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Type: Posts; User: JKIM

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  1. Replies
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    I am using a custom board (with FlexIO2), but it...

    I am using a custom board (with FlexIO2), but it looks like the standard T4.1 should have enough exposed consecutive pins on FlexIO3 starting with AD_B1_00 for the 16bit bus, plus 4 pins for D/C, WR,...
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    I have used the FlexIO with 16bit parallel...

    I have used the FlexIO with 16bit parallel interface, based on the mculcd demo from the NXP SDK.

    It works well, although I did have to tweak it a bit.
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    I had good luck with umm_malloc: ...

    I had good luck with umm_malloc: https://github.com/rhempel/umm_malloc
  4. OK, I have gotten somewhat further. I was...

    OK, I have gotten somewhat further.

    I was able to get ThorsSerializer working with SdFat (Teensy4 beta, using SDIO) for serialization at least.

    I had to change SdFat to use custom class...
  5. Yes, that is definitely an option. My member...

    Yes, that is definitely an option. My member types are fairly simple, ints, pointers and vectors, so a library is maybe a bit of overkill in most cases. But I wanted to check for recommendations...
  6. Thanks Paul. I am trying to accomplish the...

    Thanks Paul. I am trying to accomplish the serialization of a large amount of application data (MIDI) from an external RAM chip onto an SD card for long term storage and data exchange. Preferably...
  7. Serialize large objects for storage on SD card?

    I have been researching on the best way to serialize large objects for storage on the SD card of Teensy 4. Specifically ones that don't have to store a DOM into a temporary variable, before...
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    Is there a recommended approach to use SdFat...

    Is there a recommended approach to use SdFat along with existing newlib stdio functions? I was able to get SdFat to work by renaming all of the classes and members to something other than the stdio...
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    C++ streams with ChaN FatFS?

    I have been banging my head on this for days, especially since I would have thought it would be a common question!
    I'm trying to serialize some objects to store them onto the SD card in a Teensy4.
    ...
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    OK, Thanks for confirming. It looks like the...

    OK, Thanks for confirming. It looks like the linker file needs to have modifications to include the code for the flash memory drivers of the EVKB
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    Were you able to get an Arduino built .hex file...

    Were you able to get an Arduino built .hex file to load into the EVK?
    I am trying to use a J-Link to flash the EVK with an Arduino hex file, it looks successful, but does not execute successfully....
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    Here's the TB-3: Device...

    Here's the TB-3: Device VendorID/ProductID: 0x0582/0x017B (Roland Corporation)

    I can get my T3.6 fired up with the host implementation and put the analyzer on it when there is a test...
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    I took some quick Beagle captures of MIDI...

    I took some quick Beagle captures of MIDI incoming from the TB-3, it looks like pretty standard USB MIDI, although there is a second message following the standard message (for NOTE ON/OFF at least)....
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    I have a Beagle USB protocol analyzer and Roland...

    I have a Beagle USB protocol analyzer and Roland TB-3, TR-8, MX-1 (no VT-3 unfortunately) if it may help to identify if one of the vendor specific interfaces uses standard USB MIDI packets in some...
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    I believe the Roland devices use proprietary...

    I believe the Roland devices use proprietary drivers (they aren't class compliant) so you won't be able to use them with this host implementation
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    I am also looking at USB HOST MIDI implementation...

    I am also looking at USB HOST MIDI implementation and would love to build out *sending* MIDI (it currently only receives MIDI input).
    I couldn't find any of the USB HOST device drivers that send...
  17. Thanks for the comments. My previous experience...

    Thanks for the comments. My previous experience for "displays" is with 7-segment LEDs, which are obviously much simpler. I guess I'm not sure about how the underlying graphical assets are...
  18. Using a display in a "real" design... best approach for MCU control?

    This may be a fundamental or "it depends" type question, but I haven't found any guidelines or benchmarking for the topic.

    I am thinking about using a graphic display in my next project, something...
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    powering down gracefully?

    Is there a standard way to handle power down on the Teensy/ARM?

    What I mean by that is the user will usually cut power immediately with a switch, if you don't have some type of "soft power...
  20. Yes, there are situations that arise where the...

    Yes, there are situations that arise where the teensy can't be reprogrammed without pressing the button... See my previous thread about windows:...
  21. I am still getting quite a few user reports...

    I am still getting quite a few user reports around this error.
    I think it may be related to the fact that the user is using the loader for the first time, and using a key combo to start the...
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    Thanks Paul, I use NetBeans and a makefile...

    Thanks Paul, I use NetBeans and a makefile directly with Teensy loader and the files from an (older) Teensyduino install. If you have a memory of where/what the fix was, it would help, I will try...
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    I have a report from a user with a similar...

    I have a report from a user with a similar situation (USB-MIDI, Teensy 3.1 on Mac OS X El Capitan 10.11.2)
    I had them trace the USB enumeration using USB Prober and the device is not enumerated...
  24. OK, I created a Win7 64 bit VM for testing and it...

    OK, I created a Win7 64 bit VM for testing and it works every time...
    In the meantime I had a few more customers get the same failure on Win7, so I will try and get a physical Win7 box built. ...
  25. Thanks Paul, I need to see if I can actually...

    Thanks Paul,

    I need to see if I can actually recreate the issue using my board... I don't have immediate access to a Win 7 machine.
    If I can find a Win7 box I hope to gather more information...
  26. Windows 7 (64bit) standlone teensy loader stalls during upload sometimes?

    Hey all,

    I have a product that uses the teensy 3.1 bootloader chip on a custom board. My customers are instructed to download the teensy loader app when it is necessary to upgrade the product.
    ...
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    Well, I did the "sensible" thing and disabled DSE...

    Well, I did the "sensible" thing and disabled DSE in the pinMode function for everything.
    I'm not driving any major loads with my output pins, so hopefully it should not be a problem.

    Now my...
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    Wow, even better! thanks! I turned off the...

    Wow, even better! thanks!

    I turned off the drive strength for SCK and MOSI and get a considerable noise improvement.

    I see that PORT_PCR_DSE is being set for any pins designated as output in...
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    Hmm, thanks for the tips... I was able to get...

    Hmm, thanks for the tips... I was able to get some major improvement by adding even more decoupling 100nF caps on a relatively long trace for the rails and SPI bus. Putting a 20MHz bandwidth limit...
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    Noise on GND from SPI (SCK)... what is normal?

    I am probing the output of my Teensy 3.1 board which is driving driving some SPI peripherals... Everything works as expected, but I do see some very high frequency noise on the power rails, which is...
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    Do you happen to have an example of the...

    Do you happen to have an example of the per-project makefile for NetBeans with Teensy 3.1?

    In the example are a lot of relative paths, which don't match up with my NetBeans paths. This is just to...
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    Something like this may be a good candidate:...

    Something like this may be a good candidate:
    1828

    Thanks
    JK
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    Thanks for the suggestions. The isolator I'm...

    Thanks for the suggestions.
    The isolator I'm using is the ADuM 3160 on the PCB, so a cable adapter would need to be sourced with bare leads on one end.
    Similar to this, but for micro USB...
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    Using alternate USB connection?

    Hello,

    I am considering using Teensy 3.1 inside of a (small scale) commercial product. This seems to make sense in terms of time and cost for a short run product.

    The one major hurdle I need...
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