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| 1 | PPR = 1440 * 4 # decoder position steps per revolution | |
| 2 | ||
| 3 | # reduce x modulo n, but giving result in range(base,base+n) rather than range(0,n). | |
| 4 | - | def mod( x, n, base ): |
| 4 | + | # default output range is -n/2..n/2-1 (if n even) or -(n-1)/2..(n-1)/2 (if n odd). |
| 5 | def mod( x, n, base=-(n//2) ): | |
| 6 | return ( x - base ) % n + base | |
| 7 | ||
| 8 | - | position += mod( shmem.position - position, 2**32, -2**31 ) |
| 8 | + | |
| 9 | position += mod( shmem.position - position, 2**32 ) | |
| 10 | ||
| 11 | angle = position * 360 / PPR |
