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05/26/11 00:35
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 		 #182397 - Use UART
Responding to: ???'s previous message
I have to agree with Andy as to keeping on with a simpler approach. Trying to get direct USB support going on an MCU and getting data to flow back and forth from a PC program of some sort is at least an order of magnitude more complex with USB than it is with using the MCU UART and a PC Comm Port. At least 10X !!

The beauty of either the TTL-232R-3V3 or the TTL-232R-5V cable is that you simply can program the MCU as a UART communicating device. On the PC side you simply load the latest FTDI driver file from their web site and you almost instantly have another Comm port show up in your Windows environment that either standard of custom written communications software can connect to and interact with the MCU on the other end of the USB connection.

I have built multiple things that 'look like USB' devices because the USB cable connects to them but inside I've designed in the same FTDI chip that is fabricated into those cables mentioned above. The MCU programming I've prepared uses the MCU UART at the highest possible baud rate and is able to carry on very efficient packet communications with custom PC based VB6 or VB.NET programs.

Michael Karas


List of 32 messages in thread
TopicAuthorDate
8051 based USB Controller            01/01/70 00:00      
   What? Why?            01/01/70 00:00      
      Actual task            01/01/70 00:00      
         Use one of these            01/01/70 00:00      
   What type of "USB Communication", exactly?            01/01/70 00:00      
      Details            01/01/70 00:00      
         USB Based 8051            01/01/70 00:00      
            Not recommended for new designs            01/01/70 00:00      
   DIP? Unlikely.            01/01/70 00:00      
      What's the solution then            01/01/70 00:00      
         You'll Have to Decide.            01/01/70 00:00      
         switch from the DIP package            01/01/70 00:00      
         SILabs            01/01/70 00:00      
            There are DIP USB devices in MCP 18F series            01/01/70 00:00      
               MCP???            01/01/70 00:00      
                  He's talking about PICs...            01/01/70 00:00      
                     USB dongle            01/01/70 00:00      
   A nice solution            01/01/70 00:00      
      USB Dongle Selection            01/01/70 00:00      
         Wont it require any Converter too            01/01/70 00:00      
            Did you actually bother to study the details at all?            01/01/70 00:00      
            Why Bother ??            01/01/70 00:00      
      Not necessarily so nice            01/01/70 00:00      
         Use UART            01/01/70 00:00      
         There's one important "gotcha" ...            01/01/70 00:00      
      What about the data rate?            01/01/70 00:00      
         Data rate            01/01/70 00:00      
            Can you proceed without knowing the reqirements?            01/01/70 00:00      
               latency            01/01/70 00:00      
               I doubt we ever will            01/01/70 00:00      
                  Trying this solution            01/01/70 00:00      
                     USB MCU DIP Package            01/01/70 00:00      

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