【STM32-学习笔记-4-】PWM、输入捕获(PWMI)
1、PWM
PWM配置
- 配置时基单元
- 配置输出比较单元
- 配置输出PWM波的端口
#include "stm32f10x.h" // Device header
void PWM_Init(void)
{
//**配置输出PWM波的端口*****************************************************************
RCC_APB2PeriphClockCmd (RCC_APB2Periph_GPIOA, ENABLE);// 使能GPIOA端口的时钟,因为我们要使用这个端口来输出PWM信号
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
//*************************************************************************************
//**配置时基单元************************************************************************
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);//使能时钟
TIM_InternalClockConfig(TIM2);// 配置定时器的内部时钟模式
//这段代码的作用是将指定的定时器配置为内部时钟模式,即将定时器的时钟源设置为内部时钟,而不是外部信号
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;//定义定时器基本时间配置结构体
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;//设置定时器时钟分频(1分频)
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;//计数模式(向上计数)
TIM_TimeBaseInitStruct.TIM_Period = 100 - 1;//自动重装载寄存器的值ARR
TIM_TimeBaseInitStruct.TIM_Prescaler = 720 - 1;//预分频器的值PSC//1khz
TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);
//*************************************************************************************
//**配置输出比较单元********************************************************************
TIM_OCInitTypeDef TIM_OCInitStruct;//定义输出比较初始化结构体
TIM_OCStructInit(&TIM_OCInitStruct);//结构体赋初始值
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;//输出比较模式
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;//输出比较极性
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;//输出使能
TIM_OCInitStruct.TIM_Pulse = 0;//设定CCR寄存器的值;更改CRR的值,以控制占空比(CCR/(ARR+1))
TIM_OC1Init(TIM2, &TIM_OCInitStruct);
//*************************************************************************************
TIM_Cmd(TIM2, ENABLE);//启用定时器,PB0口输出PWM波
}
void PWM_SetCompare1(uint16_t Compare)//设置CRR的值以控制占空比(CCR/(ARR+1))
{
TIM_SetCompare1(TIM2, Compare);
}
2、输入捕获配置
#include "stm32f10x.h" // Device header
//PWMI模式
//输入捕获测频率 PA6口
void IC_Init(void)
{
//配置输入捕获的io口
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6;//PA6对应TIM3
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
//配置时基单元
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//开启时钟
TIM_InternalClockConfig(TIM3);//配置定时器的内部时钟模式
//这段代码的作用是将指定的定时器配置为内部时钟模式,
//即将定时器的时钟源设置为内部时钟,而不是外部信号
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;//1分频
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;//计数模式(向上计数)
TIM_TimeBaseInitStruct.TIM_Period = 65536 - 1;//自动重装载寄存器的值ARR
TIM_TimeBaseInitStruct.TIM_Prescaler = 72 - 1;//预分频器的值PSC
TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct);
//配置输入捕获单元
TIM_ICInitTypeDef TIM_ICInitStruct;
TIM_ICInitStruct.TIM_Channel = TIM_Channel_1;//选择通道1
TIM_ICInitStruct.TIM_ICFilter = 0x10;//指定输入捕获过滤器
TIM_ICInitStruct.TIM_ICPolarity = TIM_ICPolarity_Rising;//上升沿
TIM_ICInitStruct.TIM_ICPrescaler = TIM_ICPSC_DIV1;//1分频
TIM_ICInitStruct.TIM_ICSelection = TIM_ICSelection_DirectTI;//直连通道
TIM_ICInit(TIM3, &TIM_ICInitStruct);//自动配置通道2,下降沿
TIM_PWMIConfig(TIM3, &TIM_ICInitStruct);
//设置触发源
TIM_SelectInputTrigger(TIM3, TIM_TS_TI1FP1);
//选择从模式
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
//启动定时器
TIM_Cmd(TIM3, ENABLE);
//*************************************************************************************
}
uint32_t IC_GetFreq(void)//获取频率
{
return 1000000 / ((TIM_GetCapture1(TIM3)) + 1);
//TIM_GetCapture1此函数可获取CCR1捕获/比较器中的值
}
uint32_t IC_GetDuty(void)
{
return ((TIM_GetCapture2(TIM3) + 1) * 100)/(TIM_GetCapture1(TIM3) + 1);
}
3、编码器
#include "stm32f10x.h" // Device header
void Encoder2_Init(void)
{
//配置GPIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
//配置时基单元
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//开启定时器时钟
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;//不分频
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStruct.TIM_Period = 65536 - 1;//ARR
TIM_TimeBaseInitStruct.TIM_Prescaler = 1 - 1;//PSC
TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct);
TIM_ICInitTypeDef TIM_ICInitStruct;
TIM_ICStructInit(&TIM_ICInitStruct);
//配置通道1的滤波器和极性
TIM_ICInitStruct.TIM_Channel = TIM_Channel_1;
TIM_ICInitStruct.TIM_ICFilter = 0xF;
TIM_ICInit(TIM3, &TIM_ICInitStruct);
//配置通道2的滤波器和极性
TIM_ICInitStruct.TIM_Channel = TIM_Channel_2;
TIM_ICInitStruct.TIM_ICFilter = 0xF;
TIM_ICInit(TIM3, &TIM_ICInitStruct);
TIM_EncoderInterfaceConfig(TIM3,
TIM_EncoderMode_TI12,
TIM_ICPolarity_Rising, //不反向
TIM_ICPolarity_Rising);//不反向-可控制极性
TIM_Cmd(TIM3, ENABLE);
}
int16_t Encoder_Get(void)
{
return TIM_GetCounter(TIM3);
}
int16_t Encoder_GetSpeed(void)
{
int16_t Temp_Count = TIM_GetCounter(TIM3);
TIM_SetCounter(TIM3, 0);//计数器清零
return Temp_Count;
}
原文地址:https://blog.csdn.net/qq_63040946/article/details/145094483
免责声明:本站文章内容转载自网络资源,如本站内容侵犯了原著者的合法权益,可联系本站删除。更多内容请关注自学内容网(zxcms.com)!