141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
#include "main.h"
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/**
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* @brief System Clock Configuration
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* @retval None
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*/
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void systemClockInit(void)
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{
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RCC_OscInitTypeDef RCC_OscInitStruct = {0};
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RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
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/** Initializes the RCC Oscillators according to the specified parameters
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* in the RCC_OscInitTypeDef structure.
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*/
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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RCC_OscInitStruct.HSEState = RCC_HSE_ON;
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RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
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RCC_OscInitStruct.HSIState = RCC_HSI_ON;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
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RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
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if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
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{
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Error_Handler();
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}
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/** Initializes the CPU, AHB and APB buses clocks
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*/
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RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
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|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
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RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
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RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
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if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
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{
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Error_Handler();
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}
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}
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/**
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* @brief 精确微秒延时函数（基于SysTick）
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* @param us 要延时的微秒数（1\~65535）
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* @note 适用于72MHz系统时钟，误差<±1us
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*/
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void delayUs(uint16_t us)
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{
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uint32_t start = SysTick->VAL;
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uint32_t ticks = us * (SystemCoreClock / 1000000); // 72MHz时ticks=72*us
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// 处理SysTick重载值边界情况
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if(start < ticks)
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{
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// 需要跨过重载点的情况
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while(SysTick->VAL > start); // 等待VAL从重载值递减到start
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while(SysTick->VAL < (SysTick->LOAD - (ticks - start)));
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}
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else
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{
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// 普通情况
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while((SysTick->VAL < start) && (SysTick->VAL >= (start - ticks)));
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}
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}
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///**
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// * @brief 微秒级延时函数
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// * @param us 微秒数 (0\~65535)
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// * @note 基于SysTick定时器实现，系统时钟72MHz时误差<1us
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// */
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//void delayUs(uint16_t us)
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//{
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// uint32_t ticks = us * (SystemCoreClock / 1000000);
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// uint32_t start = DWT->CYCCNT;
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//
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// // 如果DWT不可用，则使用SysTick
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// if((CoreDebug->DEMCR & CoreDebug_DEMCR_TRCENA_Msk) && DWT->CTRL & DWT_CTRL_CYCCNTENA_Msk)
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// {
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// while((DWT->CYCCNT - start) < ticks);
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// }
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// else
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// {
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// // 备用方案：SysTick实现（需要先初始化）
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// HAL_SYSTICK_Config(SystemCoreClock / 1000000); // 重装载值=72
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// HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
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//
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// for(; us > 0; us--)
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// {
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// SysTick->VAL = 0; // 清空计数器
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// while(!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk));
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// }
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// }
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//}
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///**
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// * @brief 初始化DWT(Data Watchpoint Trace)用于精确计时
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// * @retval None
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// */
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//void dwtInit(void)
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//{
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// if(!(CoreDebug->DEMCR & CoreDebug_DEMCR_TRCENA_Msk))
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// {
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// CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
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// DWT->CYCCNT = 0;
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// DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
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// }
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//}
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/**
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* @brief This function is executed in case of error occurrence.
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* @retval None
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*/
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void Error_Handler(void)
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{
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/* USER CODE BEGIN Error_Handler_Debug */
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/* User can add his own implementation to report the HAL error return state */
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__disable_irq();
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while (1)
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{
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}
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/* USER CODE END Error_Handler_Debug */
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}
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#ifdef USE_FULL_ASSERT
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/**
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* @brief Reports the name of the source file and the source line number
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* where the assert_param error has occurred.
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* @param file: pointer to the source file name
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* @param line: assert_param error line source number
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* @retval None
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*/
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void assert_failed(uint8_t *file, uint32_t line)
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{
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/* USER CODE BEGIN 6 */
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/* User can add his own implementation to report the file name and line number,
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ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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/* USER CODE END 6 */
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}
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#endif /* USE_FULL_ASSERT */
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