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TouchGFX 4.27 Tackles Embedded Graphics Through Memory Strategy
Stephen A. Vicinanza | Embedded Science
A more capable embedded display does not always require a larger processor. STMicroelectronics’ TouchGFX 4.27 update shows why the way an application uses memory can be just as important to the interface a user sees.
- Hybrid buffering combines internal working space with external framebuffers.
- Delta-compressed animation targets storage used by changing visual content.
- Reported improvements depend on the workload and configuration being tested.
What ST changed
ST’s October 14 article introduces hybrid double buffering and delta-compressed animation. The company reports rendering improvements in selected tests, including an example moving from 25 to 15 milliseconds, and animation-storage reductions of up to 90 percent in suitable cases. These are conditional vendor results, not a promise that every application will double its frame rate or achieve the largest stated saving.
Begin with the visible problem
A product team should identify the behavior it wants to improve before choosing an optimization. A sluggish transition, a delayed value update and an animation that occupies too much storage are different problems, even when users describe all of them as a slow interface.
An illustrative test could record a specific interaction and measure its behavior on the intended hardware. The team would then have a repeatable case against which to compare the new strategy. Without that baseline, a visually impressive demonstration might not establish that the actual problem has improved.
The test should include the other work the product must perform. A display application in isolation may not represent the experience of a system also handling its ordinary inputs, communications and control functions.
Memory strategy is a design choice
ST describes rendering changed regions into an internal partial buffer before transferring them to the external framebuffer arrangement. The practical question for a team is whether that strategy suits its own display, assets and available memory.
A review should document the resources committed to the graphics path and the behavior it expects under demanding updates. That makes it possible to judge the approach as an architectural choice rather than an automatic upgrade.
The same discipline applies to animation compression. Developers should evaluate the actual assets used by the product and retain the visual quality and behavior required by the interface. A maximum saving reported for selected content is a reason to test, not a capacity estimate for an unrelated asset set.
Read performance percentages with their conditions
The ST article refers to improvements of up to 40 percent in one explanation and up to 50 percent in some internal tests. Those statements need not describe identical measurements. Reporting should preserve the associated examples rather than collapse them into a universal claim.
For an internal comparison, the team should record the software version, hardware, display configuration and test content. It should also state which resource or timing measurement changed. That record is useful when a later update changes the workload again.
The product lesson
TouchGFX 4.27 offers a concrete reason to inspect the memory behavior behind an embedded interface before replacing the computing platform. The right outcome is an application that meets its visual and functional requirements with a documented resource budget. Better-looking graphics are valuable when the engineering evidence shows how the complete product supports them.
Create a workload that represents the product
A graphics benchmark should reflect the interactions the finished equipment must support. The team can select a repeatable sequence that includes the visual transitions and data updates most relevant to users. Keeping that sequence with the results gives future developers a way to judge whether an optimization remains applicable.
If a new release changes the assets or display configuration, the team should identify which earlier conclusions need to be checked again. That prevents a favorable result from becoming a permanent assurance detached from the application that produced it.
Include the application beyond the screen
An embedded interface is part of a product, so the evaluation should preserve the other functions the product is expected to perform. The review should state whether those functions were active during a graphics test. A smooth isolated demonstration and a satisfactory complete application are different outcomes.
A team can also define what happens when the display cannot complete an update as expected. The appropriate response depends on the product requirements. The important point is that visual performance should be evaluated alongside the application’s functional responsibilities rather than allowed to replace them.
Keep conditional results conditional
When publishing an internal comparison, engineers should describe the actual starting point and the change made. A percentage improvement becomes more useful when readers can see the measured values and the test conditions behind it. The largest result from one example should not become the assumed saving for every screen in a product family.
This discipline makes vendor updates easier to assess fairly. The team can recognize a valuable optimization without having to accept the broadest reading of a headline. TouchGFX 4.27 is interesting because it offers specific strategies that can be examined in a real application. The next step is to determine which of those strategies addresses the product’s own bottleneck and to preserve the evidence supporting that decision for the next software revision.
Retain the baseline for the next release
A team adopting an optimization should keep the original test case and the measurements used to accept it. That makes later changes easier to evaluate and gives developers a way to distinguish a regression from a different workload. It also preserves the reason for the architectural choice. The most useful outcome is a documented improvement in the intended product, with the evidence available when another developer needs to maintain the application or investigate an unexpected display behavior.
That record can also support a clearer conversation with product teams, showing which visible improvement was demonstrated and which resource decisions made it possible. The evidence then remains available when the interface or hardware changes.
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