原创 STM32 Hello World!

https://static.assets-stash.eet-china.com/album/old-resources/2008/12/12/8ee2aa15-a51b-441d-96f5-a15089fc5edf.rar

这个是STM32 HELLO WORLD! 程序，下载并解压后，里面有<<说明.PDF>>

文件，请看看！觉得经典的程序。完全不用STM32库！而且很简洁，简单。

非常适合STM32初学者学习.

http://bbs.embcom.net/forum-15-1.html

http://bbs.21ic.com/club/bbs/bbsView.asp?boardid=11

NETJOB @2008-12-12

下面是 初始化内设函数代码：

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// STM32的 外设初始化函数库
// netjob @2008-7-6
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

#include "stm32f103-s.h"
#include "lowlevelinit.h"

//=========================================================================
//
//=========================================================================
void delay()
{
int i,j;
j=0;
for (i=0; i<0xfffff; i++) j++;  // 1,048,575
}
//=========================================================================
//  LD1=LED4=PC7(PWM) LD2=LED4=PC6(PWM)  LD3=LED2=PC5  LD4=LED1=PC4
//=========================================================================
void Led_RW_ON(char index)
{
  switch(index)
  {
  case 0:
        STM32_Gpioc_Regs->bsrr.bit.BR7 =1;// 1：清除对应的ODRy位为0  关LD1
        STM32_Gpioc_Regs->bsrr.bit.BS7 =1;// 1：设置对应的ODRy位为1  开LD1
    break;
  case 1:
        STM32_Gpioc_Regs->bsrr.bit.BR6 =1;// 1：清除对应的ODRy位为0  关LD2
        STM32_Gpioc_Regs->bsrr.bit.BS6 =1;// 1：设置对应的ODRy位为1  开LD2
    break;
  case 2:
        STM32_Gpioc_Regs->bsrr.bit.BR5 =1;// 1：清除对应的ODRy位为0  关LD3
        STM32_Gpioc_Regs->bsrr.bit.BS5 =1;// 1：设置对应的ODRy位为1  开LD3
    break;
  case 3:
        STM32_Gpioc_Regs->bsrr.bit.BR4 =1;// 1：清除对应的ODRy位为0  关LD4
        STM32_Gpioc_Regs->bsrr.bit.BS4 =1;// 1：设置对应的ODRy位为1  开LD4
    break;
  }
}//end sub
//=========================================================================
//
//=========================================================================
void Led_RW_OFF(char index)
{
  switch(index)
  {
  case 0:
        STM32_Gpioc_Regs->bsrr.bit.BS7 =1;// 1：设置对应的ODRy位为1  开LD1
        STM32_Gpioc_Regs->bsrr.bit.BR7 =1;// 1：清除对应的ODRy位为0  关LD1
    break;
  case 1:
        STM32_Gpioc_Regs->bsrr.bit.BS6 =1;// 1：设置对应的ODRy位为1  开LD2
        STM32_Gpioc_Regs->bsrr.bit.BR6 =1;// 1：清除对应的ODRy位为0  关LD2
    break;
  case 2:
        STM32_Gpioc_Regs->bsrr.bit.BS5 =1;// 1：设置对应的ODRy位为1  开LD3
        STM32_Gpioc_Regs->bsrr.bit.BR5 =1;// 1：清除对应的ODRy位为0  关LD3
    break;
  case 3:
        STM32_Gpioc_Regs->bsrr.bit.BS4 =1;// 1：设置对应的ODRy位为1  开LD4
        STM32_Gpioc_Regs->bsrr.bit.BR4 =1;// 1：清除对应的ODRy位为0  关LD4
    break;
  }

}//end sub
//=========================================================================
//         RCC_Configuration(void)
//=========================================================================
void STM32_RCC_Configuration(void)
{
 /* Disable APB2 Peripheral Reset */
        STM32_Rcc_Regs->apb2rstr.all=0x00000000;
        /* Disable APB1 Peripheral Reset */
        STM32_Rcc_Regs->apb1rstr.all=0x00000000;
         /* FLITF and SRAM Clock ON */
        STM32_Rcc_Regs->ahbenr.all= 0x00000014;
        /* Disable APB2 Peripheral Clock */
        STM32_Rcc_Regs->apb2enr.all=0x00000000;
        /* Disable APB2 Peripheral Clock */
        STM32_Rcc_Regs->apb1enr.all=0x00000000;

        STM32_Rcc_Regs->cr.bit.HSION=1;  // HSI振荡器开启
      /* Reset SW[1:0], HPRE[3:0], PPRE1[2:0], PPRE2[2:0], ADCPRE[1:0] and MCO[2:0] bits*/
        STM32_Rcc_Regs->cfgr.all&= 0xF8FF0000;

      /* Reset HSEON, CSSON and PLLON bits */
        STM32_Rcc_Regs->cr.all&= 0xFEF6FFFF;

      /* Reset HSEBYP bit */
       STM32_Rcc_Regs->cr.all&= 0xFFFBFFFF;

