I will try to describe the pin and connector system used in the picture, I have used this system for over 20 years in my designs in Practical Technologies lab. Inc. in which Iwas a contract engineer. I have found this system to be extremely reliable over a very long product lifetime. It is rather expensive but the high reliability is worth it.
I hope the pictures with the descriptions are self explanatory,
Ray McDonald AD0JK
2.8 TFT display not working in SPI mode, works in 8 bit mod
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Please be positive and constructive with your questions and comments.
- RSMcDonald
- Posts: 16
- Joined: Sat Mar 06, 2021 6:17 pm
Re: 2.8 TFT display not working in SPI mode, works in 8 bit
- Attachments
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- break away header pins
- PA317938a.JPG (257.24 KiB) Viewed 293 times
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- wire with crimped connector pin
- PA317939a.JPG (141.64 KiB) Viewed 293 times
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- breadboard wiring assembly
- PA317940a.JPG (153.99 KiB) Viewed 293 times
- RSMcDonald
- Posts: 16
- Joined: Sat Mar 06, 2021 6:17 pm
Re: 2.8 TFT display not working in SPI mode, works in 8 bit
I will try to describe the connector system used on the breadboard. I have used this system for over 20 years at Practical Technologies Lab. Inc. and it has been found to be highly reliable connector system.
I will label the pictures.
Ray McDonald AD0JK
I will label the pictures.
Ray McDonald AD0JK
- Attachments
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- connector for the pin
- PA317937a.JPG (289.7 KiB) Viewed 293 times
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- pins for the crimper
- PA317936b.JPG (242.83 KiB) Viewed 293 times
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- the crimper with the pins and the pin socket as well as a wire with a crimped pin and the breakaway headers
- PA317935a.JPG (160.35 KiB) Viewed 293 times
- RSMcDonald
- Posts: 16
- Joined: Sat Mar 06, 2021 6:17 pm
Re: 2.8 TFT display not working in SPI mode, works in 8 bit
Ray McDonald
- RSMcDonald
- Posts: 16
- Joined: Sat Mar 06, 2021 6:17 pm
Re: 2.8 TFT display not working in SPI mode, works in 8 bit
The display is very intermittent. It will work for about 30 seconds once in twenty to fifty resets by either hitting and holding the UNO reset button or unplugging the UNO and then plugging it back into the USB port.
- adafruit_support_carter
- Posts: 29473
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Re: 2.8 TFT display not working in SPI mode, works in 8 bit
For the sake of troubleshooting, can you make the connections more directly from the UNO to the TFT? i.e. without the custom connector system.
- RSMcDonald
- Posts: 16
- Joined: Sat Mar 06, 2021 6:17 pm
Re: 2.8 TFT display not working in SPI mode, works in 8 bit
The display will come on and work onec in about twenty to fifty UNO resets or power cycles. When it works it only stays working for about 30 seconds to a couple of minutes before it turn back to a totally white screen. Without touching anything but the UNO reset button, I can get it to work in the twenty to fifty resets. This is definitely an internal transient condition in my opinion.
I have answered the above question about the UNO wiring three times but do not see that here now. What happened???
Ray McDonald
I have answered the above question about the UNO wiring three times but do not see that here now. What happened???
Ray McDonald
- RSMcDonald
- Posts: 16
- Joined: Sat Mar 06, 2021 6:17 pm
Re: 2.8 TFT display not working in SPI mode, works in 8 bit
Yes, as a last attempt, I will use direct wiring to the display with solid 20 gauge wire being plugged into the UNO.
Ray McDonald
Ray McDonald
- RSMcDonald
- Posts: 16
- Joined: Sat Mar 06, 2021 6:17 pm
Re: 2.8 TFT display not working in SPI mode, works in 8 bit
The display is now working fine. It just passed a 24 hour power-on test. It turns out that a connector on the UNO was giving the intermittent problem. Some times the smallest problems are the hardest to find. Thank you for all of your help. It is appreciated.
Ray McDonald AD0JK
Ray McDonald AD0JK
Please be positive and constructive with your questions and comments.