Does not work with Teensy 4.0 on SPI 0

[DIYLAB-DE]

Hi, unfortunately the example "99 balloons" does not work with Teensy 4.0 and an ILI9341 3,2" display at SPI 0. The screen stays dark (backlight LED is configured correctly).

Did you try your driver only on Teensy 4.1?

Best regards 99luftballons.zip

[vindar]

Hi,

I just tried the library with a Teensy 4.0 and it is working fine for me. There are a couple of problems with the sketch you attached to your message:

• PIN_MISO cannot be set to 255. Because the driver syncs with the screen, it must be able to communicate with the screen both ways hence it needs both MISO and MOSI connected. When using Teensy 4.0, this means using pin 12 for MISO and pin 11 for MOSI.
• PIN_RESET must also be connected to any pin you want (I choose pin 6 in the example below).
• PIN_DC must be a valid CS pin for the SPI port: I know this is strange but it is really the screen DC pin (and not the screen CS pin) which must be connected to pin 10 (the CS pin on the Teensy 4.0).
• PIN_CS can be any other pin on the Teensy (I choose pin 9 in the example below).

Here is the .ino sketch and a photo of the connections which works for me.

99luftballons.zip

[DIYLAB-DE]

Hi,

thanks for the explanations, now it is clear to me.

Ok, then I can not use this driver, too bad.

In my case MISO is not connected and Reset is on VCC:

https://www.diylab.de/forum/thread/31-huckepack-platine-im-entstehen/?postID=162#post162

Kind regards

Bruno

[vindar]

Hi,

Yes indeed, if MISO is not connected then there is not way to use this library but ILIT9341_t3 or ILI9341_t3n should work nicely.

nice project btw.

Best,