Forum Discussion

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

Uart RS232 Nios 1

Hi,

Im using the Apex20ke (EP20k600EBC652) board and i wanted to get familiar with the nios 1. So i create a nios processor and i added to it a ROM for GERMS on chip mem and a RAM on chip mem for the program. And i added two uarts RS232 uarts, a debug uart and one for the std.io. For this part i followed step by step the nios tutorial tt_nios_hw_apex_20k200e.pdf.

So first question is : in my board i have just one RS232 DTE how can use it for the both uarts ?

My second consern is when i tried just to use the debug Uart (nios Tx to the pin AF34 and nios RX to the pin AE34) and i typed the follwing:

nb -b0x4000 hello_world.c

and then

nr -d hello_world.srec

and after that i pressed the button mapped to the nios reset, i didnt get anything it seems that i couldnt upload the program to the board. It keeps displaying the dots.......

1 Reply

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

    Hi,

    I finely found out. The clock speed that i specified for the nios clock was different from the clock that used. And that's why the UART didnt work!! pretty simple right ! ?

    oh well ..

    --- Quote Start ---

    originally posted by linearb@Feb 11 2006, 03:29 AM

    hi,

    im using the apex20ke (ep20k600ebc652) board and i wanted to get familiar with the nios 1. so i create a nios processor and i added to it a rom for germs on chip mem and a ram on chip mem for the program. and i added two uarts rs232 uarts, a debug uart and one for the std.io. for this part i followed step by step the nios tutorial tt_nios_hw_apex_20k200e.pdf.

    so first question is : in my board i have just one rs232 dte how can use it for the both uarts ?

    my second consern is when i tried just to use the debug uart (nios tx to the pin af34 and nios rx to the pin ae34) and i typed the follwing:

    nb -b0x4000 hello_world.c

    and then

    nr -d hello_world.srec

    and after that i pressed the button mapped to the nios reset, i didnt get anything it seems that i couldnt upload the program to the board. it keeps displaying the dots.......

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=12684)

    --- quote end ---

    --- Quote End ---