使循环继续，直到完成目标

Question

我需要能够找到5个连续的EEPROM存储器位，理想情况下最接近2（因为我有位＃1 & 2与其他数据相关联，并希望保持组织）。我开发了可以工作的代码，但for循环在找到一组好的数字后继续执行。

Serial.println("got to assignment number finder"); 
for (int AssignCheck = 2; AssignCheck < 250; AssignCheck++){ 
    Serial.println("Finding a good assignment number " + String(AssignCheck)); 
    if (EEPROM.read(AssignCheck) == 255){   //Looks for a blank space which can be used to store the new card 
    if (EEPROM.read(AssignCheck + 1) == 255){ 
     if (EEPROM.read(AssignCheck + 2) == 255){ 
     if (EEPROM.read(AssignCheck + 3) == 255){ 
      if (EEPROM.read(AssignCheck + 4) == 255){ 
      Serial.println("Found assignment numbers " + String(AssignCheck) + " through to " + String(int(AssignCheck) + 4) + ". Scanner value = " + String(Scanner)); 
      int StoreValue = AssignCheck; 
      } 
     } 
     } 
    } 
    } 
} 

我当时以为我可以把while循环它周围，并有while循环停止，一旦一个变量被设置为0而不是1，所以我写了这个：（注意引进while循环，变量和中间的Scanner = 0一行）。

Serial.println("got to assignment number finder"); 
int Scanner = 1; 
while (Scanner == 1){ 
    for (int AssignCheck = 2; AssignCheck < 250; AssignCheck++){ 
    Serial.println("Finding a good assignment number " + String(AssignCheck) + ". Scanner value = " + String(Scanner)); 
    if (EEPROM.read(AssignCheck) == 255){   //Looks for a blank space which can be used to store the new card 
     if (EEPROM.read(AssignCheck + 1) == 255){ 
     if (EEPROM.read(AssignCheck + 2) == 255){ 
      if (EEPROM.read(AssignCheck + 3) == 255){ 
      if (EEPROM.read(AssignCheck + 4) == 255){ 
       Scanner = 0; 
       Serial.println("Found assignment numbers " + String(AssignCheck) + " through to " + String(int(AssignCheck) + 4) + ". Scanner value = " + String(Scanner)); 
       int StoreValue = AssignCheck; 
      } 
      } 
     } 
     } 
    } 
    } 
} 

它正确地识别并设置变量为0时，我想，但while循环似乎并没有产生影响，并继续循环，产生套可能工作的数字。

作为一个新手编码器，我不知道接下来我可以尝试什么。

任何意见将不胜感激。

Answer 1

在这种情况下，你可以使用指令break：

Serial.println("got to assignment number finder"); 
for (int AssignCheck = 2; AssignCheck < 250; AssignCheck++){ 
    Serial.println("Finding a good assignment number " + String(AssignCheck)); 
    if (EEPROM.read(AssignCheck) == 255){   //Looks for a blank space which can be used to store the new card 
    if (EEPROM.read(AssignCheck + 1) == 255){ 
     if (EEPROM.read(AssignCheck + 2) == 255){ 
     if (EEPROM.read(AssignCheck + 3) == 255){ 
      if (EEPROM.read(AssignCheck + 4) == 255){ 
      Serial.println("Found assignment numbers " + String(AssignCheck) + " through to " + String(int(AssignCheck) + 4) + ". Scanner value = " + String(Scanner)); 
      int StoreValue = AssignCheck; 
      break; 
      } 
     } 
     } 
    } 
    } 
} 

正如你可以阅读here，它正是你想要的。

请注意，你的第二个尝试不起作用，因为for loop是while里面：它完成整个for loop之前和之后，比较它的while loop

的“扫描仪”变量你可以纠正它以这样的方式

Serial.println("got to assignment number finder"); 
int Scanner = 1; 
for (int AssignCheck = 2; (AssignCheck < 250) && (Scanner == 1); AssignCheck++){ 
    Serial.println("Finding a good assignment number " + String(AssignCheck) + ". Scanner value = " + String(Scanner)); 
    if (EEPROM.read(AssignCheck) == 255){   //Looks for a blank space which can be used to store the new card 
    if (EEPROM.read(AssignCheck + 1) == 255){ 
     if (EEPROM.read(AssignCheck + 2) == 255){ 
     if (EEPROM.read(AssignCheck + 3) == 255){ 
      if (EEPROM.read(AssignCheck + 4) == 255){ 
      Scanner = 0; 
      Serial.println("Found assignment numbers " + String(AssignCheck) + " through to " + String(int(AssignCheck) + 4) + ". Scanner value = " + String(Scanner)); 
      int StoreValue = AssignCheck; 
      } 
     } 
     } 
    } 
    } 
} 

Answer 2

读EEPROM是昂贵的，请考虑一下：

Serial.println("got to assignment number finder"); 
int Scanner = 1; 
char rollingBuffer[5]; 
rollingBuffer[0] = EEPROM.read(2 + 0); 
rollingBuffer[1] = EEPROM.read(2 + 1); 
rollingBuffer[2] = EEPROM.read(2 + 2); 
rollingBuffer[3] = EEPROM.read(2 + 3); 
rollingBuffer[4] = EEPROM.read(2 + 4); 
pointRoll = 0; 
for (int AssignCheck = 7; (AssignCheck < 255); AssignCheck++) 
{ 
    if ((rollingBuffer[0] == 255) && (rollingBuffer[1] == 255) && (rollingBuffer[2] == 255) && (rollingBuffer[3] == 255) && (rollingBuffer[4] == 255)) 
    { 
     Serial.println("Found assignment numbers " + String(AssignCheck-5) + " through to " + String(int(AssignCheck-1)) + ". Scanner value = " + String(Scanner)); 
     int StoreValue = AssignCheck; 
     break; 
    } 
    rollingBuffer[pointRoll] = EEPROM.read(AssignCheck); 
    pointRoll++; 
    if (pointRoll > 4) pointRoll = 0; 
}