DIGILENT PmodBT2 Powerful Peripheral Module User Manual

PmodBT2™ Reference Manual
Revised November 18, 2019
This manual applies to the PmodBT2 rev. A

Overview

The PmodBT2 is a powerful peripheral module employing the Roving Networks® RN-42 to create a fully integrated Bluetooth interface.

The PmodBT2.

Features include:

• Bluetooth 2.1/2.0/1.2/1.0 compatible
• Add wireless capability with this low power, Class 2 Bluetooth radio
• Supports HID profile for making accessories such as pointing devices, etc.
• Secure communications, 128-bit encryption
• Supports Bluetooth data link to iPhone/iPad/iPod Touch
• Six different modes
• Small PCB size for flexible designs 1.5“ × 0.8” (3.8 cm × 2.0 cm)
• 12-pin Pmod port with UART interface

Functional Description

The PmodBT2 uses a standard 12-pin port and communicates via UART. There is a secondary SPI header on the board for updating the RN-42 firmware if needed.
1.1 Jumper Settings
The PmodBT2 has several modes available to the user via jumper settings. JP1 through JP4 provide various modes of operation as indicated in Table 1 below. Each jumper is active when shorted. JP1 restores the device to factor default settings after three transitions of the jumper setting (short-to-open or open- to-short). After the third transition, the device returns to factor default except for the Bluetooth name. The other three jumpers, JP2-JP4, only sample in the first 500 ms of operation to allow the pins that they tie to on the RN-42 module to serve a separate purpose later in the modules operation. JP2 enables pairing with a special device class defined by the user in software. This may be used so that the PmodBT2 operates as a substitute for an RS232 cable. JP3 enables auto connect to a stored address defined by the user. Finally, JP4 chooses whether to operate at the stored baud rate (115.2kbps default) or a baud rate of 9600 regardless of the software selected rate when shorted. For more detailed information on jumper settings and functionality, refer to the RN-42 user manual.

Table 1. Set jumper description.

1.2 UART Interface
By default, the UART interface uses a baud rate of 115.2 kbps, 8 data bits, no parity, and a single stop bit. The startup baud rate may be customized to predefined rates or set to a specific user customized baud rate.
Predefined baud rates range from 1200 to 921k.
The reset pin (RST) on J1 is active low. If the RST pin is toggled, the device will undergo a hard reset. This hard reset performs similarly to a power cycling of the device. The second interface besides the standard UART signals is the STATUS pin also on J1The STATUS pin directly reflects the connection status of the device. STATUS is driven high by the device when connected and is driven low otherwise.
For more information on the devices UART interface and RST and STATUS pins refer to the RN-42 user manual on the Roving Networks website.
1.3 Command Mode
In order to enter the command mode, the PmodBT2 must receive “$$$” to which it will respond “CMD”. When in command mode, the module will respond to a large number of commands allowing the user to customizing the module for specific applications. In order to exit command mode, send “—” (three minus signs in a row and where stands for the carriage return character) to which the device will respond “END”. Remote configuration, or configuration over a Bluetooth connection, is possible through the command mode but has several restrictions. The configure time, which defaults to 60 sec, defines the time window in which the PmodBT2 may be configured remotely. Outside of this time, the PmodBT2 will not respond to any remote commands. It is important to note that any of the “set” commands available for the PmodBT2 must be followed by a power cycle to take effect in any design.

Connector J1 – UART Communications

Pin| Signal| Description
1| RTS| Ready to Send
2| RX| Receive
3| TX| Transmit
4| CTS| Clear to Send
5| GND| Power Supply Ground
6| VCC| Power Supply (3.3V)
7| STATUS| Connection Status
8| ~RST| Reset
9| NC| Not Connected
10| NC| Not Connected
11| GND| Power Supply Ground
12| VCC| Power Supply (3.3V)

Connector J2 – SPI Connector (Firmware Update Only)

Table 2. Connector descriptions.
The various modes of operation are accessed by using the “SM,<5,4,3,2,1,0>” command while in command mode. The PmodBT2 can be put into one of six available modes of operation. The modes in order, 0 to 5, are: slave, master, trigger master, auto-connect, auto-connect DTR, and auto-connect ANY. For more detailed information on the different modes of operation, refer to the RN-42 user manual. For the full list of device commands, how to user emote configuration, and more detailed information on the different modes of operation, see the RN-42 data.

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References

• Digilent – Start Smart, Build Brilliant.

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