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    hmmmm.... I guess my T4 arrived just fine, now...

    hmmmm....

    I guess my T4 arrived just fine, now I can start figuring out what exactly I just unpacked
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    It's UPS via cologne.

    It's UPS via cologne.
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    I imagined that too. The customs imagine...

    I imagined that too. The customs imagine differently.
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    My T4 is stuck in customs because they want me to...

    My T4 is stuck in customs because they want me to name a "realistic value" for the device. Any pointers from people in germany who successfully got their T4? What did you suggest to them? Any idea...
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    Before I dig deeper: - is there a chance that I...

    Before I dig deeper:
    - is there a chance that I can use the T4 to control a TFT with 6800- or 8080-style parallel interface? The display I'm considering needs at least 8 data lines. 9, 12, 16, 18...
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    I like the idea of having a cpu and an fpga in...

    I like the idea of having a cpu and an fpga in one package, and many of those are available. Maybe it's just a matter of picking the right line? That way we wouldn't need to think so much about which...
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    Also keep in mind that, if you create a custom...

    Also keep in mind that, if you create a custom teensy PCB, you can move the bootloader chip to an external (non-automotive) programmer PCB. Maybe not a nice move towards Paul, but as far as I...
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    What "same" are you interested in?

    What "same" are you interested in?
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    I don't think the HC4050 is really limiting...

    I don't think the HC4050 is really limiting speed, it's the SSD1351.
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    I can confirm at least 12 MHz clock on a...

    I can confirm at least 12 MHz clock on a breadboard with the adafruit 1.5 OLED breakout board, which uses the SSD1351
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    The SSD1351 Max SPI clock speed is documented in...

    The SSD1351 Max SPI clock speed is documented in the datasheet but I don't remember the exact value. It's not very high though
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    I think it's going to be a bit more difficult....

    I think it's going to be a bit more difficult. Both libraries (the standard Adafruit_MCP21037 and your custom Adafruit_MCP210371) define the same class named "Adafruit_MCP23017", so the names clash....
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    Please also show us the modified library code....

    Please also show us the modified library code. It's part of the code we can't get from any other source.
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    You just do it, really. SCL0 and SDA0 belong to...

    You just do it, really. SCL0 and SDA0 belong to Wire0, SCL1 and SDA1 belong to Wire1 (they are broken out to the bottom layer, though, so they are harder to reach). You can use both busses in the...
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    Regarding the two datasheets: the smaller one...

    Regarding the two datasheets: the smaller one each is not a slimmed down version of the other, they have a completely different scope: one specifies all the electrical details (speeds, currents,...
  16. I plan to support all teensy 3.5 SPIs and even...

    I plan to support all teensy 3.5 SPIs and even ordered the board for just that. Now I just need to find time to do it.

    Regarding oddly sized transfers: it would probably make sense to write a...
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    Please post the code that is not working (and use...

    Please post the code that is not working (and use code tags around it to make it more readable).

    Are you sure that the receiver works reliably at 3.3 V? Do you have access to a scope to check if...
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    https://github.com/duff2013/Snooze/issues/41

    https://github.com/duff2013/Snooze/issues/41
  19. I ordered the board mentioned in the first post...

    I ordered the board mentioned in the first post and hooked it up to a Teensy 3.6 with VUSB cut. No regulator.

    My test sketch calculates Vdd by measuring the internal 1.2V reference and then...
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    I'd like to read data from a slave...

    I'd like to read data from a slave asynchronously. Your API explanation seems to indicate that this is possible using sendRequest(address, length, i2c_stop), but I can't find an example. There seems...
  21. we might add the constants to the header as well,...

    we might add the constants to the header as well, to make the magic numbers disappear

    here it is: https://github.com/PaulStoffregen/cores/pull/255
  22. oh apparently I totally got you wrong there....

    oh apparently I totally got you wrong there. You'll need some template trickery here:...
  23. I have not tested this, but placement new comes...

    I have not tested this, but placement new comes to mind: http://en.cppreference.com/w/cpp/language/new

    I've even found an example:https://stackoverflow.com/a/4756306/692359
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    I'm really not sure what you are aiming for ...

    I'm really not sure what you are aiming for

    some graphical output with a touchscreen so that the user can interact with your application, or
    a way of graphically "programming" your application?...
  25. Teensy 3.x SPI hardware bugs - trying to get an overview

    Back then there was a bug in the Teensy 3.0 chip which made the SPI's hardware chip select pins useless for DMA usage. IIRC I read somewhere here that this has changed in newer chips.

    Does anyone...
  26. disclaimer: I didn't test that suggestion. If the...

    disclaimer: I didn't test that suggestion. If the RAR library is trying to be smart about duplicate analog pins, we have to use RAR::update(value) which allows to use values obtained from anywhere,...
  27. responsiveAnalogRead (short: RAR) should be fine...

    responsiveAnalogRead (short: RAR) should be fine as long as it's used properly. If you feed every value into the same RAR object, it won't work for the reason you stated. Instead, create one RAR...
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    From the schematic it looks like PTD10 is not...

