STM32产生SPWM include

yuyang911220

• /** @author Mei Jilin
•     @date   2013/9/2
•     @brief  加入生成SPWM部分
• **/
  
• #include "timer.h"
  
• #include "led.h"
  
• static uint16_t CCR3_Val = 1800;  
• static uint16_t PrescalerValue = 0;  
• 
  
• /*PWM输出配置说明，*/
  
• /* - Prescaler = (TIM3CLK / TIM3 counter clock) - 1 选择TIMER工作在36MHZ
• 
  
•     The TIM3 is running at 36 MHz: TIM3 Frequency = TIM3 counter clock/(ARR + 1)
•                                                   = 36 MHz / 3600 = 10 KHz
•     TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR)* 100 */
  
•     /*转换周期10K*/
  
• void PWM_Init(void)  
• {  
•     TIM_TimeBaseInitTypeDef     TIM_TimeBaseStructure;  
•     TIM_OCInitTypeDef           TIM_OCInitStructure;  
•     GPIO_InitTypeDef            GPIO_InitStructure;  
•     NVIC_InitTypeDef NVIC_InitStructure;      
•         /* TIM3 clock enable */
  
•     RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);  
• 
  
•     /* GPIOA and GPIOB clock enable */
  
•     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|  
•                              RCC_APB2Periph_AFIO, ENABLE);  
•     /* GPIOA Configuration:TIM3 Channel1, 2, 3 and 4 as alternate function push-pull */
  
•     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;  
•     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  
•     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  
•     GPIO_Init(GPIOA, &GPIO_InitStructure);  
• 
  
•     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;      //TIM1_CH1N
  
•     GPIO_Init(GPIOB, &GPIO_InitStructure);  
• 
  
•      /* Compute the prescaler value */
  
•     PrescalerValue = (uint16_t) (SystemCoreClock / 36000000) - 1; //TIMER2 - 36MHZ
  
•     /* Time base configuration */
  
•     TIM_TimeBaseStructure.TIM_Period = 3600;                    /*TIM3_ARR = 2879,12.5Khz*/
  
•     TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;  
•     TIM_TimeBaseStructure.TIM_ClockDivision = 0;  
•     TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
•     TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;  
•     TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);  
• 
  
•     /* Channel 1, 2,3 and 4 Configuration in PWM mode */
  
•     TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;  
•     TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  
•     TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //关闭互补输出
  
•     TIM_OCInitStructure.TIM_Pulse = CCR3_Val;  
•     TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  
•     TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;  
•     TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;  
•     TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Set;  
•     TIM_OC1Init(TIM1, &TIM_OCInitStructure);  
• 
  
•     TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //这句的功能是让改变CCR2之后马上有效   
  
•     TIM_ITConfig(TIM1, TIM_IT_CC1, ENABLE);  
•     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);  
•     NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;  
•     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  
•     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 6;  
•     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  
•     NVIC_Init(&NVIC_InitStructure);      
• 
  
•     TIM_Cmd(TIM1, ENABLE);   
•     /* TIM1 Main Output Enable */
  
•     TIM_CtrlPWMOutputs(TIM1, ENABLE);   //TIM1需要加上这句,貌似低级定时器不需要
  
• }  
• uint16_t Duty[] = {1800,1856,1912,1968,2023,2078,2131,2183,2233,2282,2329,2373,2416,2456,2493,  
•     2528,2559,2588,2614,2636,2655,2671,2684,2692,2698,2699,2698,2692,2684,2671,2655,2636,2614,  
•     2588,2559,2528,2493,2456,2416,2373,2329,2282,2233,2183,2131,2078,2023,1968,1912,1856,1800,  
•     1743,1687,1631,1576,1521,1468,1416,1366,1317,1270,1226,1183,1143,1106,1071,1040,1011,985,  
•     963,944,928,915,907,901,900,901,907,915,928,944,963,985,1011,1040,1071,1106,1143,1183,1226,  
•     1270,1317,1366,1416,1468,1521,1576,1631,1687,1743,1799,1799};  
• uint16_t count = 0;  
• uint16_t num = sizeof(Duty)/(sizeof(Duty[0]));  
• void TIM1_CC_IRQHandler(void)  
• {  
•   if (TIM_GetITStatus(TIM1, TIM_IT_CC1) != RESET)  
•   {  
•     TIM1->SR = (uint16_t)~TIM_IT_CC1;  
•     TIM1->CCR1 = Duty[count];  
•     count++;  
•     if(count==num)  
•     {  
•         count=0;  
•     }  
•   }  
• }