之前用F1進行測試發現極限性能是二十兆左右，最近用F429測試極限測量頻率為68M左右！
原理很簡單就是用一個定時器做閥門，每隔一段時間進入一次中斷開啟測量，另一個定時器配置為外部時鐘源模式2，每來一個脈沖就進行計數加一，這樣還不夠，要將每次溢出的次數也做記錄，才能將極限測量值提高，當然我水平有限，只能到這些了，有更好辦法的也可以分享下~
以下是定時器部分核心代碼：
/**
******************************************************************************
* File Name : TIM.c
* Description : This file provides code for the configuration
* of the TIM instances.
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2019 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "tim.h"
/* USER CODE BEGIN 0 */
uint16_t num=0;
uint8_t i=0;
uint32_t frequency=0;
uint32_t cnt=0;
/* USER CODE END 0 */
TIM_HandleTypeDef htim1;
TIM_HandleTypeDef htim8;
/* TIM1 init function */
void MX_TIM1_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
htim1.Instance = TIM1;
htim1.Init.Prescaler = 0;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.Period = 0xFFFF;
htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim1.Init.RepetitionCounter = 0;
htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_ETRMODE2;
sClockSourceConfig.ClockPolarity = TIM_CLOCKPOLARITY_NONINVERTED;
sClockSourceConfig.ClockPrescaler = TIM_CLOCKPRESCALER_DIV1;
sClockSourceConfig.ClockFilter = 0;
if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
}
/* TIM8 init function */
void MX_TIM8_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
htim8.Instance = TIM8;
htim8.Init.Prescaler = 1799;
htim8.Init.CounterMode = TIM_COUNTERMODE_UP;
htim8.Init.Period = 4999;
htim8.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim8.Init.RepetitionCounter = 0;
htim8.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim8) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim8, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim8, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
}
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* tim_baseHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(tim_baseHandle->Instance==TIM1)
{
/* USER CODE BEGIN TIM1_MspInit 0 */
/* USER CODE END TIM1_MspInit 0 */
/* TIM1 clock enable */
__HAL_RCC_TIM1_CLK_ENABLE();
__HAL_RCC_GPIOE_CLK_ENABLE();
/**TIM1 GPIO Configuration
PE7 ------> TIM1_ETR
*/
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;
HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
/* TIM1 interrupt Init */
HAL_NVIC_SetPriority(TIM1_UP_TIM10_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM1_UP_TIM10_IRQn);
/* USER CODE BEGIN TIM1_MspInit 1 */
/* USER CODE END TIM1_MspInit 1 */
}
else if(tim_baseHandle->Instance==TIM8)
{
/* USER CODE BEGIN TIM8_MspInit 0 */
/* USER CODE END TIM8_MspInit 0 */
/* TIM8 clock enable */
__HAL_RCC_TIM8_CLK_ENABLE();
/* TIM8 interrupt Init */
HAL_NVIC_SetPriority(TIM8_UP_TIM13_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM8_UP_TIM13_IRQn);
/* USER CODE BEGIN TIM8_MspInit 1 */
/* USER CODE END TIM8_MspInit 1 */
}
}
void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* tim_baseHandle)
{
if(tim_baseHandle->Instance==TIM1)
{
/* USER CODE BEGIN TIM1_MspDeInit 0 */
/* USER CODE END TIM1_MspDeInit 0 */
/* Peripheral clock disable */
__HAL_RCC_TIM1_CLK_DISABLE();
/**TIM1 GPIO Configuration
PE7 ------> TIM1_ETR
*/
HAL_GPIO_DeInit(GPIOE, GPIO_PIN_7);
/* TIM1 interrupt Deinit */
HAL_NVIC_DisableIRQ(TIM1_UP_TIM10_IRQn);
/* USER CODE BEGIN TIM1_MspDeInit 1 */
/* USER CODE END TIM1_MspDeInit 1 */
}
else if(tim_baseHandle->Instance==TIM8)
{
/* USER CODE BEGIN TIM8_MspDeInit 0 */
/* USER CODE END TIM8_MspDeInit 0 */
/* Peripheral clock disable */
__HAL_RCC_TIM8_CLK_DISABLE();
/* TIM8 interrupt Deinit */
HAL_NVIC_DisableIRQ(TIM8_UP_TIM13_IRQn);
/* USER CODE BEGIN TIM8_MspDeInit 1 */
/* USER CODE END TIM8_MspDeInit 1 */
}
}
/* USER CODE BEGIN 1 */
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if(htim->Instance==TIM1)
{
num++;
}
if(htim->Instance==TIM8)
{
if(i<19)
{
cnt+=__HAL_TIM_GET_COUNTER(&htim1);
__HAL_TIM_SET_COUNTER(&htim1,0);
i++;
}
else
{
cnt+= __HAL_TIM_GET_COUNTER(&htim1);
__HAL_TIM_SET_COUNTER(&htim1,0);
frequency=cnt+num*65536;
num=0;
printf("定時器2:%ld\n",frequency);
i=0;
cnt=0;
}
}
}
/* USER CODE END 1 */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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