我能用4箱以上的开关吗？

Question

我正在用Arduino mega 2560编写测试夹具的应用程序，它是基于菜单的程序，我使用的是开关箱，到目前为止我有6种情况，直到4种情况代码正常工作，一旦我进入第5选项或尝试从第5代码访问用例是从开关出来的。我试过用字符和整数变量作为标签，我在第1和第5处复制了第5大小写代码，在第1次中运行良好，我想强调的是，在第5种情况下，语句没有任何问题，这与我可以使用的情况数有关，基本上，每当我想转到第5种情况时，或者在第4种程序脱离开关之后，任何情况下都没有问题。有人能简单介绍一下吗?为了更好的理解，我正在添加串行终端的片段.感谢你的评论和回答

  #include<SPI.h>
//define the SPI and other pins
//SPI: 50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS). for Arduino Mega 2560
#define DATAOUT     51   //mosi
#define DATAIN      50   //miso
#define SPICLOCK    52   //sck
#define TXDSASS     53   //ss
const int RXDSA1SS  =  49;     // to make other digital i/o pins as a SS for multiple SPIs
const int RXDSA2SS  =  48;     // to make other digital i/o pins as a SS for multiple SPIs
const int BPFSS  =  47;       // to make other digital i/o pins as a SS for multiple SPIs
const int POTSS  =  46;       // to make other digital i/o pins as a SS for multiple SPIs

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

  pinMode(DATAOUT,OUTPUT); // to declair the pinMode
  pinMode(DATAIN,INPUT);
  pinMode(SPICLOCK,OUTPUT);
  pinMode(TXDSASS,OUTPUT);
  pinMode(RXDSA1SS,OUTPUT);
  pinMode(RXDSA2SS,OUTPUT);
  pinMode(BPFSS,OUTPUT);
  pinMode(POTSS,OUTPUT);
  
  Serial.println("***Test Jig by Arduino Mega 2560 Welcomes you***");
  
SPI.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("*************Menu*************");
  Serial.println("1.Enter 1 for Tx_DSA");
  Serial.println("2.Enter 2 for Rx_DSA_1");
  Serial.println("3.Enter 3 for Rx_DSA_2");
  Serial.println("4.Enter 4 for TunableBPF");
  Serial.println("5.Enter 5 for Digital TrimPOT");
  //Serial.println("4.Enter 0 to Exit");

