AN4228 datasheet(45/90 Pages) STMICROELECTRONICS

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AN4228

Firmware migration using the library

EXTI_InitStructure.EXTI_Line = EXTI_Line0;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

4.7

NVIC interrupt configuration

This section explains how to configure the NVIC interrupts (IRQ).

STM32F1 series

In STM32F1 series, the NVIC supports:



up to 68 interrupts (68 ex. Core IT



A programmable priority level of 0-15 for each interrupt (4 bits of interrupt priority are

used). A higher level corresponds to a lower priority; level 0 is the highest interrupt

priority.



Grouping of priority values into group priority and sub priority fields.



Dynamic changing of priority levels.

The Cortex-M3 exceptions are managed by CMSIS functions:



Enabling and configuration of the preemption priority and sub priority of the selected

IRQ channels according to the Priority grouping configuration.

STM32F3 series

In STM32F3 series, the NVIC supports:



Up to 66 interrupts



16 programmable priority levels.



The priority level of an interrupt should not be changed after it is enabled.

The Cortex-M4 exceptions are managed by CMSIS functions:



Enabling and configuration of the priority of the selected IRQ channels. The priority

ranges between 0 and 15. Lower priority values give a higher priority.

The table below gives the MISC driver API correspondence between STM32F10x and

STM32F3xx Libraries.

Table 22. STM32F10x and STM32F3xx MISC driver API correspondence

STM32F10x MISC Driver API

STM32F3xx MISC Driver API

void NVIC_Init(NVIC_InitTypeDef*

NVIC_InitStruct);

void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct);

void NVIC_SystemLPConfig(uint8_t

LowPowerMode, FunctionalState NewState);

void NVIC_SystemLPConfig(uint8_t

LowPowerMode, FunctionalState NewState);

void SysTick_CLKSourceConfig(uint32_t

SysTick_CLKSource);

void SysTick_CLKSourceConfig(uint32_t

SysTick_CLKSource);

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