      /* Reset PLLSRC, PLLXTPRE, PLLMUL[3:0] and USBPRE bits */
        STM32_Rcc_Regs->cfgr.all&= 0xFF80FFFF;
      /* Disable all interrupts */
        STM32_Rcc_Regs->cr.all= 0x00000000;

        STM32_Rcc_Regs->cr.bit.HSEON=0;  // HSE振荡器开启关闭
 STM32_Rcc_Regs->cr.bit.HSEBYP=0; // 外部高速时钟没有旁路
 STM32_Rcc_Regs->cr.bit.HSERDY=0; // 外部高速时钟就绪标志清零
  
 STM32_Rcc_Regs->cr.bit.HSEON=1;  // 外部高速时钟使能 1：HSE振荡器开启
 
  while( !(STM32_Rcc_Regs->cr.bit.HSERDY ) );//由硬件置1来指示外部时钟已经稳定。
  
  /* HCLK = SYSCLK＝72MHZ  :HLCK 提供给CPU, 内存和DMA 最大72MHZ  */
  STM32_Rcc_Regs->cfgr.bit.HPRE=RCC_AHB_SYSCLK_DIV1_B; //AHB预分频

 /* PCLK2 = HCLK/1=SYSCLK=72   PCLK2 提供给 APB2外设，最大72MHZ */
  STM32_Rcc_Regs->cfgr.bit.PPRE2=RCC_APB2_HCLK_DIV1_B; //高速APB预分频（APB2）
  
  /* PCLK1 = HCLK/2=SYSCLK/2=36   PCLK1提供给APB1外设，最大36MHZ */
  STM32_Rcc_Regs->cfgr.bit.PPRE1=RCC_APB1_HCLK_DIV2_B; //低速APB预分频（APB1）必须保证APB1时钟频率不超过36MHz

   /* ADCCLK = PCLK2/6     ADC转换速率：72M/6 = 12MHZ  */
  STM32_Rcc_Regs->cfgr.bit.ADCPRE=RCC_ADCPRE_PCLK2_DIV6_B; 
  
  /* Flash 2 wait state */
  STM32_Flash_Regs->ACR.all&=((u32)0x00000038); //清零某些位
  STM32_Flash_Regs->ACR.bit.LATENCY=2; 
 STM32_Flash_Regs->ACR.bit.PRFTBE=1;  //预取缓冲区使能 

 /*  PLLCLK = 8MHz * 9 = 72MHZ ) */
  STM32_Rcc_Regs->cfgr.bit.PLLXTPRE=0;     //HSE分频器作为PLL输入  0：HSE不分频
  STM32_Rcc_Regs->cfgr.bit.PLLSRC=1;     //HSE时钟作为PLL输入时钟
  STM32_Rcc_Regs->cfgr.bit.PLLMUL=RCC_PLL_9_B;     //PLL倍频系数9

 /* Enable PLL */
 STM32_Rcc_Regs->cr.bit.PLLON=1;   // PLL使能 
 while( !(STM32_Rcc_Regs->cr.bit.PLLRDY ) ); // PLL时钟就绪标志 PLL锁定后由硬件置1

  /* Select PLL as system clock source */
  STM32_Rcc_Regs->cfgr.bit.SW=0; 
  STM32_Rcc_Regs->cfgr.bit.SW=2;     //RCC_SW_SYSCLK_PLL

 /* Wait till PLL is used as system clock source */ 
  while(STM32_Rcc_Regs->cfgr.bit.SWS!=2);     //RCC_SWS_SYSCLK_PLL
   
 /* Enable GPIOA, GPIOB, GPIOC, GPIOD, GPIOE and AFIO clocks */
 STM32_Rcc_Regs->apb2enr.all |=(RCC_ADC1EN|RCC_AFIOEN|RCC_IOPAEN|RCC_IOPBEN|RCC_IOPCEN|RCC_IOPDEN|RCC_IOPEEN);
 
 /* TIM3 AND tim4 clocks enable */
  STM32_Rcc_Regs->apb1enr.all |=(RCC_TIM3EN| RCC_CANEN|RCC_TIM4EN);  
} //end sub
//=========================================================================
//         GPIO_Configuration(void)
//=========================================================================
void STM32_GPIO_Configuration(void)
{
 
   /* Configure PC.04 -- PC.11 as Output push-pull */
 // LED 灯
 STM32_Gpioc_Regs->crl.bit.CNF4=Output_push_pull;   // PC.04 推挽输出
 STM32_Gpioc_Regs->crl.bit.MODE4=Output_Mode_50mhz; // PC.04 输出模式，最大速度50MHz

 STM32_Gpioc_Regs->crl.bit.CNF5=Output_push_pull;   // PC.05 推挽输出
 STM32_Gpioc_Regs->crl.bit.MODE5=Output_Mode_50mhz; // PC.05 输出模式，最大速度50MHz

