Semtech LR1110 - Gnssautonomous; Gnssassisted; Table 11-3: Gnssautonomous Command; Table 11-4: Gnssassisted Command

LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
97 of 130
Semtech
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11.3.3 GnssAutonomous
The command GnssAutonomous( ) allows capturing the GNSS signals in autonomous mode, for example in case no
assistance information is available, or for fast indoor/outdoor detection.
• Time: GPS time (GPST), in number of seconds elapsed since 6 January 1980. Hint: When converting from UTC to GPST,
the UTC-GPST corresponding leap second offset must be taken into account.
• EffortMode =0x00. Other values are RFU
• ResultMask: bit mask indicating which information is added in the output payload.
 bit 0: timestamp presence in output
 bit 1: doppler presence in output
 bit 2: bit change presence in output
• NbSvMax defines the maximum number of satellites wanted as a result of the GnssAutonomous( ). If more satellites are
detected during the scanning than NbSvMax,, then the satellites with the highest C/N0 are returned. If NbSvMax=0,
then all the detected satellites are returned.
Please note that calling this command resets the previous GNSS results, if any.
11.3.4 GnssAssisted
The command GnssAssisted( ) allows capturing the GNSS signals using assistance data (current time, approximate position,
and Almanac information)..
• Time: GPS time (GPST), in number of seconds elapsed since 6 January 1980. Hint: When converting from UTC to GPST,
the UTC-GPST corresponding leap second offset must be taken into account.
• EffortMode
 0x00: Low Power mod. The GNSS scanning stops the detection if no strong satellite is detected.
 0x01: Best Effort mode. The GNSS scanning continues the detection even if no strong satellite is detected.
Table 11-3: GnssAutonomous Command
Byte 0 1 2 3 4 5 6 7 8
Data from
Host
0x04 0x09
Time
(31:24)
Time
(23:16)
Time
(15:8)
Time
(7:0)
Effort
Mode
Result
Mask
NbSvMax
Data to
Host
Stat1 Stat2
IrqStatus
(31:24)
IrqStatus
(23:16)
IrqStatus
(15:8)
IrqStatus
(7:0)
0x00 0x00 0x00
Table 11-4: GnssAssisted Command
Byte 0 1 2 3 4 5 6 7 8
Data
from
Host
0x04 0x0A
Time
(31:24)
Time
(23:16)
Time
(15:8)
Time
(7:0)
Effort
Mode
ResultMask NbSvMax
Data to
Host
Stat1 Stat2
IrqStatus
(31:24)
IrqStatus
(23:16)
IrqStatus
(15:8)
IrqStatus
(7:0)
0x00 0x00 0x00