RCC_AHBPeriphClockCmd();//AHB线上外设时钟使能 5.其他外设时钟配置: RCC_ADCCLKConfig();RCC_RTCCLKConfig(); 6.状态参数获取参数: RCC_GetClocksFreq(); RCC_GetSYSCLKSource(); RCC_GetFlagStatus() 7.RCC中断相关函数: RCC_ITConfig()、RCC_GetITStatus()、RCC_ClearITPendingBit()… 六、SystemInit函...
< System Clock Frequency (Core Clock) */ #else /*!< HSI Selected as System Clock source */ uint32_t SystemCoreClock = HSI_VALUE; /*!< System Clock Frequency (Core Clock) 如果没有定义外部高速时钟则用内部高速时钟,为8000000*/ #endif __I uint8_t AHBPrescTable[16] = {0, 0, 0, 0...
你可以自行更新SystemCoreClock, 因为它就是定义在system_stm32f4xx.c里的一个全局变量 也可以使用SystemCoreClockUpdate()来进行更新，如下是system_stm32f4xx.c里的注释 - SystemCoreClock variable: Contains the core clock (HCLK), it can be used by the user application to setup the SysTick ti...
< System Clock Frequency (Core Clock)*/#elifdefined SYSCLK_FREQ_24MHzuint32_t SystemCoreClock= SYSCLK_FREQ_24MHz;/*!< System Clock Frequency (Core Clock)*/#elifdefined SYSCLK_FREQ_36MHzuint32_t SystemCoreClock= SYSCLK_FREQ_36MHz;/*!< System Clock Frequency (Core Clock)*/#elifdefined SY...
< HSI Selected as System Clock source */ uint32_t SystemCoreClock = HSI_VALUE;/*!< System Clock Frequency (Core Clock) 如果没有定义外部高速时钟则用内部高速时钟,为8000000*/ #endif __I uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9}...
在工程的sys.c文件中我们编写时钟设置函数sys_stm32_clock_init,该函数通过配置PLL3相关参数实现用户时钟系统配置,函数中我们也添加了MPU时钟设置的相关代码,代码中已经附上了详细的注释,如下: #include "./SYSTEM/sys/sys.h" /** * @brief M4主频时钟设置函数,也就是设置PLL3 * @param plln: PLL3倍频...
< HSI Selected as System Clock source */ uint32_t SystemCoreClock = HSI_VALUE; /*!< System Clock Frequency (Core Clock) 如果没有定义外部高速时钟则用内部高速时钟,为8000000*/ #endif __I uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9...
< System Clock Frequency (Core Clock)*/#elifdefined SYSCLK_FREQ_72MHzuint32_t SystemCoreClock= SYSCLK_FREQ_72MHz;/*!< System Clock Frequency (Core Clock)*/#else/*!< HSI Selected as System Clock source */uint32_t SystemCoreClock= HSI_VALUE;/*!< System Clock Frequency (Core Clock)*/...
在system_stm32f4xx.c文件中定义了全局变量uint32_t SystemCoreClock=180000000,并在头文件system_stm32f4xx.c->stm32f4xx.h中声明。 1-配置SysTick 按照1ms进行分片,配置程序如下: 登录后复制SysTick_Config(SystemCoreClock/1000); 这样,SysTick会每1ms产生一次异常请求。全局变量定义: ...
Debug方面的设置,在System Core分类下外设SYS中的debug选项设置为`Serial Wire`,即ST-LINK通信方式 打开串口USART2粗略地查看调试信息,可采用阻塞发送 设置外设TIM2 `Mode`中下`Clock Source`选择`Internal Clock` 从模式设置为`Reset Mode`,触发器源设置为`TI1FP1` ...