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Type: Posts; User: jerrymonkey

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  1. And the bloody coronavirus cause Taobao to ban...

    And the bloody coronavirus cause Taobao to ban shipping my cheap displays, so I maybe can wait until Teensy 4.1 comes out.
    I can make my violin while I wait. Maybe make it more Teensy-y
  2. RRR... If I use parallel, I may use the CS pin to...

    RRR... If I use parallel, I may use the CS pin to make them share the same data pins right, and DMA feels like a big hassle for dual displays.
    And do I HAVE to change pixels to something in a...
  3. May I use 2 displays with DMA? Is it possible? Is...

    May I use 2 displays with DMA? Is it possible? Is the memory enough?
    The display both are ILI9488 with SPI, with CS pin, and both 320*480. How to do it?
  4. Oh I am a dumbass, USB is 3.3V logic levels! USB...

    Oh I am a dumbass, USB is 3.3V logic levels! USB 2.0 is 0.4V!
    So no worries right there, to connected it directly to the pads for sure. Just maybe add an ESD protection.

    For the power USB port I...
  5. That is very clear, so the USB interfaces, both...

    That is very clear, so the USB interfaces, both the programming port and host port are not like normal digital pins. They are also designed to directly connect to a USB port, so 5v levels then....
  6. Hey KurtE, can you give me some guidance for this...

    Hey KurtE, can you give me some guidance for this problem I have @ https://forum.pjrc.com/threads/59572-Level-shifter-needed-for-USB-input-host-port
  7. Level shifter needed for USB input/host port?

    So I need to reroute the USB input port (the original Micro USB port on board) to another USB female connector. Will I need to desolder the Micro USB port and use the pads or if I can just use pin D0...
  8. Do you happen to know how to put Teensy 4.0 into...

    Do you happen to know how to put Teensy 4.0 into very very deep sleep and can be woken up with a button?
    How is the power consumption?
    Or maybe I am limited to use the power on/off switch pin...
  9. Yeah, I totally agree, and the two frame thing is...

    Yeah, I totally agree, and the two frame thing is kinda unnecessary, tear free is not an important thing as well. As I am not totally understanding DMA, I'd better stick with the stock ILI9488...
  10. Could you explain a bit more how to use two frame...

    Could you explain a bit more how to use two frame buffer thingies? So my display is definitely 320*480, but what I can give up is bpp, if there is an 8 bit color option, that will work right?
    What...
  11. OK. Get it. Short, shielded wires. Just like PCI...

    OK. Get it. Short, shielded wires. Just like PCI Express.
    SPI, sounds really great. Also, the keypad button matrix also requires a fair amount of GPIO, so less pin is better. (Should I use a I2C I/O...
  12. If doing full updates/big updates, calling the...

    If doing full updates/big updates, calling the function will take less time for SPI as no waiting/digitalWrites stuff is needed, and just fast(RAM2 speeds) buffer writes, right?
    So if the display...
  13. Thanks!! Can't wait for the T4.1!

    Thanks!! Can't wait for the T4.1!
  14. And just to confirm, no quad SPI other than the...

    And just to confirm, no quad SPI other than the sdio right?
  15. Yeah, I saw it earlier this day, the fastrun code...

    Yeah, I saw it earlier this day, the fastrun code is a bit confusing, and Paul says the function to use it is on his Todo?

    Also is there a good way to run program on teensy written on teensy or...
  16. Yeah, keep throwing things to the buff and let it...

    Yeah, keep throwing things to the buff and let it send is great. Just worry about tearing effects for spi, and wipe animation when updating big chunks. Using lcd driver commands don't feel quite...
  17. No graph for T4 found, only one in 2016 But...

    No graph for T4 found, only one in 2016
    But someone real nice posted his results
    16mhz/36ma
    24mhz/36ma
    48mhz/41ma
    72mhz/44ma
    96mhz/53ma
    120mhz/53ma
    200mhz/54ma
    300mhz/63ma
  18. 19002 19003 19004 And these are what I came up...

    19002
    19003
    19004
    And these are what I came up with, but they happen to be much wider than what I wish so, coming at roughly 9-10 cm.
  19. The cheapy Chinese USB boost circuits' efficiency...

    The cheapy Chinese USB boost circuits' efficiency is worrying, costing about 40 cents, but garantee to turn on and stay on but no way to shut it down.
    The damn power bank circuit that comes with the...
  20. Another non-related question, how to give power...

    Another non-related question, how to give power to teensy with a button and shut off with a GPIO, I know a latch or something or auto power off circuit is ok, but um...
    I will use a 3.3v 500mA power...
  21. Now I kinda want a dual 3.5 inch 480*320 lcd...

    Now I kinda want a dual 3.5 inch 480*320 lcd setup, so that I don't need to 3d print and polish that many buttons (making those custom rubbery buttons with plastic caps prototypes is real pain in the...
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    That is goooood!

    That is goooood!
  23. That is a great DMA explanation! So I guess in...

    That is a great DMA explanation! So I guess in the ILI9488_t3 library, the SPI transfer part doesn't use SPI.transfer that sort of stuff but instead just set some registry or variable to the data,...
  24. Ooof!!! FlexIO is a tad difficult than just port...

    Ooof!!! FlexIO is a tad difficult than just port manip. Also how to do port manipulation correctly, all I get from the core library in core pins is the registry to turn what pin high and other...
  25. Wow.. That is a lot of interesting and useful...

    Wow.. That is a lot of interesting and useful information! So what will I lose if I don't have DMA, because I don't quite understand how that thing works. I am planning on creating a simple function...
  26. So yeah thanks for your help I now know 3A...

    So yeah thanks for your help I now know 3A command can set the color mode thing.
    Since WR need to be pulled for a few nanoseconds, which for teensy, is actually a few clock cycles that need to...
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    Oh my god you just bought an TFT display without...

    Oh my god you just bought an TFT display without knowing the IC...
    That is like trying to connect a smartphone screen to Teensy
    There is no way you can drive MIPI DSI or DPI with Teensy

    Well, it...
  28. I originally thought SPI was a pretty FAST thing,...

    I originally thought SPI was a pretty FAST thing, now I know that parallel still does better, especially dealing with Teensies.

    18961
    If I understand it correctly, you will have to first set...
  29. TFT Display: SPI or 8 bit parallel interface?

    So the ILI9488 and most other TFT libraries writen or ported to Teensy is using SPI interface, but I found a ILI9488 320*480 TFT display with a nice capacitive touch....
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    Is this how you do port manipulation?

    https://i.imgur.com/yNSnayA.jpg
    So this is what I came up with, and I don't know if it works or not.
    I haven't got my Teensy 4.0 yet, I am waiting for T4.1, which seems to have more GPIOs but still...
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