DIGILENT PmodBT2 Powerful Peripheral Module User Manual
- June 12, 2024
- DIGILENT
Table of Contents
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.
Jumper | Description |
---|---|
JP1 (PIO4) | Factory Default |
JP2 (PIO3) | Auto Discovery/Pairing |
JP3 (PIO6) | Auto Connect |
JP4 (PIO7) | Baud Rate Setting (9600) |
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 “—
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)
1 | MISO | Master in/ Slave out |
---|---|---|
2 | MOSI | Master out/ Slave in |
3 | SCK | Serial Clock |
4 | ~CS | Chip Select |
5 | VCC | Power Supply (3.3V) |
6 | GND | Power Supply Ground |
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
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