STM32 SysTick

C language:  Code#14620

/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Experimental platform: ST official three-in-one kit 
+ Hardware: STM32F103C8T6
+ Development platform: IAR For ARM 5.40
+ Emulator: J-Link
+ Date: 2010-10-26
+ Frequency: HSE = 8MHz, main frequency = 72MHz
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

#include "includes.h"

/*******************************************************************************
                             == Main function== 
***************************************************************************/
int main(void)
{ 
RCC_Configuration(); //Configure system clock 
NVIC_Configuration(); //Configure NVIC and Vector Table 
SysTick_Config(); //Configure SysTick's precise delay

GPIO_Configuration(); 


LED1_HIGH ; LED2_HIGH ; LED3_HIGH ; LED4_HIGH ; //Initialize and turn off all lights

//Main loop 
while (1)
{ 
    LED1_LOW ; 
    Delay_Ms(50);
    LED1_HIGH ; 
    Delay_Ms(50);
}
}

C language:  Code#14621

#include "includes.h"

/*******************************************************************************
                             == Global variables == 
**************************************************************************/
vu32 TimingDelay; // Precise delay counting variable used in SysTick interrupt

/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;

// Reset the peripheral RCC registers to the default values
​​RCC_DeInit();

// Set external high-speed crystal oscillator (HSE)
RCC_HSEConfig(RCC_HSE_ON);

// Wait for HSE to start 
HSEStartUpStatus = RCC_WaitForHSEStartUp();

if(HSEStartUpStatus == SUCCESS)
{
    //Enable prefetch buffer
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

     //Set code delay value
    //FLASH_Latency_2 2 delay period
    FLASH_SetLatency(FLASH_Latency_2);

    //Set AHB clock (HCLK)
    //RCC_SYSCLK_Div1 AHB clock = system clock 
    RCC_HCLKConfig(RCC_SYSCLK_Div1);

     //Set high speed AHB clock (PCLK2)
    //RCC_HCLK_Div2 APB1 clock = HCLK / 2 
    RCC_PCLK2Config(RCC_HCLK_Div2);

    //Set low speed AHB clock (PCLK1)
    //RCC_HCLK_Div2 APB1 clock = HCLK / 2 
    RCC_PCLK1Config(RCC_HCLK_Div2);

    //PLLCLK = 8MHz * 9 = 72 MHz 
    //Set PLL clock source and frequency multiplierRCC_PLLConfig
    (RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

    //Enable or disable PLL
    RCC_PLLCmd(ENABLE);

    //Wait for the specified RCC flag to be set successfullyWait for PLL initialization to be successfulwhile
    (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }


    //Set system clock (SYSCLK) Set PLL as system clock sourceRCC_SYSCLKConfig
    (RCC_SYSCLKSource_PLLCLK);

    //Wait for PLL to be successfully used as the clock source for system clock
    // 0x00: HSI as system clock 
    // 0x04: HSE as system clock 
    // 0x08: PLL as system clockwhile 
    (RCC_GetSYSCLKSource() != 0x08)
    {
    }
}

//RCC_APB2PeriphClockCmd(RCC_APB2Periph_ALL, ENABLE);


//Enable or disable APB2 peripheral clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);

}

/*******************************************************************************
* Function Name : SysTick_Config   SysTick设置
* Description    : Configures SysTick
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SysTick_Config(void)
{
    /* Disable SysTick Counter */
    SysTick_CounterCmd(SysTick_Counter_Disable);

    /* Disable the SysTick Interrupt */
    SysTick_ITConfig(DISABLE);

    /* Configure HCLK clock as SysTick clock source */
    SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);

    /* SysTick interrupt each 1000 Hz with HCLK equal to 72MHz */
    SysTick_SetReload(9000);

    /* Enable the SysTick Interrupt */
    SysTick_ITConfig(ENABLE);

}

/*******************************************************************************
* Function Name : NVIC_Configuration
* Description    : Configures NVIC and Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
}

/*******************************************************************************
* Function Name : GPIO_Configuration
* Description    : Configures the different GPIO ports.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure_LED_PORTB;
GPIO_InitTypeDef GPIO_InitStructure_KEY_PORTA;
GPIO_InitTypeDef GPIO_InitStructure_KEY_PORTB;
GPIO_InitTypeDef GPIO_InitStructure_KEY_PORTC;

