LM3S3748 Hello World problem!

Imran Khan68504

Hi guys,

I am trying to run a simple HelloWorld program in CCSv4. I have done all the correct (or atleast i believe i have) settings and control features.

Everything builds normally and there are no errors. The problem is I don't get the output in the console. Can anyone tell me why?

#include <stdio.h>                        // standard I/O needed for printf

void main(void) {
    printf("hello world\n");

    return;
}

over 13 years ago

0 Imran Khan68504 over 13 years ago

Intellectual 550 points

I also tried this in CodeSourcery's GNU compiler for Cortex M3, which compiles normally, but gives me the following output:

sim: MULTIPLY64 - INVALID ARGUMENTS

0 Imran Khan68504 over 13 years ago in reply to Imran Khan68504

Intellectual 550 points

Okay, I found out why CodeSourcery's Simulator was giving me errors: the lite version doesn't support cortex processors :S.

Still waiting on an answer for CCS though...

I've checked the heap size and stack size, I've tried fflush(stdout) and I still can't get Hello World! to come out on the console... why is that??

Imran Khan said:

I also tried this in CodeSourcery's GNU compiler for Cortex M3, which compiles normally, but gives me the following output:

sim: MULTIPLY64 - INVALID ARGUMENTS

sim: MULTIPLY64 - INVALID ARGUMENTS

sim: MULTIPLY64 - INVALID ARGUMENTS

sim: MULTIPLY64 - INVALID ARGUMENTS

0 Ki over 13 years ago in reply to Imran Khan68504

TI__Guru**** 420760 points

Imran Khan said:

Still waiting on an answer for CCS though...

I've checked the heap size and stack size, I've tried fflush(stdout) and I still can't get Hello World! to come out on the console... why is that??

Have you seen this wiki article?

http://processors.wiki.ti.com/index.php/Tips_for_using_printf

The heap and stack size are common culprits but you mentioned you already checked those. What is the stack/help size that you see for your project?

0 Imran Khan68504 over 13 years ago in reply to Ki

Intellectual 550 points

The stack size was 256 and the heap size was 0, but I changed both to 0x800. I tried other larger values since you mentioned it but still nothing. I am beginning to wonder if Cortex-M3 supports printf or is that a stupid question ? I also tried other simulators but still get no output.

0 Ki over 13 years ago in reply to Imran Khan68504

TI__Guru**** 420760 points

Cortex M3 supports CIO. You just need to increase the default stack and heap size to values that will support it (which you did).

One thing to check is that you have the correct console context set. Check out the below FAQ. It shows how there are three consoles integrated into the view. While the graphic highlights the debugger console, make sure you set yours to the CIO console (3rd option):

http://processors.wiki.ti.com/index.php/FAQ_-_CCSv4#Q:_How_come_my_GEL_expressions_are_not_being_evaluated_when_I_enter_them_in_the_.27Console.27_view.3F

0 Imran Khan68504 over 13 years ago in reply to Ki

Intellectual 550 points

CIO console was the default option. Still nothing :(

I'm using the unlicensed version CCS4, if that makes a difference....

0 Imran Khan68504 over 13 years ago in reply to Ki

Intellectual 550 points

Hi Ki,

I think I found out why it wasn't working:

"What is not supported

Serial Wire Output for TPIU trace output

Standard Console I/O operations (fread, fwrite, fopen, etc.) are not yet supported on the current release of CCS when using the on-board emulator

XDS100"

http://processors.wiki.ti.com/index.php/Stellaris_support_in_CCS#What_is_not_supported

Please confirm if this is true....

0 Ki over 13 years ago in reply to Imran Khan68504

TI__Guru**** 420760 points

Imran,

I thought you also said you do not get any output on the Cortex M3 simulator. Is this true?

0 Imran Khan68504 over 13 years ago in reply to Ki

Intellectual 550 points

Hi Ki,

Good news! You were right, it is possible. I just uinstalled CCS and reinstalled it again, and everything works now. I think I must've messed up some settings when I first installed. Again, Thanks for your help!

Imran

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LM3S3748 Hello World problem!