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32 bit data transmitt through rs232 protocol
von Hari29 H. (Company: google) (hari29) Flattr this

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I am new in VHDL programming. I have an output of counter of 32-bit 
data. Now I want to transmit the 32 bit through the rs232 protocol which 
can send 8-bit data once. I am attaching my UART file, DCFIFO of 32 to 
8-bit mix file baud rate generator file and the counter file. Can 
anybody help me how to port map them to get 32-bit data transmitted?

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Re: 32 bit data transmitt through rs232 protocol
von Duke Scarring (Guest)

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I would suggest a state machine to control the transmisson:
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type transmit_state_t is (IDLE, BYTE0, BYTE1, BYTE2, BYTE3, STOP);

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constant STX : natural := 2;    -- start of text

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constant ETX : natural := 3;    -- end of text

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...

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tx_enable      <= '0';

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case transmit_state is

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    when IDLE =>

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        if new_data then

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            tx_enable      <= '1';

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            tx_data        <= to_unsigned( STX, tx_data'length);

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            transmit_state <= BYTE0;

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        end if;

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    when BYTE0 =>

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         tx_enable      <= '1';

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         tx_data        <= data( 7 downto 0);

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         transmit_state <= BYTE1;

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...

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    when STOP =>

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         tx_enable      <= '1';

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         tx_data        <= to_unsigned( ETX, tx_data'length);

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         transmit_state <= IDLE;

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end case;

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...


I add STX and ETX to get a chance to synchronice the whole sequence on 
the receiver.

Duke

  


  




  

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        Hari29 H.
            (Company: google)
        (hari29)
        
      
      

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Thank you very much for your kind help.

  


  




  

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