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Hi Casainho,Thanks, you answered my question. I was doing the same thing.I think it's the sd_crc7 function.Did you log a chart and want to just have a constant check at all times?You must be trying to add a second card through the spi secondary. I think there is an e-book (free in pdf format) about this in sd/mmc subject.I thought you were using definitions to use the atmel library?You may want to make the data from the sd to be global so the other peripherals can use the data. Just be sure to kill the pointers after the other peripherals use the data.
I looked at your screen and saw that the disk size is at 7.59GB. I see why you need a different protocol. May I ask what kind of media are you using?This may help for crc16 function. I didn't go though them yet.
Hi, Guys! Your project looks great... My congratulations!
But, if you work to make' em best - you must use best audio hardware at fist!!!!!!!!!
I look at short at the project and see that you plan to use TI TLV320 codec. I think that it is a waste of money and time! If doing so why just don't buying used Cowon X5/M5 - that dap USE SAME CHIP, looks great, price is as low as it can? By the way - it sounds cheap!Right now I'm working at the X5 Xmod project: I m use a half of X5 hardware, rockbox software and almost rebuilt all sound path!Audio path hardware would be: IIS from CF5250 (I'm appreciate any help with rebuild in rockbox with up to 24bit word IIS) > PCM1708 > AD8620 i/u converters in balanced configuration (4mA inputs into 2V outs) > TPA6120 (2v inputs to the +/-4V outputs with max current capacity up to 300mA whit a slew rates up to 900V/uS!!!) All digital-to-sound chips supplied with +/-5V voltage from high efficiency DC/DC converters fed from a single Li-Po 3.3V cell. Low-ESR Sanyo Os-COn caps, ferrite beads for filtering and so on.. I think that novaday such signal path is THE BEST/SIMPLE EVER! Right now I'm working at the printed circuit board layout, to suit best available quality and physical X5 compartment. I think it could to be a sound killer DAP!
Sounds nice your project... can you send the link so we can read more about it?Right now we are working with a AVROpendous so he will design, make, assembly and sell online (on Ebay) the hardware. We don't have all the info updated online... there is time missing.Don't you want to join us? we need all the knowledge and developers as possible...And later we can work on Rockbox audio drivers for having the 24 bits PCM ;-)
I' m from Russia, just haven't much possibilities for cooperation..
Just some thoughts:At first - you must to decide for what and for whom is your project?Make just another ugly MP3 player with decent sound at the price of all-in-one china SoC MP4 player - isn't a silly thing?
Second, I just HATE compressed sound! That is because I'll go with rockboxed device...
Right now in my remodded X5 presents over 80 CD Images in lossless nor one in lossy!So, I'm not interested in MP3 player in a way you go. I don't want to waste a time and money in a thing with guaranteed poor sound potential without any simple way for growing...Instead , I had searching the most "potential in sound" DAP available at the market and that is X5, i think...
Then I though: what I could remode to reach the best sound available from the portable device? As usual a weakest thing is a sound path ! So right now I'm working on it. Overall technical aspects I wrote already in the post above.When it will be completed, I could offer some more information, or may be printed circuit boards, or assembly kits, or something else for people who want to reach the best with their X5...Possibly my construction could be used as outer DAC/Headphone AMP for almost any DAP based on the processor AND outer codec chips (could to be connected except original codec via I2S bus)...that is just a thougths right now...
Unfortunately I'm not a programmer, and just cant share 16bit limits in rockbox...if you could help, i'll thank you!
What is that X5? is that Open Hardware?
Quote from: casainho on April 21, 2009, 06:12:08 AMWhat is that X5? is that Open Hardware?I think he is refering to Cowon's iAudio X5: http://www.dapreview.net/p/content/content.php?content.201
So, I'm not interested in MP3 player in a way you go. I don't want to waste a time and money in a thing with guaranteed poor sound potential without any simple way for growing...
But right now you are putting your time and money to hack some hardware that is not different from the general other ones. You are hacking a closed source hardware, which I think it limit the acess to people for your work.Don't you really think that a closed source hardware have more "poor sound potential" than an Open Hardware one which everyone can improve easily??I would love to have your board schematics and documentation for future reference, who knows if we can reuse it? :-)
Quote from: casainho on April 21, 2009, 08:31:22 AMBut right now you are putting your time and money to hack some hardware that is not different from the general other ones. You are hacking a closed source hardware, which I think it limit the acess to people for your work.Don't you really think that a closed source hardware have more "poor sound potential" than an Open Hardware one which everyone can improve easily??I would love to have your board schematics and documentation for future reference, who knows if we can reuse it? :-)Above I was talking about Cowon X5, of cause.I choose this one also because of it's hardware was hacking almost to the end by rockbox guys. So we can call it "OPEN".
And you are just in the beginning...to make a thing that is ever equal to the X5 you'll must work really hard and spend more, more time...Researching of Hardware..sotware..programming, design of the ergonomic and aesthetic body... Making the body at the end!
Your selected components are fine for the exception of the power consumption. TPA6120 uses 10v or more, TDA2822 would be a better choice for me. PCM1798 uses 5v analog and 3v3 digital, I like 3v3 not the 5v. AD8620 uses 5v, from the same company an op-amp can use 3v3. I prefer a codec with an op-amp. Your choices are very good ones, since they give schematics, I like that myself.
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