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  1. Things I notice using the GSL1680 touch screen. ...

    Things I notice using the GSL1680 touch screen.

    The GSL1680 touch chip is only a touch sensor. It does not encode pressure information .

    When detecting more than 1 finger information, position...
  2. @Keith_M Would you please clarify the

    @Keith_M Would you please clarify the <half of screen. . . . > Is that like top/bottom half or every other one, (even/odd lines only)? I'm doing a Teensy 3.5 project and will look at that.
  3. Perhaps looking at how the on board SD Card...

    Perhaps looking at how the on board SD Card operates on T3.5 & T3.6 could shed some light on what is required to implement that.
  4. Could you clarify the 4x SPI bit? are you...

    Could you clarify the 4x SPI bit? are you talking 4 seperate SPI ports -OR- were you thinking about an SPI port with 4 data lanes?
  5. I mostly use the displays from buyDisplay.com. ...

    I mostly use the displays from buyDisplay.com.

    tftm043 4.3" diag with ft5206 cap touch controller
    tftm050 5.0" diag with GSL1680 cap touch controller
    tftm070 7.0" diag with ft5206 touch...
  6. That looks great. What did you use on the PC...

    That looks great. What did you use on the PC side to work the image data?

    Thanks.
  7. How would I configure A14/DAC as an analog input?

    On a Teensy 3.2, is there any special way to configure the A14/DAC pin as an analog input? I've seen posts to use analogWrite to set the value but is there any special setup to configure it as an...
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    Although I have zero mileage / experience using...

    Although I have zero mileage / experience using the T4.x I would suggest adding an electrolytic capacitor to the regulated side of the Teensy power grid to reduce the effects of the power transient...
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    Code to do writes to EEPROM ...

    Code to do writes to EEPROM


    //EEPROM_I2C_Write Use to create EEPROM contents
    // writes are always in groups of 5-bytes * 25 repeats
    // last 3-bytes on page are left un-programmed
    // p6 is...
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    There are several libraries for I2C EEPROM on...

    There are several libraries for I2C EEPROM on Github. I looked at them for reference purposes when employing a 24C512 to hold firmware for the GSL1680 touch controller. Not too difficult to do. ...
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    You don't give us much to work with. Is the...

    You don't give us much to work with. Is the Teensy being mounted on another PCB where you could use tiny spring contact pins? Could you pick the +5v from the Vin pin on the corner of the Teensy...
  12. I'm doing something like this with a Teensy 3.2. ...

    I'm doing something like this with a Teensy 3.2.

    In your drawing you have the PowerBoost 5v output going to the T4.1, so it (may) only gets recognised as USB device when it is powered on. Maybe...
  13. I reinstalled/updated both the IDE (1.8.13) ...

    I reinstalled/updated both the IDE (1.8.13) and Teensyduino (1.53) and as suspected, the problem resolved itself.

    Perhaps (???) it was related to the issue discovered here: ...
  14. The display is wired as a 5v unit. The...

    The display is wired as a 5v unit.

    The circuitry is on two (2) different PCBs with traces no longer than 4-inches.

    Screen resolution set for 480x800.

    Since the T32 and T35 have a...
  15. Teensy 3.2 not working with RA8875 display

    I'm working on a new project that uses an RA8875 display and am having problems with the display not functioning. It is a 5-inch Buydisplay.com ER-TFTM050 that uses the GSL1680 touch screen which...
  16. Are you using 10k pull ups on the CS lines? ...

    Are you using 10k pull ups on the CS lines? Initializing the SD card before the display to be sure it is in SPI mode? Show us your wiring and code as it helps us to help you.
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    Will that sensor act as you expect it to? Do...

    Will that sensor act as you expect it to? Do you have an optical mouse? Try running your hand around it and see how well you may control the cursor position. Try this at different distances. ...
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    Is there a common ground connecting those...

    Is there a common ground connecting those seperate proto boards?
  19. I believe there is about 250mA available from the...

    I believe there is about 250mA available from the 3.3v regulated by the Teensy 3.2. Your calculations seem correct. I2C talks to only one (1) sensor at any time. Decoupling capacitors...
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    I may be wrong here, but I don't recall Wire.h...

    I may be wrong here, but I don't recall Wire.h supporting the other I2C busses. I do believe it can be edited and renamed as wire1.h to support each additional I2C bus.
  21. Just in case someone else needs to use a bunch of...

    Just in case someone else needs to use a bunch of these DACs in their project, Microchip direct sells these parts pre-programmed to different I2C addresses for about the same cost as they can be...
  22. You probably need to do something like ...

    You probably need to do something like

    #define PIN_D2 2
  23. As stated in #6 above I have modified the...

    As stated in #6 above I have modified the BuyDisplay code example given fro the Arduino DUE. My mod uses the SumoToy RA8875 driver contained in Teensyduino along with different pin assignments. I...
  24. Oh, there is one more thing, the data sheet for...

    Oh, there is one more thing, the data sheet for this (may still) shows conflicting information to the interfacing sheet.
    ...
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    Did you connect the ground on your device to the...

    Did you connect the ground on your device to the ground on the Teensy?
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    Where are you probing the ground at? Try...

    Where are you probing the ground at?

    Try using the upper left pin, on the Teensy, above pin-0 or the pin directly across between pins A22 and D13.

