How to resolve the error: ‘yield’ was not declared in this scope from DallasTemperature library (Arduino)

Question

我正在尝试从我的温度传感器收集温度，但我遇到了这个错误：

/home/myuser/sketchbook/libraries/DallasTemperature/DallasTemperature.cpp: In member function ‘void DallasTemperature::blockTillConversionComplete(uint8_t)’: /home/myuser/sketchbook/libraries/DallasTemperature/DallasTemperature.cpp:446:13: error: ‘yield’ was not declared in this scope yield(); ^

/home/myuser/sketchbook/libraries/DallasTemperature/DallasTemperature.cpp: In member function ‘bool DallasTemperature::recallScratchPad(const uint8_t*)’: /home/myuser/sketchbook/libraries/DallasTemperature/DallasTemperature.cpp:543:11: error: >‘yield’ was not declared in this scope yield();

这是我的代码，基于 https://www.instructables.com/id/How-to-use-DS18B20-Temperature-Sensor-Arduino-Tuto/ :

    #include <OneWire.h>
    #include <DallasTemperature.h>
    
    #define ONE_WIRE_BUS 8
    
    OneWire oneWire(ONE_WIRE_BUS);
    DallasTemperature tempSensor(&oneWire);
    
    void setup()
    {
      Serial.begin(9600);
    }
    
    void loop()
    {
      tempSensor.requestTemperatures();
      float temperatureC = tempSensor.getTempCByIndex(0);
      Serial.println(temperatureC);
    }

库版本：

OneWire-2.3.5
达拉斯气温-3.9.0
（我当然尝试重新导入它们）

DallasTemperature.cpp 中的代码，错误似乎是指：

// Sends command to one or more devices to recall values from EEPROM to scratchpad
// If optional argument deviceAddress is omitted the command is send to all devices
// Returns true if no errors were encountered, false indicates failure
bool DallasTemperature::recallScratchPad(const uint8_t* deviceAddress) {
  
  if (_wire->reset() == 0)
    return false;
  
  if (deviceAddress == nullptr)
    _wire->skip();
  else
    _wire->select(deviceAddress);
  
  _wire->write(RECALLSCRATCH,parasite);

  // Specification: Strong pullup only needed when writing to EEPROM (and temp conversion)
  unsigned long start = millis();
  while (_wire->read_bit() == 0) {
    // Datasheet doesn't specify typical/max duration, testing reveals typically within 1ms
    if (millis() - start > 20) return false;
    yield();
  }
  
  return _wire->reset() == 1;
  
}

我来这里是因为我在 Google...

上没有发现涉及“yield()”和 DallasTemperature 的错误

Answer 1

有些平台没有实现 yield 因此您可以从库的代码中删除对它的调用。调用yield将控制权交给其他任务，如果你没有其他任务，反正是多余的。

删除它可以通过在文件顶部提供一个空的实现来完成。

如果你确定你的主板应该支持它。您可能使用了错误的软件堆栈。尝试下载 official Arduino IDE.

Answer 2

DallasTemperature-3.9.0 于 2020-09-02 发布，我的项目有点老，我第一次创建它之前就无法完成。我使用的是 3.8.0 版本，我 re-installed 它再次运行。

How to resolve the error: ‘yield’ was not declared in this scope from DallasTemperature library (Arduino)

How to resolve the error: ‘yield’ was not declared in this scope from DallasTemperature library (Arduino)

c

c++

arduino