PM0214 datasheet(203/245 Pages) STMICROELECTRONICS

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PM0214

Core peripherals

244

4.3.10

NVIC design hints and tips

Ensure software uses correctly aligned register accesses. The processor does not support

unaligned accesses to NVIC registers. See the individual register descriptions for the

supported access sizes.

An interrupt can enter pending state even it is disabled. Disabling an interrupt only prevents

the processor from taking that interrupt.

Before programming VTOR to relocate the vector table, ensure the vector table entries of

the new vector table are setup for fault handlers, NMI and all enabled exception like

interrupts. For more information see Section 4.4.4: Vector table offset register (VTOR) on

page 212.

NVIC programming hints

Software uses the CPSIE I and CPSID I instructions to enable and disable interrupts. The

CMSIS provides the following intrinsic functions for these instructions:

void __disable_irq(void) // Disable Interrupts

void __enable_irq(void) // Enable Interrupts

In addition, the CMSIS provides a number of functions for NVIC control, including:

The input parameter IRQn is the IRQ number, see Table 17: Properties of the different

exception types on page 37. For more information about these functions see the CMSIS

documentation.

Table 48. CMSIS functions for NVIC control

CMSIS interrupt control function

Description

void NVIC_SetPriorityGrouping(uint32_t priority_grouping) Set the priority grouping

void NVIC_EnableIRQ(IRQn_t IRQn)

Enable IRQn

void NVIC_DisableIRQ(IRQn_t IRQn)

Disable IRQn

uint32_t NVIC_GetPendingIRQ (IRQn_t IRQn)

Return true (IRQ-Number) if IRQn is

pending

void NVIC_SetPendingIRQ (IRQn_t IRQn)

Set IRQn pending

void NVIC_ClearPendingIRQ (IRQn_t IRQn)

Clear IRQn pending status

uint32_t NVIC_GetActive (IRQn_t IRQn)

Return the IRQ number of the active

interrupt

void NVIC_SetPriority (IRQn_t IRQn, uint32_t priority)

Set priority for IRQn

uint32_t NVIC_GetPriority (IRQn_t IRQn)

Read priority of IRQn

void NVIC_SystemReset (void)

Reset the system

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