    Don't use the analog ground pin as a...
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    I am finding that I have not fried my display...

    I am finding that I have not fried my display and/or touch screen and am getting closer to resolving my problem(s). Refer to this post for more detail.
    ...
  28. @Keith I too have been having problems with...

    @Keith I too have been having problems with this display, ER-TFTM050A2-3 from BuyDisplay.com.

    I find that in the Wolfman (based on Skallwar) release that the Reset and clear reg routines...
  29. Beware though. I'm not out to bash BuyDisplay,...

    Beware though. I'm not out to bash BuyDisplay, I've used many of their displays in my projects. Mostly the 3-inch ILI9341 display with xpt-2046 resistive touch and the 4.3-inch display with...
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    ISTR you are using a T3.5 or T3.6. On those ...

    ISTR you are using a T3.5 or T3.6. On those SCK0 is on pin 27 (probably what you meant). I bet Paul used pin #13 as an extension of T3.0 thru T3.2 pins which he tried to make...
  31. @UhClem did you mean to say MAX31855 has no data...

    @UhClem did you mean to say MAX31855 has no data out pin?

    On SPI only those devices that have output pins that don't properly tri-state would require the 74hc125 (or similar) buffer.

    @Bastiaan ...
  32. Teensy 3.2 shows the MOSI as data out and MISO as...

    Teensy 3.2 shows the MOSI as data out and MISO as datain, refer to the Teensy 3.5 card for updated names. Kind of confusing. Do you use other SPI devices on the same bus as they could have...
  33. Look at the respective data sheet for your...

    Look at the respective data sheet for your device. There is a PinConfigurationRegister (PCRx) for each pin. In that register are bits to set the pin as either Im or Out with additional controls to...
  34. If the T4.x series is anything like the T3.x...

    If the T4.x series is anything like the T3.x series, then those pins marked 3.3v are common (the same). They supply up to 250mA total current (I1 + I2). Check the schematic on the website. ...
  35. Although I have not graduated to using the Teensy...

    Although I have not graduated to using the Teensy 4.0 or 4.1 just yet, I have made a battery powered project using a Teensy 3.2 with an ILI9341 display. For that I use an Adafruit Power Boost 1000...
  36. Digging into this some more, I find that in file...

    Digging into this some more, I find that in file <spi_drv.cpp> it defines all the SPI related pins (11, 12, 13) plus some default pins (7, 9, and 10) and assigns them starting state levels. Of...
  37. This morning I tried setting the PCR lock bit for...

    This morning I tried setting the PCR lock bit for D13. The state of D13 did not change after Ethernet.begin() occurred. This shows something is trying to change the pin state. Of course I...
  38. Ooops, My bad. Yes it is a Teensy 3.2 that I'm...

    Ooops, My bad. Yes it is a Teensy 3.2 that I'm using.
  39. Ethernet.begin() upsets state of Pin D13

    I'm making a battery powered project and am using pin D13 to turn it off via the touch screen. I find the when using Ethernet.begin, it interferes with the state of pin D13, causing it to go low. ...
  40. Maybe you can develop code to self load a Teensy....

    Maybe you can develop code to self load a Teensy. You could be a hero in this forum for doing so. I just don't have the time or need to do it. You should investigate the links in the other...
  41. If your 'new version' is Aruino code *.ino then...

    If your 'new version' is Aruino code *.ino then it must be assembled/compiled & loaded by the environment.

    If your code is a hex file then the Teensy loader can handle it. Currently there is...
  42. Use your short pulses to gate a constant current...

    Use your short pulses to gate a constant current into a capacitor of known value then measure the value of the resulting voltage.

    See: ...
  43. Not much info given here. You must load your...

    Not much info given here. You must load your sketch into the Arduino environment (with Teensy 3.6 support selected) Compile it and load it onto the target device to your Teensy 3.6

    I see you...
  44. Sounds like an SPI bus contention issue. Does...

    Sounds like an SPI bus contention issue. Does your SD Card adaptor use Tri-State buffers on the SCLK, MISO & MOSI lines controlled by CS? ISTR some SD Cards play nice while others don't on shared...
  45. Did you use the Teensy board for another project...

    Did you use the Teensy board for another project where you had cut the USB power to Vin trace?
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    Check out yard sales and flea markets. Get a...

    Check out yard sales and flea markets. Get a bunch of cigar boxes to keep your stuff in. Stack them and put category labels on the box ends.
  47. Is this a valid method to time code execution?

    I'm trying to make an I2C decoder that uses the PORTx_PCRn register to create DMA / IRQ requests as was described in this POST.

    I'm using a TEENSY 3.2 running at 96MHz and would like to be sure...
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    Found it on the waayback machine...

    Found it on the waayback machine here.https://web.archive.org/web/20180713004819/https://mb-raw.blogspot.com/2018/02/teensy-32-capacitive-touch.html
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    GSL1680 touch screen problems

    I recently purchased a TFTM050A2 display form Buydisplay.com and am having problems getting the touch screen working. Just to be clear though the display part is functioning thanks to the examples...
  50. @Jim Lee You're quite correct. I sometimes...

    @Jim Lee You're quite correct. I sometimes find others ideas lacking thorough documentation explaining their idea. I too wrote my own using the AdaFruit touch paint example and creating more...
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