从PySerial发送整数值的Arduino [英] Sending integer values to Arduino from PySerial

问题描述

我需要发送的整数大于255？有谁知道如何做到这一点？

I need to send integers greater than 255? Does anyone know how to do this?

推荐答案

下面是如何（感谢您的想法，亚历克斯！）：

Here's how (Thanks for the idea, Alex!):

的Python：

def packIntegerAsULong(value):
    """Packs a python 4 byte unsigned integer to an arduino unsigned long"""
    return struct.pack('I', value)    #should check bounds

# To see what it looks like on python side
val = 15000
print binascii.hexlify(port.packIntegerAsULong(val))

# send and receive via pyserial
ser = serial.Serial(serialport, bps, timeout=1)
ser.write(packIntegerAsULong(val))
line = ser.readLine()
print line

Arduino的：

Arduino:

unsigned long readULongFromBytes() {
  union u_tag {
    byte b[4];
    unsigned long ulval;
  } u;
  u.b[0] = Serial.read();
  u.b[1] = Serial.read();
  u.b[2] = Serial.read();
  u.b[3] = Serial.read();
  return u.ulval;
}
unsigned long val = readULongFromBytes();
Serial.print(val, DEC); // send to python to check

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