setclock.c

通过can总线接收9路AD采样并通过串口上传值PC机

#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);

  /* Enable Prefetch Buffer */
  FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

  /* Flash 2 wait state */
  FLASH_SetLatency(FLASH_Latency_2);

  /* HCLK = SYSCLK */
  RCC_HCLKConfig(RCC_SYSCLK_Div1);/****************** HCLK 72 MHz ************************************/

  /* PCLK2 = HCLK */
  RCC_PCLK2Config(RCC_HCLK_Div1);/****************** PCLK2 72 MHz ************************************/

  /* PCLK1 = HCLK/2 */
  RCC_PCLK1Config(RCC_HCLK_Div2);/****************** PCLK1 36 MHz ************************************/

  //*(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){};

  //外设使能时钟
  //使能需要使用到的所有端口的时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 |RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO , ENABLE);
  /* Enable DMA clock*/
 // RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA, ENABLE);
  /* CAN Periph clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN, ENABLE);
 }