CC2560: Parameter configure setting for SPP upper limit throughput

Hsu Shihyin

Dear all:
We want to improv the SPP throughput, the current configure parameters as follows:
SPP_FrameSize=1000
SPP_RxBufferSize = 6000
SPP_TxBufferSize = 4000
MaximumNumberDataPackets=6
QueuedDataPacketsThreshold = 2
HCI UART baudrate = 921600

The rx throughput can reach to 408Kbps (=22852530bits/56s); the tx throughput can reach to 100Kbps( = 2Mbytes/200s).
For different remote baudrate (even 9600/115200/ 230400), the SPP tx/rx throughput is the same. Is the case really?
So, the throughput is dependent on FrameSize, SPP_RxBufferSize, SPP_TxBufferSize, not baudrate. really?
We test the throughput with different configure set(for FrameSize/SPP_RxBufferSize/SPP_TxBufferSize/MaximumNumberDataPackets/QueuedDataPacketsThreshold).
the result as follows:

	case 1	case 2
FrameSize	256	256
SPP_RxBufferSize	1536	2048
SPP_TxBufferSize	1024	2048
MaximumNumber DataPackets	6	8
QueuedData PacketsThreshold	2	0
Rx_throughput	408Kbps	346Kpbs
Tx_throughput	100Kbps	100Kpbs

For above result, improve the ratio of MaximumNumberDataPackets and QueueDataPacketsThreshold and improve the ratio of SPP_TxBuffer and FrameSize, but the throughput not improve, and the rx_throughput is not better. And, the throughput is also independent on remote baudrate.
Could provide us the configure setting for upper limit throughput?

ps. Bluetopia Version: 2.1.3 Changes
Thanks for your help and support.

Best regards,
Shihyin

over 12 years ago

0 Stonestreet One Support over 12 years ago

Mastermind 7225 points

Hello,

The throughput depends on all the factors(FrameSize, SPP_RxBufferSize, SPP_TxBufferSize and Baud rate) but once you hit a bottleneck with the MTU increasing the baud rate will not increase the throughput. However, your TX_Throughput is a bit low. We'll test with your parameters and get back to you.

Please take a look at this document as well if you already have not, processors.wiki.ti.com/index.php/CC256x_Bluetopia_Throughput

Best Regards,

Stonestreet One

0 Hsu Shihyin over 12 years ago in reply to Stonestreet One Support

Intellectual 360 points

Hello,

Thanks for your help first.
I have looked at the document, but it's seem different with us.
I can't use SPP_Set_Configuration_Parameters with 50/300/500, it will return the error code: BTPS_ERROR_INVALID_PARAMETER. And the default RFCOMM frame size is 128, not 50.
At "Data Transfer from Sample Application to MSP-430" table in the document, the upper limit is 254Kbps. But I can try to 408Kbps.
It's seem like two different environment, so the rx throughput maybe can over than 408Kbps?
And, is the tx throughput also too low at your test?

best regards,
Shihyin

0 Stonestreet One Support over 12 years ago in reply to Hsu Shihyin

Mastermind 7225 points

Hello Shihyin,

What platform and build are you using? Just to confirm to get on the same page first.

Best Regards,

Stonestreet One.

0 Stonestreet One Support over 12 years ago in reply to Stonestreet One Support

Mastermind 7225 points

it looks like you are using Stellaris. Have you tried to bump up the UART to 3M?

Best Regards,

Stonestreet One.

0 Hsu Shihyin over 12 years ago in reply to Stonestreet One Support

Intellectual 360 points

Hello SSO,

the platform and build is LM3S9BN6 C5 version and CCS4.2.5 we are using. We shouldn't bump UART to 3M. We use the highest HCI UART baudrate is 921600.

best regards,

Shihyin

0 Stonestreet One Support over 12 years ago in reply to Hsu Shihyin

Mastermind 7225 points

Shihyin,

Are you getting an error when you try to set the baud rate to 3M? What is the error that you are getting?

Best Regards,

Stonestreet One.

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CC2560: Parameter configure setting for SPP upper limit throughput