TIM_HandleTypeDef htim9;
UART_HandleTypeDef huart1;
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM9_Init(void);
static void MX_USART1_UART_Init(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_TIM9_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_0);
HAL_Delay(500);
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_0);
HAL_Delay(500);
HAL_TIM_IC_Start_IT(&htim9, TIM_CHANNEL_1);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief TIM9 Initialization Function
* @param None
* @retval None
*/
static void MX_TIM9_Init(void)
{
/* USER CODE BEGIN TIM9_Init 0 */
/* USER CODE END TIM9_Init 0 */
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_IC_InitTypeDef sConfigIC = {0};
/* USER CODE BEGIN TIM9_Init 1 */
/* USER CODE END TIM9_Init 1 */
htim9.Instance = TIM9;
htim9.Init.Prescaler = 21600;
htim9.Init.CounterMode = TIM_COUNTERMODE_UP;
htim9.Init.Period = 60000;
htim9.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim9.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim9) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim9, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_IC_Init(&htim9) != HAL_OK)
{
Error_Handler();
}
sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_FALLING;
sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
sConfigIC.ICFilter = 0;
if (HAL_TIM_IC_ConfigChannel(&htim9, &sConfigIC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM9_Init 2 */
/* USER CODE END TIM9_Init 2 */
}
/**
* @brief USART1 Initialization Function
* @param None
* @retval None
*/
static void MX_USART1_UART_Init(void)
{
/* USER CODE BEGIN USART1_Init 0 */
/* USER CODE END USART1_Init 0 */
/* USER CODE BEGIN USART1_Init 1 */
/* USER CODE END USART1_Init 1 */
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART1_Init 2 */
/* USER CODE END USART1_Init 2 */
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOE_CLK_ENABLE();
__HAL_RCC_GPIOH_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0|GPIO_PIN_1, GPIO_PIN_RESET);
/*Configure GPIO pin : PH3 */
GPIO_InitStruct.Pin = GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_PULLUP;
HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);
/*Configure GPIO pins : PB0 PB1 */
GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}
/**
* @brief This function handles TIM1 break interrupt and TIM9 global interrupt.
*/
void TIM1_BRK_TIM9_IRQHandler(void)
{
/* USER CODE BEGIN TIM1_BRK_TIM9_IRQn 0 */
/* USER CODE END TIM1_BRK_TIM9_IRQn 0 */
HAL_TIM_IRQHandler(&htim9);
/* USER CODE BEGIN TIM1_BRK_TIM9_IRQn 1 */
/* USER CODE END TIM1_BRK_TIM9_IRQn 1 */
}
/* USER CODE BEGIN 1 */
#include <stdio.h>
#include <string.h>
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
char text[50];
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_1);
sprintf(text, "%d\n", (__HAL_TIM_GET_COUNTER(htim)));
HAL_UART_Transmit(&huart1, (uint8_t*)text, strlen(text), 1000);
}
总结:1、用杜邦线将PE5、PH3短接,PH3为开发板KEY0 IO,PE5为TIM9_CH1 IO,没按一次KEY0,程序进入一次中断,通过串口输出此时TIM9_CNT数值
2、APB2输出时钟216MHz,PSC = 21600, ARR = 60000, 其他设置默认,所以TIM9每隔6s更新一次
3、每隔1s按一次按键,串口输出值相差大约10000,理论上每隔1s,TIM9->CNT计数10000次
4、MX_TIM9_Init();初始化定时器,HAL_TIM_IC_Start_IT(&htim9, TIM_CHANNEL_1);使能定时器以及捕获中断