stm32f051产生可调占空比的pwm波

/**********************************

* [url=home.php?mod=space&uid=247401]@brief[/url] TIM_PWM_Config

* @param None

* @retval 配置pwm 参数

**********************************/

void TIM1_PWM_Config(void)

{

NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel=TIM1_CC_IRQn; NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init(&NVIC_InitStructure); 



//预定标的值TIM1_Period = (time定时器频率 / pwm的频率) - 1

TimerPeriod = (SystemCoreClock / 50000 ) - 1;

//Channel1Pulse的值可以按照下面的公式进行计算：

//ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100

//DutyCycle/100为占空比的值



//计算CCR1 跳转值 在占空比为50%时

/* Compute CCR1 value to generate a duty cycle at 50% for channel 1 */

Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);

/* TIM1 clock enable */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);



//Time 定时基础设置

TIM_TimeBaseStructure.TIM_Prescaler = 0;

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//Time 定时设置为上升沿计算模式

TIM_TimeBaseStructure.TIM_Period = TimerPeriod;

TIM_TimeBaseStructure.TIM_ClockDivision = 0;

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

TIM_UpdateRequestConfig(TIM1,TIM_UpdateSource_Regular);

//频道1的PWM 模式设置

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;//TIM_OCMode_Toggle;

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//选择输出比较状态

TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;//选择互补输出比较状态

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//设置输出极性

TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;//设置互补输出极性

TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;

TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

//装载比较寄存器，判断什么时候发生PWM翻转

TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;//使能频道1配置

TIM_OC1Init(TIM1, &TIM_OCInitStructure);

//使能TIM1 CCR2寄存器上的 载入

TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Disable);

TIM_ClearITPendingBit(TIM1,TIM_IT_CC1);



//装载比较寄存器，判断什么时候发生PWM翻转

TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;//使能频道2配置

TIM_OC2Init(TIM1, &TIM_OCInitStructure);

//使能TIM1 CCR2寄存器上的 载入

TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Disable);

TIM_ClearITPendingBit(TIM1,TIM_IT_CC1);

//使能ARR寄存器 加载

TIM_ARRPreloadConfig(TIM1,ENABLE);

//死区设置

TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable; //运行模式下输出

TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable; //空闲模式下输出选择

TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1; //锁定设置，锁定级别1

TIM_BDTRInitStructure.TIM_DeadTime = 0x0F; //死区时间

TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable; //刹车功能使能

TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low; //刹车输入极性，即刹车控制引脚接GND时，PWM停止

TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable; //自动输出使能



TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);

TIM_Cmd(TIM1, ENABLE);

TIM_ITConfig(TIM1,TIM_IT_Update ,ENABLE);

TIM_ITConfig(TIM1,TIM_IT_CC1,ENABLE);

//TIM1 主输出使能

TIM_CtrlPWMOutputs(TIM1, ENABLE);

}



中断部分





void TIM1_CC_IRQHandler(void)



{

TIM_OCInitTypeDef TIM_OCInitStructure;

if (TIM_GetITStatus(TIM1, TIM_IT_CC1) != RESET)

{

TIM_ClearITPendingBit(TIM1, TIM_IT_CC1);

if(Num_tim1==500000)

{

Num_tim1=0;

if(PWM_num==5)

{

PWM_num=1;

SETPwmPulse(PWM_num);

//TIM_SetCompare1();

}

else

{

SETPwmPulse(PWM_num);

PWM_num++;

}

}

else 

{

Num_tim1++;

}

}

else if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)

{

TIM_ClearITPendingBit(TIM1, TIM_IT_Update);

}

}

/*******************************************************

  * [url=home.php?mod=space&uid=95362]@func[/url] SETPwmPulse()

  * @brief

  * @param

  * @



********************************************************/

void SETPwmPulse(char num)

{

        switch(num)

                {

                        case 1:

                                //50%

                                Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);

                                Channel2Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);

                                break;

                        case 2:

                                //37.5%

                                Channel1Pulse = (uint16_t) (((uint32_t) 375 * (TimerPeriod - 1)) / 1000);

                                Channel2Pulse = (uint16_t) (((uint32_t) 375 * (TimerPeriod - 1)) / 1000);

                                break;

                        case 3:

                                //25%

                                Channel1Pulse = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100);

                                Channel2Pulse = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100);

                                break;

                        case 4:

                                //12.5%

                                Channel1Pulse = (uint16_t) (((uint32_t) 125 * (TimerPeriod - 1)) / 1000);

                                Channel2Pulse = (uint16_t) (((uint32_t) 125 * (TimerPeriod - 1)) / 1000);

                                break;

                        default:

                                //77.5%

                                Channel1Pulse = (uint16_t) (((uint32_t) 775 * (TimerPeriod - 1)) / 1000);

                                Channel2Pulse = (uint16_t) (((uint32_t) 775 * (TimerPeriod - 1)) / 1000);

        }

        

         TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;//使能频道1配置

          TIM_OC1Init(TIM1, &TIM_OCInitStructure);

          //TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;//使能频道1配置

          //TIM_OC2Init(TIM1, &TIM_OCInitStructure);

}