Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

UART in DE2 board

Hi,

I'm trying to interface the DE2 board with the a pocket printer over

RS-232. It seems like the module requires CTS/RTS hardware flow

control in order to work correctly. I checked the pin assignments at

http://www.altera.com/education/univ/mater...-de2-board.html (http://www.altera.com/education/univ/mater...-de2-board.html)

and it looks like CTS/RTS pins are not there. Does that mean that

this board cannot implement CTS/RTS hardware flow control? Or is there a way to enable it somehow?

Thanks for any help you can provide.

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    18 years ago

    --- Quote Start ---

    originally posted by lili@Mar 26 2007, 10:03 AM

    hi,

    i'm trying to interface the de2 board with the a pocket printer over

    rs-232. it seems like the module requires cts/rts hardware flow

    control in order to work correctly. i checked the pin assignments at

    http://www.altera.com/education/univ/mater...-de2-board.html (http://www.altera.com/education/univ/mater...-de2-board.html)

    and it looks like cts/rts pins are not there. does that mean that

    this board cannot implement cts/rts hardware flow control? or is there a way to enable it somehow?

    thanks for any help you can provide.

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=22518)

    --- quote end ---

    --- Quote End ---

    Not that I&#39;ve checked the schematic for that board but if CTS and RTS are not routed then you will not be able to implement hardware flow control. If you have spare I/O to get at on the board and a level shifter you could manually wire it up. The level shifter will covert the FPGA I/O standard to what RS232 uses (+ or - 12V... I forget).