STM32H7RS-Benefit of NeoChrom Demonstration

The example will guide you through creating a graphical user interface on STM32H7S78-DK which demonstrate the benefit of NeoChrom GPU. We will use TouchGFX designer tool to create this interface which is composed of two icon that continously rotating and a button which allows to activate/deactivate NeoChrom IP.

Prerequisites

• TouchGFX Designer 4.24.0
• STM32H7S78-DK board
• USB type C cable

TouchGFX Designer 4.24.0

3 main steps will be needed :

1. Create a project and add the widgets (background image, two texture mapper and a toggle button)
2. Add interactions to made the texture mapper rotate and to activate/deactivate NeoChrom
3. Compile / download and test the generated project

1. Create a project and add the widgets (background image, two texture mapper and a toggle button)

• Run TouchGFX Designer 4.24.0

1.1. Create New project targetting the STM32H7S78-DK board

1.2. Add an image

1.3. Select a image with the screen size (800x480)

1.4. Add a first texture mapper

• Add texture mapper widget
• Increase scale to 2.7
• Resize and relocate the widget

1.5. Add a second texture mapper

• Add an other texture mapper widget
• Increase scale to 2
• Resize and relocate the widget

1.6. Add a toogle button

• Add a toogle button widget
• Change the preset of this widget
• Relocate the widget

2. Add the interaction

2.1 Rotation of the texture mapper 1

• Add a new interaction
• Trigger : On every N ticks
• Action : Rotate the texture mapper
• Choose texture mapper : textureMapper1
• Tick relative angle
• Z angle : 0.1

2.2 Rotation of the texture mapper 2

• Add a new interaction
• Trigger : On every N ticks
• Action : Rotate the texture mapper
• Choose texture mapper : textureMapper2
• Tick relative angle
• Z angle : -0.1

2.3 Add the activation / deactivation of NeoChrom

• Add a new intercation
• Trigger : button is clicked
• Action : Execute C++ code
• Code : copy the code below

#ifndef SIMULATOR
static uint8_t b_NeoChromEnabled = 1;
  if (b_NeoChromEnabled)
  {
    b_NeoChromEnabled = 0;
     // function natively in TouchGFX for STM32H7RS
    ((TouchGFXHAL*)touchgfx::HAL::getInstance())->activateNeoChrom(false); 
  }
  else
  {
    b_NeoChromEnabled = 1;
    // function natively in TouchGFX for STM32H7RS
    ((TouchGFXHAL*)touchgfx::HAL::getInstance())->activateNeoChrom(true); 
  }
#endif /*SIMULATOR*/

• Include : copy the code below

  #ifndef SIMULATOR
  #include <TouchGFXHAL.hpp>
  #endif/*SIMULATOR*/

3. Compile and download to the target

• connect STM32H7S78-DK CN7 to your PC
• launch Program and Run to Target
• Result on the target. Much more fluid on target than on this gif capture !