使用 SerialTransfer 库通过 UART 接收从 nodemcu 发送到 Arduino UNO 的有效负载中的所有零

如何解决使用 SerialTransfer 库通过 UART 接收从 nodemcu 发送到 Arduino UNO 的有效负载中的所有零

我使用 SerialTransfer.h 通过 UART 将 nodemcu 主控流传感器值传输到 Arduino Uno 从站。我已经使用 SoftwareSerial.h 在 Arduino 数字引脚 2、3 上为 Rx、Tx 设置了一个额外的串行端口。我已将 nodemcu 上的 Tx 连接到 Uno 上的 Rx，将 nodemcu 上的 Rx 连接到 Uno 上的 Tx。我有一个电平转换器来调整 3.3 V nodemcu 和 5 V Arduino。我确保提供一个共同点。

我从 nodemcu 传输一个带有传感器值（bool 和 int 类型，硬编码用于演示）的结构，但在 Arduino 上只接收零值，如串行监视器所示。我的代码如下。我很感激任何输入。

我已经尝试了以下没有区别。

1. 在使用 SoftwareSerial.h 创建的 Uno 上有或没有额外的串行端口
2. 使用 Arduino Uno 主站和 nodemcu 从站反转设置
3. nodemcu Tx 和 Arduino Uno Rx 上有和没有电平转换器

这里是 nodemcu master 的代码。

#include <Wire.h>
#include <SerialTransfer.h>

SerialTransfer masterMCU;

struct PAYMASTER {
  /*
  water: instruction to switch pump on or off. Note the float sensor in pump's circuit will prevent overflow.
  fan: instruction to control fan speed - LO,MED,HIGH. Note PC fan requires an int between 0 and 255.
  led: instruction to control LED brightness. Note that the FastLED library requires an int between 0 and 255.
  */
  bool water;
  int fan; 
  int led;
} instructions = {
  true,201,60
};

void setup() {
  // put your setup code here,to run once:
  Serial.begin(9600);
  delay(999);
  masterMCU.begin(Serial);
  delay(999);
}

void debug() {
  Serial.print("MASTER: ");
  Serial.print(millis());
  Serial.print("   Water: ");
  Serial.print(instructions.water);
  Serial.print(",Fan: ");
  Serial.print(instructions.fan);
  Serial.print(",LED: ");
  Serial.println(instructions.led);
}

void loop() {
  // put your main code here,to run repeatedly:
  masterMCU.txObj(instructions,sizeof(instructions));
  masterMCU.sendData(sizeof(instructions));
  debug();
  delay(999);

}

这是Arduino Uno slave的代码。

#include <Wire.h>
#include <SerialTransfer.h>
#include <SoftwareSerial.h>

SerialTransfer slaveMCU;
SoftwareSerial extra(2,3); // Rx 2,Tx 3

struct PAYMASTER {
  /*
  water: instruction to switch pump on or off. Note the float sensor in pump's circuit will prevent overflow.
  fan: instruction to control fan speed - LO,HIGH. Note PC fan requires an int between 0 and 255.
  led: instruction to control LED brightness. Note that the FastLED library requires an int between 0 and 255.
  */
  bool water;
  int fan; 
  int led;
} instructions;

void setup() {
  // put your setup code here,to run once:
  Serial.begin(9600);
  delay(201);
  extra.begin(9600);
  delay(201);
  slaveMCU.begin(extra);
  delay(201);
}

void debug() {
  Serial.print("SLAVE: ");
  Serial.print(millis());
  Serial.print("   Water: ");
  Serial.print((bool)instructions.water);
  Serial.print(",to run repeatedly:
  if (slaveMCU.available()) {
    slaveMCU.rxObj(instructions,sizeof(instructions));
    debug();
  } else if (slaveMCU.status < 0) {
    Serial.print("ERROR: ");

    if(slaveMCU.status == -1)
      Serial.println(F("CRC_ERROR"));
    else if(slaveMCU.status == -2)
      Serial.println(F("PAYLOAD_ERROR"));
    else if(slaveMCU.status == -3)
      Serial.println(F("STOP_BYTE_ERROR"));
  }
  delay(999);
}

