使用STM32大家的定時器產生SPWM波，經過濾波可產生正弦波源碼下載：
SPWM輸出.rar
(283.04 KB, 下載次數: 588)
2016-1-4 17:16 上傳
點擊文件名下載附件
- #include "SPWM.h"
- #include "led.h"
- #include "usart.h"
- u16 TimerPeriod = 7200;
- u16 DutyFactor = 50;
- void TIM_Int_Init(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4 | RCC_APB1Periph_TIM3,ENABLE); //時鐘使能
-
-
- /* GPIOA配置:通道PA.6和PA.7作為輸出引腳*/
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
-
-
- TIM_TimeBaseStructure.TIM_Prescaler = 0;
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //計數方式
- TIM_TimeBaseStructure.TIM_Period = TimerPeriod - 1;
- TIM_TimeBaseStructure.TIM_ClockDivision = 0;
- TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
-
- TIM_DeInit(TIM4); //這邊是普通定時器的初始化和中斷申請
- TIM_TimeBaseStructure.TIM_Period=1; //自動重裝載寄存器的值
- TIM_TimeBaseStructure.TIM_Prescaler= 3599; //時鐘預分頻數
- TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; //采樣分頻
- TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//計數方式
- TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
- TIM_ClearFlag(TIM4, TIM_FLAG_Update); //清除溢出中斷標志
- TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE); // 計數溢出時觸發中斷
- //根據NVIC_InitStruct中指定的參數初始化外設NVIC寄存器
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
- NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn; //通道TIM3
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//占優先級
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //副優先級
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
-
- }
- //定時器4中斷服務程序
- void TIM4_IRQHandler(void)
- {
- static vu16 sign = 0;
- static vu16 Counter_sine=0;
- static vu16 Duty_Cycle_sinewavetable[128]={0x0,0x83,0x105,0x187,0x209,0x28A,0x30A,0x38A,
- 0x409,0x486,0x502,0x57D,0x5F7,0x66F,0x6E5,0x75A,
- 0x7CC,0x83D,0x8AB,0x917,0x981,0x9E8,0xA4D,0xAAF,
- 0xB0E,0xB6B,0xBC4,0xC1B,0xC6E,0xCBE,0xD0B,0xD54,
- 0xD9A,0xDDD,0xE1C,0xE57,0xE8F,0xEC3,0xEF3,0xF1F,
- 0xF48,0xF6C,0xF8D,0xFA9,0xFC2,0xFD6,0xFE6,0xFF3,
- 0xFFB,0xFFF,0xFFF,0xFFB,0xFF3,0xFE6,0xFD6,0xFC2,
- 0xFA9,0xF8D,0xF6C,0xF48,0xF1F,0xEF3,0xEC3,0xE8F,
- 0xE57,0xE1C,0xDDD,0xD9A,0xD54,0xD0B,0xCBE,0xC6E,
- 0xC1B,0xBC4,0xB6B,0xB0E,0xAAF,0xA4D,0x9E8,0x981,
- 0x917,0x8AB,0x83D,0x7CC,0x75A,0x6E5,0x66F,0x5F7,
- 0x57D,0x502,0x486,0x409,0x38A,0x30A,0x28A,0x209,
- 0x187,0x105,0x83,0x0};
- if (TIM_GetITStatus(TIM4 ,TIM_IT_Update) == SET)
- {
- if(sign == 0)
- {
- TIM_SetCompare1(TIM3,Duty_Cycle_sinewavetable[Counter_sine]);
- TIM_SetCompare2(TIM3,0);
- Counter_sine++;
- if(Counter_sine==100) //半周期采樣100個點
- {
- Counter_sine=0;
- sign = 1;
- }
- }else{
- TIM_SetCompare1(TIM3,0);
- TIM_SetCompare2(TIM3,Duty_Cycle_sinewavetable[Counter_sine]);
- Counter_sine++;
- if(Counter_sine==100)
- {
- Counter_sine=0;
- sign = 0;
- }
- }
- }
- TIM_ClearITPendingBit(TIM4 , TIM_FLAG_Update);
- }
- //TIM3 PWM部分初始化
- //PWM輸出初始化
- //arr：自動重裝值
- //psc：時鐘預分頻數
- void TIM_PWM_Init(void)
- {
-
- TIM_OCInitTypeDef TIM_OCInitStructure;
- TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
-
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
- TIM_OCInitStructure.TIM_Pulse = DutyFactor * 7200 / 100;//設置占空比
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//以上四行代碼設置PWM的空閑電平、波形方式的！
-
- TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
- TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
- TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
- TIM_OC1Init(TIM3, &TIM_OCInitStructure);
- TIM_OC2Init(TIM3, &TIM_OCInitStructure); //初始化兩組互補的PWM
- /* 自動輸出使能,中斷,死區相關的設置*/
- TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
- TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
- TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
- TIM_BDTRInitStructure.TIM_DeadTime = 12;//死區時間為 12/SYSTEMCLK (ns)
- TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;//關閉外部break功能
- TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
- TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
- TIM_BDTRConfig(TIM3, &TIM_BDTRInitStructure);
- TIM_CtrlPWMOutputs(TIM3, ENABLE);
- }
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