
}

void Abit_next_channel(void)
{

INDEX = (++INDEX) & 0x03;
CM1CON0 = COMP1[INDEX];
CM2CON0 = COMP2[INDEX];
}

void Abit_capinit(void)
{
for(INDEX=0;INDEX< NUM_BTTNS;INDEX++)
{
  RAW[INDEX]=0;
  AVERAGE[INDEX]=0;
}
first=50;
OSCCON=0X7F;//内部8M晶振
INDEX=0;
CM1CON0=COMP1[INDEX];
CM2CON0=COMP2[INDEX];
CM2CON1=0X32;
ANSEL=0X05;
ANSELH=0X00;
VRCON   = 0x8d;
SRCON   = 0xF0;
T1CON = 0x06;
OPTION = 0x82;
Abit_restart_timer();
INTCON = 0;
T0IE = 1;
}
void interrupt isr(void)
{
if (T0IF==1 && T0IE==1)
{
  TMR1ON = 0;
  value = TMR1L + (unsigned int)(TMR1H << 8);
  RAW[INDEX]=value;
  if (first > 0)
  {
   first--;
   AVERAGE[INDEX] = value;
   Abit_next_channel();
   Abit_restart_timer();
   return;
  }
  percent=((long)AVERAGE[INDEX]-(long)value);
  if(percent<0)
  {
   percent=0;
  }
  else
  {
   percent=percent*1000;
   percent=percent/AVERAGE[INDEX];
  }

  if (percent > PCT_ON)
  {
   switch (INDEX)
   {
    case B1:  Buttons.B11 = 1; break;
    case B2:  Buttons.B22 = 1; break;
    case B3:  Buttons.B33 = 1; break;
    case B4:  Buttons.B44 = 1; break;
    default: break;
   }

  }
  else if (percent < PCT_OFF)
  {
   switch (INDEX)
   {
    case B1:  Buttons.B11 = 0; break;
    case B2:  Buttons.B22 = 0; break;
    case B3:  Buttons.B33 = 0; break;
    case B4:  Buttons.B44 = 0; break;
    default: break;
   }

  }
  if (value > AVERAGE[INDEX])
  AVERAGE[INDEX] = value;
  if (percent < PCT_AVG)
  {
   if (index< AVG_DELAY)   index++;
   else        index = 0;

   if (index == AVG_DELAY)
   AVERAGE[INDEX] = AVERAGE[INDEX] + ((long)(value) - (long)(AVERAGE[INDEX]))/8;

  }
Abit_next_channel();
Abit_restart_timer();

}

}
void AbitDisplayLEDs(char i)
{
switch (i)
{
  case 0xFF:
  case 0:  LED1 = ON;SPA=ON; break;
  case 1:  LED2 = ON;SPA=ON; break;
  case 2:  LED3 = ON; SPA=ON;break;
  case 3:  LED4 = ON; SPA=ON;break;

  default: break;
}
}
void AbitDisunplayLEDs(char i)
{
switch (i)
{
  case 0xFF:
  case 0:  LED1 = OFF;SPA=OFF; break;
  case 1:  LED2 = OFF;SPA=OFF; break;
  case 2:  LED3 = OFF;SPA=OFF; break;
  case 3:  LED4 = OFF; SPA=OFF;break;

  default: break;
}
}