[Raspberry Pi]树莓派多线程下串口收发数据

[Raspberry Pi]树莓派多线程下串口收发数据

鼠鼠用的是python开发树莓派，因为python是最优美的语言！

少废话，直接上代码：

import threading
import serial
import cv2

ser = serial.Serial("/dev/ttyAMA0", 115200)
ser.timeout = 5
if not ser.isOpen:
    ser.open()  # 打开串口
startRdFlag = 0
rxBuffer = []
dataUpdateFlag = 0

def comPrint(_string):
    message = _string
    ser.write(message.encode())

def readThread():
    global rxBuffer, dataUpdateFlag
    print("start Read Thread!\n")
    while True:
        if dataUpdateFlag == 0:
            rxBufferLen = ser.inWaiting()
            if rxBufferLen > 0:
                rxBuffer = ser.readline()
                dataUpdateFlag = 1  # 通知主任务有新数据

def mainThread():
    global dataUpdateFlag,rxBuffer
    print("start Main Thread!\n")
    while True:
        ret, frame = cap.read()
        cv2.imshow("frame", frame)

        if dataUpdateFlag == 1: # 有新数据
            # 处理数据
            print(rxBuffer)

            # flag归零
            dataUpdateFlag = 0
            # 处理完数据，开始接收新数据
        cv2.waitKey(5)
    cv2.destroyWindow()

if __name__ == '__main__':
    thread1 = threading.Thread(target=mainThread)
    thread2 = threading.Thread(target=readThread)

    thread1.start()
    thread2.start()