//==== LED =======================================================
GPIO_InitStructure_LED_PORTB.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15 ;
GPIO_InitStructure_LED_PORTB.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure_LED_PORTB.GPIO_Mode = GPIO_Mode_Out_PP;   //推挽输出
GPIO_Init(GPIOB, &GPIO_InitStructure_LED_PORTB); 

//==== KEY =======================================================
GPIO_InitStructure_KEY_PORTA.GPIO_Pin = GPIO_Pin_0 ;
GPIO_InitStructure_KEY_PORTA.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure_KEY_PORTA.GPIO_Mode = GPIO_Mode_IPU ;     //上拉输入
GPIO_Init(GPIOA, &GPIO_InitStructure_KEY_PORTA); 

GPIO_InitStructure_KEY_PORTB.GPIO_Pin = GPIO_Pin_7 ;
GPIO_InitStructure_KEY_PORTB.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure_KEY_PORTB.GPIO_Mode = GPIO_Mode_IPU;      //上拉输入
GPIO_Init(GPIOB, &GPIO_InitStructure_KEY_PORTB); 

GPIO_InitStructure_KEY_PORTC.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15 ;
GPIO_InitStructure_KEY_PORTC.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure_KEY_PORTC.GPIO_Mode = GPIO_Mode_IPU;      //上拉输入
GPIO_Init(GPIOC, &GPIO_InitStructure_KEY_PORTC); 

}

/*******************************************************************************
* Function Name : 精确延时函数
*******************************************************************************/
void Delay_Ms(u32 nTime)
{
/* Enable the SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Enable);

TimingDelay = nTime;

while(TimingDelay != 0);

/* Disable SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Disable);
/* Clear SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Clear);
}

C language:  Code#14622

#ifndef INCLUDES
#define INCLUDES 1

//================================================================================
// ★★☆☆★★ Include files ★★☆☆★★                      
//================================================================================
#include "stm32f10x_lib.h"
#include "stm32f10x_type.h"
#include "stm32f10x_it.h"

//=====================================================================================
// ★★☆☆★★ Global variables ★★☆☆★★                      
//=
    ... The counting variable used for precise delay in SysTick interrupt

//====================================================================================
// ★★☆☆★★ Calling function ★★☆☆★★                      
//=
... Clock part#####################################################################
    void RCC_Configuration(void); //Configure system clock 

//###### System pulse part#####################################################################
    void SysTick_Config(void); //Configure system pulse timer

//###### Interrupt part####################################################################
    void NVIC_Configuration(void); //Configure NVIC and Vector Table 
    
//###### I/O part###################################################################
    void GPIO_Configuration(void); //Configure the GPIO port to be used
    
//###### Other common functions########################################################################
    void Delay_Ms(u32 nTime); //Precise millisecond delay
    
//=================================================================================
// ★★☆☆★★ IO port definition ★★☆☆★★                      
//===============================================================================
    #define LED1_HIGH ( GPIO_SetBits(GPIOB, GPIO_Pin_12) )
    #define LED2_HIGH ( GPIO_SetBits(GPIOB, GPIO_Pin_13) )
    #define LED3_HIGH ( GPIO_SetBits(GPIOB, GPIO_Pin_14) )
    #define LED4_HIGH ( GPIO_SetBits(GPIOB, GPIO_Pin_15) )
    
    #define LED1_LOW ( GPIO_ResetBits(GPIOB, GPIO_Pin_12) ) #define LED2_LOW
    ( GPIO_ResetBits(GPIOB , GPIO_Pin_13) )
    #define LED3_LOW ( GPIO_ResetBits(GPIOB, GPIO_Pin_14) )
    #define LED4_LOW ( GPIO_ResetBits(GPIOB, GPIO_Pin_15) )
    
    #define KEY_UP ( GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_14) )
    #define KEY_DOWN (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) )
    #define KEY_LEFT (GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_15) )
    #define KEY_RIGHT   ( GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_13) )
    #define KEY_SELECT ( GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_7) )   
    

#endif