解决方法

我进行了一些更改，现在收到的数据具有正确的值。

1. 我在 master 中用 delay() 替换了 millis()。
2. 我在 master 中用 SerialTransfer::sendData() 替换了 SerialTransfer::sendDatum()。前者用于流式传输多个对象，而后者用于流式传输单个对象。
3. 我将结构体中的 int 类型替换为 uint8_t，该结构体通过主从设备的线路发送。

现在 Arduino Uno 可以正确接收这些值。在上述 3. 之前，所有更改都没有任何区别。我保留了其他更改，因为它们对结果也很重要。这是用于从 nodemcu master 到 Arduino Uno slave 正确传输和接收对象的最终代码。

nodemcu 大师：

#include <Wire.h>
#include <SerialTransfer.h>

SerialTransfer masterMCU;
unsigned long tic = millis();
unsigned long toc = tic;

#define DELTA 1000

struct PAYMASTER {
  /*
  water: instruction to switch pump on or off. Note the float sensor in pump's circuit will prevent overflow.
  fan: instruction to control fan speed - LO,MED,HIGH. Note PC fan requires an int between 0 and 255.
  led: instruction to control LED brightness. Note that the FastLED library requires an int between 0 and 255.
  */
  bool water;
  uint8_t fan; 
  uint8_t led;
} instructions = {
  true,201,60
};

void setup() {
  // put your setup code here,to run once:
  Serial.begin(9600);
  delay(999);
  masterMCU.begin(Serial);
  delay(999);
}

void debug() {
  Serial.print("MASTER: ");
  Serial.print(millis());
  Serial.print("   Water: ");
  Serial.print(instructions.water);
  Serial.print(",Fan: ");
  Serial.print(instructions.fan);
  Serial.print(",LED: ");
  Serial.println(instructions.led);
}

void loop() {
  // put your main code here,to run repeatedly:
  toc = millis();
  if ((toc - tic) > DELTA) {
    masterMCU.txObj(instructions,sizeof(instructions));
    masterMCU.sendDatum(instructions),sizeof(instructions);
    debug();
    tic = toc;
  }

}

Arduino Uno slave：

#include <Wire.h>
#include <SerialTransfer.h>
#include <SoftwareSerial.h>

SerialTransfer slaveMCU;
SoftwareSerial Extra(2,3); // Rx: 2,Tx: 3
unsigned long tic = millis();
unsigned long toc = tic;

struct PAYMASTER {
  /*
  water: instruction to switch pump on or off. Note the float sensor in pump's circuit will prevent overflow.
  fan: instruction to control fan speed - LO,HIGH. Note PC fan requires an int between 0 and 255.
  led: instruction to control LED brightness. Note that the FastLED library requires an int between 0 and 255.
  */
  bool water;
  uint8_t fan; 
  uint8_t led;
} instructions;

void setup() {
  // put your setup code here,to run once:
  Serial.begin(9600);
  delay(201);
  Extra.begin(9600);
  delay(201);
  slaveMCU.begin(Extra);
  delay(201);
}

void debug() {
  Serial.print("SLAVE: ");
  Serial.print(millis());
  Serial.print("   Water: ");
  Serial.print((bool)instructions.water);
  Serial.print(",to run repeatedly:
  if (slaveMCU.available()) {
    slaveMCU.rxObj(instructions);
    debug();
  } else if (slaveMCU.status < 0) {
    Serial.print("ERROR: ");

    if(slaveMCU.status == -1)
      Serial.println(F("CRC_ERROR"));
    else if(slaveMCU.status == -2)
      Serial.println(F("PAYLOAD_ERROR"));
    else if(slaveMCU.status == -3)
      Serial.println(F("STOP_BYTE_ERROR"));
  }
}