State how to enable an interrupt by a NVIC function. What is the difference betw

Question

State how to enable an interrupt by a NVIC function. What is the difference between the following two statements?

NVIC->ISER[1] |= (1<<6); //enableIRQ(USART2_IRQn)

NVIC_EnableIRQ  ( 38 );   // 38: USART2 interrupt no

Find out the NVIC functions for the following operation

Resets the whole system including peripherals.

Sets the priority grouping.

Returns the value of the current priority grouping.

Enables the interrupt IRQn.

Disables the interrupt IRQn.

Sets the priority for the interrupt IRQn.

Returns the priority for the specified interrupt.

Sets the interrupt IRQn pending.

Returns the pending status of the interrupt IRQn.

Clears the pending status of the interrupt IRQn, if it is not already running or active.

Returns the active status for the interrupt IRQn.

Resets the whole system including peripherals.

Sets the priority grouping.

Returns the value of the current priority grouping.

Enables the interrupt IRQn.

Disables the interrupt IRQn.

Sets the priority for the interrupt IRQn.

Returns the priority for the specified interrupt.

Sets the interrupt IRQn pending.

Returns the pending status of the interrupt IRQn.

Clears the pending status of the interrupt IRQn, if it is not already running or active.

Returns the active status for the interrupt IRQn.

Explanation / Answer

Solution:

Note: multiple questions asked, please post unanswered questions separately

State how to enable an interrupt by a NVIC function.

What is the difference between the following two statements?

NVIC->ISER[1] |= (1<<6); //enableIRQ(USART2_IRQn)

NVIC_EnableIRQ  ( 38 );   // 38: USART2 interrupt no

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