STM32L0的定制器资源:

本实验使用TIM6

HSI频率是16Mhz,则单指令周期是1/16Mhz

预分频设置为1600,则每跑1600下,定时器加1,相当于定时器加1的时间是1600*(1/16Mhz)=100us

定义周期为10000,则计数到10000时候,定时器溢出,定时器溢出的时间为10000*100us=1s

有了这几个基本参数,我们按照如下设置CUBEMX

HAL的库的调用:

HAL_TIM_Base_Init这个已经在CubeMX自动生成和调用了,不用再管了。

HAL_TIM_Base_Start_IT需要自己写代码启动中断模式

另外计数器溢出回调函数需要自己添加HAL_TIM_PeriodElapsedCallback

实现1s进入一次回调函数,串口返回一条指令:

测试代码如下:

/**
******************************************************************************
* File Name : main.c
* Description : Main program body
******************************************************************************
*
* COPYRIGHT(c) 2015 STMicroelectronics
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32l0xx_hal.h" /* USER CODE BEGIN Includes */ /* USER CODE END Includes */ /* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef htim6; UART_HandleTypeDef huart2; /* 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_TIM6_Init(void);
static void MX_USART2_UART_Init(void); /* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/ /* USER CODE END PFP */ /* USER CODE BEGIN 0 */ /* 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_TIM6_Init();
MX_USART2_UART_Init(); /* USER CODE BEGIN 2 */
//启动定时器中断
if(HAL_TIM_Base_Start_IT(&htim6) != HAL_OK)
{
/* Starting Error */
while();
} unsigned char txData[]={"helloworld\r\n"};
HAL_UART_Transmit(&huart2,txData,sizeof(txData)-,0xffff); /* USER CODE END 2 */ /* Infinite loop */
/* USER CODE BEGIN WHILE */
while ()
{
/* USER CODE END WHILE */ /* USER CODE BEGIN 3 */
// HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET);
// HAL_Delay(1000);
// HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET);
// HAL_Delay(1000); HAL_GPIO_TogglePin(GPIOA,GPIO_PIN_5);
HAL_Delay(); }
/* USER CODE END 3 */ } /** System Clock Configuration
*/
void SystemClock_Config(void)
{ RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInit; __PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = ;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
HAL_RCC_OscConfig(&RCC_OscInitStruct); RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
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); PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2;
PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit); HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/); HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK); } /* TIM6 init function */
void MX_TIM6_Init(void)
{ TIM_MasterConfigTypeDef sMasterConfig; htim6.Instance = TIM6;
htim6.Init.Prescaler = ;
htim6.Init.CounterMode = TIM_COUNTERMODE_UP;
htim6.Init.Period = ;
HAL_TIM_Base_Init(&htim6); sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
HAL_TIMEx_MasterConfigSynchronization(&htim6, &sMasterConfig); } /* USART2 init function */
void MX_USART2_UART_Init(void)
{ huart2.Instance = USART2;
huart2.Init.BaudRate = ;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
huart2.Init.OneBitSampling = UART_ONEBIT_SAMPLING_DISABLED;
huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
HAL_UART_Init(&huart2); } /** Configure pins as
* Analog
* Input
* Output
* EVENT_OUT
* EXTI
*/
void MX_GPIO_Init(void)
{ GPIO_InitTypeDef GPIO_InitStruct; /* GPIO Ports Clock Enable */
__GPIOA_CLK_ENABLE(); /*Configure GPIO pin : PA5 */
GPIO_InitStruct.Pin = GPIO_PIN_5;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); } /* USER CODE BEGIN 4 */ void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if (htim->Instance == htim6.Instance)
{
unsigned char txData[]={"in HAL_TIM_PeriodElapsedCallback\r\n"};
HAL_UART_Transmit(&huart2,txData,sizeof(txData)-,0xffff);
}
} /* 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****/

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