    From the schematic it looks like PTD10 is not broken out. If you really need it, you'll have to create your own custom PCB (which will be hard for a BGA package). You can't really "adjust pins" since...
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    Is this only for products that are specifically...

    Is this only for products that are specifically designed for the Teensy pinout or also for products which have been found to be a good match in general?
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    Patched yield() declaration...

    Patched yield() declaration (https://github.com/PaulStoffregen/cores/commit/2d7cf7acddd4d2d5fcf7e13fe98c3f8b8151bf81) also helps with the Zilch library (cooperative multitasking).
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    I just unpacked a new SD card and plugged it into...

    I just unpacked a new SD card and plugged it into a Teensy 3.6.

    SdInfo:

    Assuming an SDIO interface.

    type any character to start
    init time: 126 ms

    Card type: SDHC
  32. Well if it's really way out of whack the chip...

    Well if it's really way out of whack the chip will probable release magic smoke, wouldn't it?
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    It only took about two years to convince you:...

    It only took about two years to convince you: https://forum.pjrc.com/threads/28155-Why-is-SPI1-an-extra-class?p=68641&viewfull=1#post68641

    Would probably be longer if this was standard arduino...
  34. The 511 byte limitation is nasty but won't be a...

    The 511 byte limitation is nasty but won't be a show stopper. Maybe I can even get rid of the 32767 byte limitation with the same "reloading pattern" in my transfer descriptors...

    I've ordered a...
  35. Looks like I need to get a t3.5 after all...

    Looks like I need to get a t3.5 after all...
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    DMASPI was updated and tested on a T3.6 (SPI0 and...

    DMASPI was updated and tested on a T3.6 (SPI0 and SPI1). Thank you for creating a common base for the SPIs, Paul!
  37. Teenyduino 1.39 release, further development

    Now that teensyduino 1.39 is released and KurtE pull-requested me towards the fact that there's apparently a common base to all SPIs, some changes to the code were needed.

    What I've done now:

    ...
  38. Success (apparently)!

    I think I fixed it:

    enable VREF_OUT and low-power buffer
    wait for VREF_OUT to stabilize



    #include <ADC.h>

    ADC* adc;
  39. Problem persists, this is the code I've tried: ...

    Problem persists, this is the code I've tried:

    #include <ADC.h>

    ADC* adc;

    void setup() {
    // put your setup code here, to run once:
    Serial.begin(9600);
    adc = new ADC();
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    Just to chime in: Some time ago I wrote an...

    Just to chime in: Some time ago I wrote an implementation of the observer pattern called signals: https://github.com/crteensy/Signals

    You can create a signal object that others can connect to....
  41. No other opinions on this?

    No other opinions on this?
  42. It seems that for the teensy 3.6, VREF_OUT can...

    It seems that for the teensy 3.6, VREF_OUT can only be measured with the second adc on channel 18 (chapter "ADC1 connections/Channel Assignment"). I'll try that later today when I'm back home.
    ...
  43. Same effect when breaking it into two operations....

    Same effect when breaking it into two operations.

    The usage of analogRead is mentioned in the first post of this thread, in section "Other conversion sources". This usage is also in the datasheet,...
  44. So I picked a board and ran the following: ...

    So I picked a board and ran the following:

    #include <ADC.h>

    ADC* adc = new ADC();

    void setup() {
    // put your setup code here, to run once:
    Serial.begin(9600);
    }
  45. @jwatte: I don't want to use the internal...

    @jwatte: I don't want to use the internal reference as reference for the ADC. You're right in that I'd have to scale down the supply voltage then. My plan was different: VDD (battery voltage) is used...
  46. Not quite. I want to run the teensy off a battery...

    Not quite. I want to run the teensy off a battery with not more than 3.6 V, probably without the regulator in between. So the controller's supply voltage is not known as it would usually be. That's...
  47. Before I break things: I'd like to measure the...

    Before I break things: I'd like to measure the supply voltage, which won't work without some fixed reference.

    Can I do a conversion from ADC_INTERNAL_SOURCE::VREF_OUT (10-bit result for 3.3 V...
  48. OneHorse's charger would have been a good choice...

    OneHorse's charger would have been a good choice for a LiPo battery, but this is a different chemistry. The MAX1551/5 chips stop charging at 4.2 V which is far above what a LiFePo4 battery would like...
  49. Powering T3.2 or T3.6 from a single LiFePO4 battery

    Hi all,

    I'm looking at the schematics, trying to figure out how to supply a Teensy 3.2 or 3.6 from a single LiFePO4 battery. Some random things to start with:

    The battery will have its own...
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    I'm working on an update for DMASPI to work with...

    I'm working on an update for DMASPI to work with the refactored SPI classes.
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