通用定时器TIM2——单独控制三路PWM输出

主函数

#include "BSP_TIM2.h"   
#include "BSP_GPIO.h"



int main(void)
{
	TIM2_Init();
  KEY_GPIO_Config();
	while(1)
	{
		// ON
		if(KEY_Scan(KEY_PORT, KEY_ON_PIN) == 1)
		{
			TIM2->CCR2 = CCR_Val;
			Delay_ms(2000);     //2s
//			TIM2->CCR2 = 0;
		}
			
		// OFF
	  if(KEY_Scan(KEY_PORT, KEY_OFF_PIN) == 1)
		{
//			TIM2->CCR2 = 0;
//			TIM2->CCR4 = 0;
			TIM2->CCR3 = CCR_Val;
			Delay_ms(2000);     //1s
//			TIM2->CCR3 = 0;
		}
		
		// RESET
		if(KEY_Scan(KEY_PORT, KEY_RESET_PIN) == 1)
		{
//			TIM2->CCR2 = 0;
//			TIM2->CCR3 = 0;
			TIM2->CCR4 = CCR_Val;
			Delay_ms(2000);     //1s
//			TIM2->CCR4 = 0;
		}
	}
}

GPIO.C

#include "BSP_GPIO.h"

void KEY_GPIO_Config(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	
	RCC_APB2PeriphClockCmd(KEY_CLK,ENABLE);
	
	GPIO_InitStructure.GPIO_Pin = KEY_ON_PIN;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
	GPIO_Init(KEY_PORT,&GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Pin = KEY_OFF_PIN;
	GPIO_Init(KEY_PORT,&GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Pin = KEY_RESET_PIN;
	GPIO_Init(KEY_PORT,&GPIO_InitStructure);
}

uint8_t KEY_Scan(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin)
{
	if(GPIO_ReadInputDataBit(GPIOx, GPIO_Pin) == 1)
	{
//		while(GPIO_ReadInputDataBit(GPIOx, GPIO_Pin) == 1);
		return 1;
	}
	else
		return 0;
}

GPIO.H

#ifndef __BSP_GPIO_H
#define __BSP_GPIO_H

#include "stm32f10x.h"

#define KEY_CLK         RCC_APB2Periph_GPIOB
#define KEY_PORT     GPIOB

#define KEY_ON_PIN      GPIO_Pin_11
#define KEY_OFF_PIN     GPIO_Pin_12
#define KEY_RESET_PIN   GPIO_Pin_13


void KEY_GPIO_Config(void);
uint8_t KEY_Scan(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin);

#endif

TIM2.C

#include "BSP_TIM2.h"

void Delay_us(uint32_t Tim)
{
	uint32_t i=0; 
	for(i=0;i<Tim;i++)
	{  
			__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();  
			__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();  
			__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();  
			__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();  
			__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();  
	}  
}

void Delay_ms(uint32_t Tim)
{
	uint32_t i;
	for(i=0;i<Tim;i++)
		Delay_us(1000);
}

static void TIM2_GPIO_Config(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	
	RCC_APB2PeriphClockCmd(TIM2_GPIO_CLK, ENABLE);
	
	GPIO_InitStructure.GPIO_Pin = TIM2_GPIO_PIN1;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(TIM2_GPIO_PORT, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Pin = TIM2_GPIO_PIN2;
	GPIO_Init(TIM2_GPIO_PORT, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Pin = TIM2_GPIO_PIN3;
	GPIO_Init(TIM2_GPIO_PORT, &GPIO_InitStructure);
}

static void TIM2_MODE_Config(void)
{
	TIM_TimeBaseInitTypeDef TIM_TimBaseStructure;
	TIM_OCInitTypeDef TIM_OCInitStructure;
	
	RCC_APB1PeriphClockCmd(TIM2_CLK, ENABLE);
	
	TIM_TimBaseStructure.TIM_Period = TIM2_Period;
	TIM_TimBaseStructure.TIM_Prescaler = TIM2_Prescaler;
	TIM_TimBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimBaseStructure.TIM_RepetitionCounter = 0;
	TIM_TimeBaseInit(TIM2, &TIM_TimBaseStructure);
	
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OCInitStructure.TIM_Pulse = 0;
	
	TIM_OC2Init(TIM2, &TIM_OCInitStructure);
	TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
	
	TIM_OC3Init(TIM2, &TIM_OCInitStructure);
	TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);
	
	TIM_OC4Init(TIM2, &TIM_OCInitStructure);
	TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);
	
	TIM_ClearFlag(TIM2, TIM_FLAG_Update);
	TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
	
	TIM_Cmd(TIM2, ENABLE);
	
}

static void TIM2_NVIC_Config(void)
{
	NVIC_InitTypeDef NVIC_InitStructure;
	
	NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	
	NVIC_Init(&NVIC_InitStructure);
}

void TIM2_Init(void)
{
	TIM2_NVIC_Config();
	TIM2_GPIO_Config();
	TIM2_MODE_Config();
}

TIM2.H

#ifndef __BSP_TIM2_H
#define __BSP_TIM2_H

#include "stm32f10x.h"

#define   TIM2_Period         399   // 200ms(399)
#define   TIM2_Prescaler      35999 // 2KHz
#define   CCR_Val             320   // 
#define   TIM2_CLK            RCC_APB1Periph_TIM2

#define   TIM2_GPIO_PORT      GPIOA
#define   TIM2_GPIO_CLK       RCC_APB2Periph_GPIOA

#define   TIM2_GPIO_PIN1      GPIO_Pin_1
#define   TIM2_GPIO_PIN2      GPIO_Pin_2
#define   TIM2_GPIO_PIN3      GPIO_Pin_3

void Delay_us(uint32_t Tim);
void Delay_ms(uint32_t Tim);

void TIM2_Init(void);

#endif

中断函数

void TIM2_IRQHandler(void)
{
	if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
	{
		TIM2->CCR2 = 0;
		TIM2->CCR3 = 0;
		TIM2->CCR4 = 0;
		TIM_ClearITPendingBit(TIM2, TIM_FLAG_Update);
	}
//	TIM_Cmd(TIM2, DISABLE);
//	Delay_ms(1000);
}

该程序实现的是按键控制TIM2通道2，3，4输出PWM波，每按一次，输出一个脉冲。把与中断相关的去掉，可实现按键按的时候一直输出脉冲。

现在遗留的问题是，没办法检测到按键弹开。