请问怎么更改PWM的相位（库函数）

FireAllCP

[mw_shl_code=c,true]这是用输出比较的PWM  请问怎么才能让他输出不同相位的呢？ [/mw_shl_code] [mw_shl_code=c,true]#include "stm32f10x.h" //arr=3600 psc=0 u16 CCR1_Val=1800; u16 CCR2_Val=900; u16 CCR3_Val=450; void TIM1_PWM_Init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; 配置时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能定时器2时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); 配置gpio口 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2; //PWM A0 A1 A2 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA,&GPIO_InitStructure); 定时器基本配置 TIM_TimeBaseStructure.TIM_Period = arr; TIM_TimeBaseStructure.TIM_Prescaler =psc; TIM_TimeBaseStructure.TIM_ClockDivision =TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_RepetitionCounter=0; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); pwm输出配置，TIM_OCInitStructure共七项配置 TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2; TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_Low; TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable; //通道1 TIM_OCInitStructure.TIM_Pulse=CCR1_Val; TIM_OC1Init(TIM2,&TIM_OCInitStructure); //通道2 TIM_OCInitStructure.TIM_Pulse=CCR2_Val; TIM_OC2Init(TIM2,&TIM_OCInitStructure); //通道3 TIM_OCInitStructure.TIM_Pulse=CCR3_Val; TIM_OC3Init(TIM2,&TIM_OCInitStructure); 使能端的打开 TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable); TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable); TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable); TIM_ARRPreloadConfig(TIM2,ENABLE); TIM_Cmd(TIM2,ENABLE); } [/mw_shl_code]

正点原子

论坛搜索:输出比较

FireAllCP

回复【2楼】正点原子:
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我调出来了 ，将您打的那个寄存器版部分改成了库函数版（有些真不知道怎么改了），但是改完后才发现，怎么只用到了void TIM2_CMP_Init(u16 arr,u16 psc) 这一个函数呢，我把上面的void TIM3_PWM_Init(u16 arr,u16 psc) 和void TIM2_Int_Init(u16 arr,u16 psc)屏蔽掉了依然能输出怎么回事呢？

下面这个就是那最后一个函数，还不知道怎么改变占空比

[mw_shl_code=c,true]void TIM2_CMP_Init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE); / RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2; //PWM A0 A1 A2 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA,&GPIO_InitStructure); TIM2->ARR=arr; TIM2->SC=psc; TIM2->CCMR1|=1<<3; //CH1预装载使能 TIM2->CCMR1|=3<<4; //CH1匹配时翻转     TIM2->CCMR1|=1<<11; TIM2->CCMR1|=3<<12; TIM2->CCMR2|=1<<3; TIM2->CCMR2|=3<<4; TIM2->CCER|=1<<0; TIM2->CCER|=1<<4; TIM2->CCER|=1<<8; TIM2->CR1=0x0080; TIM2->CR1|=0x01; } [/mw_shl_code]

请大哥您给我说下这改变相位的原理吧