STM32F407定时器实现方波频率占空比测量_基于stm32f407的频率计

参考代码

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
	此算法频率越低，占空比测量越精确
	1kHz时,占空比测量可以精确到小数点后三位，如37.2%（第四位不稳定）
	周期测量,可以精确到10ns之内，如1000ns（1k）-> 1007左右浮动	
	1Hz时，T = 1006290 ns，误差控制在1%之内，占空比测量准确
	100Hz时，T = 10 ns，duty = 0.333333
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "adc.h"
#include "dac.h"
#include "dma.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"
 
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "stdio.h"
#include <stdlib.h>
#include "sys.h"
#include "delay.h"
#include "math.h"
/* USER CODE END Includes */
 
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
 
/*define定义*/
#define  FFT_LENGTH          1024        //FFT长度，默认是1024点FFT
#define  SAMPLE_LENGTH       1024        //采样点数
#define max_number 0xffffffff
#define over_flow  0x3
#define k 1000
 
 
volatile uint8_t g_adc_dma_sta = 0;
volatile uint8_t   flg = 0; 						//0为未开始，1已经开始，2为结束
volatile uint32_t  capture_Buf_timer2[3] = {0};   //存放计数值
volatile uint32_t  num_period = 0;			//溢出次数
uint32_t high_time_timer2;   //高电平时间
uint32_t whole_time_timer2;   //高电平时间
 
uint32_t capture_Buf[3] = {0};   //存放计数值
uint8_t capture_Cnt = 0;    //状态标志位
uint32_t high_time;   //高电平时间
 
//float fft_amp_buf[FFT_LENGTH];       //幅度输出数组
//float fft_phase_buf[FFT_LENGTH];       //相位输出数组
// Complex data[FFT_LENGTH];
 
//float fft_inputbuf[FFT_LENGTH*2];      //FFT输入输出数组，此数组为arm_cfft_radix4_f32的输入输出数组，前一个元素为实部，后一个为虚部，每两个元素代表一个点.
//float fft_outputbuf[FFT_LENGTH];       //arm_cmplx_mag_f32()幅度输出数组
uint16_t ADC1_Value[SAMPLE_LENGTH];
float voltage[SAMPLE_LENGTH]; 
/* USER CODE END PTD */
 
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
int fputc(int ch, FILE *f)
{
    while ((USART1->SR & 0X40) == 0);               /* 等待上一个字符发送完成 */
 
    USART1->DR = (uint8_t)ch;                       /* 将要发送的字符 ch 写入到DR寄存器 */
    return ch;
}
int fgetc(FILE *f)
{
  uint8_t ch = 0;
  HAL_UART_Receive(&huart1, &ch, 1, 0xffff);
  return ch;
}
/* USER CODE END PD */
 
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE BEGIN 0 */
uint8_t RxBuff[1];      //进入中断接收数据的数组
uint8_t DataBuff[10]; //保存接收到的数据的数组
int RxLine=0;           //接收到的数据长度
 
float frequency;
/* USER CODE END 0 */
 
/*测频测周变量定义*/
 
 
/*相位变量定义*/
	uint32_t capture_period=0,capture_sta=0,capture_period1=0,capture_sta1=0;
	float Phase=0,capture_period2=0;
 
/* USER CODE END PM */
 
/* Private variables ---------------------------------------------------------*/
 
/* USER CODE BEGIN PV */
 
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
 
/* USER CODE END PFP */
 
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
 
/* USER CODE END 0 */
 
/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */
 
  /* USER CODE END 1 */
 
  /* MCU Configuration--------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* USER CODE BEGIN Init */
 
  /* USER CODE END Init */
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_USART1_UART_Init();
  MX_TIM3_Init();
  MX_DAC_Init();
  MX_ADC1_Init();
  MX_TIM2_Init();
  MX_TIM4_Init();
  /* USER CODE BEGIN 2 */
  HAL_UART_Receive_IT(&huart1, (uint8_t *)RxBuff, 1);
  
 
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  
 
	  
					//测量方波的频率和相位差
  switch (flg){
	case 0:
		flg = 1;
		__HAL_TIM_SET_CAPTUREPOLARITY(&htim2, TIM_CHANNEL_2, TIM_INPUTCHANNELPOLARITY_RISING);
		HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_2);	//启动输入捕获       或者: __HAL_TIM_ENABLE(&htim2);
		__HAL_TIM_ENABLE_IT(&htim2,TIM_IT_UPDATE);   //使能更新中断
		break;
	case 3:
		high_time_timer2 = num_period*max_number+(capture_Buf_timer2[1]- capture_Buf_timer2[0]);    //高电平时间
		break;
	case 4:
		whole_time_timer2 = num_period*max_number+(capture_Buf_timer2[2]- capture_Buf_timer2[0]);    //总时间
 
		printf("T = %d ns\r\n",whole_time_timer2/3);
		printf("duty = %.3f \r\n",high_time_timer2*1.0/whole_time_timer2*1.0);
 
		flg = 0;
		num_period = 0;
		high_time_timer2 = 0;
		whole_time_timer2 = 0;
 
		break;
				