  while(Serial.available() == 0) {} //wait till user provide input on serial 
  if(Serial.available())
   {
      int UserInput = Serial.parseInt();
      Serial.println(UserInput);
      switch(UserInput)
      {
      case 1:   //**********Tx_DSA code**************//
             int choice1; 
             Serial.println("Welcome to Tx_DSA");
             do{          
             Serial.println("Enter Tx Attenuation in dB: ");
             while(Serial.available() == 0) {}//wait till user provide input on serial
             float Attn;
             Attn=Serial.parseFloat();
             Serial.print("Entered Tx Attenuation is: ");
             Serial.println(Attn);
             byte AttnToDSA;
             AttnToDSA = DataToSendDSA(Attn);
             Serial.print("DSA resistor to be set in Decimal: "); 
             Serial.println(AttnToDSA);
             //AttnToDSA = AttnToDSA<<2;
             SPI.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE1));
             digitalWrite(TXDSASS,LOW);
             SPI.transfer(AttnToDSA);
             digitalWrite(TXDSASS,HIGH);
             digitalWrite(TXDSASS,LOW);
             Serial.println("Enter 1 for setting Tx_DSA Attenuation");
             Serial.println("Enter 0 for Exit from Tx_DSA");
             while(Serial.available() == 0) {}//wait till user provide input on serial
             choice1 = Serial.parseInt();
             //Serial.println(choice);
             }while(choice1==1);
             break;
      case 2:  //**********Rx_DSA_1 code**************//
             int choice2; 
             Serial.println("Welcome to Rx_DSA_1");
             do{          
             Serial.println("Enter Rx_1 Attenuation in dB: ");
             while(Serial.available() == 0) {}//wait till user provide input on serial
             float Attn;
             Attn=Serial.parseFloat();
             Serial.print("Entered Rx_1 Attenuation is: ");
             Serial.println(Attn);
             byte AttnToDSA;
             AttnToDSA = DataToSendDSA(Attn);
             Serial.print("DSA resistor to be set in Decimal: "); 
             Serial.println(AttnToDSA);
             //AttnToDSA = AttnToDSA<<2;
             SPI.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE1));
             digitalWrite(RXDSA1SS,LOW);
             SPI.transfer(AttnToDSA);
             digitalWrite(RXDSA1SS,HIGH);
             digitalWrite(RXDSA1SS,LOW);
             Serial.println("Enter 1 for setting Rx_DSA_1 Attenuation");
             Serial.println("Enter 0 for Exit from Rx_DSA_1");
             while(Serial.available() == 0) {}//wait till user provide input on serial
             choice2 = Serial.parseInt();
             //Serial.println(choice);
             }while(choice2==1);
             break;
      case 3:  //**********Rx_DSA_2 code**************//
             int choice3; 
             Serial.println("Welcome to Rx_DSA_2");
             do{          
             Serial.println("Enter Rx_2 Attenuation in dB: ");
             while(Serial.available() == 0) {}//wait till user provide input on serial
             float Attn;
             Attn=Serial.parseFloat();
             Serial.print("Entered Rx_2 Attenuation is: ");
             Serial.println(Attn);
             byte AttnToDSA;
             AttnToDSA = DataToSendDSA(Attn);
             Serial.print("DSA resistor to be set in Decimal: "); 
             Serial.println(AttnToDSA);
             //AttnToDSA = AttnToDSA<<2;
             SPI.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE1));
             digitalWrite(RXDSA2SS,LOW);
             SPI.transfer(AttnToDSA);
             digitalWrite(RXDSA2SS,HIGH);
             digitalWrite(RXDSA2SS,LOW);
             Serial.println("Enter 1 for setting Rx_DSA_2 Attenuation");
             Serial.println("Enter 0 for Exit from Rx_DSA_2");
             while(Serial.available() == 0) {}//wait till user provide input on serial
             choice3 = Serial.parseInt();
             //Serial.println(choice);
             }while(choice3==1);
             break;
      case 4:    //**********BPF code**************//
             int choice4;
             word Freq = 0;
             String FreqHex;
             Serial.println("Welcome to TunableBPF");            
             do{ 
                Serial.println("Enter BPF Frequncy: ");
                while(Serial.available() == 0) {}//wait till user provide input on serial  
                Freq = Serial.parseInt();             
                Serial.print("Tx Frequncy: ");
                Serial.println(Freq);
                SPI.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE0));
                digitalWrite(BPFSS,LOW);
                SPI.transfer16(Freq);
                digitalWrite(BPFSS,HIGH);
                FreqHex =  String(Freq, HEX); 
                Serial.print("Frequncy to be set to Tunable Band Pass Filter in HexaDecimal: ");
                Serial.println(FreqHex); 
                Serial.println("Enter 1 for setting BPF Frequency");
                Serial.println("Enter 0 for Exit from BPF");
                while(Serial.available() == 0) {}//wait till user provide input on serial
                choice4 = Serial.parseInt();
               }while(choice4==1);
               break;
       case 5:     //**********Digital TrimPOT code**************//
              int choice5;
              int Voltage;
              SPI.beginTransaction(SPISettings(5000000, MSBFIRST, SPI_MODE0));
              digitalWrite(POTSS,LOW);
              SPI.transfer(0x1082);    //Set default value i.e. 28V in NV register
              SPI.transfer(0x30);      //Copy NV Register to Wiper Register (Default Value: 28V)
              digitalWrite(POTSS,HIGH);
              Serial.println("Welcome to Digital TrimPOT");            
              do{
                 Serial.println("Enter Voltage to set on Digital POT: ");
                 while(Serial.available() == 0) {}//wait till user provide input on serial 
                 Voltage = Serial.parseInt();
                 Serial.print("Entered Voltage: ");
                 Serial.println(Voltage);
                 float R3 = 1.65*((Voltage/1.7)-1);
                    Serial.println(R3);    
                 float RegValue = ((R3/50000)*256)*1000;
                    Serial.println(RegValue);                
                 digitalWrite(POTSS,LOW);
                 SPI.transfer16(RegValue); //Write to Wiper register
                 digitalWrite(POTSS,HIGH);           
                 Serial.print("Register value to be set in Wiper Register: ");
                 Serial.println(RegValue);
                 Serial.println("Enter 1 for setting Digital POT Voltage");
                 Serial.println("Enter 0 for Exit from Digital TrimPOT");
                 while(Serial.available() == 0) {}//wait till user provide input on serial
                 choice5 = Serial.parseInt();                                
               }while(choice5==1);
               break;
        case 6: Serial.println("In 6th case");
              break;
        default: Serial.println("Invalid Entry, Please enter valid choice");
    
      }
      Serial.println("out of Switch");
   
  }
}

int DataToSendDSA(float Attenuation)
 {
   int DSAAttn=0;
   String AttnHex;
     //int Attenuation=Attn;
     int Binary[]={32,16,8,4,2,1};
     float AttnStep[]={16,8,4,2,1,0.5};
     int i;
     for(i=0;i<6;i++)
     {
     if(AttnStep[i]==Attenuation)
      {
        DSAAttn=DSAAttn|Binary[i];
        break;
      }    
     else if(AttnStep[i]<Attenuation)
      {
        DSAAttn=DSAAttn|Binary[i];
        Attenuation=Attenuation-AttnStep[i];
      }
     }
      DSAAttn=DSAAttn<<2;
      AttnHex =  String(DSAAttn, HEX); 
      Serial.print("Attenuation to be set to DSA in HexaDecimal: "); //remove this print after development
      Serial.println(AttnHex); 
    return DSAAttn;
 }

​

​

Answer 1

在一个开关语句中，可以有4种以上的情况。事实上，没有限制，除了你不能有重复的事实。

您的问题是在其他地方，在您的代码中，遗憾的是，您还没有发布。

我不确定这是否是您的问题，但我正在收到编译器警告：

sketch_dec24a:153: error: jump to case label [-fpermissive]

这是由在每个用例标签内声明变量引起的。我建议把它们砌成几块。

  case 3:  //**********Rx_DSA_2 code**************//
         {   // <---- add this
         int choice3; 
         Serial.println("Welcome to Rx_DSA_2");
         ... blah blah ...
         break;
         } // <---- add this

对其中包含变量声明的每个case标签执行此操作。或者，将声明移到开关语句之外。