Importantly, this function sets the bits in the integer pointed to by display which may or MAY NOT BE the global display variable.
To properly set the display bits, set_display_from_batt() will need to do bit shifting along with bitwise operations to construct the correct bit pattern for the display.
A good trick to use is to create a series of bit patterns that correspond to the various digits. For example, according to the diagrams above, the bit pattern for 9 is 0b1101111. If a 9 should appear on the display somewhere, this bit pattern should be shifted and combined with the existing bits in display so that a 9 will show. Creating similar constant mask patterns for each digit, the decimal place, the positions of the Voltage/Percent indicator, and the bars for the visual level indicator is a good way to make this problem manageable.
A detailed explanation of one approach to the problem follows.
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