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发表于 2020-3-9 14:56:38
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本帖最后由 方正波 于 2020-3-9 14:58 编辑
/* Includes ------------------------------------------------------------------*/
//#define osObjectsPublic // define objects in main module
#include "osObjects.h" // RTOS object definitions
#include "stm32f30x_gpio.h"
#include "timer_interrupt.h"
/* Includes ------------------------------------------------------------------*/
void TIM4_PWM_Init(int arr ,int psc) //定时器4产生pwm
{
GPIO_InitTypeDef GPIO_InitStructure; //结构体初始化
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; //结构体初始化
TIM_OCInitTypeDef TIM_OCInitStructure; //结构体初始化
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOD, ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
GPIO_Init(GPIOD, &GPIO_InitStructure); //初始化GPIO
GPIO_PinAFConfig(GPIOD, GPIO_PinSource14, GPIO_AF_2);
/* TIM1 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4 , ENABLE);
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = psc;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//TIM向上计数模式
TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;// 设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //初始化TIM4
/* Channel 1Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//比较输出使能
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;//比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCNPolarity_High;//TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity =TIM_OCPolarity_Low;// TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC3Init(TIM4, &TIM_OCInitStructure);
TIM_SetCompare3(TIM4,360); //设定脉冲的高电平固定为10us
TIM_Cmd(TIM4, ENABLE);//使能TIM4
/* TIM1 Main Output Enable */
TIM_CtrlPWMOutputs(TIM4, ENABLE);
}
void TIM3_Cap_Init(int arr, int psc) //初始化定时器3，用来计数脉冲数的
{
GPIO_InitTypeDef GPIO_InitStructure; //GPIO口结构体初始化
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; //时钟结构体初始化
NVIC_InitTypeDef NVIC_InitStruct; //中断结构体初始化
TIM_ICInitTypeDef TIM3_ICInitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE); //使能PC端口时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //开定时器3时钟
/* GPIO port initialization */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PC.9 端口配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度为50MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //设置下拉
GPIO_Init(GPIOC, &GPIO_InitStructure); //根据设定参数初始化GPIOC.9
//GPIO_PinAFConfig(GPIOC, GPIO_PinSource9, GPIO_AF_2); //复用TIM3_CH4
//TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable); //主从模式选择
//TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset); //复位模式-选中的触发输入（TRGI）的上升沿初始化计数器，并且产生一个更新信号
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Period = arr; //计数周期
TIM_TimeBaseStructure.TIM_Prescaler = psc; //分频系数
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //TIM_CKD_DIV1=0，也就是时钟分频因子为0
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数方式为向上计数
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //初始化TIM3
TIM_ARRPreloadConfig(TIM3, ENABLE);
TIM_Cmd(TIM3, ENABLE); //使能TIM3
/*设置 TIM3 的输入比较参数，开启输入捕获 */
TIM3_ICInitStructure.TIM_Channel = TIM_Channel_4; //选择输入端 IC1 映射到 TI4上
TIM3_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
TIM3_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到 TI1 上
TIM3_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频
TIM3_ICInitStructure.TIM_ICFilter = 0x00; //IC1F=0000 配置输入滤波器 不滤波
TIM_ICInit(TIM3, &TIM3_ICInitStructure);
/* Interrupt group initialization */
NVIC_InitStruct.NVIC_IRQChannel = TIM3_IRQn; //设置中断通道为TIM3_IRQn
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1; //抢占优先级1
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1; //相应优先级1
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStruct); //使能TIMX外设
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE); //允许更新中断和捕获中断
}
u16 TIM3CH4_CAPTURE_STA = 0; //输入捕获状态
u16 TIM3CH4_CAPTURE_VAL; //输入捕获值
void TIM3_IRQHandler(void) //定时器3中断服务程序
{
if ((TIM3CH4_CAPTURE_STA & 0X80) == 0) //如果未成功捕获
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //判断是否为更新中断 TIM_GetITStatus(TIM3,TIM_IT_Update) != RESET)
{
if (TIM3CH4_CAPTURE_STA & 0X40) //已经捕获到高电平了
{
if ((TIM3CH4_CAPTURE_STA & 0X3F) == 0X3F) //高电平太长了
{
TIM3CH4_CAPTURE_STA |= 0X80; //标记成功捕获了一次
TIM3CH4_CAPTURE_STA = 0XFFFF;
}
else
TIM3CH4_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM3, TIM_IT_CC4) != RESET) //如果发生捕获事件
{
if (TIM3CH4_CAPTURE_STA & 0X40) //捕获到一个下降沿
{
TIM3CH4_CAPTURE_STA |= 0X80; //标记成功捕获到一次高电平脉宽
TIM3CH4_CAPTURE_STA = TIM_GetCapture1(TIM3);
TIM_OC1PolarityConfig(TIM3, TIM_ICPolarity_Rising); //CC1P=0 设置为上升沿捕获
}
else //还未开始,第一次捕获上升沿
{
TIM3CH4_CAPTURE_STA = 0; //清空
TIM3CH4_CAPTURE_VAL = 0;
TIM_SetCounter(TIM3, 0); //计数值清零
TIM3CH4_CAPTURE_STA |= 0X40; //标记捕获到了上升沿
TIM_OC1PolarityConfig(TIM3, TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
}
}
}
TIM_ClearITPendingBit(TIM3, TIM_IT_CC4 | TIM_IT_Update); //清除中断标志位
}
主函数：
u32 temp=0; // 计算高电平的时间
extern u8 TIM3CH4_CAPTURE_STA; //输入捕获状态
extern u16 TIM3CH4_CAPTURE_VAL; //输入捕获值
int main (void)
{
V_NVIC_Configuration();
V_UsartInit();
TIM4_PWM_Init(499,7199);//不分频。PWM频率=72000/(899+1)=80Khz //定时器1s中断一次
TIM3_Cap_Init(0XFFFF,72-1); //T=(arr+1)*(psc+1)/系统时钟
while(1)
{
if(TIM3CH4_CAPTURE_STA&0X80)//成功捕获到了一次上升沿
{
temp=TIM3CH4_CAPTURE_STA&0X3F;
temp*=65536;//溢出时间总和 0
temp+=TIM3CH4_CAPTURE_VAL;//得到总的高电平时间
printf("检测到高电平脉冲：%d us.\r\n",temp);//打印总的高点平时间
TIM3CH4_CAPTURE_STA=0; //开启下一次捕获
}
}
}
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发表于 2020-1-6 16:10:45
