01-stm32f103 f107VcT6初学练习：外部时钟的配置

只看该作者 · 2015-8-29 21:14

初学stm32,今天stm32的外部中断配置，因为板子上没有按键，所以用GPIO的PE3口输出高电平，PE2口设置为外部中断引脚，PD13控制LED。程序需要注意的是：1、必须将复用时钟打开。2、如果是上升沿触发，需要将PE2口设置为下拉电阻输入模式。3、中断向量的名字都在引导函数中查看，可以在stm32f10x_it.c中写它的中断函数。
代码如下（main.c）

#include "stm32_public.h"

void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void EXTI_Configuration(void);

int main(void)
{
RCC_Configuration();
GPIO_Configuration();
EXTI_Configuration();
NVIC_Configuration();

GPIO_SetBits(GPIOE,GPIO_Pin_2);
while(1);

}

void RCC_Configuration(void)
{
SystemInit();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
}

void GPIO_Configuration(void)
{

GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOD,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOE,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOE,&GPIO_InitStructure);
}
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void EXTI_Configuration(void)
{
EXTI_InitTypeDef EXTI_InitStructure;

EXTI_ClearITPendingBit(EXTI_Line3);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource3);

EXTI_InitStructure.EXTI_Line = EXTI_Line3;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);
}

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}

stm32f10x_it.c

void EXTI3_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line3)==SET)
{
EXTI_ClearITPendingBit(EXTI_Line3);Ï
if(GPIO_ReadOutputDataBit(GPIOD,GPIO_Pin_13)==Bit_RESET)
{

GPIO_SetBits(GPIOD,GPIO_Pin_13);
}
else
{
GPIO_ResetBits(GPIOD,GPIO_Pin_13);
}
}

}
stm32f10x_it.h
void EXTI3_IRQHandler(void);

在写程序的时候多查看固件库，虽然固件库有些不对，可以用于参考，并结合实际的库来使用（用go to define ""查看其函数）。