How can I re-enable the stm32f103's external interrupt after I disable it?

Question

I use

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE; 
NVIC_Init(&NVIC_InitStructure);

to enable the interrupt and then use

NVIC_InitStructure.NVIC_IRQChannelCmd=DISABLE; 
NVIC_Init(&NVIC_InitStructure);

to disable it. So how can I re-enable the interrupt, use ICER,ISER or any other ways?

See also: [What are the various ways to disable and re-enable interrupts in STM32 microcontrollers in order to implement atomic access guards?](https://stackoverflow.com/q/71626597/4561887) — Gabriel Staples, Mar 26 '22 at 16:40

score 2 · Accepted Answer · answered Jul 04 '21 at 15:01

2

To enable and disable interrupts in NVIC, just use the relevant CMSIS functions:

void NVIC_EnableIRQ(IRQn_Type IRQn);
void NVIC_DisableIRQ(IRQn_Type IRQn);

answered Jul 04 '21 at 15:01

Tagli

score 1 · Answer 2 · answered Jul 05 '21 at 13:32

There are CMSIS library functions to enable the interrupts and disable the interrupts.

using void NVIC_EnableIRQ(IRQn_Type IRQn); you can re enable the disabled interrupt.

you need to mention the IRQ number for your interrupt to enable it again.

However if you want to enable or disable all interrupts in one go, then you must use ARM functions in STM32. these are

__disable_irq();
__enable_irq();

By using these you can pretty mush enable disable all the interrupts on ARM core.

2 Answers2