CC2564C: CC2564C plus Bluetopia: A3DP Stream Interruption

user4250105

Part Number: CC2564C

Hi,

I am working with the CC2564C Bluetooth module and a STM32F4 microcontroller.

My main goal is play music of the mobile phone and I am using the "A3DPDemo_SNK" example to this. Everything is working fine except for one point. The stream stops after a while. This time (from start until the interruption) is variable. Some times this occur after 30 minutes of stream and in other times this occur with 5 minutes. I tested with a Iphone and with an Android and the errors was the same.

In the description below are the main points that I noted:

1) After mobile phone connection and stream start, the CC2564C operates alone without HCI commands unless necessary. I think that this is the expected behavior, because I using the assisted A2DP.

2) When the music stop, I observed in a logic analizer that the CC2564C don't answer the command "VS_A3DP_Sink_Stop_Stream". In the normal situation the microcontroller send the command "0x01, 0x9E, 0xFD, 0x04, 0x00, 0x00, 0x00, 0x00" and the module answer with "0x04, 0x0E, 0x04, 0x01, 0x9E, 0xFD, 0x00" followed by others TX and RX commands. But, when this interruption occurs, just the first command is sent by microcontroller and without any answer a timeout occurs.

3) I thought that this problem could be related with the stack corruption described here (e2e.ti.com/.../805393, but after see that any HCI command are running when the interruption occur, I have sure that is not a stack corruption.

4) I have already updated the "CC256XC.h" file to the last version (V1.2) and the result was the same.

5) I used the Logger tool to catch the error and I am attaching the log. In the first log, I notted that when the error occured was at the same time that "AVPR DMA: ERROR!! Transaction didn't complete" message was logged (at 11:43:17). In the second log, the same error occurred at 13:35:56 and again was when the music stopped. In this second log the message "Cortex Hard Fault" was logged too.

I will apreciate some help here.

Best regards,

José Vinícius Melo.

1732.Logger.rar

over 5 years ago

0 user4250105 over 5 years ago

Prodigy 175 points

I am attaching other log. This time, the error occurred at 15:19:50. After the error "AVPR DMA: ERROR!! Transaction didn't complete" the behavior appear to be different in every log.
3.rar

0 Vincent Rodriguez over 5 years ago in reply to user4250105

TI__Mastermind 28285 points

Hi Jose,

Let me see if i can reproduce and get back to you. If you run A2DP, does the same issue occur?

Best Regards,
Vince

0 user4250105 over 5 years ago in reply to Vincent Rodriguez

Prodigy 175 points

Hi Vince,

I am using a microcontroller, so I need to use the assisted A2DP. In fact, even if the A2DP works, it is not a solution for me.

I noted that the error is preceded by "AVPR IS FULL - THROW AWAY THE PACKET" message. Why this message appear and how can be prevented?

Thanks.

0 user4250105 over 5 years ago in reply to user4250105

Prodigy 175 points

Hi Vince,

Do you have some update about this case?

Best regards,

Vinícius.

0 Vincent Rodriguez over 5 years ago in reply to user4250105

TI__Mastermind 28285 points

Vinícius,

I haven't been able to reproduce the issue. Let me keep debugging and let you know what i find.

Best Regards,

Vince

0 user4250105 over 5 years ago in reply to Vincent Rodriguez

Prodigy 175 points

Vince,

Like I said previously, I noted that the error is preceded by "AVPR IS FULL - THROW AWAY THE PACKET" message. What is the situation that this message appear and how can be prevented?

Best Regards,

Vinícius.

0 Vincent Rodriguez over 5 years ago in reply to user4250105

TI__Mastermind 28285 points

Apologies for the delay, i should have you an answer this week.

BR,

Vince

0 user4250105 over 5 years ago in reply to Vincent Rodriguez

Prodigy 175 points

Hi Vince,

I will wait for you reply.

Thanks.

0 Vincent Rodriguez over 5 years ago in reply to user4250105

TI__Mastermind 28285 points

Jose,

Apologies for the delay. I working on recreating this on my end. I assume you are using the default A3DP example with no modifications?

Looking at the logs, It does appear to be a firmware issue, but want to make sure no other changes were made that could impact it.

Best Regards,

Vince

0 user4250105 over 5 years ago in reply to Vincent Rodriguez

Prodigy 175 points

Hi Vincent,

The first time that I faced this error was in my own hardware and firmware. So, I executed a test with the following setup: STM3240G-EVAL, BL871E2-HI Evaluation Kit and the "A3DPDemo_SNK" without modifications. The problem was the same that described before.

Note that my bluetooth module is a BL871E2-HI from Telit, that was guaranteed by the manufacturer that the CC2564C inside the module is the same chipset offered by Texas.

Why do you think that is a firmware issue? Do you think that this problem is on "A3DPDemo_SNK" example? Because like I said before, when the problem occur, there is not any HCI command running in the A3D example (just the initialization is necessary).

Best Regards,

Vinícius.

0 Vincent Rodriguez over 5 years ago in reply to user4250105

TI__Mastermind 28285 points

Vinicius,

Sorry for the delay, no this issue is should not be caused by the default example. Let me see if i can figure out what the Telit part is, and make sure that isn't causing you issues.

BR,

Vince

0 Vincent Rodriguez over 5 years ago in reply to Vincent Rodriguez

TI__Mastermind 28285 points

Vinicius,

I wasn't able to find the issue in the part. Have you had found any luck debugging it yourself?

Best Regards,

Vince

0 user4250105 over 5 years ago in reply to Vincent Rodriguez

Prodigy 175 points

Hi Vince,

After that I realized that this problem is caused by the A3DP feature, I tried several configurations, but the problem never disappeared.

I asked for help to Telit, but they was unable to figure out what is the real problem.

Like I said before, I used the Telit development kit and the ST development kit and ran the Texas A3DP default example and the problem always occurred.

0 Vincent Rodriguez over 5 years ago in reply to user4250105

TI__Mastermind 28285 points

Vinicius,

Okay understood. I'll take a look again next week to see if I figure out a fix for you.

BR,

Vince

0 Vincent Rodriguez over 5 years ago in reply to Vincent Rodriguez

TI__Mastermind 28285 points

Vinicius,

Apologies for the delay. I am working on getting some firmware support to help you further.

Best Regards,

Vince

0 Vincent Rodriguez over 5 years ago in reply to Vincent Rodriguez

TI__Mastermind 28285 points

Vinícius,

Any updates on your side? Is this still an issue?

BR,

Vince

0 user4250105 over 4 years ago in reply to Vincent Rodriguez

Prodigy 175 points

Hi Vince,

I am working with Telit to figure out the problem reason.

I successful implemented the A2DP and this is a solution for while.

Thanks for your help.

BR,

Vinícius.

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CC2564C: CC2564C plus Bluetopia: A3DP Stream Interruption