CC2564B FCC Testing - Baud Rate & Duty Cycle

Unni krishnan

Prodigy 105 points

I am trying to find out how to create a firmware that would satisfy the below FCC test condition:

Bluetooth should broadcasts at channels 2402/2441/2480 MHz with a duty cycle as close to 100% as possible.

I have gone through the below links so far.

TI FCC Certification Guide

CC256x FCC Testing Guide

CC256x FCC Testing Guide for MSP430

How to Certify your Bluetooth product

CC256x VS HCI Commands

Whitepaper

TI Forum Post

I am planning to call VS_Enable_FCC_Test_Mode() available in Bluetopia\btvs\BTVS.c with the below arguments:

Modulation_Type = mtContinuousWave
Test_Pattern = VS_TEST_PATTERN_PN9
Frequency_Channel = 0 for 2402 MHz, 39 for 2441 MHz, 78 for 2480 MHz
Power_Level = VS_MAXIMUM_POWER_LEVEL
Generator_Init_Value = 0
EDR_Generator_Mask = 0

I have the following questions.

1. CC256x FCC Testing Guide for MSP430 says that I need to load the service pack (SP). Is this required?

2. The current baud rate is 115200 bps. Do I have to change this? The application uses Serial Port Profile.

3. Will the above mentioned arguments to VS_Enable_FCC_Test_Mode() ensure a 98% and above duty cycle?

4. The result for HCI_VS_Get_System_Status (0xFE1F)says that deep-sleep mode is "HCILL deep sleep enabled". Do I have to change this to "Deep sleep disabled" for the FCC test?

Please let me know if I am on the right track and also if you have answers to any of these.

over 9 years ago

0 Vihang Parmar over 9 years ago

TI__Mastermind 29311 points

Hi,

1. The FW service pack (SP) is required at initialization for CC256x to operate correctly. If you are using a profile like SPP from the TI Bluetooth Stack sample applications, the FW patch is loaded automatically when the sample application initializes.

2. The FW patch initializes the baud rate for the device as well. No need to change it.

3. Yes. When you Enable FCC test mode using Modulation_Type = mtContinuousWave, the CW signal will be 100% duty cycle.

4. You can keep the HCILL settings to the default (HCILL deep sleep enabled)

Best regards,

Vihang

0 Unni krishnan over 9 years ago in reply to Vihang Parmar

Prodigy 105 points

Thank you very much for the really quick reply. I have one more question that I wasn't able to verify 100% by myself:

According to here, there are 3 HCI commands involved in setting the BT chip to FCC test mode:

The Bluetopia SDK function VS_Enable_FCC_Test_Mode() is sending these 3 commands.

Question: My understanding is that once I call this function, everything else is taken care off for putting the chip in FCC test mode. Is that correct or is anything else expected from my side?

I apologize if my questions looks like I am being too lazy. I don't have a BT tester or a spectrum analyzer to verify that my code is working as expected. I will be sending it to somebody else and I would like to make sure that everything is good from my side.

0 Vihang Parmar over 9 years ago in reply to Unni krishnan

TI__Mastermind 29311 points

Hi,

Yes, the VS_Enable_FCC_Test_Mode() is enough to set the chip in con. TX mode. Please note that the device will need to go through a power cycle to change the test modes after that.

Best regards,
Vihang

0 Unni krishnan over 9 years ago in reply to Vihang Parmar

Prodigy 105 points

Thank you very much.

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CC2564B FCC Testing - Baud Rate & Duty Cycle