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Printf and graphics lcd routines

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Dave_blade
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Printf and graphics lcd routines
Posted: Fri Feb 02, 2007 7:03 am

Can printf be used with CCS'S graphics driver file. Regards all Dave

VanHauser

Joined: 03 Oct 2005
Posts: 88
Location: Ploiesti, Romania

Posted: Fri Feb 02, 2007 9:47 am

Reply with quote

Of course it can be. You just need to give it a function that prints one character to the LCD. Assuming that you have a function like:

Code:

void glcd_putc(char c)
{
...
}

all you have to do is:

Code:

printf(glcd_putc, "some text %u %lu", n1, n2);

printf can be used like the usual way.

In the CCS graphics driver you must modify the function glcd_text57 that draws a string to draw only one character, like above. Before using printf with this, you must take care of positioning your cursor and automatically incremeting its position after every glcd_putc call.

Another way is to use sprintf to print text to a buffer array, and then use the graphics driver function glcd_text57 to output this buffer to the LCD. This would take care of the screen position incrementing.

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