STM32 EXTI的配置
另外EXTI的映射關(guān)系可以看下圖,是和管腳號對應(yīng)的,比較好記
本文引用地址:http://m.butianyuan.cn/article/201611/315977.htm(1)Main
C語言:Codee#14817
/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ 實驗平臺 : ST 官方三合一套件
+ 硬件 : STM32F103C8T6
+ 開發(fā)平臺 : IAR For ARM 5.40
+ 仿真器 : J-Link
+ 日期 : 2010-11-4
+ 頻率 :HSE = 8MHz ,主頻 = 72MHz
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
#include "includes.h"
/*******************************************************************************
== Main 函數(shù) ==
*******************************************************************************/
int main(void)
{
RCC_Configuration(); //配置系統(tǒng)時鐘
NVIC_Configuration(); //配置 NVIC 和 Vector Table
SysTick_Config(); //配置SysTick的精確延時
GPIO_Configuration();
EXTI_Configuration();
LED1_HIGH ; LED2_HIGH ; LED3_HIGH ; LED4_HIGH ; // 初始化讓燈全滅
while (1)
{
if( KEY_UP == 0 )
{ LED1_LOW ;}
if( KEY_DOWN == 0 )
{ LED2_LOW ;}
if( KEY_LEFT == 0 )
{ LED3_LOW ;}
if( KEY_RIGHT == 0 )
{ LED4_LOW ;}
}
}
(2)Unique_Device_ID.c
C語言:Codee#14816
#include "includes.h"
/*******************************************************************************
== 全局變量 ==
*******************************************************************************/
vu32 TimingDelay; // 精確延時在SysTick中斷里用的計數(shù)變量
/*******************************************************************************
* Function Name : RCC_Configuration 配置時鐘
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
//將外設(shè) RCC寄存器重設(shè)為缺省值
RCC_DeInit();
//設(shè)置外部高速晶振(HSE)
RCC_HSEConfig(RCC_HSE_ON);
//等待 HSE 起振
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
//預(yù)取指緩存使能
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
//設(shè)置代碼延時值
//FLASH_Latency_2 2 延時周期
FLASH_SetLatency(FLASH_Latency_2);
//設(shè)置 AHB 時鐘(HCLK)
//RCC_SYSCLK_Div1 AHB 時鐘 = 系統(tǒng)時鐘
RCC_HCLKConfig(RCC_SYSCLK_Div1);
//設(shè)置高速 AHB 時鐘(PCLK2)
//RCC_HCLK_Div2 APB1 時鐘 = HCLK / 2
RCC_PCLK2Config(RCC_HCLK_Div2);
//設(shè)置低速 AHB 時鐘(PCLK1)
//RCC_HCLK_Div2 APB1 時鐘 = HCLK / 2
RCC_PCLK1Config(RCC_HCLK_Div2);
// PLLCLK = 8MHz * 9 = 72 MHz
//設(shè)置 PLL 時鐘源及倍頻系數(shù)
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
//使能或者失能 PLL
RCC_PLLCmd(ENABLE);
//等待指定的 RCC 標志位設(shè)置成功 等待PLL初始化成功
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
//設(shè)置系統(tǒng)時鐘(SYSCLK) 設(shè)置PLL為系統(tǒng)時鐘源
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
//等待PLL成功用作于系統(tǒng)時鐘的時鐘源
// 0x00:HSI 作為系統(tǒng)時鐘
// 0x04:HSE作為系統(tǒng)時鐘
// 0x08:PLL作為系統(tǒng)時鐘
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_ALL, ENABLE);
//使能或者失能 APB2 外設(shè)時鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
}
/*******************************************************************************
* Function Name : NVIC_Configuration 配置中斷優(yōu)先級
* Description : Configures NVIC and Vector Table base location.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure_EXTI_LINE7;
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
//===== NVIC_EXTI_PB7 ===================================================
/* Configure the NVIC Preemption Priority Bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
/* Enable the EXTI PB7 Interrupt */
NVIC_InitStructure_EXTI_LINE7.NVIC_IRQChannel = EXTI9_5_IRQChannel; // 配置使能指定的IRQ(Interrupt ReQuest中斷請求)通道
NVIC_InitStructure_EXTI_LINE7.NVIC_IRQChannelPreemptionPriority = 0; // 配置IRQ的 組 優(yōu)先級
NVIC_InitStructure_EXTI_LINE7.NVIC_IRQChannelSubPriority = 0; // 配置IRQ的 從 優(yōu)先級
NVIC_InitStructure_EXTI_LINE7.NVIC_IRQChannelCmd = ENABLE; // 配置IRQ 使能
NVIC_Init(&NVIC_InitStructure_EXTI_LINE7); // 初始化 UART1_IRQ
}
/*******************************************************************************
* Function Name : GPIO_Configuration 配置管教
* Description : Configures the different GPIO ports.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure_LED_PORTB;
GPIO_InitTypeDef GPIO_InitStructure_KEY_PORTA;
GPIO_InitTypeDef GPIO_InitStructure_KEY_PORTB;
GPIO_InitTypeDef GPIO_InitStructure_KEY_PORTC;
//==== LED =======================================================
