实验步骤

  ******************************************************************************* File Name          : main.c* Description        : Main program body******************************************************************************/* Includes ------------------------------------------------------------------*/
#include "stm32f1xx_hal.h"/* USER CODE BEGIN Includes *//* USER CODE END Includes *//* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef huart1;/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*//* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART1_UART_Init(void);/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*//* USER CODE END PFP *//* USER CODE BEGIN 0 */UART_HandleTypeDef UartHandle;
void UART0_Init(UART_HandleTypeDef* UartHandle){UartHandle->Instance = USART1;UartHandle->Init.BaudRate = 9600;UartHandle->Init.WordLength = UART_WORDLENGTH_8B;UartHandle->Init.StopBits = UART_STOPBITS_1;UartHandle->Init.Parity = UART_PARITY_NONE;UartHandle->Init.HwFlowCtl = UART_HWCONTROL_NONE;UartHandle->Init.Mode = UART_MODE_TX_RX;HAL_UART_Init(UartHandle);
}#define MAX_BITCOUNT 0xff
#define CHECK_DELAY 10
#define PERIMETER 2
void anti_jitter(int *bitcount, int state){*bitcount <<= 1;*bitcount &= MAX_BITCOUNT;*bitcount += state & 1;
}int PAcount=0, PAflag=0,mode = 0;
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){switch (GPIO_Pin){case GPIO_PIN_11:HAL_UART_Transmit(&UartHandle, (uint8_t*)"PA11 invokes\r\n", 14, 100);mode=1-mode;break;case GPIO_PIN_12:PAcount++;break;}
}//Timer InitializationTIM_HandleTypeDef TIM_Handle;TIM_ClockConfigTypeDef sClockSourceConfig;TIM_MasterConfigTypeDef sMasterConfig;int TIMflag = 0, TIMcount = 0;void TIM_Init(){TIM_Handle.Instance = TIM3;TIM_Handle.Init.Prescaler = 8000;TIM_Handle.Init.CounterMode = TIM_COUNTERMODE_UP;TIM_Handle.Init.Period = 199;TIM_Handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;HAL_TIM_Base_Init(&TIM_Handle);sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;HAL_TIM_ConfigClockSource(&TIM_Handle, &sClockSourceConfig);sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;HAL_TIMEx_MasterConfigSynchronization(&TIM_Handle, &sMasterConfig);}void TIM3_IRQHandler(void){HAL_TIM_IRQHandler(&TIM_Handle);
}int Route[5];
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim){TIMcount++;int cnt = 0;char sentence[64];int current = (TIMcount - 1) % 5;int previous = (current + 1) % 5;int distance = PAcount * PERIMETER;Route[current] = distance;if(mode == 0){cnt = sprintf(sentence, "Distance: %d\r\n", distance);}else{float speed = Route[current] - Route[previous];cnt = sprintf(sentence, "Speed: %f\r\n", speed / 1.0);}HAL_UART_Transmit(&UartHandle, (uint8_t*)sentence, cnt, 100);
}   /* USER CODE END 0 */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();/* Configure the system clock */SystemClock_Config();/* Initialize all configured peripherals */MX_GPIO_Init();MX_USART1_UART_Init();/* USER CODE BEGIN 2 */UART0_Init(&UartHandle);//HAL_UART_Transmit(&UartHandle, (uint8_t*)"Hello", 5, 100);TIM_Init();HAL_TIM_Base_Start_IT(&TIM_Handle);GPIO_InitTypeDef GPIO_InitStruct;__GPIOA_CLK_ENABLE();GPIO_InitStruct.Pin = GPIO_PIN_11;
GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);GPIO_InitStruct.Pin = GPIO_PIN_12;
GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);HAL_NVIC_SetPriority(EXTI15_10_IRQn,0,0);
HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */HAL_SuspendTick();HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);HAL_PWR_EnableSleepOnExit();   while (1){}/* USER CODE END 3 */}/** System Clock Configuration
*/
void SystemClock_Config(void)
{RCC_OscInitTypeDef RCC_OscInitStruct;RCC_ClkInitTypeDef RCC_ClkInitStruct;RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;RCC_OscInitStruct.HSIState = RCC_HSI_ON;RCC_OscInitStruct.HSICalibrationValue = 16;RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;HAL_RCC_OscConfig(&RCC_OscInitStruct);RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0);HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);/* SysTick_IRQn interrupt configuration */HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}/* USART1 init function */
void MX_USART1_UART_Init(void)
{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;HAL_HalfDuplex_Init(&huart1);}/** Configure pins as * Analog * Input * Output* EVENT_OUT* EXTI
*/
void MX_GPIO_Init(void)
{GPIO_InitTypeDef GPIO_InitStruct;/* GPIO Ports Clock Enable */__HAL_RCC_GPIOA_CLK_ENABLE();/*Configure GPIO pins : PA11 PA12 */GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_12;GPIO_InitStruct.Mode = GPIO_MODE_INPUT;GPIO_InitStruct.Pull = GPIO_NOPULL;HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);}/* USER CODE BEGIN 4 *//* USER CODE END 4 */#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/*** @}*/ /*** @}
*/ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/