TMG49037 datasheet(64/79 Pages) OSRAM

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ams Datasheet

Page 63

[v1-01] 2019-Aug-20

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TMG49037 − Register Description

Gesture FIFO Access Registers (0xF8 − 0xFF)

Gesture data is stored in a 256 byte FIFO buffer containing 32

eight byte datasets. Each dataset contains one sample each of

North, South, West, & East gesture data. If the FIFO overflows

(i.e. 33 datasets before host/system reads data from the FIFO

buffer), an overflow flag will be set and new data will be lost.

Host/Systems acquire gesture data by reading addresses:

0xF8 – 0xFF, which directly correspond to North, South, West,

and East data points. The register address pointer automatically

wraps from 0xFF to 0xF8. Data can be read one byte at a time

(eight consecutive I²C transactions) or in blocks (there is no

block-read length limit). When reading single bytes, the internal

FIFO read pointer and the Gesture FIFO Buffer Level,

GFIFO_LVL, are updated each time register 0xFF is read. For

block-reads, the internal FIFO read pointer and the Gesture FIFO

Buffer Level, GFIFO_LVL update for each eight byte dataset. If

the FIFO continues to be accessed after GFIFO_LVL = 0, the

device will return 0 for all data.

Gesture interrupts and the gesture valid (GVALID) flag indicate

when there is valid data in the FIFO buffer. When the Gesture

FIFO Buffer Level exceeds the Gesture Entry Threshold

(GFIFO_LVL > GTHR_IN), a gesture interrupt is generated, and

the GVALID flag is raised. Reading any data will clear the gesture

interrupt, but GVALID will remain raised. A second interrupt is

generated when the gesture is complete (GTHR_OUT

conditions are met). The GVALID flag will remain raised until all

data has been read, clearing the FIFO buffer. Once the FIFO

buffer is empty, GVALID will be cleared to indicate that the

gesture is complete and all data is read. The amount of unread

data is indicated by the GFIFO_LVL.

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