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Microcontroller Programming » lcd streams - Can a 'stream be defined that has a scope across the entire program?
November 05, 2011 by JimFrederickson |
I am not really a "C" person, but I can do a few things. I can use a 'stream' to send data to the LCD. What I was wondering though... Can a 'stream be defined to have a global scope for the program'? The only way I have been able to get it to work is by 'defining a stream in each function that I use a stream to print in'... I was wondering if I could just define 'lcd_stream' one time and reuse that? Does it matter? Thanks... |
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November 06, 2011 by rob_k |
I am not a c expert, so take what I say with a grain of salt. You could define the stream in a header file, and include that wherever you wanted it. If you have the header guards (i.e., the #ifdef something #define something #endif business), you can be guaranteed it will only be defined once, and also would be global wherever you include the header file. Global streams are usually a bad idea, but I assume you are not doing any preemptive multitasking so it probably would be fine. |
November 09, 2011 by JimFrederickson |
I just gave up on using the LCD as a 'Stream'... I couldn't find a way that worked for me where a 'Stream' could be opened and used from within various functions as I needed. I just created my own routines that could be called from the necessary functions without having to open a 'New Stream' or 'Sharing a Stream'. It is, in the end, more efficient, as far as space usage goes, in any case. Thanks though. |
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