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Laird BL654 Series Application Note

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Application Note
The BL654 firmware natively supports Direct Test Mode (DTM) commands as specified in the Bluetooth SIG's Bluetooth Core
Specifications v 5.0 vol. 6 part F - Direct Test Mode, accessible from the following link:
www.bluetooth.com/specifications/bluetooth-core-specification
The purpose of DTM is to test the operation of radio at the physical layers such as for transmit power and receiver
sensitivity. This is useful for regulatory EMC testing or for co-located radio testing with another radio system.
This radio test can be carried out by dedicated test equipment (such as Anritsu MT8852 or similar) with the BL654 in DTM
mode as the device under test. Alternatively, you can send DTM commands from a PC using a terminal program such as
UwTerminalX. In both cases, the DTM commands remain the same.
This document describes BL654 radio testing using the in-built Direct Test Mode (DTM) firmware and Nordic's nRFgo Studio
or Laird Connectivity BleDtmRfTool.
▪
Entering DTM mode for the BL654
▪
Using Nordic nRFgoStudio DTM panel (or Laird BleDtmRfTool) to BLE radio test BL654 in either Transmit or Receive
mode.
▪
Exiting DTM mode for the BL654
To use DTM, you need the following:
▪
DVK-BL654-1.0 development board
▪
Windows PC
▪
UwTerminalX by Laird Connectivity (available at https://github.com/LairdCP/UwTerminalX/releases)
▪
Laird Connectivity BleDtmRfTool – This is available from the Documentation section of the
Note: You must be logged into your Laird Connectivity account for the BleDtmRfTool to work.
▪
Nordic nRFgoStudio application software (the complete install found on the Downloads panel at the following link:
http://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF52832
Note: Please install the correct version (32- or 64-bit) for your operating system.
Code
Name
Software tool for nRFgo Starter Kit and Development Kits for 32-bit (x86) Windows
nRFgo Studio-Win32
XP, Windows Vista, Windows 7, and Windows 8
Software tool for nRFgo Starter Kit and Development Kits for 64-bit (x64) Windows
nRFgo Studio-Win64
Vista, Windows 7, and Windows 8
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
1
© Copyright 2021 Laird Connectivty. All Rights Reserved
v1.2
BL654 product
page.
Version
1.21.2
1.21.2
Americas: +1-800-492-2320
Europe: +44-1628-858-940
Hong Kong: +852 2923 0610

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Summary of Contents for Laird BL654 Series

