Python 接收串口数据

Question

我正在尝试从 Python 3.6 向 Arduino 发送消息，而 Arduino 需要响应。

目前我可以发送给 Arduino 并且它有响应，但我没有收到完整的消息，而是收到了 1 个字节。

Arduino 代码：

byte FullResponse[] = {0xA1, 0xA3, 0xA4, 0x3B, 0x1F, 0xB4, 0x1F, 0x74, 0x19, 
0x79, 0x44, 0x9C, 0x1F, 0xD4, 0x4A, 0xC0};
byte SerialBuf[11] = {0,0,0,0,0,0,0,0,0,0,0};
int i = 0;

void setup() {
  Serial.begin(115200);
}

void loop() {
//Reads values from the Serial port, if there are any
  for(int i=0; i<=10; i++){
    while(!Serial.available());
    SerialBuf[i] = Serial.read();
  }

//Sends the full response back if EF is the 8th byte
  if(SerialBuf[8] == 0xEF){
     Serial.write(FullResponse, sizeof(FullResponse));
     SerialBuf[8] = 15;
  }
}

Python代码：

## import the serial library
import serial
import time

Response = []
FullResponse = bytes([0xC0, 0x43, 0xA1, 0x04, 0x0A, 0x90, 0x00, 0x30, 0xEF, 0xFF, 0xC0])

## Serial port is 
ser = serial.Serial(port='COM3', baudrate=115200)
time.sleep(2)

#converts values to byte array and sends to arduino
ConArray = bytearray(FullResponse)
ser.write(ConArray[0:len(FullResponse)])
time.sleep(1)    
    
if ser.inWaiting():
    for Val in ser.read():
        Response.append(Val)

print(*Response)        #prints 161
print(len(Response))        #prints 1

time.sleep(1)

## close the port and end the program
ser.close()

从我在 python 代码中留下的评论中可以看出。我没有得到整个值数组，而是只收到 161.

有人对我哪里出错有什么建议吗？

Answer 1

如果您阅读 Serial.read() 函数的 documentation，您会看到它的默认参数是“1”。所以它按预期只从串行端口读取 1 个字节。您应该首先检查（或等到）是否有足够的字节并将要读取的字节数传递给 read() 函数。

Answer 2

通过将 if 语句更改为 while 语句，代码现在可以读取所有保存的字节。谢谢你的帮助嘿哟

## import the serial library
import serial
import time

Response = []
FullResponse = bytes([0xC0, 0x43, 0xA1, 0x04, 0x0A, 0x90, 0x00, 0x30, 0xEF, 0xFF, 0xC0])

## Serial port is 
ser = serial.Serial(port='COM3', baudrate=115200)
time.sleep(2)

#converts values to byte array and sends to arduino
ConArray = bytearray(FullResponse)
ser.write(ConArray[0:len(FullResponse)])
time.sleep(1)    

while ser.inWaiting(): ###########   Changed from if to while
    for Val in ser.read():
        Response.append(Val)

print(*Response)        #prints 161
print(len(Response))        #prints 1

time.sleep(1)

## close the port and end the program
ser.close()

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