hard20 pts · first answer countsrtosfreertosinterrupts

Interrupt fires before the scheduler starts

A UART interrupt is enabled in main() before vTaskStartScheduler(), and its ISR calls xQueueSendFromISR. The system occasionally crashes at boot. Why?

A.xQueueSendFromISR only works when it is called from tasksB.Queues are not allowed to be created inside main()C.The ISR may run before the kernel is ready and ask for a switchD.The UART cannot receive bytes until the scheduler runs

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Interrupt fires before the scheduler starts

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