CC2431 Texas Advanced Optoelectronic Solutions, CC2431 Datasheet - Page 10

• Manufacturer Part Number: CC2431
• Description: System-on-Chip for 2.4 GHz ZigBee/ IEEE 802.15.4 with Location Engine
• Manufacturer: Texas Advanced Optoelectronic Solutions

(
be written.
The measured parameters must be written in
the order [A, n, x
…, rssi
the parameter load process commences
2.1.3
The estimated location coordinates are given
in meters in the interval [0.0, 63.75] with
resolution 0.25 m. The data format uses the
LSB bit as the fractional part.
When reference coordinates and measured
parameters have been loaded, the location
estimate is calculated by writing 1 to the
LOCENG.RUN
coordinates can be read from the
LOCY
1. The time until estimated coordinates can be
read
parameters, from 50 µs to 13 ms
MHz system clock) after
set to 1. The Location Engine does not
produce any interrupt requests.
The value of the X coordinate estimate given
by
be removed to obtain the actual X coordinate.
The offset removal must be performed after
2.2 Location Engine Register
This section describes the RF registers
associated with the Location Engine. These
registers are:
LOCENG.PARLD
•
•
•
•
•
LOCX
LOCENG
and status
REFCOORD
input
MEASPARM
input
LOCX
coordinate
LOCY
coordinate
registers when
varies
15
Location Estimation
] to the
includes an offset value which must
with
min
register bit. The estimated
MEASPARM
, x
-
-
-
-
-
=1), all 22 parameters must
delta
LOCENG.DONE
the
Location Engine control
Reference coordinates
Measured parameters
Location estimate X
Location estimate Y
, y
LOCENG.RUN
min
search
, y
register. Once
delta
CC2431 Data Sheet (Rev. 2.01) SWRS034B
, rssi
LOCX
boundary
(with 32
is set to
0
, rssi
was
and
1
,
(
with all 22 parameters. Included in these are
the 16 RSSI values which must be all written,
so any unused slots must be written as zeros.
After all 22 parameters have been written, a 0
must
LOCENG.PARLD
reading the
X value as follows:
X = (X
Where X
LOCX
parameters used as inputs to limit the search
as described in section 2.1.2.1.4. Notice that
the Y coordinate read
directly.
The estimated coordinates remain valid in the
LOCX
have been calculated or until a reset.
Note that
operation of the Location Engine.
The RF registers reside in XDATA memory
space. Table 3 gives an overview of register
addresses while the remaining tables in this
section describe each register in detail. Refer
also to section 1 for Register conventions.
For the remaining RF registers refer to the
CC2430 Data Sheet.
LOCENG.PARLD
, and x
LOCX
be
and
LOCX
- x
LOCENG.EN
LOCX
LOCY
written
min
min
is the value read from register
+1) % ( x
and x
.
register, to obtain the actual
=1) it must be completed
registers until new results
LOCY
to
delta
delta
must be 1 during
the
are the boundary
+ 1) + x
from can be used
CC2431
Page 10 of 15
register
min
bit