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How to use bitmaps in embedded software for monochrome LCD?

Other Parts Discussed in Thread: CC2430

Hello embedded engineers

I'm developing an embedded app wich uses a 320x160 monochrome LCD. I usually draw the images in Excel and convert them to hex arrays like this:

const unsigned char bitmap_9x15_0[2+17]={
    9,15,
    0x7C,0xDC,0x1D,0x1F,0x3C,0x78,0xF0,0xE0,0xC1,0x83,0x07,0x0F,0x1E,0x7C,0xDC,0x1D,0x1F
};

Now I have to print to the screen more complex images (company logo, icons...).

What's the best way to do it?, is there a freeware PC app which converts images to C source code?

I use a CC2430.

Thanks in advance