perplex on a simple code

yu liu12655

I wrote a simple testing code in main fxn.(ccs3.3 DM648EVM)

int main()
{
int status;
static TSK_Handle LOCAL_hTskMain = NULL;
printf("111\n");
status |= APP_I2C_moduleCreate();
printf("222\n");
status |= APP_I2C_writeLeds(0x4,0x4);
printf("333\n");

}

but I got a loop of "111","222",there is no "333" to be printed. why did this happen?

I checked the writeLeds(), it only contains a GIO_write() may cause trouble.

please help a wandering sheep.

over 16 years ago

0 Mariana over 16 years ago

TI__Mastermind 24340 points

Hi yu,

Usually printfs problems can be solved according to this article:

http://tiexpressdsp.com/index.php/Tips_for_using_printf#Info_pertaining_to_embedded_processors

In your case, the problem could be the GIO_write. Please see pages 193/194 of the TMS320C6000 DSP/BIOS 5.32 Application Programming Interface (API) Ref Guide

1 - This function can be called within the program’s main() function only if the GIO channel is asynchronous (non-blocking). So you can have problems when calling it from main.

2 - Also you have to make sure that you are passing the correct parameters for GIO_write. You need to pass the gioChan - that is the one returned by GIO_create.

gioChan = GIO_create(name, mode, *status, chanParams, *attrs);

status = GIO_write(gioChan, bufp, *pSize);

You can create the GIO in main, but you can not try to read the driver before DSP/BIOS is running.

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perplex on a simple code