Difference between revisions of "Firmware-72 Function-004"
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The absolute function provides a way to convert signals that vary around a center value (such as from accelerometers and physiological sensors) to a value from zero. The following methods can be selected using the FUNCTION command’s parameter values FP1 and FP2: | The absolute function provides a way to convert signals that vary around a center value (such as from accelerometers and physiological sensors) to a value from zero. The following methods can be selected using the FUNCTION command’s parameter values FP1 and FP2: | ||
| + | FP1 | ||
{| | {| | ||
| − | | | + | |0xxxxxxx: |
|xxxxxxx = [0..127]; Offset high bits | |xxxxxxx = [0..127]; Offset high bits | ||
| − | | | + | |} |
| − | | | + | |
| + | FP2 | ||
| + | {| | ||
| + | |00000yyy: | ||
|yyy = [0..7]; Offset low bits | |yyy = [0..7]; Offset low bits | ||
|} | |} | ||
Revision as of 16:03, 3 November 2015
ABSOLUTE (4, 04h)
The absolute function provides a way to convert signals that vary around a center value (such as from accelerometers and physiological sensors) to a value from zero. The following methods can be selected using the FUNCTION command’s parameter values FP1 and FP2:
FP1
| 0xxxxxxx: | xxxxxxx = [0..127]; Offset high bits |
FP2
| 00000yyy: | yyy = [0..7]; Offset low bits |
The offset is calculated as a 10-bit value represented by xxxxxxxyyy.
Example:
In order to output the value generated by a sudden motion of a GForce3D-6 sensor as a MIDI controller 64 message, the following messages are sent (see also the EDIT CONFIG command):
|240, 125, 0 {DEV}, 8 {FUNCTION}, 0 {input}, 0 {offset least significant bits}, 4 {absolute function}, 64 {offset MSB}, 247 (F0h, 7Dh, 00h, 08h, 00h, 00h, 04h, 40h, F7h)
|240, 125, 0 {DEV}, 106 {EDIT CONFIG}, 1 {configuration number}, 0 {input}, 48 {control-change message}, 64 {controller number}, 34 {peak detection with end notification}, 1 {threshold}, 64 {top}, 0 {noisegate}, 0 {time window}, 247 (F0h, 7Dh, 00h, 6Ah, 01h, 00h, 30h, 40h, 22h, 40h, 7Fh, 00h, 00h, F7h)
The threshold value may need adjustment to properly capture the signal peaks.
