stm32滴答SYSTICK中斷模式設(shè)置

ID:82781 · 發(fā)表于 2015-6-14 01:59

SYSTICK中斷模式！實(shí)驗(yàn)
這是MAIN文件

#include "main.h"
#include "myuse.h"
extern unsigned int count;
/*
全局變量在多文件中的定義方法，。h文件只是用來(lái)聲明變量和函數(shù)的，不是用來(lái)定義實(shí)體變量的
要在一個(gè).c文件和另一個(gè)。c文件中使用同一個(gè)變量，要在一個(gè).c文件中先定義入：uint a;然后再在
另一個(gè).c文件中用 extern uint a;定義一下，就OK樂(lè)，就是全局變量！！！！！而且是同一個(gè)變量！
，天津第四項(xiàng)目部宿舍
*/
/** @addtogroup STM32F10x_StdPeriph_Examples
* @{
*/
/** @addtogroup SysTick_TimeBase
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static __IO uint32_t TimingDelay;
/* Private function prototypes -----------------------------------------------*/
void Delay(__IO uint32_t nTime);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program.
* @param None
* @retval None
*/
GPIO_InitTypeDef GPIO_InitStructure;
void mysysint()//系統(tǒng)初始化程序
{
ErrorStatus HSEStartUpStatus;//說(shuō)明標(biāo)志位
RCC_DeInit();//所有外設(shè)全部缺省設(shè)置
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready and if Time out is reached exit */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)//啟動(dòng)成功
{
/*這兩條FLASH指令必須加上，不知為啥？不加上就運(yùn)行幾秒后出錯(cuò)，參照系統(tǒng)初始化*/
/* Enable The Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);//FLASH緩存開(kāi)啟
/* Configure the Latency cycle: Set 2 Latency cycles */
FLASH_SetLatency(FLASH_Latency_2); //設(shè)置FLASH這些位表示SYSCLK(系統(tǒng)時(shí)鐘)周期與閃存訪問(wèn)時(shí)間的比例,為010：兩個(gè)等待狀態(tài)，當(dāng) 48MHz < SYSCLK ≤ 72MHz
/* Set PLL clock output to 72MHz using HSE (8MHz) as entry clock */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);//外部時(shí)鐘為8M，PLL的輸入時(shí)鐘=8MHZ，倍頻系數(shù)9，
/* Configure HCLK such as HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);//設(shè)置了啦AHB分頻器的分頻系數(shù)=1，即HCLK=SYSCLK=72MHZ
/* Configure PCLK1 such as PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);//設(shè)置了APB1外設(shè)的時(shí)鐘頻率最大是36M這里是APB1的分頻器設(shè)為2,PCLK1=HCLK/2=72/2=36MHZ正好是最大值
/* Configure PCLK2 such as PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);//設(shè)置PLCK2=HCLK=72MHZ，的APB2分頻器=1
/* Select the PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);//設(shè)置了SYSCLK的提供者為PLL，頻率由上面算出=72MHZ
/* disable PLL Ready interrupt */
RCC_ITConfig(RCC_IT_PLLRDY, DISABLE);//PLL中斷關(guān)閉
/* disable PLL Ready interrupt */
RCC_ITConfig(RCC_IT_HSERDY,DISABLE);//HSE中斷關(guān)閉
/* disable PLL Ready interrupt */
RCC_ITConfig(RCC_IT_HSIRDY, DISABLE); //HSI中斷關(guān)閉
/* disable PLL Ready interrupt */
RCC_ITConfig(RCC_IT_LSERDY, DISABLE); //LSE中斷關(guān)閉
/* disable PLL Ready interrupt */
RCC_ITConfig(RCC_IT_LSIRDY, DISABLE); //LSI中斷關(guān)閉
/* PLL clock divided by 1.5 used as USB clock source */
RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);//設(shè)置USB的時(shí)鐘為=72、1.5=48mhz
/* Configure ADCCLK such as ADCCLK = PCLK2/2 */
RCC_ADCCLKConfig(RCC_PCLK2_Div2);//設(shè)置ADC時(shí)鐘=PCLK2/2= 36MHZ
/* disable the LSE */
RCC_LSEConfig(RCC_LSE_OFF);//外部低速晶振關(guān)閉
/*DISable the RTC clock */
RCC_RTCCLKCmd(DISABLE);
/* DISable the Clock Security System */
RCC_ClockSecuritySystemCmd(DISABLE);
/* Enable the PLL */
RCC_PLLCmd(ENABLE);//使能PLL
/* PLL ans system clock config */
}
else
{
/* Add here some code to deal with this error */
}
}
void mysystickint()
{
SysTick->LOAD=71999;//加載值=1ms
SCB->SHP[11]=15;//設(shè)置SYSTICK的優(yōu)先級(jí)為15，注意SYSTICK屬于系統(tǒng)異常，所以他的優(yōu)先級(jí)在SCB里設(shè)置。
SysTick->CTRL=7;//開(kāi)啟中斷，開(kāi)啟定時(shí)器，時(shí)鐘設(shè)置為HCLK=72mhz
}
int main(void)
{
mysysint();//系統(tǒng)初始化
/* GPIOD Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);//使能時(shí)鐘
/* Configure PD0 and PD2 in output pushpull mode */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9| GPIO_Pin_10| GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
mysystickint(); //w我設(shè)置的SYStick工作在中斷模式
while(1);
}

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stm32滴答SYSTICK中斷模式設(shè)置