 STM32_Gpioc_Regs->crl.bit.CNF6=Output_push_pull;
 STM32_Gpioc_Regs->crl.bit.MODE6=Output_Mode_50mhz;

 STM32_Gpioc_Regs->crl.bit.CNF7=Output_push_pull;
 STM32_Gpioc_Regs->crl.bit.MODE7=Output_Mode_50mhz;
  
}//ENDSUB
//=========================================================================
//       Button_Config(void)
//  开发板上的4按键输入初始化
//=========================================================================
void STM32_Button_Config(void)
{
   /* Enable GPIOD clock */
 STM32_Rcc_Regs->apb2enr.bit.IOPDEN=1;//IOPDEN：IO口D时钟使能 
   /* Configure PD.03, PD.04 as output push-pull */
   // 注意了 这里是推挽输出 而实在是浮空输入!
  STM32_Gpiod_Regs->crl.bit.CNF3=Input_floating; // PD.03 浮空输入
 STM32_Gpiod_Regs->crl.bit.MODE3=Input_Mode; // PD.03 输入模式
  STM32_Gpiod_Regs->crl.bit.CNF4=Input_floating; // PD.04 浮空输入
 STM32_Gpiod_Regs->crl.bit.MODE4=Input_Mode; // PD.04 输入模式
}
//=========================================================================
//         NVIC_Configuration(void)
//=========================================================================
void STM32_NVIC_Configuration(void)
{
 
#ifdef  VECT_TAB_RAM
   /* Set the Vector Table base location at 0x20000000 */
   STM32_Scb_Regs->ExceptionTableOffset.all=0x20000000;
#else  /* VECT_TAB_FLASH  */
 /* Set the Vector Table base location at 0x08000000 */
   STM32_Scb_Regs->ExceptionTableOffset.all=0x08000000;
#endif

   /* Configure the Priority Group to 2 bits */
   STM32_Scb_Regs->AIRC.all= ((u32)0x05FA0000)|((u32)0x500);
  /* Configure the SysTick handler priority */
  STM32_Scb_Regs->SystemPriority[11].all=2;
}//end sub
//=========================================================================
//        STM32_Interrupt_Set(void)
//        开中断 定时器2中断
//=========================================================================
void STM32_Interrupt_Set(void)
{

 /* enabling interrupt  设置TIM2中断优先级，和开中断*/
 STM32_Nvic_Regs->Priority[28].all=0x80;
 STM32_Nvic_Regs->Enable[0].bit.INT28=1;   // 28 35 可设置 TIM2 TIM2全局中断 0x0000_00B0

}//END SUB

//=========================================================================
// TIM_Configuration(void)
//      设置TIMER-2定时器 为计数溢出中断，10毫秒中断一次
// TIM2、3、4的时钟源是 APB1 即是 PCLK1  ( APB1 对应 PCLK1 )
// PCLK1 = APB1 = HCLK/2 = SYSCLK/2 = 36MHZ (36,000,000 HZ)
//      但是倍频器会自动倍2， 又倍频回72MHZ.
//=========================================================================

void STM32_TIM2_Configuration(void)
{
 //  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
 //  TIM_OCInitTypeDef  TIM_OCInitStructure ;
   
        //  TIM_DeInit( TIM4);//复位TIM4定时器   
   STM32_Rcc_Regs->apb1rstr.all |=  RCC_TIM2RST;
   STM32_Rcc_Regs->apb1rstr.all &= ~RCC_TIM2RST;

        STM32_Rcc_Regs->apb1enr.all |=RCC_TIM2EN;  
         
   /* TIM2 configuration */
   //TIM_TimeBaseStructure.TIM_Period = 1000;    
   //TIM_TimeBaseStructure.TIM_Prescaler = 72;   
   //TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
   //TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
   //TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

 STM32_Tim2_Regs->arr.all=10000;  //  定时10毫秒 1MHZ/S 除 10,000 HZ
 STM32_Tim2_Regs->psc.all=72; //  72分频
 STM32_Tim2_Regs->cr1.bit.CKD=0; //  时钟分频因子
 STM32_Tim2_Regs->cr1.bit.DIR=0; //  0：计数器向上计数

   /* Clear TIM2 update pending flag[清除TIM2溢出中断标志] */
   //TIM_ClearFlag(TIM2, TIM_FLAG_Update);
 STM32_Tim2_Regs->sr.bit.UIF=0; //更新中断标记 由软件清0 ,例如当上溢或下溢时,软件对CNT重新初始化
    

   /* Enable TIM2 Update interrupt [TIM2溢出中断允许]*/
   //TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
   STM32_Tim2_Regs->dier.bit.UIE=1;// 允许更新中断
   
   /* TIM2 enable counter [允许tim2计数]*/
   //TIM_Cmd(TIM2, ENABLE);
   STM32_Tim2_Regs->cr1.bit.CEN=1;// 开启计数器

        STM32_Tim2_Regs->egr.bit.UG=1; //触发一次事件中断。
        STM32_Tim2_Regs->sr.bit.UIF=0;
   
} //end sub