LP-EM-CC2340R5: How to modify the TX power setting to 0 dBm at the Host test sample code?

Hi, 

The TxPower can be changed at run time. The function to use depends on the way host_test is used. 

Please see the following documentation https://software-dl.ti.com/simplelink/esd/simplelink_lowpower_f3_sdk/8.40.00.61/exports/docs/ble5stack/ble_user_guide/html/cc23xx/txpower-cc23xx.html#changing-txpower-at-run-time and https://software-dl.ti.com/simplelink/esd/simplelink_lowpower_f3_sdk/8.40.00.61/exports/docs/ble5stack/ble_user_guide/html/cc23xx/txpower-cc23xx.html#changing-txpower-for-dtm 

I hope this will help,

Best regards, 

Due to my device is connected to BLE tester requipment, I can not real-time to change Tx power by HCI command. Beacuse the Host_test code dafault seeting is +8dBm, the all test process is based on this setting.

So I must to modify this setting to 0 dBm first and than program this Host_test code into my device. 

I would like to know where is the modification path or item? Because I have tried this way (refer to picture), it is failed and has a build error.

Hi, 

Thank you for telling me. I understand you want to run Bluetooth certification tests where only the device's maximum TxPower has to be used. For this purpose, you can consider modifying the power table used so it only contains the relevant entry. 
Please see the steps below:

1. Start from an unmodified project - the modifications mentioned at the beginning of the thread should not be kept. Build the unmodified project once. 
2. Exclude from build the file "ti_radio_config.c". See here - you'll have to copy the file from the Release > syscfg to the Application folder, and untick the "include in build" button for the same file.
3. Modify the LRF_txPowerTable variable in the file Application/ti_radio_config.c, keeping only the entries of ".powerTable" you need, and removing the ohters. Ensure you also update the value of ".numentries".
   In your case, assuming you only want to transmit at 0dBm, you can use the following code: 
   

   // LRF_TxPowerTable data structure
   const LRF_TxPowerTable LRF_txPowerTable = {
       .numEntries = 0x00000001,
       .powerTable = {
           { .power = { .fraction = 0, .dBm = 0 }, .tempCoeff = 40, .value = { .reserved = 0, .ib = 21, .gain = 6, .mode = 0, .noIfampRfLdoBypass = 0 } },
       }
   };

4. Rebuild the project.

Important: 

• TI provides validated entries for the power table. Altering the entries provided by TI may impact radio performances and break regulation. This means, developers should only consider removing entries, never adding some. 
• Bluetooth certification and Regulatory tests must be run using the highest TxPower used in the final product. Said differently, system-integrators are recommended to use the same power table in the final product as for certification.
• The steps mentioned here are applicable both to host_test and basic_ble.

For convenience, here is the image I have obtained with the changes suggested: https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/538/host_5F00_test_5F00_0dBm_5F00_only_5F00_LP_5F00_EM_5F00_CC2340R5_5F00_freertos_5F00_ticlang.hex

I hope this will help,

Best regards,