[Solved] What is wrong with this FreeRTOS queue usage? QueueHandle_t queue = xQueueCreate(1, sizeof(uint32_t)); uint32_t data = 100; xQueueSend(queue, &data, 0); uint32_t received;... | FreeRTOS

FreeRTOS - Task Notifications

What is wrong with this FreeRTOS queue usage?

QueueHandle_t queue = xQueueCreate(1, sizeof(uint32_t));
uint32_t data = 100;
xQueueSend(queue, &data, 0);
uint32_t received;
xQueueReceive(queue, &received, 0);
printf("%lu\n", received);

AData type mismatch in xQueueCreate

BQueue size is too small for one item

CxQueueSend and xQueueReceive use zero block time causing possible failure

DMissing queue deletion after use

Step-by-Step Solution

Solution:

Step 1: Analyze block time usage
Using zero block time means send or receive may fail if queue is full or empty.
Step 2: Check for error handling
No check is done for success of send or receive, so data may not be sent or received.
Final Answer:
Zero block time may cause send or receive to fail silently. -> Option C
Quick Check:
Always check return values when using zero block time [OK]

Quick Trick: Check return values when using zero block time in queues [OK]

Common Mistakes:

Ignoring return values of xQueueSend/xQueueReceive
Assuming zero block time guarantees success
Confusing queue size with data size

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What is wrong with this FreeRTOS queue usage?

Step 1: Analyze block time usage

Step 2: Check for error handling

Final Answer:

Quick Check:

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