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fprintf and usb_cdc_putc stream

 
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Jody



Joined: 08 Sep 2006
Posts: 182

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fprintf and usb_cdc_putc stream
PostPosted: Tue Aug 23, 2022 1:21 am     Reply with quote
Hello,
What I am trying to do:
Send a string and a variable to the usb.
PIC send and receive single strings.. when using the printf command i.e.:
Code:
printf(usb_cdc_putc,"Tel_Temp 1 number  :);

this working ..
but when i do this:

Code:
fprintf(usb_cdc_putc,"Tel_Temp 1 number  : %s", tel_temp1);


the compiler complains: Stream must be a constant in the valid range .
And I don't understand what the problem is..
When I use the same command to a different stream it is fine...
so this goes with no problem:
Code:
fprintf(RS232,"Tel_Temp 1 number  : %s\n", tel_temp1)


what am I doing wrong??

Best regards,
Jody
Ttelmah



Joined: 11 Mar 2010
Posts: 19537

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PostPosted: Tue Aug 23, 2022 10:32 am     Reply with quote
fprint, prints to streams.

usb_cdc_putc, is _not_ a stream. It is a output function for the usb.

You don't want to be using the stream function. Just:
Code:

printf(usb_cdc_putc,"Tel_Temp 1 number  : %s", tel_temp1);


printf, can write to any output function.
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