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OLEDs / Re: NHD-1.5-128128UGC3 + Beaglebone Black
« Last post by jamesbr3 on Today at 04:39:13 AM »
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Graphic LCDs / Can't get NHD-12232KZ to work with STM32
« Last post by pcbguy1 on November 18, 2017, 01:05:00 PM »

I purchased one of these displays for a project that I'm working on and it's proving to be difficult to get it to work nicely with an STM32. I'm using SPI to send the data to an 8-bit shift register whose outputs are routed to the LCD's data pins. I looked at the data sheet and confirmed the timing for a 3.3V system, and tried translating the example code given to the STM32, but to no avail. I tried the code in 6800 mode and in 8080 mode, and both produce no results.

I've confirmed that the hardware lines are functioning correctly and are routed to the correct positions, the shift register outputs the correct data, and the SPI transmission is correct. When the reset button is pressed, the LCD displays a single straight horizontal line, but when I let go of the reset button the line disappears. I double checked all grounds and they're fine.
Are there any details that I may have missed when initializing the LCD?
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TFTs / Re: working with nhd-7.0-800480ef-asxv-t with buildroot framebuffer
« Last post by mnylund05 on November 17, 2017, 08:40:34 AM »
I am not getting any display activity, just blank screen.  I have configured panel-simple to all know parameters for this display and still nothing
Character LCDs / NHD-0420D3Z-FL-GBW-V3 backlight flicker
« Last post by ThomyLanty on November 17, 2017, 04:39:52 AM »
I'm using a NHD-0420D3Z-FL-GBW-V3 in SPI mode at 64kHz. All functions are working, but the backlight is flickering randomly.

I figured out that the PIC16 microcontroller that sits on the display PCB is dimming the backlight by PWM. I measured this PWM pin and I saw that it is skipping a cycle once in a while, which causes the flickering.
Then I measured the SPI lines simultaneously and I saw that the missing PWM cycle always occurs short after the end of a SPI write cycle, short after the CS pin getting high.
See the attached screenshots of the timing (Ch 4 is the SPI MOSI instead of CH3).

As far as I can tell I met all timing constraints. It looks like the PIC 16 controller can't keep up and first handles the SPI transfer and then misses the timing of the PWM. SPI will probably have a higher priority then PWM.

Does anyone have an idea to fix this issue?
TFTs / Re: working with nhd-7.0-800480ef-asxv-t with buildroot framebuffer
« Last post by Saurabh_B on November 16, 2017, 08:15:38 AM »
Can you give us more information as to what issues you are having?
TFTs / working with nhd-7.0-800480ef-asxv-t with buildroot framebuffer
« Last post by mnylund05 on November 15, 2017, 11:23:36 AM »
I am having big trouble configuring the system via panel-simple and device tree.

Please help

mark nylund
OLEDs / Re: OLED Multi-Font IC Problems
« Last post by Kon-L on November 10, 2017, 11:10:08 PM »
Here is Part 2!  See previous post for part 1.
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