Type casting custom structs to BaseSequentialStream

[kopanz]

Hi,

I have seen an example on Github that are printing characters to a GLCD by chprintf(),

Code: Select all

chprintf((BaseSequentialStream *)&GLCDD1, "chTimeNow: %d", chTimeNow());

Like this.

I have read the source of GLCD driver and couldn't find any relation between BaseSequentialStream and GLCD driver.
Can you please explain this kind of type casting by your similar experiences.
https://github.com/miguelmoreto/ChibiOS-LCD-Driver/blob/master/glcd.c
https://github.com/miguelmoreto/ChibiOS-LCD-Driver/blob/master/demos/drawing/main.c
GLCD driver and main.c can be found here. You can have a look if you have some time

Thank you

[Giovanni]

Hi,

You should look into the header file where the GLCD structure is defined, there it is where the stream behavior is inherited.

Giovanni

[kopanz]

Hi,

You should look into the header file where the GLCD structure is defined, there it is where the stream behavior is inherited.

Giovanni

It's not defined in the header file, but maybe it's not working.
Never mind Giovanni, Thanks