Laird BTM510, User Manual

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www.lairdtech.com Laird Technologies
BTM510/511
Bluetooth
®
Multimedia Module
GPIO Pin
(BTM510/511)
Alternative Function
Handshaking Wi-Fi Coexistence
GPIO1 - BT_Active (1)
GPIO2 DCD -
GPIO3 DSR -
GPIO4 RI -
GPIO5 - BT_State/BT_Priority
GPIO6 - Wlan_Active
GPIO7 - Rf_Active
GPIO8 DTR -
(1) BT_Active = RxEnable OR TxEnable
GPIO - Alternative Functions
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
function mapping code / av_operation_id Reserved FMS FME INV DIR PS
Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 3.29: GPIO configuration register
Field Description
0 – PS I/O Pin State – returns the current state of the I/O pin (0/1) when read
A write affects the I/0 pin directly if DIR=1 and FME=0.
1 – DIR Direction – controls if the I/O pin is an input or an output.
0 input
1 output
2 – INV Inversion – controls if the I/O pin is inverted or not. Applies to both pin directions
(read and write).
0 not inverted
1 inverted
3 – FME Function Mapping Enable – Enables function mapping of the pin. A function
mapping code or an av_operation_id must be set in GPIO configuration register
[8:15]. The pin will carry out the assigned operation and is not accessible anymore
as GPIO.
0 disable function mapping
1 enable function mapping
4 – FMS Function Mapping Select – Selects if a Function Mapping Code (see Table 3.46)
or an av_operation_id (see Table 3.20) is set in GPIO configuration register [8:15].
Valid only if FME=1.
0 select Function Mapping Code (Table 3.46)
1 select av_operation_id (Table 3.20)
[5:7] Reserved
[8:15]
function mapping code /
av_operation_id
A Function Mapping Code (FMC, Table 3.46) or an av_operation_id (Table 3.20) is
set in this bit field. The pin is mapped to a profile specific function (A2DP,HFP) or
to an AVRCP remote control operation and will carry out the assigned operation.
A mapped function does not affect any other flag of the GPIO configuration reg -
ister. So, e.g. DIR and INV must be set manually according to the selected function
and hardware requirements.
Valid only if FME=1.
FMS selects function mapping code or av_operation_id.
See also section 6.1, on page 80 “Profile specific GPIO function mapping”
And section 5.5 on page 53 “AVRCP GPIO Mapping”
Table 3.44: GPIO Configuration Register Field Descriptions
AT COMMAND SET
REFERENCE