setclock.c

基于stm32的16路AD采样程序

#include <stm32f10x_lib.h>              /* STM32F10x Library Definitions      */

void SetupClock (void)
{
  RCC_DeInit ();                        /* RCC system reset(for debug purpose)*/
  RCC_HSEConfig (RCC_HSE_ON);           /* Enable HSE                         */

  /* Wait till HSE is ready                                                   */
  while (RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET);

  RCC_HCLKConfig   (RCC_SYSCLK_Div1);   /* HCLK   = SYSCLK                    */
  RCC_PCLK2Config  (RCC_HCLK_Div1);     /* PCLK2  = HCLK                      */
  RCC_PCLK1Config  (RCC_HCLK_Div2);     /* PCLK1  = HCLK/2                    */
  RCC_ADCCLKConfig (RCC_PCLK2_Div4);    /* ADCCLK = PCLK2/4                   */

  *(vu32 *)0x40022000 = 0x01;           /* Flash 2 wait state                 */

  /* PLLCLK = 8MHz * 9 = 72 MHz                                               */
  RCC_PLLConfig (RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

  RCC_PLLCmd (ENABLE);                  /* Enable PLL                         */

  /* Wait till PLL is ready                                                   */
  while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET){};

  /* Select PLL as system clock source                                        */
  RCC_SYSCLKConfig (RCC_SYSCLKSource_PLLCLK);

  /* Wait till PLL is used as system clock source                             */
  while (RCC_GetSYSCLKSource() != 0x08){};

  /* Enable USART1 and GPIO ABC clock                                            */
  RCC_APB2PeriphClockCmd (RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA| RCC_APB2Periph_GPIOB| RCC_APB2Periph_GPIOC, ENABLE);

 
  /* SysTick event each 10 ms with input clock equal to 9MHz (HCLK/8)         */
  SysTick_SetReload(90000);	 //Sets SysTick Reload value

  SysTick_ITConfig(ENABLE);             /* Enable SysTick interrupt           */
  SysTick_CounterCmd(SysTick_Counter_Enable);//Enable SysTick counter
}