STM32F407ZG HAL库配置过程 时钟系统

void SystemInit(void)

{

 /* FPU settings ------------------------------------------------------------*/

 #if (__FPU_PRESENT == 1) && (__FPU_USED == 1)

    SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2)); /* set CP10 and CP11 Full Access */

 #endif

 /* Reset the RCC clock configuration to the default reset state ------------*/

 /* Set HSION bit */

 RCC->CR |= (uint32_t)0x00000001;

 /* Reset CFGR register */

 RCC->CFGR = 0x00000000;

 /* Reset HSEON, CSSON and PLLON bits */

 RCC->CR &= (uint32_t)0xFEF6FFFF;

 /* Reset PLLCFGR register */

 RCC->PLLCFGR = 0x24003010;

 /* Reset HSEBYP bit */

 RCC->CR &= (uint32_t)0xFFFBFFFF;

 /* Disable all interrupts */

 RCC->CIR = 0x00000000;

#if defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)

 SystemInit_ExtMemCtl(); 

#endif /* DATA_IN_ExtSRAM || DATA_IN_ExtSDRAM */

 /* Configure the Vector Table location add offset address ------------------*/

#ifdef VECT_TAB_SRAM

 SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal 

SRAM */

#else

 SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in 

Internal FLASH */

#endif

}

void Clock_Init(uint32_t plln, uint32_t pllm, uint32_t pllp, uint32_t pllq)

{

    HAL_StatusTypeDef ret = HAL_OK;

    RCC_OscInitTypeDef RCC_OscConfig;

    RCC_ClkInitTypeDef RCC_ClkConfig;

    

    __HAL_RCC_PWR_CLK_ENABLE();  // Enable clock of power

    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

    RCC_OscConfig.OscillatorType = RCC_OSCILLATORTYPE_HSE;  // Set HSE as clock source

    RCC_OscConfig.HSEState = RCC_HSE_ON;  // Enable HSE

    RCC_OscConfig.PLL.PLLState = RCC_PLL_ON;  // Enable PLL

    RCC_OscConfig.PLL.PLLSource = RCC_PLLSOURCE_HSE;  // Set HSE as source of PLL

    RCC_OscConfig.PLL.PLLM = pllm;  // Set M as pllm, which in range 2 to 63

    RCC_OscConfig.PLL.PLLN = plln;  // Set N as plln, which in range 64 to 432

    RCC_OscConfig.PLL.PLLP = pllp;  // Set P as pllp, which in 2, 4, 6 and 8

    RCC_OscConfig.PLL.PLLQ = pllq;  // Set Q as pllq, which in range 2 to 15

    ret = HAL_RCC_OscConfig(&RCC_OscConfig);  // Config RCC

    if(ret != HAL_OK) while(1);  // Error

    // Config PLL as system clock source and config HCLK, PCLK1 and PCLK2

    RCC_ClkConfig.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);

    RCC_ClkConfig.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;  // Config PLL as system clock source

    RCC_ClkConfig.AHBCLKDivider = RCC_SYSCLK_DIV1;  // AHB Divider 1

    RCC_ClkConfig.APB1CLKDivider = RCC_HCLK_DIV4;  // APB1 Divider 4

    RCC_ClkCOnfig.APB2CLKDivider = RCC_HCLK_DIV2;  // APB2 Divider 2

    ret=HAL_RCC_ClockConfig(&RCC_ClkInitStructure,FLASH_LATENCY_5);  // Config RCC Clock

        if(ret != HAL_OK) while(1);  // Error

    //  STM32F405x/407x/415x/417x Z 版本的器件支持预取功能

    if (HAL_GetREVID() == 0x1001)

        {

                __HAL_FLASH_PREFETCH_BUFFER_ENABLE(); //使能 flash 预取

        }

}

typedef struct

{

 uint32_t OscillatorType; //需要选择配置的振荡器类型

 uint32_t HSEState; //HSE 状态

 uint32_t LSEState; //LSE 状态

 uint32_t HSIState; //HIS 状态

 uint32_t HSICalibrationValue; //HIS 校准值

 uint32_t LSIState; //LSI 状态 

 RCC_PLLInitTypeDef PLL; //PLL 配置

}RCC_OscInitTypeDef;

typedef struct

{

    uint32_t PLLState; //PLL 状态

         uint32_t PLLSource; //PLL 时钟源

        uint32_t PLLM; //PLL 分频系数 M

         uint32_t PLLN; //PLL 倍频系数 N

         uint32_t PLLP; //PLL 分频系数 P

         uint32_t PLLQ; //PLL 分频系数 Q

}RCC_PLLInitTypeDef;