User's Manual

80
www.lairdtech.com
Laird Technologies
BTM510/511
Bluetooth
®
Multimedia Module
Register GPIO Default Range Comment
S650 0 0..1 Mode for GPIO Cong Registers:
0 = no mask;
1 = enable i/o pin state mask
S651 GPIO1 0x0000 0..0xFFFF GPIO Conguration Registers
S650 must be set to 0 to enable congu-
ration access
Controls Pin State, Pin Direction, Pin
Inversion, Function Mapping Enable,
Function Mapping Select and Function
Mapping Code / av_operation_id.
See Table 3.37: GPIO Conguration
Register Field Descriptions
S652 GPIO2
S653 GPIO3
S654 GPIO4
S655 GPIO5
S656 GPIO6
S657 GPIO7
S658 GPIO8
S670 GPIO1..8 0x0000 0..0xFF Read/Write all GPIOs in one atomic step
(Write operation only affects GPIOs con-
gured as outputs)
0x0001: GPIO1
0x0002: GPIO2
0x0004: GPIO3
0x0008: GPIO4
0x0010: GPIO5
0x0020: GPIO6
0x0040: GPIO7
0x0080: GPIO8
Table 3.45: GPIO S Registers
  6.1 ProleSpecicGPIOFunctionMapping
In some Bluetooth proles it makes sense to map GPIOs to certain functions, e.g., Volume Up/Down
(HFP/A2DP), answer call (HFP), reject call (HFP) etc. Therefore, new S registers 651 to 663 will be
introduced, corresponding to GPIO1 to GPIO13. If a function mapping code is set to one of those
registers and function mapping enabled (FME=1), the appropriate Pin will carry out the assigned
function and will not be available anymore as GPIO.
The logical level of a GPIO can be inverted by setting the appropriate INV-ag of the appropriate
GPIO Conguration Register.
Restrictions can apply if certain GPIOS will be reserved for other functions in future, e.g., Wi-Fi
coexistence signalling.
Function Mapping Code Value Comment
Volume Up 0x01 A2DP,HFP: adjust volume locally
Volume Down 0x02 A2DP,HFP: adjust volume locally
Mute 0x03 A2DP,HFP
Answer Incoming Call 0x04 HFP
Reject Call or Hang Up 0x05 HFP
Reject Call 0x06 HFP
Hang Up 0x07 HFP
Table 3.46: GPIO Function Mapping Codes
AT COMMAND SET
REFERENCE