# picoVirtualWireV07.py tlfong01  2021oct25hkt1009
    # Pico GP Pin Assignment
    #   GP0 = UART0 TxD = FS1000S    
    #   GP1 = UART0 RxD = MX05V 
    # Setup
    #   1. To loop back, short TxD pin to RxD pin
    #   2. To test Xmit/Recv, connect GP0 pin to FS1000S (Note 1), GP1 pin to MX05V
    # Note 1
    #   Pico 3V3 Gp0 direct connect to 5V FS1000S, might cause "latching up", and fry Pico.
    # Note 2
    #   Suggestions
    #   1.  Use HCT125 or HC03 to shift 3V3 logical level to 5V.
    #   2.  Use 12V to power FS1000S to increae xmit power and therefore effective distance
    
    from machine import UART, Pin
    import utime
    
    uart0 = UART(0, baudrate = 1200, 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
    
    def testPicoDirectDriveFs1000sV03():
        print('Begin Pico TxD (GP0) direct drive FS1000S, ...')
        testBytes = b'\0x5b\0xb5' 
        for count in range(100000):
            uart0.write(testBytes)
            utime.sleep(0.01)     
        print('End   Pico GP0 direct drive FS1000S.')
        return
    
    def testFs1000sMx05vV04():
        print('Begin testFs1000sMx05vV04(), ...')
        testBytes = b'\0x5b\0xb5'
        print('  bytes written to   GP0 (UART0 TxD), connected to FS1000S               =', testBytes)
        uart0.write(testBytes)  
        utime.sleep(0.5)
        bytesRead = uart0.read(20)  
        print('  bytes read    from GP1 (UART0 RxD), connected to MX05V                 =', bytesRead)      
        print('End testFs1000sMx05vV04().')  
        return
    
    # *** Main ***
    
    #testUartLoopBackV01()
    #testUartLoopBackV02()
    #testPicoDirectDriveFs1000sV03()
    testFs1000sMx05vV04()
    
    # .END
    
    ''' *** Sample output 2021oct25hkt1016 ***
    >>> %Run -c $EDITOR_CONTENT
    Begin testFs1000sMx05vV04(), ...
      bytes written to   GP0 (UART0 TxD), connected to FS1000S               = b'\x00x5b\x00xb5'
      bytes read    from GP1 (UART0 RxD), connected to MX05V                 = b'\x00\xff\xb3~\x10\xdd'
    End testFs1000sMx05vV04().
    >>> 
    '''