定时器主从方式输出可控个数的PWM脉冲

STM32定时器利用主从方式的门控模式输出可控个数的PWM脉冲

#include “stm32f10x.h“
#include “timer.h“

//==============================
//
//	配置中断向量表及优先级
//
//==============================
void NVIC_Config（void）
{
	NVIC_InitTypeDef NVIC_InitStructure;

#ifdef  VECT_TAB_RAM
  NVIC_SetVectorTable（NVIC_VectTab_RAM 0x0）;
#else  
  NVIC_SetVectorTable（NVIC_VectTab_FLASH 0x0）;
#endif


	NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;				
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init（&NVIC_InitStructure）;

}

void GPIO_Config（void）
{ 
    GPIO_InitTypeDef GPIO_InitStructure; 

	RCC_APB2PeriphClockCmd（RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO ENABLE）; 
	RCC_APB1PeriphClockCmd（RCC_APB1Periph_TIM2 | RCC_APB1Periph_TIM3 ENABLE）; 

    /* Timer2 Channel 1 PA0 */ 
    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_0; 
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
    GPIO_Init（GPIOA &GPIO_InitStructure）; 
} 



//================================================================================
void TIM2_Master__TIM3_Slave_Configuration（u32 PulseFrequency） 
{ 
	TIM_TimebaseInitTypeDef TIM_TimebaseStructure; 
	TIM_OCInitTypeDef TIM_OCInitStructure; 
	
	u16 nPDTemp ; 

	TIM_Cmd（TIM2 DISABLE）; 
	nPDTemp = 72000UL/PulseFrequency; 			   // 更改频率时，注意处理72000UL及TIM_Prescaler，使TIM_Period不要超过0xFFFF
	
	// 时基配置：配置PWM输出定时器——TIM2 
	/* Time base configuration */ 
	TIM_TimebaseStructure.TIM_Period = nPDTemp-1; 
	TIM_TimebaseStructure.TIM_Prescaler = 999; 
	TIM_TimebaseStructure.TIM_ClockDivision = 0; 
	TIM_TimebaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 
	TIM_TimebaseStructure.TIM_RepetitionCounter = 0; 
	TIM_TimebaseInit（TIM2 &TIM_TimebaseStructure）; 
	
	// 输出配置：配置PWM输出定时器——TIM2 
	/* PWM1 Mode configuration: Channel1 */    
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; 
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 
	TIM_OCInitStructure.TIM_Pulse = nPDTemp>>1;//50% 
	TIM_OC1Init（TIM2 &TIM_OCInitStructure）; 
	TIM_OC1PreloadConfig（TIM2 TIM_OCPreload_Enable）; 
	TIM_ARRPreloadConfig（TIM2 ENABLE）; 

	
	// 时基配置：配置脉冲计数寄存器——TIM3 
	TIM_TimebaseStructure.TIM_Period = 0xFFFF; 		     
	TIM_TimebaseStructure.TIM_Prescaler = 0; 
	TIM_TimebaseStructure.TIM_ClockDivision = 0; 
	TIM_TimebaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 
	TIM_TimebaseStructure.TIM_RepetitionCounter = 0; 
	TIM_TimebaseInit（TIM3 &TIM_TimebaseStructure）; 
	
	// Output Compare Active Mode configuration: Channel1 
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Inactive; 
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 
	TIM_OCInitStructure.TIM_Pulse = 0xFFFF; // 这里的配置值意义不大   
	TIM_OC1Init（TIM3 &TIM_OCInitStructure）; 
	

	// 配置TIM2为主定

 属性            大小     日期    时间   名称
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     文件     312692  2016-05-17 21:40  定时器主从方式输出可控个数的PWM脉冲\AllInOne.axf

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