How to set different Channels/Frequencies for TX/RX (2402, 2440, 2480 MHz)

[ledi001]

Hello,

I am using the BLE_p2pServer_ota example from the STM32Cube_FW_WBA_V1.4.1 firmware package.

For testing purposes I would like to set different channels/frequencies for TX/RX (2402, 2440, 2480 ... MHz). Where can I find the corresponding functions for setting them?

[_Joe_ · Accepted solution]

Hi Ledi,
You can't choose your channels directly, but you can choose to exclude some of them.
This is mentioned in the errata sheet for the stm32wba (2.3.1 Bluetooth® Low Energy frequency deviation (DF1)).
This is done with the command: HCI_LE_SET_HOST_CHANNEL_CLASSIFICATION.

PS: Be careful, however, that if you exclude too many channels, the link may become unstable if the remaining channels are disturbed.

BR, Joé

[ledi001]

Hi @_Joe_ ,

Thank you for the answer. Where can I find the command HCI_LE_SET_HOST_CHANNEL_CLASSIFICATION? There are so many files in the BLE_p2pServer_ota project. Is there an easy way to find the command via a search window in the whole project (not only in the selected file)?

BR, Ledi

[RealEstateJot1]

To set different channels or frequencies for TX (transmit) and RX (receive) at 2402, 2440, or 2480 MHz, follow these steps:

1. Check Device Compatibility: Ensure your device supports custom frequency settings and operates in the 2.4 GHz band.
2. Access Configuration Software: Use your device's firmware or software interface to access radio settings. For most devices, this involves logging into the admin panel or using a specialized tool.
3. Set TX Frequency: Navigate to the transmission settings and input your desired frequency, such as 2402 MHz.
4. Set RX Frequency: Adjust the receiving frequency to 2440 MHz or 2480 MHz, depending on your requirements.
5. Verify Frequency Separation: Ensure the TX and RX frequencies are within the allowed band limits and comply with regulations in your region.
6. Test the Configuration: Perform a signal test to confirm that the transmission and reception work as expected without interference.

Properly setting frequencies can optimize your device's performance and reduce interference with nearby channels.