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2013-09-02 15:09 <larsc> great a SPI slave that doesn't reset it's SPI transceiver statemachine when CS goes high. Have a spurious clock cycle once, all future transactions will be off by one clock cycle :/
2013-09-02 15:12 <wpwrak> but it's very robust against CS glitches ;-)
2013-09-02 15:17 <larsc> yea ;)
2013-09-02 15:19 <ysionneau> ahah
2013-09-02 15:21 <larsc> well, it ignores SCK as long as CS is high, so you'd have a similar problem if you had a glitch on CS at the right time
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2013-09-02 15:51 <wpwrak> ah, but what are the odds :)
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2013-09-02 16:08 <larsc> right now I'm wondering how to fix this, the reset is the deserted long before CS and SCK become untristated and of course no testpoints where you could attach a pull-up to CS
2013-09-02 16:08 <larsc> de-asserted
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2013-09-02 16:34 <wpwrak> device doesn't have a reset-in pin either ?
2013-09-02 16:35 <wpwrak> maybe you can implement some algorithm that determines the bit offset by a string of commands and evaluating the responses for the possible offsets
2013-09-02 16:35 <wpwrak> s/by a/by sending a/
2013-09-02 16:35 <qi-bot> wpwrak meant: "maybe you can implement some algorithm that determines the bit offset by sending a string of commands and evaluating the responses for the possible offsets"
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2013-09-02 16:43 <larsc> the reset pin is hardwired to the power good signal, luckily that's going to change in the next rev
2013-09-02 16:44 <larsc> I only can do multiples of 8 SCK cycles
2013-09-02 16:44 <larsc> so once stuck, forver stuck
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2013-09-02 17:02 <wpwrak> no GPIO on the "good" side of that interface ?
2013-09-02 17:05 <kyak> i might be late, but anyway: http://haxit.blogspot.com.es/2013/08/hacking-transcend-wifi-sd-cards.html
2013-09-02 17:05 <kyak> very cool
2013-09-02 17:10 <larsc> kyak: Linux on your SD card?
2013-09-02 17:10 <larsc> wpwrak: kind of, a full fpga, but well I'm lazy ;)
2013-09-02 17:10 <larsc> I don't want to implement some custom recovery methods
2013-09-02 17:11 <wpwrak> lame ;-)
2013-09-02 17:11 <larsc> strangly enough it works if I add a pull-up inside the fpga, even though the pin is actively driven
2013-09-02 17:12 <larsc> at least that's what I assume
2013-09-02 17:14 <wpwrak> kyak: neat :)
2013-09-02 17:14 <larsc> but since I'm just routing a signal from the SoC through the fabric how knows how they hooked up the signal to the fabric internally
2013-09-02 17:16 <kyak> yep, it's a 400 Mhz ARM, 32 Mb RAM and Wifi in an SD card, completely hackable
2013-09-02 17:17 <kyak> (not because it was made hackable, but because it contains so many holes)
2013-09-02 17:19 <kyak> wpwrak: i, by the way, bought another uSD-SD adapter. But before i start with it, i found an old 32Mb SD card to experiment with )
2013-09-02 17:19 <kyak> i realized i need more thin wires as well.. mine are too thick
2013-09-02 17:20 <kyak> and maybe i can finish this project with the iron i have
2013-09-02 17:24 <wpwrak> maybe ... but you really ought to visit the electronics stores. this stuff isn't THAT expensive. you'll easily spend more on things you damage, oddball adapter boards, etc., than on a decent soldering iron
2013-09-02 17:28 <kyak> yep. i already took notice of one model
2013-09-02 17:30 <wpwrak> good :)
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2013-09-02 18:01 <larsc> now lets hope that it takes notice of you as well and then you two can live on happily ever after
2013-09-02 18:07 <kyak> -)
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