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Discussion Groups | TMS320C55x | TMS320vc5509 MMC/SD File layer suggestion
Technical discussions about the TI C55x DSPs (including the c5501, c5502, c5503, c5507, c5509, c5510 and OMAP5910).
TMS320vc5509 MMC/SD File layer suggestion - peejayblack - Dec 11 14:23:00 2003
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Anyone The 5509 supports MMC/SD. Has anyone implimented this? Any suggestions on a file system layer. I want to be able to read the card from a COT's card reader on my PC. 5509 MMC/SD File layer suggestion Phil Black |
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Re: TMS320vc5509 MMC/SD File layer suggestion - Paul Shepherd - Dec 12 14:04:00 2003
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Hello Phil, What timing you have - I just now have a reliable implementation of something close to what you want!! Here's where you need to start: 1) Get the DDK (version 1.1) from TI. You can get this using the automatic update tool. This includes a IOM mini-driver for using GIO commands to read/write to the mmc. This will provide a mini-driver on which you can build a filesystem driver. I suggest you forget ALL OTHER APP NOTES and just use the DDK, unless you don't want to use DSP/BIOS (in which case I can only say "GOOD LUCK"). 2) TI has developed a FAT filesystem driver that sits above the DDK. My understanding is that it is currently Beta only. Therefore, you will not find it with automatic update. Ask your TI FAE for a copy. 3) The above will actually not work TODAY, due to a bug in the DDK that TI is working hard on as we speak. Actually, to be fair, the routines DO work for me, but only for <= ~20,000 cycles and then they hang. My current solution?? a) I wrote routines to interface with the mmc in SPI mode using GPIO lines. b) I wrote a simple filesystem layer above that. c) I use "dd" on a pc to do a raw data dump from the mmc to my pc using a card reader. d) I wrote a pc program to implement the simple filesystem layer to extract the raw data dumped with dd. I am also very curious - is anyone else using the MMC and if so, are they having any problems??? .... Good Luck, ..... Paul --- In , "peejayblack" <peejayblack@y...> wrote: > > Anyone > > The 5509 supports MMC/SD. > Has anyone implimented this? > Any suggestions on a file system > layer. I want to be able > to read the card from a COT's > card reader on my PC. > > 5509 MMC/SD File layer suggestion > Phil > Black |
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Re: Re: TMS320vc5509 MMC/SD File layer suggestion - Indrek Rebane - Dec 12 15:10:00 2003
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Hi Paul, Paul Shepherd wrote: > I am also very curious - is anyone else using the MMC and if > so, are they having any problems??? We are using both, MMC and SD. There have been lots of problems in past, but most of them are solved now. We are not using GIO infrastructure as it became a major performance bottleneck for our application. Also, native mode is used for accessing cards, including 4 datalines for SD. Greatest improvements were after getting DMA working. Also, documentation from TI is very misleading and outdated. Indrek -- Indrek Rebane | Borthwick-Pignon Electronics Engineer | Tartu Science Park Phone: (+372) 7 302 641 | Riia 185, 51014 Tartu Fax: (+372) 7 383 041 | Estonia | www.bps.co.ee |
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Re: TMS320vc5509 MMC/SD File layer suggestion - sks_dsp - Dec 22 21:57:00 2003
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Phil, While it's not quite what you are looking for… We have developed a IDE daughtercard and a FAT32 file system for the 5510 (67xx coming soon): http://focus.ti.com/catalog/docs/thirdpartysoftwarefolder.tsp? softwareId=4384 We've implemented a version of fopen(), fclose(), fread() and fwrite(). There is currently a one file open at a time limitation. With a 5510 we can stream about 1Mbyte/sec to a hard drive. We have no problems recording hours of 16 bit 48Khz stereo without glitches. It is straight forward but not trivial to write the FAT32 code. Give us a call if you would be interested in contracting this out. We designed our daughtercard to allow harddisks (tested with 60G 2.5" drives) or compact flash cards (>=32M). You can collect data using the DSP and then plug the drive or card into your PC where it is seen as a FAT32 drive. Another nice feature we added to our daughtercard is a connector to hold a small IDE<->USB converter card like you find in a usb external harddisk. This probably isn't a big issue with the 5509 (which has a usb interface) but with other DSPs it allows us to mux the bus and access the drive via usb without opening the box to swap the drive. A few notes from our experience: For streaming applications, we needed to be very careful with frame rate and the size of the buffers. You must be aware of the hard disk worst case seek times. You need to remember that not only are you read/writing data to the drive, but you must also keep the FAT up to date. We buffer complete sectors of data and our normal operation is with an unfragmented drive. We restrict to one open write file so the current FAT sector can be cached. Once you've solved these problems, it changes your point of view when you can capture gigabytes of real time data with your DSP. Let us know if you'd like further info. You can reach me at my yahoo e-mail () -Shawn Steenhagen Software Specialist Applied Signal Processing www.appliedsignalprocessing.com --- In , "peejayblack" <peejayblack@y...> wrote: > > Anyone > > The 5509 supports MMC/SD. > Has anyone implimented this? > Any suggestions on a file system > layer. I want to be able > to read the card from a COT's > card reader on my PC. > > 5509 MMC/SD File layer suggestion > Phil > Black |
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