pwm的应用

study

#include "pwm.h"
#include "stm32f10x.h"
void pwm_configuration(void)
{
 GPIO_InitTypeDef GPIO_InitStructure;
 
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
 
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
 GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void timer3_configuration(void)
{
 TIM_OCInitTypeDef TIM_OCInitStructure;
 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
 
 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
 
 TIM_TimeBaseStructure.TIM_Period = 1200;
 TIM_TimeBaseStructure.TIM_Prescaler = 0;
 TIM_TimeBaseStructure.TIM_ClockDivision =0;
 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
 TIM_TimeBaseInit(TIM3, & TIM_TimeBaseStructure);
 
 
 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
 TIM_OCInitStructure.TIM_Pulse = 600;
 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
 TIM_OC2Init(TIM3, & TIM_OCInitStructure);
 
 TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
 TIM_ARRPreloadConfig(TIM3, ENABLE);
 TIM_Cmd(TIM3, ENABLE);
}
void gpio_configuration(void)
{
 GPIO_InitTypeDef GPIO_InitStructure;
 
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
 GPIO_Init(GPIOA, &GPIO_InitStructure);
}
原子哥  这是我pwm的配置   不知道咋回事下载到开发板后灯亮一下就给灭啦 

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