新手上路
- 积分
- 23
- 金钱
- 23
- 注册时间
- 2021-5-12
- 在线时间
- 4 小时
|
1金钱
仿照很多教程的输入捕获测频率的代码，结果都失败了，实在是不知道到底哪里配置出了问题。
用探索者的板子测量自己PWM输出的频率。
#ifndef __TIMER_H
#define __TIMER_H
#include "stm32f4xx.h"
#include "sys.h"
void TIMx_NVIC_Configuration(void);
void TIM_PWMINPUT_Config(void);
void TIM_PWMOUTPUT_Config(void);
void TIMx_GPIO_Config(void);
#endif
上面是定时器头文件
#include "timer.h"
void TIMx_GPIO_Config(void)
{
/*定义一个GPIO_InitTypeDef类型的结构体*/
GPIO_InitTypeDef GPIO_InitStructure;
/*开启LED相关的GPIO外设时钟*/
RCC_AHB1PeriphClockCmd (RCC_AHB1Periph_GPIOA, ENABLE);
RCC_AHB1PeriphClockCmd (RCC_AHB1Periph_GPIOC, ENABLE);
/* 定时器复用引脚 */
GPIO_PinAFConfig(GPIOA,GPIO_PinSource5,GPIO_AF_TIM2);
GPIO_PinAFConfig(GPIOC,GPIO_PinSource6,GPIO_AF_TIM8);
/* 通用定时器PWM输出引脚 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 高级控制定时器PWM输入捕获引脚 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
/*
* 注意：TIM_TimeBaseInitTypeDef结构体里面有5个成员，TIM6和TIM7的寄存器里面只有
* TIM_Prescaler和TIM_Period，所以使用TIM6和TIM7的时候只需初始化这两个成员即可，
* 另外三个成员是通用定时器和高级定时器才有.
*-----------------------------------------------------------------------------
* TIM_Prescaler 都有
* TIM_CounterMode TIMx,x[6,7]没有，其他都有（基本定时器）
* TIM_Period 都有
* TIM_ClockDivision TIMx,x[6,7]没有，其他都有(基本定时器)
* TIM_RepetitionCounter TIMx,x[1,8]才有(高级定时器)
*-----------------------------------------------------------------------------
*/
void TIM_PWMOUTPUT_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
// 开启TIMx_CLK,x[2,3,4,5,12,13,14]
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* 累计 TIM_Period个后产生一个更新或者中断*/
//当定时器从0计数到9999，即为10000次，为一个定时周期
TIM_TimeBaseStructure.TIM_Period = 10-1;
// 通用定时器2时钟源TIMxCLK = HCLK/2=84MHz
// 设定定时器频率为=TIMxCLK/(TIM_Prescaler+1)=100KHz
TIM_TimeBaseStructure.TIM_Prescaler = 84-1;
// 采样时钟分频
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
// 计数方式
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
// 初始化定时器TIMx, x[1,8]
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* PWM输出模式配置 */
/* 配置为PWM模式1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
/* PWM脉冲宽度 */
TIM_OCInitStructure.TIM_Pulse = 5;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
/* 使能通道1 */
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
/*使能通道1重载*/
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
// 使能定时器
TIM_Cmd(TIM2, ENABLE);
}
void TIM_PWMINPUT_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
// 开启TIMx_CLK,x[1,8]
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 1000-1;
// 高级控制定时器时钟源TIMxCLK = HCLK=168MHz
// 设定定时器频率为=TIMxCLK/(TIM_Prescaler+1)=100KHz
TIM_TimeBaseStructure.TIM_Prescaler = 168-1;
// 计数方式
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
// 初始化定时器TIMx, x[1,8]
TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);
/* IC1捕获：上升沿触发 TI1FP1 */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM8, &TIM_ICInitStructure);
/* IC2捕获：下降沿触发 TI1FP2 */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_IndirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM8, &TIM_ICInitStructure);
/* 选择定时器输入触发: TI1FP1 */
TIM_SelectInputTrigger(TIM8, TIM_TS_TI1FP1);
/* 选择从模式: 复位模式 */
TIM_SelectSlaveMode(TIM8, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM8,TIM_MasterSlaveMode_Enable);
/* 使能高级控制定时器 */
TIM_Cmd(TIM8, ENABLE);
/* 使能捕获/比较2中断请求 */
TIM_ITConfig(TIM8, TIM_IT_CC1, ENABLE);
}
void TIMx_NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
// 设置中断组为0
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
// 设置中断来源
NVIC_InitStructure.NVIC_IRQChannel = TIM8_CC_IRQn;
// 设置抢占优先级
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
// 设置子优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
感觉配置没什么问题
__IO uint16_t IC2Value = 0;
__IO uint16_t IC1Value = 0;
__IO float DutyCycle = 0;
__IO float Frequency = 0;
void TIM8_CC_IRQHandler(void)
{
/* 清除定时器捕获/比较1中断 */
TIM_ClearITPendingBit(TIM8, TIM_IT_CC1);
/* 获取输入捕获值 */
IC1Value = TIM_GetCapture1(TIM8);
IC2Value = TIM_GetCapture2(TIM8);
if (IC1Value != 0)
{
/* 占空比计算 */
DutyCycle = (float)(IC2Value * 100) / IC1Value;
/* 频率计算 */
Frequency = 168000000/168/(float)IC1Value;
printf("占空比：%0.2f%% 频率：%0.2fHz\r\n",DutyCycle,Frequency);
}
else
{
DutyCycle = 0;
Frequency = 0;
}
}
int main(void)
{
uart_init(115200);
delay_init(84);
TIMx_GPIO_Config();
TIMx_NVIC_Configuration();
TIM_PWMOUTPUT_Config();
TIM_PWMINPUT_Config();
printf("\r\n这是一个定时器输入捕获例程\r\n");
while(1)
{
}
}
实在不知道还有什么要配置的，求大佬帮忙看看
|
|
/2 
|手机版|OpenEdv-开源电子网
( 粤ICP备12000418号-1 )
发表于 2021-7-14 13:00:29
