Arduino和Raspberry pi3之间的串行通信

Question

我正在 Arduino 和 Raspberry pi3 之间进行射频通信。这是我的 Arduino 代码，它与 raspberry pi3 连接，它从其他 RF 模块接收 RF 值。

#include <nRF24L01.h>
#include <RF24.h>
#include <RF24_config.h>
#include <SPI.h>
char msg[10];
RF24 radio(7,8);
const uint64_t pipe = 0x0a0c0a0c0aLL;
int lastmsg = 1;
String theMessage = "";
void setup(void){
  Serial.begin(9600);
  radio.begin();
  radio.openReadingPipe(1,pipe);
  radio.startListening();
}
void loop(void){
  if (radio.available()){
    bool done = false;  
      done = radio.read(msg, 1); 
      char theChar = msg[0];
      if (msg[0] != 2){
        theMessage.concat(theChar);
        }
      else {
       Serial.println(theMessage);
       theMessage= ""; 
      }
   }
}

下面是我的 Python 代码

import serial
import time
# array
rf_array = ["RFID :"]

# Serial Communication
#port = "/dev/ttyACM2"
port = "/dev/ttyACM0"
# /dev/ttyACM2 is rfid Arduino
brate = 9600
arduino8 = serial.Serial(port, baudrate=brate, timeout=None)

while True:
    try:
        print("start")
        #arduino8 = serial.Serial(port, baudrate=brate, timeout=None)
        print("start1")
        data = arduino8.readline()
        print("start2")
        str = data[:-2].decode()
        str = str[:1]
        # str = int(str)
        rf_array.append(str)
        rf_array = list(set(rf_array))
        print(rf_array)


    except:
        print("no value")

当 RF 模块位于我的 RF 模块接收器附近时它起作用但问题是我的射频模块接收器附近没有射频模块我发现 data= arduino8.readline() 是个问题。因为没有arduino8的数据。所以它不会转到下一行。我知道问题所在，但我不知道如何解决。如果你能帮助我，我真的很感激。谢谢

Answer 1

将 readline 与 Python 串行使用时 documentation 状态

Be carefully when using readline(). Do specify a timeout when opening the serial port otherwise it could block forever if no newline character is received. Also note that readlines() only works with a timeout. readlines() depends on having a timeout and interprets that as EOF (end of file). It raises an exception if the port is not opened correctly.

这就是您在打开端口时在 python 代码中看到的内容

arduino8 = serial.Serial(port, baudrate=brate, timeout=None)

您应该将超时设置为一个合理的值，例如 1 秒或更长时间，具体取决于您的使用情况，以便库在一段时间后放弃等待。

Arduino和Raspberry pi3之间的串行通信

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