TomKraut 17 Posted May 16, 2012 Share Posted May 16, 2012 I call BS... Of course, TI might be able to disable JTAG functionality on their ICs, but it's not a documented feature. And why would they break out the JTAG header if it's unusable? And as for the MP3 licensing: if speedsthatbeat was able to substitute the BoosterPack .bin on the SD card with the one from the audio connected framework and it worked, there is no reason why it shouldn't work the other way around. So you could just as easily sniff around the MP3 code with an eZdsp5535. I guess it's just to discourage people from buying the ACTBP for DSP development, as it wasn't meant for that. Anyway, I just ordered one, will tell you in a bit if it works with my XDS100v2 ;-) Cheers TomKraut Quote Link to post Share on other sites
oPossum 1,083 Posted May 16, 2012 Share Posted May 16, 2012 Disabling JTAG on MSP430 is a documented and supported feature - they call it "blowing the JTAG fuse." It is done to provide "code protect." The C5000 DSP may have the same feature. Quote Link to post Share on other sites
TomKraut 17 Posted May 16, 2012 Share Posted May 16, 2012 Disabling JTAG on MSP430 is a documented and supported feature - they call it "blowing the JTAG fuse." It is done to provide "code protect." The C5000 DSP may have the same feature. You're right, there is something like that for the C55x. Your comment made me google a bit and I found this: http://e2e.ti.com/support/dsp/tms320c50 ... 49849.aspx There seem to be special C55's which have JTAG disabled, so it's possible that they were used. I will know for sure when I get my board, probably sometime next week. Worst case scenario, I will ask one of my colleagues to swap the DSP with one that has JTAG Quote Link to post Share on other sites
oPossum 1,083 Posted May 16, 2012 Share Posted May 16, 2012 Ahh, good find. That thread mentions grounding TRST will also disable JTAG - maybe they just did that rather then use the special chips. Quote Link to post Share on other sites
bluehash 1,581 Posted May 16, 2012 Share Posted May 16, 2012 Good find TK/Op Ahh, good find. That thread mentions grounding TRST will also disable JTAG - maybe they just did that rather then use the special chips. Hopefully. I have an XDS too, but no kit. I should buy one. If nothing, we can always swap chips. Quote Link to post Share on other sites
TomKraut 17 Posted May 16, 2012 Share Posted May 16, 2012 nTRST is connected to GND via a 4K7 resistor.... I don't think that's strong enough for grounding it, probably it's just to give it a defined value when no JTAG is connected. But then again, I'm not really a HW guy... Quote Link to post Share on other sites
TomKraut 17 Posted June 8, 2012 Share Posted June 8, 2012 Bad news: I finally got around to connecting my ACTBP via JTAG, but had no luck establishing a debug connection. Seems like TI told the truth and disabled JTAG on the C5535... SugarAddict 1 Quote Link to post Share on other sites
bluehash 1,581 Posted June 8, 2012 Share Posted June 8, 2012 Bad news: I finally got around to connecting my ACTBP via JTAG, but had no luck establishing a debug connection. Seems like TI told the truth and disabled JTAG on the C5535... Bummer. Well. Thanks for checking this out TK. Quote Link to post Share on other sites
GastonP 17 Posted June 9, 2012 Share Posted June 9, 2012 I really hoped TI would allow reprogramming the C5535 in the ATBP, by letting one to choose between keeping the MP3 code or mass-erasing it forever. The way it is, this boosterpak is not much more than a glorified Plane Jane Touch Boosterpak Quote Link to post Share on other sites
thanhtran 10 Posted November 1, 2012 Share Posted November 1, 2012 I was hoping that they would give option to run my own code. But it looks like this is an expensive mp3 player which can play specific mp3 file (vs. a $9 mp3 player which you can play files in sequence and not able to specify one that you want.) Quote Link to post Share on other sites
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