system.c

这个是使用STM32单片机的定时器周期地产生中断的例子

#include "stm32f10x_lib.h"

#include "system.h"

ErrorStatus HSEStartUpStatus;
RCC_ClocksTypeDef RCC_ClockFreq;
//u16 CCR1_Val = 1;
u16 CCR1_Val = 1;
u16 CCR2_Val = 500;
u16 CCR3_Val = 250;
u16 CCR4_Val = 125;

//******************************************************************************
// Function Name  : RCC_Configuration
// Description    : Configures the different system clocks.
// Input          : None
// Output         : None
// Return         : None
//******************************************************************************
void RCC_Configuration(void)
{
	RCC_DeInit();					// RCC system reset(for debug purpose)
	RCC_HSEConfig(RCC_HSE_ON);		// Enable HSE
	HSEStartUpStatus = RCC_WaitForHSEStartUp();		// Wait till HSE is ready
	if(HSEStartUpStatus == SUCCESS) {
		FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);	// Enable Prefetch Buffer
		FLASH_SetLatency(FLASH_Latency_2);			// Flash 2 wait state
		RCC_HCLKConfig(RCC_SYSCLK_Div1);			// HCLK = SYSCLK
		RCC_PCLK2Config(RCC_HCLK_Div1);				// PCLK2 = HCLK
		RCC_PCLK1Config(RCC_HCLK_Div4);				// PCLK1 = HCLK/4
		RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);	// PLLCLK = 8MHz * 9 = 72 MHz
		RCC_PLLCmd(ENABLE);							// Enable PLL
		while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) {}	// Wait till PLL is ready
		RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);	// Select PLL as system clock source
		while(RCC_GetSYSCLKSource() != 0x08) {}		// Wait till PLL is used as system clock source
	}
//
	RCC_GetClocksFreq(&RCC_ClockFreq);		// This fills a RCC_ClocksTypeDef structure with the current frequencies.
	//  The RCC_ClockFreq members should be as following:
	//	RCC_ClockFreq.SYSCLK_Frequency = 72000000
	//	RCC_ClockFreq.HCLK_Frequency   = 72000000
	//	RCC_ClockFreq.PCLK1_Frequency  = 36000000
	//	RCC_ClockFreq.PCLK2_Frequency  = 72000000
	//	RCC_ClockFreq.ADCCLK_Frequency = 12000000
	RCC_ClockSecuritySystemCmd(ENABLE);		// Enable Clock Security System(CSS): this will generate an NMI exception when HSE clock fails

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);		// TIM2 clock enable
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC, ENABLE);		// GPIOA, C clock enable
//	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);  // GPIOC clock enable
}

//******************************************************************************
// Function Name  : MCO_Out_Configuration
// Description    : Output HSE clock on MCO pin
// Input          : - RCC_MCO_SET: specifies the clock source to output.
//						This parameter can be one of the following values:
//						- RCC_MCO_NoClock: No clock selected
//						- RCC_MCO_SYSCLK: System clock selected
//						- RCC_MCO_HSI: HSI oscillator clock selected
//						- RCC_MCO_HSE: HSE oscillator clock selected
//						- RCC_MCO_PLLCLK_Div2: PLL clock divided by 2 selected
// Output         : None
// Return         : None
//*******************************************************************************
void MCO_Out_Configuration(unsigned char RCC_MCO_SET)
{
	GPIO_InitTypeDef GPIO_InitStructure;

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);

//	RCC_MCOConfig(RCC_MCO_HSE);
	RCC_MCOConfig(RCC_MCO_SET);
}
//*******************************************************************************
// Function Name  : GPIO_Configuration
// Description    : Configure the GPIOD Pins.
// Input          : None
// Output         : None
// Return         : None
//*******************************************************************************
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;		// |GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOC, &GPIO_InitStructure);		// GPIOC Configuration: Pin6, 7, 8 and 9 in Output
}
//******************************************************************************
// Function Name  : GPIO_Configuration
// Description    : TIM2 Configuration: Output Compare Inactive Mode:
//					TIM2CLK = 36 MHz, Prescaler = 35999, TIM2 counter clock = 1 KHz
//					TIM2_CH1 delay = CCR1_Val/TIM2 counter clock  = 1000 ms
// Input          : None
// Output         : None
// Return         : None
//******************************************************************************
void TIM_Configuration(void)
{
	TIM_TimeBaseInitTypeDef		TIM_TimeBaseStructure;
	TIM_OCInitTypeDef			TIM_OCInitStructure;

	TIM_ARRPreloadConfig(TIM2, DISABLE);

	TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
	TIM_TimeBaseStructure.TIM_Prescaler = 0;
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);					// Time base configuration

	TIM_PrescalerConfig(TIM2, 35999, TIM_PSCReloadMode_Immediate);	// 进行36000(35999 + 1)分频

	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Inactive;
	TIM_OCInitStructure.TIM_Channel = TIM_Channel_1;
	TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OCInit(TIM2, &TIM_OCInitStructure);							// Output Compare Active Mode configuration: Channel1

	TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);

	TIM_ARRPreloadConfig(TIM2, ENABLE);
	TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);							// TIM IT enable
}
//******************************************************************************
// Function Name  : NVIC_Configuration
// Description    : Configure the nested vectored interrupt controller.
// Input          : None
// Output         : None
// Return         : None
//*****************************************************************************
void NVIC_Configuration(void)
{
	NVIC_InitTypeDef NVIC_InitStructure;

#ifdef  VECT_TAB_RAM 
	NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);					// Set the Vector Table base location at 0x20000000

#else  // VECT_TAB_FLASH
	NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);				// Set the Vector Table base location at 0x08000000
#endif

	NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;		// Enable the TIM2 Interrupt
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

	NVIC_Init(&NVIC_InitStructure);
}