GPIO_InitStructure_LED_PORTB.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15 ;
GPIO_InitStructure_LED_PORTB.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure_LED_PORTB.GPIO_Mode = GPIO_Mode_Out_PP; //推挽輸出
GPIO_Init(GPIOB, &GPIO_InitStructure_LED_PORTB);
//==== KEY =======================================================
GPIO_InitStructure_KEY_PORTA.GPIO_Pin = GPIO_Pin_0 ;
GPIO_InitStructure_KEY_PORTA.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure_KEY_PORTA.GPIO_Mode = GPIO_Mode_IPU ; //上拉輸入
GPIO_Init(GPIOA, &GPIO_InitStructure_KEY_PORTA);
GPIO_InitStructure_KEY_PORTB.GPIO_Pin = GPIO_Pin_7 ;
GPIO_InitStructure_KEY_PORTB.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure_KEY_PORTB.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空輸入 ,外部中斷按鍵
GPIO_Init(GPIOB, &GPIO_InitStructure_KEY_PORTB);
GPIO_InitStructure_KEY_PORTC.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15 ;
GPIO_InitStructure_KEY_PORTC.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure_KEY_PORTC.GPIO_Mode = GPIO_Mode_IPU; //上拉輸入
GPIO_Init(GPIOC, &GPIO_InitStructure_KEY_PORTC);
}
/*******************************************************************************
* Function Name : EXTI_Configuration 配置外部中斷管教
* Description : Configures the EXTI
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void EXTI_Configuration(void)
{
EXTI_InitTypeDef EXTI_InitStructure_EXTI_LINE7;
/* Connect EXTI Line7 to PB7 */
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource7); // 配置 管腳PB7用作外部中斷線路
/* Configure EXTI Line7 to generate an interrupt on falling edge */
EXTI_InitStructure_EXTI_LINE7.EXTI_Line = EXTI_Line7; //配置 使能或失能的外部線路
EXTI_InitStructure_EXTI_LINE7.EXTI_Mode = EXTI_Mode_Interrupt; //配置 EXTI線路為中斷請求 (或者是事件請求)
EXTI_InitStructure_EXTI_LINE7.EXTI_Trigger = EXTI_Trigger_Falling; //配置 使能線路的觸發(fā)邊沿 -- 下降沿觸發(fā)中斷
EXTI_InitStructure_EXTI_LINE7.EXTI_LineCmd = ENABLE; //配置 狀態(tài)為使能
EXTI_Init(&EXTI_InitStructure_EXTI_LINE7); // 初始化外部中斷線路7
/* Generate software interrupt: simulate a falling edge applied on EXTI line 7 */
EXTI_GenerateSWInterrupt(EXTI_Line7); //線路7產(chǎn)生一個軟件中斷
}
/*******************************************************************************
* Function Name : SysTick_Config SysTick設(shè)置
* Description : Configures SysTick
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void SysTick_Config(void)
{
/* Disable SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Disable);
/* Disable the SysTick Interrupt */
SysTick_ITConfig(DISABLE);
/* Configure HCLK clock as SysTick clock source */
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
/* SysTick interrupt each 1000 Hz with HCLK equal to 72MHz */
SysTick_SetReload(9000);
/* Enable the SysTick Interrupt */
SysTick_ITConfig(ENABLE);
}
/*******************************************************************************
* Function Name : 精確延時函數(shù)
*******************************************************************************/
void Delay_Ms(u32 nTime)
{
/* Enable the SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Enable);
TimingDelay = nTime;
while(TimingDelay != 0);
/* Disable SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Disable);
/* Clear SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Clear);
}
(4)stm32f10x_it.c
C語言:Codee#14818
/* Includes ------------------------------------------------------------------*/
#include "includes.h"
//#include "stm32f10x_it.h"
// ... ...
/*******************************************************************************
* Function Name : EXTI9_5_IRQHandler
* Description : This function handles External lines 9 to 5 interrupt request.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
// LINE : 407
void EXTI9_5_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line7) == SET) // 讀取中斷狀態(tài)
{
LED1_HIGH ; LED2_HIGH ; LED3_HIGH ; LED4_HIGH ; // 燈全滅
EXTI_ClearITPendingBit(EXTI_Line7); // 清除標志位
}
}
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