Hello! I wanted to use printf() function for debugging my project. I read the description about it but couldn't understand it, can u guys help me use it? i know that it prints the data in the "printf() viewer" btw i am using keil c uvison 4 and 89252.
p.s - please reply soon, it is for my competition and i am stuck with the coding.
It is often better to use a couple of I/O pins to drive LEDs.
The advantage with that is that you can toggle a LED while running your program in real-time speed. Serial data means the processor have to do lots of extra work to handle your printf().
In this case, you have problems with keyboard scanning - but keyboard scanning requires debounce handling, something that is very much affected by the execution speed.
Much problems can be handled with just 2-4 LED and a digital oscilloscope.
Indeed.
Although still intrusive, it is far less intrusive.
Other possibilities include:
1. Use a device with on-chip debug. (presumably, not an option here?)
2. Use the Simulator to investigate.
Thank you for your replies, i will try to use LED :)
Good idea.
However, when/if you do come to need printf (whether for debugging or other purposes), you now know where to look - don't you?
I think i will study harder to get to know more about my friend "printf()" , by the way can u still give me some links where i can understand more about our friend? Cause call the links above.. I am still in confusion
Thanks! :)
The standard usage of printf() is described in any and every 'C' textbook.
The specific details of Keil's C51 implementation are, as previously mentioned, here:
http://www.keil.com/support/man/docs/c51/c51_printf.htm (and linked pages)
All of Keil's documentation, examples, application notes, etc, are here: http://www.keil.com/support/
What information do you require beyond that?
The C51 documentation & example projects will also be on your PC as part of the Keil installation.