MSP432P401M: Algorithm of lossless compression

Kaka

Guru 24520 points

Part Number: MSP432P401M
Other Parts Discussed in Thread: MSP430FR5994, CC3100

Hi TI Experts,

Do you know the 3rd Party to provide the lossless compression algorithm for MSP430 and MSP432?

Best regards.
Kaka

over 8 years ago

0 Keith Barkley over 8 years ago

Guru 42895 points

To compress what? Text? Music? Random numbers?

I have always been partial to RLL.

0 Chester Gillon over 8 years ago

Guru 92251 points

I haven't tried it myself, but on a quick search found Zlib packaged up for the ARM Cortex-M which may answer your question for the MSP432.

Depending upon which MSP430 you are targeting, the zblib memory requirements may be small enough for a MSP430 as well.

0 Keith Barkley over 8 years ago in reply to Chester Gillon

Guru 42895 points

You are assuming they want to compress text. Compression algorithms have to be tuned to the data being compressed or they are worse than useless.

0 Chester Gillon over 8 years ago in reply to Keith Barkley

Guru 92251 points

Keith Barkley said:
You are assuming they want to compress text.

One of the reasons I suggested zlib is that remember it being used to compress binary VxWorks images, which were un-compressed by the bootrom during system initialisation. However, I can't remember the typical compression ratio which was achieved on the binary VxWorks images.

Agree that knowing the type of data to be compressed would help in the selection process for an algorithm.

0 Kaka over 8 years ago in reply to Chester Gillon

Guru 24520 points

Hi
Thank you for your response.
Our customer would like to compress the low sensor data. They will get the four sensor data(16bit) with 2kHz and it will store on the MCU and send it via RF per 10s. In TI solution, the RAM size is not enough to store it.

Best regards.
Kaka

0 Chester Gillon over 8 years ago in reply to Kaka

Guru 92251 points

Kaka said:
They will get the four sensor data(16bit) with 2kHz and it will store on the MCU and send it via RF per 10s.

Am I correct in that the application needs to buffer 2 (bytes per sample) * 4 (sensors) * 2000 (sample rate) * 10 (duration in seconds) = 160,000 bytes in memory?

Rather than attempt lossless compression would a MSP430FR 5 or 6 series device with 256 KB of FRAM be suitable?

Not sure how much processing power and total storage the application requires.

0 Kaka over 8 years ago in reply to Chester Gillon

Guru 24520 points

Hi

Yes. Your understanding is correct.
I think that the largest FRAM size is best for their application like MSP430FR5994 in term of MSP430 device.
Also, they will transmit this data via Wi-Fi(CC3100). So, the MSP needs to add this driver and application.

Best regards.
Kaka

0 Chester Gillon over 8 years ago in reply to Kaka

Guru 92251 points

Kaka said:
Also, they will transmit this data via Wi-Fi(CC3100).

What about a C32xx device, rather than a CC3100 + MSP?

A C32xx has Wifi and a Cortex-M4 with 256 Kbytes of RAM for the application code + data,

0 Keith Barkley over 8 years ago in reply to Kaka

Guru 42895 points

RLL would be the best way for this kind of data, though more RAM is even better.

0 Evan W over 8 years ago

TI__Mastermind 40890 points

kaka,

Just to quickly jump in, in the next release of the SimpleLink MSP432 SDK, we will be releasing LZ4 compression support on the MSP432 for this type of application. Have you looked to LZ4 by chance to see if this would work?

info on LZ4: en.wikipedia.org/.../LZ4_(compression_algorithm)

0 Kaka over 8 years ago in reply to Evan W

Guru 24520 points

Hi Evan,

Thank you for your response.
No, we have not seen it. If the release schedule meet the customer schedule, we have a chance to introduce it to them.
Would you show me the next SDK release schedule?
Best regards.
Kaka

0 Evan W over 8 years ago in reply to Kaka

TI__Mastermind 40890 points

Kaka,

The next SDK release should be on or around Sept 15th. The training below is a preview of what it will be, which will be shipped with a software plugin type aspect to include LZ4 to other projects outside of OAD as well.

0 Kaka over 8 years ago in reply to Evan W

Guru 24520 points

Hi Evan,

Thank you for your support. I got it!
I would like to evaluate the LC4 library. So, I am waiting for the next SDK, but if possible, please provide the sample code for us.

Best regards.
Kaka

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MSP432P401M: Algorithm of lossless compression