Bitfield for Kinetis

MAPC — Mon, 21 Mar 2016 20:45:43 GMT

Is there a way to make a bitfield structure for K22 in KDS?

Re: Bitfield for Kinetis

TICS_Fiona — Tue, 22 Mar 2016 09:15:27 GMT

Hello Macro

I tested in KDS 3.0 and defined the bitfield structure as below:

union {

unsigned char bits;

struct {

unsigned char bit0 : 1;

unsigned char bit1 : 1;

unsigned char bit2 : 1;

unsigned char bit3 : 1;

unsigned char bit4 : 1;

unsigned char bit5 : 1;

unsigned char bit6 : 1;

unsigned char bit7 : 1;

}R;

} Test_bit;

And access it in code as:

Test_bit.R.bit7=1;

This works as on other C compiler.

Best Regards

Fiona Kuang

Technical Information & Commercial Support

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egoodii — Tue, 22 Mar 2016 13:58:06 GMT

What are the resulting assembly-level instructions for the C-source 'Test_bit.R.bit7=1;'? I.e., what is the code-cost for packing density?