printf: possible bug!?

[PICoHolic]

Hi,

I've been using USB-CDC. My current compiler version is 4.078 & 4.079
When running the code, the hyper terminal stalls on the following code section:

[_Gerhard]

I'm not a hot shot pic programmer but as far as i can see your problem lies in the %bla part. This is not a valid format in ccs. %u or %f is valid but the character folowing % needs to be a valid one that ccs recognise.

[Wayne_]

% symbol when used in the C printf function is a special character. It denotes the type/format of the parameter it is displaying, e.g.

int a = 10;
printf("The value a = %u", a);

%u in this case tells the printf function that it is to display an unsigned int which is the first parameter passed, as it is the firs occurance of the % symbol.

To display an actual % symbol use %%.

So

int a = 1;
float b = 2.5;
char c = 'D';

printf("a = %u, b = %2f, c = %c, %%100 correct", a, b, c);

will show
a = 1, b = 2.5, c = D, %100 correct

See printf in the CCS help for more info.

[PICoHolic]

Sorry, my mistake.
There's no % in the actual statement, just:

[asmboy]

try this:

reverse the \n\r to be \r\n
in your code, you are sending LF,CR , while standard usage is CR,LF and some versions of hyperterm are quite fussy about that order.

[PICoHolic]

asmboy,

I dont think so. When compiled under previous version (4.057), everything works perfect!

Thanks

[FvM]

Hello,

did you check, if it's a particular problem with printf() or just when sending several characters through USB without a delay? I guess, it's the latter.

I had a problem with V4.079 and CDC driver, where I got global interrupts disabled inadvertently after calls to usb_cdc_putc(). See
http://www.ccsinfo.com/forum/viewtopic.php?t=36100&highlight=cdc

To check, if it's possibly the same issue, just place an enable_interrupts(GLOBAL) after the printf statement.

Regards,
Frank

[PICoHolic]

Hi FvM

It might be the case.
As I already mentioned, when compiled under previous version (4.057), everything works perfect.

Playing with workarounds is not a solution!

Thanks

[FvM]

Hello,

[PICoHolic]

I have already sent an email to support@ccsinfo.com

I can wait, no problem!

Thanks anyway