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Routines |
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Used by the routine at UpdateLightYears.
Reduces the animation steps of the digits of LightYearsRemaining that are rolling, starting with the last digit. It stops at the first digit which is not rolling.
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Roll from the last digit upwards.
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| RollCounterDigits | ADE5 | LD HL,$5B39 | Point HL at LightYearsRemaining_LastDigit. | |
| ADE8 | LD B,$04 | Set a counter of four digits. | ||
| RollCounterDigits_RollDigit | ADEA | LD A,(HL) | Fetch the digit and its animation step. | |
| ADEB | AND %00000111 | Keep bits 0 to 2. | ||
| ADED | RET Z | Return if the digit is not rolling. | ||
| ADEE | DEC (HL) | Reduce the animation step. | ||
| ADEF | DEC HL | Move on to the next digit up. | ||
| ADF0 | DJNZ RollCounterDigits_RollDigit | Jump to RollCounterDigits_RollDigit until all four digits have been done. | ||
| ADF2 | RET | Return. | ||
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