[1 mark//1 punt]
On an STM32 microcontroller, you configure three interrupts with the following NVIC preemption priorities (lower number = higher priority):

EXTI interrupt for the ultrasonic sensor echo: priority 1
UART interrupt for receiving commands: priority 2
EXTI interrupt for the LMT01 temperature sensor pulses: priority 3

While the LMT01 EXTI ISR is running, a UART interrupt becomes pending, and shortly after that an ultrasonic sensor EXTI interrupt also becomes pending. All interrupts are enabled. Which statement best describes what the NVIC (Nested Vectored Interrupt Controller) and MCU will do?
//
Op 'n STM32-mikrobeheerder konfigureer jy drie onderbrekings met die volgende NVIC-voorrangprioriteite (laer getal = hoër prioriteit):

EXTI-onderbreking vir die ultrasoniese sensor-eggo: prioriteit 1
UART-onderbreking vir die ontvangs van bevele: prioriteit 2
EXTI-onderbreking vir die LMT01-temperatuursensorpulse: prioriteit 3

Terwyl die LMT01 EXTI ISR loop, word 'n UART-onderbreking hangende, en kort daarna word 'n ultrasoniese sensor EXTI-onderbreking ook hangende. Alle onderbrekings word geaktiveer. Watter stelling beskryf die beste wat die NVIC (Nested Vectored Interrupt Controller) en MCU sal doen?

Question

[1 mark//1 punt] 
 On an STM32 microcontroller, you configure three interrupts with the following NVIC preemption priorities (lower number = higher priority): 
 
 EXTI interrupt for the ultrasonic sensor echo: priority 1 
 UART interrupt for receiving commands: priority 2 
 EXTI interrupt for the LMT01 temperature sensor pulses: priority 3 
 
 While the LMT01 EXTI ISR is running, a UART interrupt becomes pending, and shortly after that an ultrasonic sensor EXTI interrupt also becomes pending. All interrupts are enabled. Which statement best describes what the NVIC (Nested Vectored Interrupt Controller) and MCU will do? 
 // 
 Op 'n STM32-mikrobeheerder konfigureer jy drie onderbrekings met die volgende NVIC-voorrangprioriteite (laer getal = hoër prioriteit): 
 
 EXTI-onderbreking vir die ultrasoniese sensor-eggo: prioriteit 1 
 UART-onderbreking vir die ontvangs van bevele: prioriteit 2 
 EXTI-onderbreking vir die LMT01-temperatuursensorpulse: prioriteit 3 
 
 Terwyl die LMT01 EXTI ISR loop, word 'n UART-onderbreking hangende, en kort daarna word 'n ultrasoniese sensor EXTI-onderbreking ook hangende. Alle onderbrekings word geaktiveer. Watter stelling beskryf die beste wat die NVIC (Nested Vectored Interrupt Controller) en MCU sal doen?

Accepted Answer

The ultrasonic EXTI interrupt will preempt (interrupt) the LMT01 EXTI ISR immediately, even though it arrived after the UART interrupt, because it has higher priority than both UART and the LMT01 EXTI.//Die ultrasoniese EXTI-onderbreking sal die LMT01 EXTI ISR onmiddellik vooruitloop, al het dit na die UART-onderbreking aangekom, want dit het 'n hoër prioriteit as beide UART en die LMT01 EXTI.

Answer

The UART interrupt will preempt (i.e. interrupt or over-ride) the LMT01 EXTI ISR immediately, and the ultrasonic EXTI interrupt will wait until the UART ISR completes, because UART arrived first.//Die UART-onderbreking sal die LMT01 EXTI ISR onmiddellik vooruitloop, en die ultrasoniese EXTI-onderbreking sal wag totdat die UART ISR voltooi is, want UART het eerste opgedaag.

Answer

Both UART and ultrasonic EXTI interrupts will preempt (interrupt) the LMT01 EXTI ISR at the same time, and the CPU will alternate between their ISRs in a round‑robin fashion.//Beide UART- en ultrasoniese EXTI-onderbrekings sal die LMT01 EXTI ISR gelyktydig vooruitloop, en die SVE sal tussen hul ISR'e ​​op 'n rondomtalie-wyse afwissel.

Answer

Neither UART nor the ultrasonic EXTI interrupt can preempt (interrupt) the LMT01 EXTI ISR once it has started; both will run only after the LMT01 ISR returns.//Nóg UART nóg die ultrasoniese EXTI-onderbreking kan die LMT01 EXTI ISR vooruitloop sodra dit begin het; albei sal eers loop nadat die LMT01 ISR terugkeer.

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[1 mark//1 punt] On an STM32 microcontroller, you configure three interrupts w...

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