使用wiringPi与中断和液晶显示器同时使用

问题描述：

我不熟悉Linux上的C++编程。我尝试使用旋转编码器来控制液晶显示器上的数值。根据所使用的wiringPi安装例程，只能使用中断或LCD工作，但不能同时使用两者。我导出所有nessersary GPIO，以便不需要sudo。使用wiringPi与中断和液晶显示器同时使用

#Interrupt Pins Encoder 
gpio edge 23 both 
gpio edge 24 both 
gpio mode 4 up 
gpio mode 5 up 

#Pins LCD 
gpio export 17 out 
gpio export 18 out 
gpio export 27 out 
gpio export 22 out 
gpio export 8 out 
gpio export 7 out

这里的C++代码：

#include <wiringPi.h> 
#include <lcd.h> 
#include <stdio.h> 

#define A 23 
#define B 24 

char a = 0; 
char b = 0; 
const char a1 = 1, a2 = 2, a3 = 3, b1 = 4, b2 = 5, b3 = 6; 
char state = 0; 

volatile int counter = 0; 
volatile int counter_l = 0; 
void interrupt(); 

int main(void) 
{ 
    printf("wiringPiSetup\n"); 
    //wiringPiSetupSys(); //Interrupts working 
    wiringPiSetup(); //LCD working 

    pinMode(17, OUTPUT); 
    pinMode(18, OUTPUT); 
    pinMode(27, OUTPUT); 
    pinMode(22, OUTPUT); 
    pinMode(8, OUTPUT); 
    pinMode(7, OUTPUT); 

    int fd = lcdInit(2, 16, 4, 11, 10, 0, 1, 2, 3, 0, 0, 0, 0); 
    lcdClear(fd); 
    lcdPosition(fd, 0, 0); 
    lcdPrintf(fd,"Test"); 

    wiringPiISR(A, INT_EDGE_BOTH, &interrupt); 
    wiringPiISR(B, INT_EDGE_BOTH, &interrupt); 

    pinMode(A, INPUT); 
    pinMode(B, INPUT); 

    while (true) 
    { 
     if (counter != counter_l) 
     { 
      counter_l = counter; 
      printf("%i\n", counter); 
      lcdPosition(fd, 0, 0); 
      lcdPrintf(fd, "%i ", counter); 
     } 
    } 
    return 0; 
} 

void interrupt(){ 
    a = !digitalRead(A); 
    b = !digitalRead(B); 
    switch (state) 
    { 
    case a1: 
     if (!a) 
      state = 0; 
     else if (b) 
      state = a2; 
     break; 
    case a2: 
     if (!a&&b) 
      state = a3; 
     else if (a&&!b) 
      state = a1; 
     break; 
    case a3: 
     if (a&&b) 
      state = a2; 
     else if (!a&&!b) { 
      state = 0; 
      counter++; 
     } 
     break; 
    case b1: 
     if (!b) 
      state = 0; 
     else if (a) 
      state = b2; 
     break; 
    case b2: 
     if (!b&&a) 
      state = b3; 
     else if (b&&!a) 
      state = b1; 
     break; 
    case b3: 
     if (b&&a) 
      state = b2; 
     else if (!b&&!a) { 
      state = 0; 
      counter--; 
     } 
     break; 
    default: 
     if (a&&b) 
      state = 0; 
     else if (a) 
      state = a1; 
     else if (b) 
      state = b1; 
     break; 
    } 
}

现在的问题是，为什么它behaives这样的，有什么可以/我应该怎么做。

答

我发现了与设置功能一起使用的不同编号的解决方案。 WirinpPi有自己的Pin编号，并有原生的BCM编号。解决方法是将lcdInit函数中的编号更改为BCM编号。

     //wiringPi Nr. 
pinMode(17, OUTPUT); //0 
pinMode(18, OUTPUT); //1 
pinMode(27, OUTPUT); //2 
pinMode(22, OUTPUT); //3 
pinMode(8, OUTPUT);  //10 
pinMode(7, OUTPUT);  //11 

//int fd = lcdInit(2, 16, 4, 11, 10, 0, 1, 2, 3, 0, 0, 0, 0); //wiringPi Nr. 
int fd = lcdInit(2, 16, 4, 7, 8, 17, 18, 27, 22, 0, 0, 0, 0); //BCM Nr.

使用wiringPi与中断和液晶显示器同时使用

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