Bluetooth LE Adaptivity Test

[中文]

The Bluetooth LE Adaptivity Test ensures that the device operates using frequency hopping and the Power Spectral Density (PSD) of the Bluetooth LE signal exceeds 10 dBm/MHz, meeting specific parameter requirements to prevent interference with other wireless devices.

Note

  • If the PSD of the Bluetooth LE signal transmitted by the device is less than 10 dBm/MHz, the interference mitigation techniques with the equivalent occupancy rate of no more than 10% can be applied. In this case, the Bluetooth LE Adaptivity Test is not required.

  • If the PSD of the Bluetooth LE signal transmitted by the device exceeds 10 dBm/MHz, the Listen Before Talk (LBT) mechanism based on frequency hopping can be used to perform the Bluetooth LE Adaptivity Test.

Set Up Test Environment

../../_images/ble_adaptive_connection.png

Test Environment Setup

  • In the test, the ESP32-C3 module is used as the test device (Slave) to establish a connection with the device under test (Master). Both the Slave and Master are flashed with the same firmware, but they can be distinguished using the serial port commands.

  • The Test System refers to the system that performs adaptivity test. Once the Master and Slave are successfully connected via the serial port command, the test can begin.

Note

  • The CHIP_EN pin of the device under test is pulled up by default. If it is not pulled up in the product design, you need to manually connect the CHIP_EN to the 3V3 pin.

  • Some serial communication boards have already swapped RXD and TXD internally, so there is no need to reverse the connection. Adjust the wiring according to the actual situation.

  • ESP32-C3 has a power-on self-calibration function, so the RF connection cable must be connected to the tester before the device under test is powered on for testing.

Flash Firmware

  1. Open DownloadTool.

  2. Set ChipType, Com Port, Baud Rate, click Open, and select to download to Flash.

  3. Flash ESP32-C3 Bluetooth LE Adaptivity Test Firmware to 0x0 via UART.

../../_images/ble_adaptivity_firmware.png

Flash Firmware

After the flashing is completed, continue the following steps for testing.

Start Testing

Bluetooth LE Adaptivity Test requires inputting corresponding serial port commands in both Mater and Slave devices to establish a connection for testing.

Open the serial port assistant and enter the corresponding commands on the Slave and Master devices in turn:

  1. Slave Device

//Start advertising on the test device
bleadve -C -z start -t 19 -u 13

  1. Master Device

//Establish a connection with a data rate of 1 Mbps (to configure 2 Mbps, change parameters to "-x 2 -y 2"), set power level to 13
bleconn -T -z start -x 1 -y 1 -n 1 -i 0x6-0x6 -v 13

//Configure power, default is set to level 13 (the parameter after "-e" should be consistent with the one after "-v" in the previous command)
ble -S -z etxp -t 4 -h 1 -e 13

//Set MTU
gattc -C -m 512 -p 0x10 -r c0:11:11:11:11:11 -b 1

//Send data
gattc -W -z char -p 0x10 -s 0xA002 -c 0xC317 -l 490 -n 0xFFFFFFFF -w 1 -r c0:11:11:11:11:11 -g 1 -b 1

  1. Other Operation Commands

//Disconnect
bleconn -D -z all

//Reboot the module
reboot

After entering the above commands, you can continue with the Bluetooth LE Adaptivity Test.