DE2-70 RS232 and VGA Question

Hi

Any chance you could post up some sample code to read the Rx data from the RS232port on the DE boards please? I have a DE1 and am having trouble reading the data. I am effectively trying to eavesdrop on an rs232 line.

Cheers in advance,

hiru

Cheers for the promt response mate.

The SOPC component is fine, it is the actual software side in NIOS that I am having trouble writing.

At the moment I have the pin for Rx going into the RS232 Uart on my NIOS processor. I only need to be able to read what communication is happening.

If you could help me out with the code it would be extremely appreciated, I'm not all that great with programming.

Also I haven't been able to find very much information... I'm possibly looking in the wrong place? I couldnt find any ready made API's...

Thanks again!

Try this:

# include <stdio.h>

# include <string.h>

int main ()

{

FILE* fp;

char prompt = 0;

fp = fopen ("/dev/uart1", "r+"); //Open file for reading and writing

//replace 'uart1' with device name you have in sopc builder

if (fp) {

printf("UART Opened Successfully\n");

while (1) {

printf("%c", getc(fp));

}

}

else {

printf("Error: Could not open UART\n");

}

return 0;

}

I have made it in quick time, so not sure if this returns any error, but you can modify it as you like. I have not used but you may want to add fclose(fp) to close UART properly at later stage.

Cheers for the help! I tried it but i get the error below

--------------------------------------------------------------------------

**** Build of configuration Release for project hello_world_small_0 ****

make -s all includes

Linking hello_world_small_0.elf...

obj/hello_world_small.o(.text+0x1c): In function `main':

../hello_world_small.c:28: undefined reference to `fopen'

obj/hello_world_small.o(.text+0x38):../hello_world_small.c:33: undefined reference to `getc'

collect2: ld returned 1 exit status

make: *** [hello_world_small_0.elf] Error 1

Build completed in 30.842 seconds

--------------------------------------------------------------------------

I spent a bit of time trying to figure out why it doesnt recognist 'fopen' but couldnt get to the bottom of it?? I'm guessing I must have missed a# include but i couldnt remember which (if any) relates to it....

essentially there are six variables being broadcast from a device to a computer and I am trying to eaves drop on this line to get those six variables into quartus. Hope that makes sense!

So where should I go from here? Sorry for being such a noob..

Hi,

you can go to here http://www.alteraforum.com/forum/showthread.php?t=4903 where you find some Verilog HDL Code which allows you to use the RS232 interface.

Cheers mate! I came across that before but for some reason it wouldnt let me download the file. Got it this time tho!

I'll give that a go and let you know how it went.

Thanks again!

If there's any other tips/info please feel free to add it in the meantime!

Any advice as how to turn that VHDL file into a block so i can add it to my bdf with my existing nios? also i only have a de1 board not a de2 board so i guess that vhdl file doesnt really apply; i'm guessing i just need to change the pin assignments?

is there any chance of anyone having an example project (or a link to one) which uses the rs232 with a nios processor? I am struggling and feeling rather helpless at the moment. I really need to get over this hurdle soon!

I appreciate everyone's help!