73 lines
3.0 KiB
C
73 lines
3.0 KiB
C
#include "stm32f4xx.h" // Device header
|
||
#include "stm32f4xx_conf.h"
|
||
#include "CAN.h"
|
||
|
||
/*==================== 定时器资源分配 ====================
|
||
TIM1(高级) ················PWM1~PWM4
|
||
TIM2 ················定时器
|
||
TIM3 ················
|
||
TIM4 ················蜂鸣器发声
|
||
TIM5 ················混色LED三色控制
|
||
TIM6(基本) ················PID闭环
|
||
TIM7(基本) ················遥控器连接检测
|
||
TIM8(高级) ················PWM5~PWM7
|
||
TIM9 ················
|
||
TIM10 ················
|
||
TIM11 ················
|
||
TIM12 ················
|
||
TIM13 ················CAN总线设备连接检测
|
||
TIM14 ················
|
||
=============================================================*/
|
||
|
||
/*
|
||
*函数简介:TIM2定时器初始化
|
||
*参数说明:无
|
||
*返回类型:无
|
||
*备注:默认定时1ms
|
||
*备注:Freq=Sys_APB1TIM/(PSC+1)/(ARR+1)=84MHz/(PSC+1)/(ARR+1)
|
||
*/
|
||
void TIM_Init(void)
|
||
{
|
||
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);//开启时钟
|
||
|
||
TIM_InternalClockConfig(TIM2);//选择时基单元的时钟(此处为内部时钟),TIM_ITRxExternalClockConfig()接ITRx时钟,TIM_TIxExternalClockConfig()接TIx捕获通道时钟,TIM_ETRClockMode1Config()接ETR时钟(选择外部时钟模式1),TIM_ETRClockMode2Config()接ETR时钟(选择外部时钟模式2)
|
||
|
||
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;//配置时基单元（配置参数）
|
||
TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;//配置时钟分频为1分频
|
||
TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;//配置计数器模式为向上计数
|
||
TIM_TimeBaseInitStructure.TIM_Period=200-1;//配置自动重装值ARR
|
||
TIM_TimeBaseInitStructure.TIM_Prescaler=420-1;//配置分频值PSC,默认频率800Hz
|
||
TIM_TimeBaseInitStructure.TIM_RepetitionCounter=0;//配置重复计数单元的置为0
|
||
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructure);//初始化TIM2
|
||
|
||
TIM_ClearFlag(TIM2,TIM_FLAG_Update);//清除配置时基单元产生的中断标志位
|
||
|
||
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);//使能更新中断
|
||
|
||
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//选择NVIC分组
|
||
|
||
NVIC_InitTypeDef NVIC_InitStructure;//配置NVIC（配置参数）
|
||
NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn;//选择中断通道为TIM2
|
||
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;//使能中断通道
|
||
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;//TIM2的抢占优先级
|
||
NVIC_InitStructure.NVIC_IRQChannelSubPriority=2;//TIM2的响应优先级
|
||
NVIC_Init(&NVIC_InitStructure);//初始化NVIC
|
||
|
||
TIM_Cmd(TIM2,ENABLE);//启动定时器
|
||
}
|
||
|
||
/*
|
||
*函数简介:TIM2定时器更新中断函数
|
||
*参数说明:无
|
||
*返回类型:无
|
||
*备注:无
|
||
*/
|
||
void TIM2_IRQHandler(void)
|
||
{
|
||
if(TIM_GetITStatus(TIM2,TIM_IT_Update)==SET)//检测TIM2更新
|
||
{
|
||
TIM_ClearITPendingBit(TIM2,TIM_IT_Update);//清除标志位
|
||
//函数体
|
||
}
|
||
}
|