About ebray

ebray · 2022-03-09

The latest versions of the STM32CubeL4 drivers (1.17.1) and CubeMX (6.5.0) introduce two bugs related to the OSPI and Delay Block Bypass.In stm32l4xx_hal_ospi.c line 383, the MODIFY_REG macro no long clears the DLYBYP bit. It also fails to set it acc...

ebray · 2021-01-13

I'm wondering if there is a way to force TouchGFX to draw an entire screen again. My project uses a DSI display with internal GRAM. To save power, I turn off the display when possible and turn it on only when needed. This of course erases the GRAM so...

ebray · 2020-11-23

I'm using partial frame buffers with CubeIDE 1.5.0 and TouchGFX 4.15. I've found that when updating large portions of the screen, the function touchgfxDisplayDriverTransmitBlock is never called with a height larger than 20 lines, regardless of the fr...

ebray · 2020-11-04

I have a custom board with an STM32L4R9 connected to a display (320x480) with internal GRAM over DSI. I've been successful in configuring and controlling the display using the HAL DSI API. Now I would like to use the LTDC to feed the DSI controller ...

ebray · 2020-05-27

I'm using STM32CubeIDE 1.3.1 with TouchGFX Generator 4.13.0 to create a project using Partial Frame Buffers. I've found a few issues that appear to be related to the code generation template for TouchGFXGeneratedHAL.cpp:The variable blockAllocator is...

ebray · 2021-01-13

I've found that if I call view.getRootContainer().invalidate() in my presenters then I'm able to get the screen to redraw.It would still be nice not to have to implement this for each presenter so I'm open to ideas for that as it seems like there sho...

ebray · 2020-11-07

The only significant differences I see are the changes introduced by setting VSYNC and HSYNC to 1.hltdc.Init.HorizontalSync = 1; hltdc.Init.VerticalSync = 1; hltdc.Init.AccumulatedHBP = 2; hltdc.Init.AccumulatedVBP = 2; hltdc.Init.AccumulatedActi...

ebray · 2020-11-05

I did compare with the DSI example project and it appears that the code generated by CubeMX for the LTDC configuration is consistent as the example shows 0 for the HSYNC and VSYNC values.

ebray · 2020-11-04

According to the ST documentation (DSIHOST presentation and AN4860) using LTDC with DSI in Adapted Command Mode is the most efficient way to control a display with internal GRAM. That's exactly what I'm trying to do. I believe HSYNC and VSYNC are sol...

ebray · 2020-11-04

Sure. That's handled in this CubeMX generated function.void MX_LTDC_Init(void) { LTDC_LayerCfgTypeDef pLayerCfg = {0}; LTDC_LayerCfgTypeDef pLayerCfg1 = {0}; hltdc.Instance = LTDC; hltdc.Init.HSPolarity = LTDC_HSPOLARITY_AL; hltdc.Init.VS...

User statistics

User Activity

STM32CubeL4 v1.17.1 OSPI Delay Block Bypass Problem

TouchGFX - invalidate/redraw entire view/screen

Partial Frame Buffer (4.15) maximum transmitted lines

Use LTDC with DSI on STM32L4R9

Issues using TouchGFX Generator with Partial Frame Buffers

Re: TouchGFX - invalidate/redraw entire view/screen

Re: Use LTDC with DSI on STM32L4R9

Re: Use LTDC with DSI on STM32L4R9

Re: Use LTDC with DSI on STM32L4R9

Re: Use LTDC with DSI on STM32L4R9