# mx05v05.py MX05V, FS1000S 433MHz Demo Program v0.5  tlfong01  2021oct24hkt2143
    # Pico GP Pin Assignment
    #   GP0 = UART0 TxD = MX05    433MHz Revciver Module Data Pin
    #   GP1 = UART0 RxD = FS1000D 433MHz Transmit Module Data Pin
    # Setup
    #   To loop back, short TxD pin to RxD pin
    
    from machine import UART, Pin
    import utime
    
    uart0 = UART(0, baudrate = 9600, tx=Pin(0), rx=Pin(1))
    
    def testUartLoopBackV01():
        print('Begin testUartLoopBackV01(), ...')
        testMsg = 'Hello World'
        print('  writeTestMsg =', testMsg)
        uart0.write(testMsg)  # write 5 bytes
        utime.sleep(0.5)
        bytesRead = uart0.read(20) # read up to 5 bytes
        print('  bytes read =', bytesRead)
        print('End   testUartLoopBackV01().')
        return
    
    def testUartLoopBackV02():
        print('Begin testUartLoopBackV02(), ...')
        #testMsg = 'Hello World'
        testBytes = b'\0x5b\0xb5'
        print('  bytes written               =', testBytes)
        uart0.write(testBytes)  
        utime.sleep(0.5)
        bytesRead = uart0.read(20) # 
        print('  bytes read                  =', bytesRead)
        print('  Begin repeat printing bytes =', testBytes)    
        for count in range(100000):
            uart0.write(testBytes)
            utime.sleep(0.01)
        print('  End   repeat printing bytes =', testBytes)        
        print('End   testUartLoopBackV02().')
        return
    
    # *** Main ***
    
    #testUartLoopBackV01()
    testUartLoopBackV02()
    
    
    # .END
    
    ''' *** Sample output ***
    MicroPython v1.16 on 2021-06-18; Raspberry Pi Pico with RP2040
    Type "help()" for more information.
    >>> %Run -c $EDITOR_CONTENT
    Begin testUartLoopBackV02(), ...
      bytes written               = b'\x00x5b\x00xb5'
      bytes read                  = None
      Begin repeat printing bytes = b'\x00x5b\x00xb5'
      End   repeat printing bytes = b'\x00x5b\x00xb5'
    End   testUartLoopBackV02().
    >>> 
    '''