Kernel Initialization; Kernel Processes And Tasks - ST STM32CubeF4 User Manual

Kernel description
3.2

Kernel initialization

The first task of the kernel is to initialize the hardware and firmware resources to make them
available to its internal processes and the modules around it. The kernel starts by initializing
the HAL, system clocks and then the hardware resources needed during the middleware
components:
• LEDs and Touchscreen
•
SDRAM/SRAM
• Backup SRAM
•
RTC
• Quad-SPI Flash memory
•
Audio Interface
Note: Not all the hardware resources can be used in all demonstration platforms, according to the
availability and to the integrated modules.
Once the low level resources are initialized, the kernel performs the STemWin GUI library
initialization and prepares the following common services:
•
Memory manager
•
Storage units
•
Modules manager
•
Kernel Log
Upon full initialization phase, the kernel adds and links the system and user modules to the
demonstration core.
3.3

Kernel processes and tasks

The kernel is composed of two main tasks managed by FreeRTOS through the CMSIS-OS
wrapping layer:
•
GUI Thread: this task Initializes the demonstration main menu and then handles the
graphical background task when requested by the STemWin;
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