UG-012
Evaluation Board User Guide
Rev. 0 | Page 8 of 12
INTERRUPT CONFIGURATION TAB
The
Interrupt Configuration
tab is used to demonstrate the
built-in functions of the ADXL346. By selecting which functions to
enable and configuring the appropriate parameters, the benefits
and uses of the interrupts can be examined. This tab is updated
whenever an interrupt occurs. This means that some interrupts,
such as inactivity, if enabled alone, will not appear to be
updated.
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ADXL346 Evaluation GUI
Figure 13. Interrupt Configuration Tab
The
Current Status
indicators are updated when the panel is
first activated and when the
Configure Interrupts
button is
clicked. They show the register values at the time of the read.
The
Interrupt System Parameters
box is used to set the built-in
interrupt parameters. Here, the thresholds for tap and activity
events can be set, as well as the many timer values for the
interrupt parameters. The units of each are shown after the
parameter register name, and entered values are automatically
rounded to the nearest valid value.
The indicators for
ACT_INACT_CTL
and
TAP_AXIS
are used
to select the axes to include in activity, inactivity, and tap events.
For more details, refer to the ADXL346 data sheet. Clicking an
indicator causes it to toggle values. A lit indicator causes a value
of 1 to be written to that bit, and an unlit indicator causes a value
of 0 to be written to that bit.
In the
Interrupt Configuration
box, you can select the
interrupts to enable. For purposes of the GUI, all enabled
interrupts are mapped to the INT2 pin. Selecting the checkbox
next to the appropriate interrupt enables it.
Note that no registers or parameters are updated after setting
any individual box or indicator. To configure the interrupts
based on new values entered in this box, you must click the
Configure Interrupts
button in the bottom right corner.
Clicking this button updates the
Current Status
indicators and
configures the interrupts as set.
The
INT_SOURCE
,
ACT_TAP_STATUS
, and
TAP_SIGN
indicators are updated when an interrupt occurs. The data
ready (
DR
), watermark (
WM
), and overrun (
OR
) bits are
always set because this tab does not service data-related interrupts.
In the configuration shown in Figure 13, the accelerometer has
detected inactivity. If the accelerometer were moved with
enough force to exceed the 504 m
g
activity threshold, the
INACT
indicator would dim and the
ACT
indicator would light
up. If the accelerometer were put down and undisturbed for the
1 sec inactivity time, the
ACT
indicator would dim and the
INACT
indicator would again light up.
