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???
02/20/10 21:02
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 		 #173371 - MIDI/DMX
Responding to: ???'s previous message
The device I'm building is a Midi Footcontroller which can be expanded with different modules.
These modules have extra switches and leds. About 12 per module.
My idea was to put a microcontroller in each module in I2C slave mode.
This micro reads / debounces the switches and sends the status to the main controller when asked.
This is about every 50ms

Midi isn't usefull because it has a lot of overhead. It would also require a second UART which isn't my first choice.

When using a second UART the best thing to do would be to use RS485 with a simple protocol. Figuring out where to put the terminations is the next step. Since 1 or two modules can be connected to the main unit the terminations have to be switchable.

I2C seems a lot easier.








List of 31 messages in thread
TopicAuthorDate
Bus between modules            01/01/70 00:00      
   Questions            01/01/70 00:00      
      RS-485?            01/01/70 00:00      
         RS-485 or CAN would both work            01/01/70 00:00      
      Answers to questions            01/01/70 00:00      
         Check sum not good enough            01/01/70 00:00      
            Noise            01/01/70 00:00      
               has to work is on stage (music).            01/01/70 00:00      
                  MIDI/DMX            01/01/70 00:00      
                     capacitance, capacitance, capacitance            01/01/70 00:00      
                        I2C feasible ....            01/01/70 00:00      
         Replies to quesitons in answers!            01/01/70 00:00      
         UART            01/01/70 00:00      
            SPI-to-UART with Drivers!            01/01/70 00:00      
               A confession            01/01/70 00:00      
            Not necessarily            01/01/70 00:00      
               Controller type            01/01/70 00:00      
                  I just have [not] decided yet.            01/01/70 00:00      
                     Chips with two UARTS            01/01/70 00:00      
                         not true            01/01/70 00:00      
                           P89LPC952            01/01/70 00:00      
                              Let's assume I'm going to use a UART.            01/01/70 00:00      
                              did you try here?            01/01/70 00:00      
   I2C Could be made to work.            01/01/70 00:00      
      RE: SMBus            01/01/70 00:00      
         so does SMB            01/01/70 00:00      
            For the sake of completeness            01/01/70 00:00      
               not really            01/01/70 00:00      
                  I see            01/01/70 00:00      
                     Timeouts and Hold Times.            01/01/70 00:00      
                        Specifications!            01/01/70 00:00      

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