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Thread: DSATX Brainstem Guidelines

  1. #1
    FLAC
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    DSATX Brainstem Guidelines

    Seems like a bunch of people are having issues with the brainstem.

    1. Don't Hot-Plug the brainstem! Hot plugging it causes it to hiccup the micro controller and causes weird results.

    2. If you do Hot-Plug it and you want it to behave normal, do the following:

    Take a Jumper and short pins JP1 A2 and B2. Be very careful when you do this. (Don't randomly short out everything with tweezers.) Shorting A2 to B2 will put the DSATX in the Reset state and reset any weirdness you created from hot-plugging your brainstem. You must then un-short it for it to come out of the reset state.

    3. You must enable writing if you are going to change parameters
    The when you want to set paramters you must (E)nable writing first. A capital E will then ask you if you want the DSATX to burn the EEPROM with new settings as you type. Yes. Then you won't get line feeds for every key as your typing an S command.

    4. F and O will turn on and off the Feed Diagnostic Output. If you type, you should see an echo. That means you have hyperterminal setup right.. It you type and you don't see anything, your not setup right. 9600 baud, 8 bits,1 stop bit, no parity, no flow control.

    5. The brainstem is plugged in right if it goes into the 4 pin connector without trouble. The circuit board of the brainstem should not hit the white housing of the connector.

    FYI:
    Hot-Plug means connecting the brainstem connector to the DSATX while there is 12V on VIN. When ACC is has 0V and VIN has 12V, that IS a Hot-Plug. You can also use use needle nose and pull the fuse (Or disconnect VIN from the battery) rather than shorting the pins to correct the problem.

    You can disconnect the VIN from the battery (for 5 or more seconds) and it will have the same effect as the reset.

    Here is a youtube:
    http://www.youtube.com/v/y9cSO2sNrxk
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  2. #2
    FLAC strohj's Avatar
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    this should be a sticky in here
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  3. #3
    Low Bitrate bungee91's Avatar
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    Quote Originally Posted by strohj View Post
    this should be a sticky in here
    I COMPLETELY agree, wish I would have known this last week before giving up and now having the damn thing unreachable for now under the back seat.
    Ya know I knew not to hot plug it, but for some reason I thought doing it while the computer was off but unit not unplugged would work, however I was dead wrong.
    Very helpful info

  4. #4
    Newbie epod86's Avatar
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    This was incredibly helpful, however, things have gone wonky on me (again). I hate to jack the thread for my own problems but I'm not getting much info on the DSATX and brain stem anywhere else.

    I had the hot plug-ish problem, however it pretty much seems that no matter what I try, ie which power state (vin only, vin +acc, dumb mode, whatever) i do a dsatx reset in, I cannot boot up with the brainstem connected. And I think I know why.

    I don't know if this is just my setup, but I always get a 'hiccup' when I first connect ACC. my mobo has a led that indicates when the start up voltage is present. It's a jetway 1.5ghz, same as in the store, fyi. Anyway, I turn on acc, and then the led blips and the fan whirs, theres a short pause, then the computer actually boots. I assume theres a stray command or signal somewhere that is grounding the start up signal before it is supposed to. I also get the led on when I first apply voltage, but no fan whirl which seem to indicate that there's no startup pulse. I'm wondering if the pulse is playing havoc with the onboards, and making the serial line upset. God knows that networking has taught me how wonky serial connections can be.

    Edit: in a recent occurrence, seems like dumb boot is failing me now as well. Out of at least a dozen trials, I've only got a single momentary fan whirl before dying to 5v only mode. Sigh.

    Edit 2: Decided to hook up the old power supply for some testing. the brain stem is 'sort of' works. getting a hand full of random characters spliced in with real ones from the diagnostic heart beat. Also some negative temps for A. This is starting to get aggravating. Alas til tomorrow, I'm exhausted.

    edit 3: well, after some thorough testing, it looks like the LCD (least com. denominator) is the brain stem. It will receiver a handful of correct diagnostic outputs from the controller, then all bets are off and the thing goes haywire. the weird thing is that the DSATX works fine when the brain stem is not connected. It is only once the stem is connected that the errors that it spits out become true. Case in point, I have never gotten a temp warning, not until the brain stem had some non-latin characters show up in the A field of the diagnostic, at which point I got the 5 led blink. It's like the brain stem is in series with the link between the diagnostic part and the logic/execuction part of the code/hardware. Really, one would think it was in parrellel, only as a reporting agent. When it goes wrong, the errors snow ball down the line and the DSATX ceases to function with complete random errors. I'm so confused and frustrated.

    errors so far:
    over temp (while reading a negative 000.0 temp or non-latin characters)
    VIN 'not good' (while readig 14v on the Vin)
    M and [ instead of N in the good/bad field
    random characters throughout
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  5. #5
    Newbie epod86's Avatar
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    So Some new occurances have happened. I got the DSATX working mostly this morning. But then I couldn't leave well enough alone.

    It seems like the diagnostic heart beat is the root cause of all evil. As I said above, it's errors seem to propagate into the firmware, causing the appropriate error signal / shutdown. When I booted it up this morning, the brainstem was working fine, but I was not getting any diagnostic feeds. So I polled the values manually using the "G" command, and everything was normal operating parameters. Then I enabled feeds with "F" and all hell broke loose. It was not instantly sending feeds like i thought it might, but it had never worked before that way, it had only spit out stuff once there was a state change. So then i set ACC high. I got my feed, and the errors along with it. Doh. Well, it seems that leaving it over night helped, I'll see if I leave it for a bit if it will come back. and I WILL NOT TOUCH DIAGNOSTIC FEED! EVIL I SAY! (end crazed section)
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  6. #6
    Constant Bitrate kwchan's Avatar
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    ahh...i didn't get the brainstem when i ordered mine. What will i miss without the brain?

  7. #7
    FLAC strohj's Avatar
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    you cant program the DSATX and you cant monitor its output etc without it..

    you dont need the brainstem per say.. but its VERY handy if you start tweaking things
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  8. #8
    Maximum Bitrate
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    Quote Originally Posted by zootjeff View Post
    2. If you do Hot-Plug it and you want it to behave normal, do the following:

    Take a Jumper and short pins JP1 A2 and B2. Be very careful when you do this. (Don't randomly short out everything with tweezers.) Shorting A2 to B2 will put the DSATX in the Reset state and reset any weirdness you created from hot-plugging your brainstem. You must then un-short it for it to come out of the reset state.
    Should this be performed with the Vin (constant) still hot/connected and the dsatx still connected?
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  9. #9
    FLAC
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    Quote Originally Posted by pancit175 View Post
    Should this be performed with the Vin (constant) still hot/connected and the dsatx still connected?
    Yes.

    Vin should have 12 volts. ACC having 12 volts is optional.
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