2016用什么网站程序做流量,哪个网站适合 做红本抵押,企业网站搭建,网站调用视频目录
一、STM32中断概述
二、外部中断控制器EXTI
三、按键中断
四、串口中断 一、STM32中断概述 处理器中的中断在处理器中#xff0c;中断是一个过程#xff0c;即CPU在正常执行程序的过程中#xff0c;遇到外部/内部的紧急事件需要处理#xff0c;暂时中止当前程序的…目录
一、STM32中断概述
二、外部中断控制器EXTI
三、按键中断
四、串口中断 一、STM32中断概述 处理器中的中断在处理器中中断是一个过程即CPU在正常执行程序的过程中遇到外部/内部的紧急事件需要处理暂时中止当前程序的执行转而去为处理紧急的事件待处理完毕后再返回被打断的程序处继续往下执行。中断在计算机多任务处理尤其是即时系统中尤为重要。比如uCOSFreeRTOS等。
意义中断能提高CPU的效率同时能对突发事件做出实时处理。实现程序的并行化实现嵌入式系统进程之间的切换 进入中断 处理器自动保存现场到堆栈里 {PC, xPSR, R0-R3, R12, LR} 一旦入栈结束ISR便可开始执行 晚到的中断会重新取ISR地址但无需再次保存现场 退出中断 中断前的现场被自动从堆栈中恢复 一旦出栈完成继续执行被中断打断的指令 出栈的过程也可被打断使得随时可以响应新的中断 而不再进行 现场保存 NVIC的主要功能
中断管理支持异常及中断向量化处理支持嵌套中断n Cortex-M0处理器中每一个外部中断都可以被使能或者禁止并且可以被设置为挂起状态或者清除状态。处理器的中断可以电平的形式的也可以是脉冲形式的这样中断控制器就可以处理任何中断源 STM32F0中断和异常向量Cortex-M0内核可以处理15个内部异常和32个外部中断。 STM32F051实际上只使用了6个内部异常和28个外部中断。 当异常或中断发生时处理器会把PC设置为一个特定地址这一地址就称为异常向量。每一类异常源都对应一个特定的入口地址这些地址按照优先级排列以后就组成一张异常向量表。
向量化处理中断的好处 统的处理方式需要软件去完成。采用向量表处理异常M0处理器会从存储器的向量表中自动定位异常的程序入口。从发生异常到异常的处理中间的时间被缩减。 注中断和异常的区别 中断是微处理器外部发送的通过中断通道送入处理器内部一般是硬件引起的比如串口接收中断而异常通常是微处理器内部发生的大多是软件引起的比如除法出错异常特权调用异常等待。不管是中断还是异常微处理器通常都有相应的中断/异常服务程序 Ø 3个固定的优先级都是负值不能改变 Ø 四个可编程优先级用两个bit位表示00011011 Ø 优先级越小优先级越高 注不同优先级的中断同时发生优先处理优先级编号较小的那个 同样优先级的中断同时发生中断向量号较小的那个优先响应 二、外部中断控制器EXTI
在 STM32F05x 中共有最多 28 中断 / 事件线可用GPIO 口连接到 16 个外部中断 / 事件线该器件具有一组配置寄存器。系统配置控制器的主要用途如下
● 在部分 IO 口上启用或禁用 I2C 超快模式 (Fast Mode Plus) 。
● 重映射部分从 TIM16 和 TIM17 USART1 和 ADC 的 DMA 触发源到其它 不同的 DMA 通道上。
● 重映射存储器到代码起始区域。
● 管理连接到 GPIO 口的外部中断。
● 管理系统的可靠性特性。 系统配置控制器 (SYSCFG) 三、按键中断 Ø 1、使能相应的时钟 Ø2、配置GPIO管脚为中断功能 Ø3、设置中断优先级 Ø4、使能相应的中断 Ø5、实现中断服务程序 __weak表明他是一个若函数可以重写
/* USER CODE BEGIN 2 */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{if(GPIO_Pin GPIO_PIN_8){HAL_UART_Transmit(huart1, key int\n, 8, 100);}
} 这是一个处理中断的回调函数在里面判断一下是不是GPIO8然后进行处理
中断优先级和触发方式都可以图形化配置 四、串口中断 void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{if(huart-Instance USART1){printf(uart tx end\n);}
}extern uint8_t RX[10] ;
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{if(huart-Instance USART1){printf(REV : %x %x\n,RX[0],RX[1]);HAL_UART_Receive_IT(huart1, RX, 2);}
}
/********************************************************************************* File Name : main.c* Description : Main program body******************************************************************************** This notice applies to any and all portions of this file* that are not between comment pairs USER CODE BEGIN and* USER CODE END. Other portions of this file, whether * inserted by the user or by software development tools* are owned by their respective copyright owners.** COPYRIGHT(c) 2017 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 main.h
