question about usb cdc on PIC18F4550

[neohimura]

Hi,

I'm using the usb cdc function on PIC18F4550. I'm trying to send a array of data to PC using this function. The data I'm trying to send is as follows:

[Ttelmah]

What is a 'string' in C?.
A string is a _null terminated_ array of characters. Keyword here is 'null terminated'. Obviously trying to send a zero (NULL), should terminate a 'string' operation. So 'puts' is never going to work for an integer array containing zeros.
It is also potentially 'dangerous'. Things meant to work with 'strings', _require_ the null terminator. If your array happens not to contain an '0', then you could end up sending much more data than you expect...
Then look st the source code. usb_cdc.h
Read what it says. The only 'advantage' of 'puts', versus using 'putc', is that the former will send the entire 'string' as one transaction.
So then ask yourself if this 'matters' in your case?.
If it doesn't, then the putc solution, is simple.
If it does, then simply copy the usb_cdc_puts code, and remove the test for the null character (if (!c)), and substitute the buffer size count as the limit.
You could make it into a generic function, say
'usb_cdc_putarray(int8 *ptr, int8nbytes)', and then just call this with an array and the number of bytes.

Best Wishes

[neohimura]

I created a new function on usb_cdc.h as you mentioned and it works perfectly.

Thank you very much Ttelmah.