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  1. Best to have a 100nF close to pin 20 of the...

    Best to have a 100nF close to pin 20 of the shifter.
  2. First you need to change your display driver...

    First you need to change your display driver from:

    #include <Adafruit_SSD1306.h>

    to

    #include <RA8875.h>

    Then setup the SPI pins to your board. Might be worth trying out some RA8875...
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    My tools for SMD work: Fine tip soldering iron...

    My tools for SMD work:

    Fine tip soldering iron
    x7 magnifier, use for inspection
    0.3mm lead free solder
    Tweezers

    20490
  4. Hi MichaelMeissner, Is there any simple sketch...

    Hi MichaelMeissner,

    Is there any simple sketch to test the psram and flash after they been soldered?

    I've seen the long thread about T4.1 but would nice to have a simple sketch to see they are...
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    Sparkfun have them in stock now. No restriction...

    Sparkfun have them in stock now. No restriction on how many you can buy. When the Teensy 4.0 was release it was only 2 per customer.

    Just ordered some.
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    Got an email from Sparkfun. Teensy 4.1 should be...

    Got an email from Sparkfun. Teensy 4.1 should be available from today !!

    https://www.sparkfun.com/products/16771

    Oh its pre-order.
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    Nice project. I like the combination of...

    Nice project.

    I like the combination of electronics and wood.
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    The SPI is quite slow. The driver won't go above...

    The SPI is quite slow. The driver won't go above 22MHz.

    Check in the file RA8875UserSettings.h about line 190

    const static uint32_t MAXSPISPEED = 22000000UL;

    I'm sure the RA8875 can go...
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    Code is on Github: ...

    Code is on Github:

    https://github.com/skpang/Teensy40_LittlevGL_ILI9488_demo_create

    Ensure the following library are installed first:
    https://github.com/littlevgl/lv_arduino...
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    I've got it working with the Teensy 4.0 and a...

    I've got it working with the Teensy 4.0 and a 3.5" LCD with ILI9488_t3 driver. Managed to get the SPI running at 60MHz. Its fast.

    19973
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    The Button and Label test code are at: ...

    The Button and Label test code are at:

    https://github.com/skpang/Teensy40_LittlevGL_RA8875_button

    Ensure you have installed these library first:
    https://github.com/mjs513/RA8875/tree/RA8875_t4...
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    Agree, I had the SPI working at 60MHz connected...

    Agree, I had the SPI working at 60MHz connected to an ILI9488 LCD. Its really fast and I'm surprised it works at 60MHz.

    The LCD is working at 60MHz. I'm thinking do I really need to drive it in 8...
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    Is there any 8 GPIO pins that is mapped directly...

    Is there any 8 GPIO pins that is mapped directly to memory so it can be written in one byte on the Teensy 4.1 ? That is if I want to control 8 GPIO at once by writing one byte to memory. There is a...
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    Thank you KurtE for the pinout spreadsheet. ...

    Thank you KurtE for the pinout spreadsheet.

    How comes there is MISO1 on D1 and another MISO1 on D39 ?
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    SOLVED !! I've changed it to use writeRect...

    SOLVED !!

    I've changed it to use writeRect instead:

    /* Display flushing */
    void my_disp_flush(lv_disp_drv_t *disp, const lv_area_t *area, lv_color_t *color_p)
    {

    uint16_t width =...
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    Ok, I've deleted the original RA8875 library and...

    Ok, I've deleted the original RA8875 library and install this one:

    https://github.com/mjs513/RA8875/tree/RA8875_t4

    but still the same problem. I think something is not right with drawPixels()...
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    LittlevGL with RA8875 on Teensy 4.0

    I'm trying to use the LittlevGL library with RA8875 LCD on Teensy 4.0. The LCD is a 800x480 and the RA8875 library is from sumotoy v0.70b11p11

    There is no LittlevGL port for the Teensy 4.0 so I've...
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    Hi @prickle I'm try to get LittleVGL to compile...

    Hi @prickle I'm try to get LittleVGL to compile for Teensy 4.0 and looking at your example in post #1.

    The LV_VDB_SIZE_IN_BYTES is not defined. I've made it to 307200. (480x320*16)/8 = 307200
    ...
  19. Boris is in intensive care now. Hope he pulls...

    Boris is in intensive care now. Hope he pulls through.
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    Is there somewhere I can download an example code...

    Is there somewhere I can download an example code for use with the Teensy 4 and ILI9341 ?
  21. I wonder if the postoffice will shut. If it does...

    I wonder if the postoffice will shut. If it does then I will have to shut my online store.

    Actually it wouldn't make that much difference, sales has been right down.
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    It is not very clear from the photo but have you...

    It is not very clear from the photo but have you actually soldered some header pins on to the Teensy then plug it onto the bread board?

    Looks like the RX1 and TX1 on the Teensy is not connected to...
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    Wow, that is smooth. Would it be possible for...

    Wow, that is smooth.

    Would it be possible for you to share the code ?
  24. @mjs513 Using frame buffer works. No flicker on...

    @mjs513 Using frame buffer works. No flicker on screen now.

    @KurtE Using opaque fonts also works.

    Now I have choice of which one to use. I will continue with my project.

    Thanks for...
  25. Anyway to stop flickering during update on ILI9341 display ?

