Specifications

Bluegiga Technologies Oy
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7 GPIO and AIO Functions
7.1 iWRAP supported GPIO Functions
Various GPIO functions are supported by iWRAP. These include:
 Setting each GPIO state individually
 Binding certain iWRAP commands to GPIO to trigger the command at either the rising or falling edge
of the GPIO
 Carrier detect signal to indicate an active Bluetooth connection
 Implementing RS232 modem signals
 iWRAP ready indicator to signal to a host that iWRAP is ready to use
 UART bypass mode to route UART signals to GPIO pins instead of iWRAP
 Driving low frequency pulsed signal from a GPIO
Some of the functions are FW dependent. Refer to latest iWRAP user manual for the detailed information
about the GPIO functions.
7.2 Wi-Fi Co-existence Signals
Using few PS keys it is possible to implement HW coexistence between WiFi radio and WT32i. Figure 12
shows an example of Unity-3e coexistence between Bluegiga WF121 and WT32i.
WF121
WT32i
WLAN DENY
BT STATUS
BT ACTIVE
Figure 12: Example 4-wire coexistence scheme
Coex Signal /
Configuration Setting
Description
PSKEY
BT_STATUS
Dual signal used by
WT32i to indicate
transaction priority, high
or low, in the time
preceding a transaction,
and transmission or
reception activity during
a transaction. Based on
this PTA (Packet Traffic
Arbitrator) determines if
This signal is not configurable. Default is PIO5