  • Page 1 Laird Connectivity BleDtmRfTool. ▪ Entering DTM mode for the BL654 ▪ Using Nordic nRFgoStudio DTM panel (or Laird BleDtmRfTool) to BLE radio test BL654 in either Transmit or Receive mode. ▪ Exiting DTM mode for the BL654 To use DTM, you need the following: ▪...
  • Page 2 Figure 1: J12 fitted over pins 1 and 2, and SW3 (reset button) Americas: +1-800-492-2320 https://www.lairdconnect.com/wireless- © Copyright 2021 Laird Connectivity, Inc. Europe: +44-1628-858-940 modules/bluetooth-modules All Rights Reserved Hong Kong: +852 2923 0610...
  • Page 3 Port corresponding to your development kit Baud Rate 115200 Parity None Stop Bits Data Bits Handshaking CTS/RTS Figure 2: UwTerminalX Settings Click OK to connect. Americas: +1-800-492-2320 https://www.lairdconnect.com/wireless- © Copyright 2021 Laird Connectivity, Inc. Europe: +44-1628-858-940 modules/bluetooth-modules All Rights Reserved Hong Kong: +852 2923 0610...
  • Page 4 AT+DTM 0xCB717B03 The module is now in Direct Test mode. Click Close Port to disconnect the development board from UwTerminalX. Americas: +1-800-492-2320 https://www.lairdconnect.com/wireless- © Copyright 2021 Laird Connectivity, Inc. Europe: +44-1628-858-940 modules/bluetooth-modules All Rights Reserved Hong Kong: +852 2923 0610...
  • Page 5 9600, 14400, 19200, 38400, 57600, 115200 Default 19200 Command AT+DTMCFG 3 n Values for n 0 (Disabled), 1 (enabled) Default Americas: +1-800-492-2320 https://www.lairdconnect.com/wireless- © Copyright 2021 Laird Connectivity, Inc. Europe: +44-1628-858-940 modules/bluetooth-modules All Rights Reserved Hong Kong: +852 2923 0610...
  • Page 6 GPIO number will have the output set to this value if DTMCFG 7 was used to set the direction as output. Command AT+DTMCFG 8 bitmask Values for n 0x00000000 to 0xFFFFFFFF (bit 0 is the lowest significant bit) Default 0xFFFFFFFF Americas: +1-800-492-2320 https://www.lairdconnect.com/wireless- © Copyright 2021 Laird Connectivity, Inc. Europe: +44-1628-858-940 modules/bluetooth-modules All Rights Reserved Hong Kong: +852 2923 0610...
  • Page 7 GPIO number will have the output set to this value if DTMCFG 7 was used to set the direction as output. Command AT+DTMCFG 18 bitmask Values for n 0x0000 to 0xFFFF (bit 0 is the lowest significant bit) Default 0xFFFFFFFF Americas: +1-800-492-2320 https://www.lairdconnect.com/wireless- © Copyright 2021 Laird Connectivity, Inc. Europe: +44-1628-858-940 modules/bluetooth-modules All Rights Reserved Hong Kong: +852 2923 0610...
  • Page 8 Constant Carrier – If a continuous [CW] TX signal is required Payload Length 37 bytes Once configured, click Start Test. If successful, no errors should show, as illustrated in Figure Americas: +1-800-492-2320 https://www.lairdconnect.com/wireless- © Copyright 2021 Laird Connectivity, Inc. Europe: +44-1628-858-940 modules/bluetooth-modules All Rights Reserved Hong Kong: +852 2923 0610...
  • Page 9 Once configured, click Start Test. If successful, no errors should show. Note: Rx Mode produces an RX LO leakage at the following frequency: 2*fRx-1MHz. Americas: +1-800-492-2320 https://www.lairdconnect.com/wireless- © Copyright 2021 Laird Connectivity, Inc. Europe: +44-1628-858-940 modules/bluetooth-modules All Rights Reserved Hong Kong: +852 2923 0610...
  • Page 10 Laird Connectivity’s BleDtmRfTool allows all BT PHY data rates to be tested, 1 Mbps, 2 Mbps and coded PHY 500 kbps (s=2) and 125 kbps (s=8). To begin using Direct Test Mode, follow these steps: Open Laird Connectivity BleDtmRfTool (Figure...
  • Page 11 In BleDtmRfTool DTM panel, there are two ways to use BleDtmRfTool, either manual entry or pressing buttons (Figure Manual entry Pressing buttons Figure 8: Opening the Direct Test Mode panel in BleDtmRfTool Americas: +1-800-492-2320 https://www.lairdconnect.com/wireless- © Copyright 2021 Laird Connectivity, Inc. Europe: +44-1628-858-940 modules/bluetooth-modules All Rights Reserved Hong Kong: +852 2923 0610...
  • Page 12 Select data rate from 1 MPHY or 2 MPHY or LE CODED (S=8) or LE CODED (S=2) or selecting Data rate continuous CW select 1 MPHY Standard or BL654 series BLE module currently does support standard modulation index, so press MOD’N Stable Modulation INDEX (STD)
  • Page 13 First start by pressing “LE RESET”. Data rate 1MPHY or 2MPHY or LE CODED (S=8) or LE CODED (S=2) Standard or Stable BL654 series BLE module currently does support standard modulation index, so Modulation Index press MOD’N INDEX (STD) Channel (fRx)
  • Page 14 After this command is complete, close UwTerminalX. Then re-open it and connect to the BL654 with the following default parameters: Americas: +1-800-492-2320 https://www.lairdconnect.com/wireless- © Copyright 2021 Laird Connectivity, Inc. Europe: +44-1628-858-940 modules/bluetooth-modules All Rights Reserved Hong Kong: +852 2923 0610...
  • Page 15 Updated with DCDC REG0, clear DTM Jamie M cc r a e 18 Jan 2021 Jonathan Kaye config and firmware 29.5.7.2 workaround Americas: +1-800-492-2320 https://www.lairdconnect.com/wireless- © Copyright 2021 Laird Connectivity, Inc. Europe: +44-1628-858-940 modules/bluetooth-modules All Rights Reserved Hong Kong: +852 2923 0610...