#include stm32f0xx_hal.h
#include usart.h
#include gpio.h/* USER CODE BEGIN Includes *//* USER CODE END Includes *//* Private variables ---------------------------------------------------------*//* USER CODE BEGIN PV */uint8_t RX[10] {0};/* Private variables ---------------------------------------------------------*//* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*//* USER CODE END PFP *//* USER CODE BEGIN 0 */
int fputc(int ch, FILE *f)
{while(!(USART1-ISR (17)));USART1-TDR ch;return ch;
}
/* 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();/* 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_USART1_UART_Init();/* USER CODE BEGIN 2 */HAL_UART_Transmit_IT(huart1,TX INT\n, 7);HAL_UART_Receive_IT(huart1, RX, 2);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */}/** System Clock Configuration
*/
void SystemClock_Config(void)
{RCC_OscInitTypeDef RCC_OscInitStruct;RCC_ClkInitTypeDef RCC_ClkInitStruct;RCC_PeriphCLKInitTypeDef PeriphClkInit;/**Initializes the CPU, AHB and APB busses clocks */RCC_OscInitStruct.OscillatorType RCC_OSCILLATORTYPE_HSI;RCC_OscInitStruct.HSIState RCC_HSI_ON;RCC_OscInitStruct.HSICalibrationValue 16;RCC_OscInitStruct.PLL.PLLState RCC_PLL_NONE;if (HAL_RCC_OscConfig(RCC_OscInitStruct) ! HAL_OK){_Error_Handler(__FILE__, __LINE__);}/**Initializes the CPU, AHB and APB busses clocks */RCC_ClkInitStruct.ClockType RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1;RCC_ClkInitStruct.SYSCLKSource RCC_SYSCLKSOURCE_HSI;RCC_ClkInitStruct.AHBCLKDivider RCC_SYSCLK_DIV1;RCC_ClkInitStruct.APB1CLKDivider RCC_HCLK_DIV1;if (HAL_RCC_ClockConfig(RCC_ClkInitStruct, FLASH_LATENCY_0) ! HAL_OK){_Error_Handler(__FILE__, __LINE__);}PeriphClkInit.PeriphClockSelection RCC_PERIPHCLK_USART1;PeriphClkInit.Usart1ClockSelection RCC_USART1CLKSOURCE_PCLK1;if (HAL_RCCEx_PeriphCLKConfig(PeriphClkInit) ! HAL_OK){_Error_Handler(__FILE__, __LINE__);}/**Configure the Systick interrupt time */HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);/**Configure the Systick */HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);/* SysTick_IRQn interrupt configuration */HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}/* USER CODE BEGIN 4 *//* USER CODE END 4 *//*** brief This function is executed in case of error occurrence.* param None* retval None*/
void _Error_Handler(char * file, int line)
{/* USER CODE BEGIN Error_Handler_Debug *//* User can add his own implementation to report the HAL error return state */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/*** }*/ /*** }
*/ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
