This does 3 things (with no additional initialization): Writing 0x04 to 0x(4)A600FE activates the MotionPlus as the "active" extension. crc32_msb,lsb is a crc32 of all calibration data except the checksum bytes. A value of 45 would mean the "scale" values represent the gyro at 270 deg/sec. Angular velocity of the above scale values in deg/sec divided by 6. Gyro values at 0 deg/sec to 16 bits of precision.
The 32 bytes from 0x(4)a60020 are, as usual, calibration information, described as follows:
More examples of this data block changing over time can be found here: Three Data Samples from Wii Motion Plus (Google Doc) (dead link). While initialising, the 128 bytes from 0x(4)a60050 - 0x(4)a600cf also change briefly, but randomly, after the extension is initialized. There is no need to read this byte, since games don't. While the Motion Plus is initialising, the value at 0x(4)a600f7 changes from 0x02 to 0x04 to 0x08 to 0x0C to 0x0E then stays at 0x0E. But there is no need to write 00 to 0x(4)a500fb, since Wii games don't do that. The extension is initialised by writing 0x55 to 0x(4)a600f0. If a Wii Motion Plus is not present, or it has already been activated, then the attempt to read those bytes will fail with error 7. Games attempt to detect the Wii Motion Plus by trying to read the two-byte expansion identifier at 0xA600FE (they try up to 3 times, then wait 8 seconds, then check again). The Wii Motion Plus is first identified by the 6 bytes: 00 00 A6 20 00 05 at register address 0x(4)a600fa (instead of 0x(4)a400fa like a regular extension). BUT it changes to 0xA40000 once it is activated by writing 04 to 0xa600fe. The Wii Motion Plus starts off at register 0xA60000 instead of register 0xA40000, because it has its own extension port on the back allowing a Nunchuk for example to be plugged in along with the Wii Motion Plus. 1.2 Classic Controller pass-through mode.In words - one third multiplied by minus twenty-three eighths = minus twenty-three twenty-fourths. In the next intermediate step the fraction result cannot be further simplified by cancelling. Result fraction keep to lowest possible denominator GCD(-23, 24) = 1. Multiply both numerators and denominators. Multiple: 1 / 3 * the result of step No.In words - one half minus twenty-seven eighths = minus twenty-three eighths.
In practice, it is enough to find the common denominator (not necessarily the lowest) by multiplying the denominators: 2 × 8 = 16. The common denominator you can calculate as the least common multiple of the both denominators - LCM(2, 8) = 8.
Whole number 3 equally 3 * 8 / 8 = 24 / 8ī) Add the answer from previous step 24 to the numerator 3. Conversion a mixed number 3 3 / 8 to a improper fraction: 3 3/8 = 3 3 / 8 = 3 Ī) Multiply the whole number 3 by the denominator 8.
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