I had tried spi clock from 40 MHz fown to 20 MHz then finally down to 6 MHz .. and the screen is the same ..I pulled it apart tonight , but the screen is very dim.. I'll put it back together and get a screen shot .
Thankyou for the reply .. I'm struggling with the Ra8876 display which is 7.84" 1280 X 400 pixels and requires SPI for 2 chips on the board SSD2828 is the bridge chip from SDI to MIPI and needs to be set to allow the...
I know there is an issue with Tri-stating on the SPI buss with RA8875 displays ..
the question I have is if you have 2 devices on the SPI buss that have their own CS lines ...
Is the tri-state problem still there ?...
I am still struggling getting this display to work .. I'm trying to integrate it with the teensy 4.1 ..
I have tried the fork for the 7.84" display under wwatson4506 (RA8876liteTeensy) .. I can get the backlight to...
I'm running on the t4.0 , the code appears to be running , display is trying to work , lines across the display , I'm currently using this pinout configuration with the T4.0
// Pin connection mapping
ER_TFT0784_t3...
Okay update .. I switched from the t4.1 to the t4.0 .. I re-did the configuration jumpers a second time ... I have torn graphics on the screen ..colored lines and they appear to be changing periodically so I suspect its...
blackketter .... I'm at the point I had best take your wiring trace ... I was hoping I would not have to ask you this but , Something is not right ..
Thanks
K
Well tried both displays .. Not pulling my hair out yet .. but no luck yet .. This should be running ...but I'm missing something and just have not figured it out yet... LOL
will keep trying .. power is good ,...
No happyness, Built the new supply .. voltage and current are good under load ... Ran an RA8875 off the supply with a teensy 4.1 to test .. all good .... no issues ..
reconnected the ra8876 display .. confirmed...
Hi Derek, thanks for updating your SDR library ..There are members on my Facebook Group (Keiths_SDR) that are using it for their receiver builds ..Im also running the 2.8" touch panel as well as the ili9488 3.5" touch...
Thanks for your reply .. Im building up a new supply for my project and will make sure I have sufficient current ...but I did drive it off a supply that could provide 1.5amps .....but I did check the power regulation...
Okay, glad you saw that first hand ...I could not identify where the message was coming from ..Still no change , can't write anything to display on the screen ....Hopefully someone will chime in.
well for grins and just to make sure I wasn't losing my marbles .. I pulled the Dupont connectors off the display and routed them to an RA8875 display on the bench .. loaded code and up it came ..Wanted to rule out a...
Look fine by me, but I have to admit this one is a challenge and it shouldn't be .. it's straight up wiring and pin configuration validation ..
So I must be missing something but I can't figure out what ......
Okay ..
validated the configuration for the second board all is good ...
validated connections from display to teensy ...everything is where it should be according to your pinout list
deleted my projects for the...
for the SPI 4 wire configuration all pins that should be shorted are fine ...
but there are pins that are suppose to be "open" which are shorted.
light touch with my iron and I'll test again
Good Idea .. I had not thought of that ...getting complacent.. I've got a number of other displays from them and they came without a hitch ... I have a second 7.84" I could try to rule out a bad display as well
No problem on the silence, I'm running it off my USB port on my HP workstation.I'll cut it over to my 5v supply... I've run my ra8875s ..4,3" 5" and 7" off usb with the t4.0/T4.1 so more then likely I'll need more...
Okay, The backlight is coming on for the ra8876 7.84" display. But still can't seem to get text or a screen fill with color ....
I'm running this on a t4.1
is pin 36 on the 7.84" display (2828DC) not required ... I've...
Blackketter .. Well gave the code a shot .. compiles and loads the demo .. but screen does not respond (Black no activity)... Validated my wiring and matched 1 for 1 for the t4.1 and what you have published ..Checked...
oh wow !!! thanks ... Last time I had looked, the 7.84 was not moving forward ..
I got the display a while back but am somewhere above a "beginner" and certainly below an "intermediate" programmer..
I appreciate...
A big thank-you to Greased Lightning ..Ive been struggling with the gsl1680 touch code , and he managed to get me up and running...Ive been on another project and only found today to give it a good go ! Again thankyou...
I have 2 of these buydisplay7.84 "candy bar" 1280 X 400 displays ..
They require SPI for the RA8876
and SPI for the ssd2828 chip .. which needs to initialize communications to the RA8876
(its sort of set it and...
Thankyou so much for the link ..I was running through threads back mid 2020 and couldn't get a grasp where things were ..Im cutting over to the t4.1 ..I understand I need 2 spi ports to get this up and running , so need...
ive been trying to read up on the status of this library and get caught up ..Im currently running an ra8875 4.3" 800x480 display and t4 and purchased the 7.84" ra8876 1280 x 400 display last September to upgrade... but...
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