Noticed that the library hogs memory when using the BMP-conversion feature. Each screen update added about 1-2% of memory usage until the application would crash.

I added these two lines just before the return in Show_bmp() in miniGUI.c (line 685), which seems to be a big improvement from my initial tests. I also added a call to the IT8951_Cancel() function from IT8951.c in my application, but this doesn't appear to have a big effect.

free(bmp_dst_buf);
free(bmp_src_buf);

Only tested on 9.7" display with RaspberryPi Zero.

Hi, can someone help with with this problem, I am a newbie so it might be something very simple.

When I run the example from waveshare like so, sudo ./IT8951 0 0 01.bmp I get the following data:

Panel(W,H) = (1872,1404)
Image Buffer Address == 119F00
FW Version = SWv_0.1.
LUT Version = M841_TFA5210
VCOM = -2.27V
IT8951_GUI_Example

I can then freely put other bitmaps, and test will execute and the images will display.

However, when I try to use the python example, nothing gets displayed. What is worse -- if I come back to the C code, and run the same command, I get blanks:

Panel(W,H) = (0,0)
Image Buffer Address == 0
FW Version = 
LUT Version =
VCOM = -0.00V
IT8951_GUI_Example

Since there is no test code for 10.3" display, I am using a randomly picked epd7in5b_V3 and modified the width and height. I see that the other displays using this hat are 6", 7.8", 9" but none of those are available with working code examples in this python folder.

There must be a pin that needs to be switched in order to get this going again, but I have no clue where to dig and what to try. I attempted to use the EPD Hardware reset function, but it didn't work

Any help is appreciated!

I have 7.8 Inch Display, i interfaced the display with STM32 using SPI. I convert BMP image to C Array and then the C array add into my code then after i compile program then Flash Memory Overflow issue. Can you please help me ?

I need 4-5 different image in display

Hello,
I am working with Raspberry Pi 3 and the 10.3" Epaper Display from Waveshare. The refresh rate is very fast but the time to write the data from host frame buffer to IT8951 Frame Buffer is about 10 seconds. This is way to long for my application. Is there any way to make this process faster? Or can write multible images to different Frame Buffers on the IT8951? Has this to do with SPI interface?

After a quick profile to see why I'm not achieving a 450ms full refresh (7.5s instead) with the example code for a Raspberry Pi, it appears that most of the wall clock time is being spent loading the image from the host to the IT8951 driver (IT8951HostAreaPackedPixelWrite()). Is there a way to accelerate this?

Hi, I am working with IT8951 via USB, full screen update is working,
but when I try partial update, control board freeze. I see, that in source you are using
registers like 0x18001138. Where can I found description all of registers? Thanks!

Is there a way to partially refresh the screen instead of a full refresh?

I am asking this because I want to add lines smoothly as quickly as possible, but the refresh speed is too slow and I thought that is because it has to refresh the whole screen now.

Have someone used IT8951 on Orangepi?
I'm trying to use the ITI951 library, but it needs the bcm2835 library that is for Raspberry pi.

in constants.py there is this

TODO: make sure CW/CCW are correct

class Rotate:
NONE = 0
CW = 1
CCW = 3
FLIP = 2 # 180 degree rotation
How do we use it?

I have been picking out the useful functions in this library, fixing them, and modifying them for my project. I would like to know if I have permission to share them.

There currently does not seem to be a license. Could you please add a license of some sort?

If you want suggestions, I would highly suggest an public domain license such as CC0 or the Unlicense. The MIT license is popular.

Do you have also linux version of USB interface? I have module without access to SPI, but I can use USB (Tested from Windows application), but I need such SW/Example for linux.

Thanks

Hi and thanks for your code, it's really helpfull to start and build a new software to render images on the 7.8" e-ink screen!

I'd like to know if you can provide code to partially refresh the screen (only write a small image at a specific location)

Thanks for your help