stm32 高级定时器产生PWM

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用stm32的高级定时器TIM1和TIM8产生PWM，需要注意：

1.都有TIM1，但只有flash容量大于256K的大容量单片机才有TIM8

2.高级定时器相对于通用定时器，多了TIM_CtrlPWMOutputs(TIM8, ENABLE);

TIM1产生四路PWM程序：

static void TIM1_GPIO_Config(void){        GPIO_InitTypeDef GPIO_InitStructure;        RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);         RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);           GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8 | GPIO_Pin_9| GPIO_Pin_10 | GPIO_Pin_11;         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_InitStructure);  }static void TIM1_Mode_Config(void){              TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;              TIM_OCInitTypeDef  TIM_OCInitStructure;             u16 CCR1_Val = 500;                      u16 CCR2_Val = 500;             u16 CCR3_Val = 500;              u16 CCR4_Val = 500;        TIM_TimeBaseStructure.TIM_Period = 999;       //当定时器从0计数到999，即为1000次，为一个定时周期       TIM_TimeBaseStructure.TIM_Prescaler = 71;                  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;        //设置时钟分频系数：不分频                TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //向上计数模式       TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);                        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;            //配置为PWM模式1        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;                   // TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;              TIM_OCInitStructure.TIM_Pulse = CCR1_Val;           //设置跳变值，当计数器计数到这个值时，电平发生跳变      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  //当定时器计数值小于CCR1_Val时为高电平       TIM_OC1Init(TIM1, &TIM_OCInitStructure);         //使能通道1       TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;       TIM_OCInitStructure.TIM_Pulse = CCR2_Val;          //设置通道2的电平跳变值，输出另外一个占空比的PWM       TIM_OC2Init(TIM1, &TIM_OCInitStructure);          //使能通道2     TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);              TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;       TIM_OCInitStructure.TIM_Pulse = CCR3_Val;        //设置通道3的电平跳变值，输出另外一个占空比的PWM       TIM_OC3Init(TIM1, &TIM_OCInitStructure);         //使能通道3       TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;     TIM_OCInitStructure.TIM_Pulse = CCR4_Val;        //设置通道4的电平跳变值，输出另外一个占空比的PWM      TIM_OC4Init(TIM1, &TIM_OCInitStructure);        //使能通道4     TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);      TIM_ARRPreloadConfig(TIM1, ENABLE);                         // 使能TIM1重载寄存器ARR    TIM_CtrlPWMOutputs(TIM1, ENABLE); TIM_Cmd(TIM1, ENABLE);  } void TIM1_PWM_Init(void){            TIM1_GPIO_Config();          TIM1_Mode_Config();      }

TIM8产生2路PWM程序：

static void TIM8_GPIO_Config(void){        GPIO_InitTypeDef GPIO_InitStructure;        RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);         RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);     GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_7|GPIO_Pin_9;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    // 复用推挽输出  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_Init(GPIOC, &GPIO_InitStructure);  }static void TIM8_Mode_Config(void){              TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;              TIM_OCInitTypeDef  TIM_OCInitStructure;             u16 CCR1_Val = 500;                      u16 CCR2_Val = 500;             u16 CCR3_Val = 500;              u16 CCR4_Val = 500;        TIM_TimeBaseStructure.TIM_Period = 999;       //当定时器从0计数到999，即为1000次，为一个定时周期       TIM_TimeBaseStructure.TIM_Prescaler = 71;                  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;        //设置时钟分频系数：不分频                TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //向上计数模式       TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);                        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;            //配置为PWM模式1        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;                   // TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;              TIM_OCInitStructure.TIM_Pulse = CCR1_Val;           //设置跳变值，当计数器计数到这个值时，电平发生跳变      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  //当定时器计数值小于CCR1_Val时为高电平       TIM_OC1Init(TIM8, &TIM_OCInitStructure);         //使能通道1       TIM_OC1PreloadConfig(TIM8, TIM_OCPreload_Enable);      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;       TIM_OCInitStructure.TIM_Pulse = CCR2_Val;          //设置通道2的电平跳变值，输出另外一个占空比的PWM       TIM_OC2Init(TIM8, &TIM_OCInitStructure);          //使能通道2     TIM_OC2PreloadConfig(TIM8, TIM_OCPreload_Enable);              TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;       TIM_OCInitStructure.TIM_Pulse = CCR3_Val;        //设置通道3的电平跳变值，输出另外一个占空比的PWM       TIM_OC3Init(TIM8, &TIM_OCInitStructure);         //使能通道3       TIM_OC3PreloadConfig(TIM8, TIM_OCPreload_Enable);        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;     TIM_OCInitStructure.TIM_Pulse = CCR4_Val;        //设置通道4的电平跳变值，输出另外一个占空比的PWM      TIM_OC4Init(TIM8, &TIM_OCInitStructure);        //使能通道4     TIM_OC4PreloadConfig(TIM8, TIM_OCPreload_Enable);      TIM_ARRPreloadConfig(TIM8, ENABLE);                         // 使能TIM8重载寄存器ARR    TIM_CtrlPWMOutputs(TIM8, ENABLE); TIM_Cmd(TIM8, ENABLE);  } void TIM8_PWM_Init(void){            TIM8_GPIO_Config();          TIM8_Mode_Config();      }

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