stm32如何产生pwm波（stm32产生pwm波的原理）
如何使用STM32定时器产生SPWM波，滤波可以产生正弦波
tim_channel 的输出引脚可以生成pwm。如果要生成spwm，还是需要一个算法来实现。首先需要将sin正弦值存入stm32中，然后在固定定时器中断中读出并与pwm比较，生成spwm波形。
stm32如何使用定时器产生多个pwm波
例如stm32的TIM4口有4个比较输出口。设置比较定时器缓冲区，并设置重计数值和占空比。同时必须允许信号输出，然后4个通道才会有PWM波发出。看下面的例子：
http://www.sychzs.cn/jishu_357019_1_1.html
如何让stm32产生多输出PWM。最好有代码
我自己用的24行无法粘贴，所以就只贴前两行，其他的就照样写吧。
#include "pwm.h"
void Timer1PwmInit(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
// RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,启用;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed= GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_ 周期 = PWM_PERIOD ;//
TIM_TimeBaseStructure.TIM_Prescaler = PRECALERS;//
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0000;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_输出状态= TIM_OutputState_Disable; //仅输出互补
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;//CCR
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low ;
TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCNPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC3Init (TIM1, &TIM_OCInitStructure);//CH3N PB15
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM1, DISABLE); //预载寄存器的内容立即传输到影子寄存器
//TIM_ARRPreloadConfig(TIM1, ENABLE);
TIM_Cmd(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);
}
//void SetLED5_W(u16 val)
//{
// TIM1->CCR1 = val; / /}
//void SetLED5_B(u16 val)
//{
// TIM1->CCR2 = val;
//}
//void SetLED5_G(u16 val) //{
// TIM1->CCR3 = val;
//}
//void SetLED5_R(u16 val)
//{
// TIM1->CCR4 = val ;
//}
void SetPwm4(u16 val)
{
TIM1->CCR3 = val;
}
//void Timer2PwmInit(void)
// {
// GPIO_InitTypeDef GPIO_InitStructure;
// TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
// TIM_OCInitTypeDef TIM_OCInitStructure;
// // RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA| RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO，启用）； //使能GPIO外设和AFIO复用功能模块时钟
// AFIO->MAPR&=0XF8FFFFFF;
// AFIO->MAPR|=0X04000000;
/ /
// GPIO_PinRemapConfig(GPIO_FullRemap_TIM2, ENABLE); //Timer2 完全重映射
//
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15；
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
//GPIO_Init(GPIOA, &GPIO_InitS结构体);//初始化GPIO
//
// GPIO_InitS结构体.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_10|GPIO_Pin_11;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
//GPIO_Init Structure.GPIO_Speed = GPIO_Speed_50MHz;
//GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化GPIO
//
// //初始化TIM2
// TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD;
// TIM_TimeBase Structure.TIM_Prescaler =PRECALERS;
// TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分频：TDTS = Tck_tim
// TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
// TIM_TimeBaseInit(TIM2, &TIM_TimeBase Structure);
// // // //初始化TIM2通道PWM模式
// tim_ocinitstructure.tim_ocmode = tim_ocmode_pwm1;
// tim_ocinitstructure.tim_outputstate = tim_outputstate = tim_outputstate_enable; //比较输出使能
// TIM_OCInitStructure.TIM_Pulse = 0;//TIM->CCR = 0
// TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
//
//
// TIM_OC1Init(TI M2, &TIM_OCInitStructure);
//TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable); //使能CCR1上TIM2的预载寄存器
//
// TIM_OC2Init(TIM2, &TIM_OCInitStructure);
// TIM_OC2PreloadConfig( TIM2, TIM_OCPreload_Enable) ;
//
//TIM_OC3Init (TIM2, &TIM_OCInitStructure);
// TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);
//
// T IM_OC4Init(TIM2, &TIM_OCInitStructure);
// TIM _OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);
//
// TIM_ARRPreloadConfig(TIM2, ENABLE);
// TIM_Cmd(TIM2, ENABLE); //启用TIM2
//}
//void SetLED2_R(u16 val)
//{
// TIM2->CCR4 = val;
//}
// void setled2_g（u16 val）
// {
// tim2-> ccr3 = val;
//}
// void setled2_b（u16 val）
// // TIM2->CCR2 = val;
//}
//void SetLED2_W(u16 val)
//{
// TIM2->CCR1 = val;
//}
如何用stm32产生PWM输出？
voidTimer4PwmInit(void)
{
GPIO_InitTypeDefGPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO,启用); //
启用 GPIO 外设和 AFIO 复用功能模块时钟
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; //多路推挽输出
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);//初始化GPIO
//初始化TIM4
TIM_TimeBaseStructure.TIM_Period=PWM_PERIOD;
TIM_TimeBaseStructure.TIM_Prescaler=预校准器；
TIM_TimeBaseStructure.TIM_ClockDivision=0;//设置时钟分频：TDTS=Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure);
//初始化TIM4ChannelPWM模式
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;//比较输出使能
TIM_OCInitStructure.TIM_Pulse=0;//TIM->CCR=0
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High；
TIM_OC1Init(TIM4,&TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM4,TIM_OCPreload_Enable); //使能CCR1上TIM4的预载寄存器
TIM_OC2Init(TIM4,&TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM4,TIM_OCPreload_Enable);
TIM_OC3Init(TIM4,&TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM4,TIM_OCPreload_Enable);
TIM_OC4Init(TIM4,&TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM4,TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM4,ENABLE);
TIM_Cmd(TIM4,ENABLE); //启用TIM4
}
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