DVK-BTM521 Laird Technologies, DVK-BTM521 Datasheet - Page 85

• Manufacturer Part Number: DVK-BTM521
• Description: BT MM DEV KIT
• Manufacturer: Laird Technologies
• Type: Transceiver, Bluetoothr

Specifications of DVK-BTM521

• Frequency: 2.4GHz
• Interface Type: RS-232
• Processor Series: BTM521
• Silicon Manufacturer: Laird Technologies
• Kit Application Type: Communication & Networking
• Application Sub Type: Bluetooth
• Kit Contents: Development Board & Software Tools
• Features: Supports CSR
• Rohs Compliant: Yes
• For Use With/related Products: BTM521
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: DVK-BTM521

BTM520/521
Bluetooth
AT COMMAND SET
REFERENCE
85 www.lairdtech.com
®
Multimedia Plus Module
Register
S336
S337
S338
S340
S341
S342
S343
S730
S731
8. GPIO
On a BTM520/521 device, a number of digital I/Os can be used for general purposes. Each GPIO
will be assigned to an S-Register (S651 to S663) which will be capable of both GPIO configuration
(config mode) as well as single pin read/write access (r/w mode). The bitmask of the I/O pin for direct
read/write access will be 0x01. All configuration flags are allocated to higher value bits. A bitmask for
the I/O pin will be applied to if new S-Register 650 is set to 1. This will enable the user to access a
GPIO-Pin directly by reading/writing 0 or 1. If the GPIO shall be configured, S650 must be set to 0
in order to obtain access to the GPIO configuration flags.
All logical GPIO lines can be read/written in one atomic step by new S-Register 670 at any time.
Some GPIOs can have an alternative function assigned. If the alternative function is enabled, the
appropriate I/O Pin is not available as GPIO any more. Handshaking functions are generally enabled
per default. Wi-Fi coexistence functions are currently not used. But if they should be used or required
in the future, the appropriate function cannot be moved to another I/O Pin. Hence, it should be
considered that no other user function is assigned to an I/O Pin if the coexistence functions are
required. The following table lists all GPIOs and their alternative functions.
Default
2048
0
5
0
2048
0
5
0
0
GPIO Pin
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
GPIO8
GPIO9
GPIO10
GPIO11
GPIO12
GPIO13
Range
0..4095
0..15
0..15
0..3
0..4095
0..15
0..15
0..1
0..255
Table 3.40: S Registers for Hardware Units
Table 3.41: GPIO - Alternative Functions
Handshaking
Description
Set LED 0 Duty Cycle,
referenced if LED mode = LED_PWM or LED_PULSE
Set LED 0 PWM Period, referenced if LED mode = LED_PWM
Set LED 0 Pulse Rate, referenced if LED mode = LED_PULSE
Set LED1 mode
0 = LED_OFF
1 = LED_ON
2 = LED_PWM
3 = LED_PULSE
Set LED 1 Duty Cycle,
referenced if LED mode = LED_PWM or LED_PULSE
Set LED 1 PWM Period, referenced if LED mode = LED_PWM
Set LED 1 Pulse Rate, referenced if LED mode = LED_PULSE
Enable Auxiliary DAC
Set Auxiliary DAC Level
DTR
-
-
-
-
-
-
-
-
-
-
-
-
Alternative Function
BT_State/BT_Priority
Wi-Fi Coexistence
Wlan_Active
RxEnable
TxEnable
-
-
-
-
-
-
-
-
-
Laird Technologies