    I'm using a 2.8" ILI9341 LCD on Teensy 4.0
    To update a counter I first fill a rectangle with the background colour to erase the old number the print the new number.
    There is alway a small annoying...
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    The Pyboard D-series uses an interesting concept....

    The Pyboard D-series uses an interesting concept. Big thru holes at 0.1" pitch then smaller holes between the 0.1" hole. Making the pitch 0.05".
    You can get 0.05" pin header and sockets from Mouser....
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    Using high density connectors like the one on the...

    Using high density connectors like the one on the Portenta H7 is going to make prototyping an add on board quite difficult. Not only the fine pitch but spacing between the two connector is quite...
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    Yes, a preview of the layout would be nice.

    Yes, a preview of the layout would be nice.
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    Don't think anyone has written a CANopen stack...

    Don't think anyone has written a CANopen stack for Teensy.

    The nearest CANopen I've found is for the mbed module. You might be able to port that to the Teensy....
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    Try this code:...

    Try this code:
    https://github.com/skpang/Teensy_CAN-Bus_ECU_reader




    https://www.youtube.com/watch?time_continue=1&v=hlEDgPzolJg&feature=emb_logo
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    Which one is best to use on Teensy 4.0 ?...

    Which one is best to use on Teensy 4.0 ? Circuitpython or Micropython ?
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    I can't see any screenshoots. Is there anyway...

    I can't see any screenshoots.

    Is there anyway to get a pre-build version ? I don't have Visual studio or Visual C++ installed. In fact, I'm using a Mac.
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    Looks interesting. Does the install run on a...

    Looks interesting. Does the install run on a PC,Mac or Linux ? What about when running the example ?
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    Try and set a higher sampling rate on your Saleae.

    Try and set a higher sampling rate on your Saleae.
  35. Wow ST7735_t3 works without changing anything. I...

    Wow ST7735_t3 works without changing anything. I see the SPI clock is at 24MHz and it works. Not sure why I used Adafruit's one in the first place.

    Many thanks.
  36. How to slow down SPI clock for Adafruit-ST7735 library ?

    I'm trying to use Adafruit 240x240 TFT LCD https://www.adafruit.com/product/3787

    With their library
    https://github.com/adafruit/Adafruit-ST7735-Library...
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    @tannewt is there any CAN and CAN FD support on...

    @tannewt is there any CAN and CAN FD support on CircuitPython ?
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    Works fine on MacOS Catalina with Teensy 3.2,...

    Works fine on MacOS Catalina with Teensy 3.2, 3.6, 4.0
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    Could be a power up problem. How are you powering...

    Could be a power up problem. How are you powering the T3.2 and the CAN transceiver ?

    Post the schematic and some photos of the setup.
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    Teensy 4.0 vs PORTENTA H7

    Arduino has just announced the PORTENTA H7

    https://store.arduino.cc/portenta-h7

    Not quite a fair comparison to the Teensy 4.0 but it has some pretty impressive features.

    Interesting it has...
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    Just tried Sumotoy's font conversion tutorial. It...

    Just tried Sumotoy's font conversion tutorial. It works !!!

    Initially the converter software only listed the Arial font. I didn't really want to use that font because I believe it is copy righted....
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    Any decent fonts for RA8875 display ?

    I'm using Sumotoy's RA8875 driver on a Teensy 4.0

    The display and driver works but I found the font is a bit strange.

    The aerial_22 and aerial_48 font doesn't look like Arial font and aerial_48...
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    From what I can see on the photo the wiring still...

    From what I can see on the photo the wiring still doesn't look right. On the 5v rail on the breadboard there is a cap connected to it but it does not look like it is connected to the transceiver....
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    Don't think you have wired the transceiver up...

    Don't think you have wired the transceiver up correctly. There is a separate supply for Vio (pin 5), you need to connect to this the 3.3v supply but it looks like you have connected to the 5v supply....
  45. Thread: CanBUS joystick

    by skpang
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    How much does the joystick cost ? They look...

    How much does the joystick cost ? They look expensive.
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    You don't need a voltage divider on the CAN_TX...

    You don't need a voltage divider on the CAN_TX line because the signal is coming from the Teensy. What resistor value did you used ? Post a photo of the setup.
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    How did you check the pins on the Teensy 3.6 are...

    How did you check the pins on the Teensy 3.6 are still ok ? The CANH and CANL doesn't connect to the T3.6.

    You can try and add a voltage divider from CAN_RX (CRX pin) to the T3.6 but damage might...
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    The Teensy 3.6 is not 5v input tolerant. The way...

    The Teensy 3.6 is not 5v input tolerant. The way you have connected the MCP2551 to the 5v supply and the logic out to the T3.6 is 5v. You might have damaged the T3.6.

    You also need a 120R...
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    I'm not talking about whether the pixel are...

    I'm not talking about whether the pixel are square or round. I've used some large LCD, when I draw a circle, its not 100% round. It's an oval shape.
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    I see the 10.1" display has a dot pitch of...

    I see the 10.1" display has a dot pitch of 0.2175(W)x0.2088(H)mm. Do you have any problem drawing a circle ? Does it look round ?

    I had loads of problems with non square pixels trying to draw...
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