11 Memory & Power Management

Question 1

How much SRAM does STM32L475 have?

Answer 1

128KB of SRAM.

Question 2

What are the areas of memory?

Answer 2

User RAM, main stack(), FreeRTOS heap.

Question 3

What area are task stack, control block, and communication or synchronisation objects stored?

Answer 3

The task stack, control block and communication or synchronisation objects are stored in the FreeRTOS heap.

Question 4

What schema does STM32L475 use?

Answer 4

It uses heap_4 schema

Question 5

What is the TCB?

Answer 5

Task Control Block it is a structure with the following:
* Task Name.
* Task Priority
* Task Notification State and value.
* Task Stack pointer and high and low addresses.
* Lists used by the scheduler.

Question 6

Give a few examples of FreeRTOS Power Management?

Answer 6

• STM32L475 has 8 low power modes.
• The CPU can enter low power mode periodically
  when application runs.
• No application code can run and peripherals are
  disabled in low power mode.
• An interrupt is used to return to full power mode.
• Tickless Idle allows low power mode to be
  integrated with FreeRTOS system.