Choosing the right heap scheme in FreeRTOS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to select the heap scheme that uses a simple first-fit algorithm.

FreeRTOS

void vPortDefineHeap() {
    #define configFRTOS_MEMORY_SCHEME [1]
}

Drag options to blanks, or click blank then click option'

Aheap_1

Bheap_2

Cheap_3

Dheap_4

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing heap_3 which is more complex and supports coalescing.

heap_1 uses a simple first-fit algorithm with no coalescing, suitable for very simple applications.

2fill in blank

medium

Complete the code to select the heap scheme that supports memory freeing and coalescing.

FreeRTOS

void vPortDefineHeap() {
    #define configFRTOS_MEMORY_SCHEME [1]
}

Drag options to blanks, or click blank then click option'

Aheap_3

Bheap_2

Cheap_5

Dheap_1

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing heap_2 which supports freeing but not coalescing.

heap_3 supports both memory freeing and coalescing, making it suitable for applications with dynamic memory usage.

3fill in blank

hard

Fix the error in the code by choosing the correct heap scheme that uses multiple memory regions.

FreeRTOS

void vPortDefineHeap() {
    #define configFRTOS_MEMORY_SCHEME [1]
}

Drag options to blanks, or click blank then click option'

Aheap_1

Bheap_2

Cheap_4

Dheap_3

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing heap_3 which supports coalescing but not multiple regions.

heap_4 supports multiple memory regions, allowing the heap to span different memory areas.

4fill in blank

hard

Fill both blanks to define a heap scheme that supports memory freeing and uses a first-fit algorithm.

FreeRTOS

void vPortDefineHeap() {
    #define configFRTOS_MEMORY_SCHEME [1]
    void *heapMemory = pvPortMalloc([2]);
}

Drag options to blanks, or click blank then click option'

Aheap_2

Bheap_1

C1024

D2048

Attempts:

3 left

💡 Hint

Common Mistakes

Using heap_1 which does not support freeing.

Choosing 2048 which is larger than needed here.

heap_2 supports freeing memory and uses a first-fit algorithm. Allocating 1024 bytes is a common example size.

5fill in blank

hard

Fill all three blanks to define a heap scheme that supports multiple regions, freeing, and coalescing with a heap size of 4096 bytes.

FreeRTOS

void vPortDefineHeap() {
    #define configFRTOS_MEMORY_SCHEME [1]
    static uint8_t ucHeap[[2]];
    HeapRegion_t xHeapRegions[] = {
        { ucHeap, [3] },
        { NULL, 0 }
    };
    vPortDefineHeapRegions(xHeapRegions);
}

Drag options to blanks, or click blank then click option'

Aheap_4

B4096

D2048

Attempts:

3 left

💡 Hint

Common Mistakes

Using heap_3 which does not support multiple regions.

Mismatching heap sizes in array and region.

heap_4 supports multiple regions, freeing, and coalescing. The heap size is set to 4096 bytes for this example.