  }
 
 
  /* USER CODE END 2 */
 
 
    /* USER CODE END WHILE */
 
    /* USER CODE BEGIN 3 */
 
	
 }
  /* USER CODE END 3 */
}
 
/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
 
  /** Configure the main internal regulator output voltage
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
 
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 168;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 4;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
 
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
  {
    Error_Handler();
  }
}
 
/* USER CODE BEGIN 4 */
/* USER CODE BEGIN 4 */
 
	/* 
代码分析
	__HAL_TIM_SET_CAPTUREPOLARITY包含了TIM_RESET_CAPTUREPOLARITY（重置）和TIM_SET_CAPTUREPOLARITY（设置极性）操作
	   __HAL_TIM_DISABLE(&htim3);
	   TIM_RESET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_1);   //一定要先清除原来的设置！！
	   TIM_SET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_1,TIM_ICPOLARITY_RISING);//配置TIM5通道1上升沿捕获
	   __HAL_TIM_ENABLE(&htim3);//使能定时器5
	   
	   或者
	   
       __HAL_TIM_DISABLE(&htim3);
	   __HAL_TIM_SET_CAPTUREPOLARITY(&htim3, TIM_CHANNEL_1, TIM_INPUTCHANNELPOLARITY_RISING);
	   __HAL_TIM_ENABLE(&htim3);//使能定时器5
	*/
 
/* USER CODE BEGIN 1 */
 
 
//定时器更新中断（计数溢出）中断处理回调函数， 该函数在HAL_TIM_IRQHandler中会被调用
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
    if(htim->Instance == TIM2){
    //每次溢出时间为65536us
    if(flg==1)//还未成功捕获
    {
                if((num_period&0X3F)==0X3F)//电平太长了
                {
                    flg=4;        //标记成功捕获了一次
                }else num_period ++;
    }
    }
}
 
 
 
//定时器输入捕获中断处理回调函数，该函数在HAL_TIM_IRQHandler中会被调用
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)//捕获中断发生时执行
  { 
 
		if(htim->Instance == TIM2)//PB3
		{
			switch (flg){
	
			case 1:
				capture_Buf_timer2[0] = HAL_TIM_ReadCapturedValue(&htim2,TIM_CHANNEL_2);//获取当前的捕获值.
				__HAL_TIM_SET_CAPTUREPOLARITY(&htim2,TIM_CHANNEL_2,TIM_ICPOLARITY_FALLING);  //设置为下降沿捕获
				flg = 2;
				break;
			case 2:
				capture_Buf_timer2[1] = HAL_TIM_ReadCapturedValue(&htim2,TIM_CHANNEL_2);//获取当前的捕获值.
			    __HAL_TIM_SET_CAPTUREPOLARITY(&htim2, TIM_CHANNEL_2, TIM_INPUTCHANNELPOLARITY_RISING);
				flg = 3;
				break;
			case 3:
				capture_Buf_timer2[2] = HAL_TIM_ReadCapturedValue(&htim2,TIM_CHANNEL_2);//获取当前的捕获值.
				HAL_TIM_IC_Stop_IT(&htim2,TIM_CHANNEL_2); //停止捕获   或者: __HAL_TIM_DISABLE(&htim2);
				flg = 4; 
				break;
			}
 
		}
}
  
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
		g_adc_dma_sta = 1;
};
/* USER CODE END 1 */
/* USER CODE END 4 */
 
/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}
 
#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

部分代码分析	
__HAL_TIM_SET_CAPTUREPOLARITY包含了
TIM_RESET_CAPTUREPOLARITY（重置）和TIM_SET_CAPTUREPOLARITY（设置极性）操作
__HAL_TIM_DISABLE(&htim3);//关闭定时器3
TIM_RESET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_1);   //清除原来的设置
TIM_SET_CAPTUREPOLARITY(&htim3,TIM_CHANNEL_1,TIM_ICPOLARITY_RISING);//配置TIM3通道1上升沿捕获
__HAL_TIM_ENABLE(&htim3);//使能定时器5
	   
或者使用下面代码
	   
__HAL_TIM_DISABLE(&htim3);
__HAL_TIM_SET_CAPTUREPOLARITY(&htim3, TIM_CHANNEL_1, TIM_INPUTCHANNELPOLARITY_RISING);
__HAL_TIM_ENABLE(&htim3);//使能定时器3

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