stm32 产生 spwm 波 通过 stm32 可以输出 3 对互补 spwm 波，以一对互补 spwm 波为例，另外还可以通过 Keil 自带的 logic analyzer 查看 PORTA、B 的波形，很直观的仿真结果，可以帮助调试！ 产生 2 路互补 spwm 波，管脚为 PA8 和 PB13，GPIO 初始化函数如下： SPWM 产生原理是规则采样法：ton = Tc*(1 + m*sin(w*ti))/2，通过 PC 计算出来，供单片机以 后查找表，缺点是波形有点失真； void PWM_GOIO_INIT(void) { GPIO_InitTypeDef GPIO_InitStructure;/*允许总线 CLOCK,在使用 GPIO 之前必须允许相应端的时钟. 从 STM32 的设计角度上说,没被允许的端将不接入时钟,也就不会耗能, 这是 STM32 节能的一种技巧,*/ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); /* PA8 9 10 TIM1 PWM 输出端口*/ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50M 时钟速度 GPIO_Init(GPIOA, &GPIO_InitStructure); /* PB13 14 15 是 TIM1_PWM 波的互补输出*/ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//GPIO_Mode_Out_OD; /必须选择 GPIO_Mode_AF_PP，AF_PPAF_OD 仿真无 / //波形，可能实际 需要上拉吧！AF 代表复用的意思 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50M 时钟速度 GPIO_Init(GPIOB, &GPIO_InitStructure); } 高级定时器 TIM1 设置如下： void TIM_Configuration(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; /* TIM1 clock enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); TIM_TimeBaseStructure.TIM_Period = 3600; //最大 65535 // TIM_TimeBaseStructure.TIM_Prescaler = 1; //36M72M 经过 3 分频 TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 

TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);/* Channel 1 Configuration in PWM mode */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM 模式 2 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;//TIM_OutputNState_Disable;//反向通道无效 TIM_OCInitStructure.TIM_Pulse = 20000;//CCR1_Val; //占空时间 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //互补端的极性，如果为 Low，则 PA8 PB13 两路输出一致 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; TIM_OC1Init(TIM1,&TIM_OCInitStructure); //通道 1 TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);//Disable ???? /* TIM1 counter enable */ TIM_Cmd(TIM1,ENABLE); /* TIM2 Main Output Enable */ TIM_CtrlPWMOutputs(TIM1,ENABLE);/* TIM IT enable */ TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE); } //定时器中断函数 void TIM1_UP_IRQHandler(void) { static int i = 0; CCR1_Val = 1800 + m * tab[i];//确定为正数 TIM_SetCompare1(TIM1, CCR1_Val); TIM_ClearITPendingBit(TIM1, TIM_IT_Update); i++; if(i == 200) i = 0; } volatile float m = 0.8;//调制波幅值 volatile uint16_t CCR1_Val = 0; const int16_t tab[] = { //sin 值表扩大 1800 倍 28,84,141,197,253,309,365,420,474,529, 583,636,688,740,791,842,891,940,988,1035, 1080,1125,1169,1211,1252,1292,1331,1368,1404,1439, 

1472,1504,1534,1563,1590,1616,1640,1662,1683,1702, 1720,1736,1750,1762,1773,1782,1789,1794,1798,1799, 1799,1798,1794,1789,1782,1773,1762,1750,1736,1720, 1702,1683,1662,1640,1616,1590,1563,1534,1504,1472, 1439,1404,1368,1331,1292,1252,1211,1169,1125,1080, 1035,988,940,891,842,791,740,688,636,583, 529,474,420,365,309,253,197,141,84,28, -29,-85,-142,-198,-254,-310,-366,-421,-475,-530, -584,-637,-689,-741,-792,-843,-892,-941,-989,-1036, -1081,-1126,-1170,-1212,-1253,-1293,-1332,-1369,-1405,-1440, -1473,-1505,-1535,-1564,-1591,-1617,-1641,-1663,-1684,-1703, -1721,-1737,-1751,-1763,-1774,-1783,-1790,-1795,-1799,-1800, -1800,-1799,-1795,-1790,-1783,-1774,-1763,-1751,-1737,-1721, -1703,-1684,-1663,-1641,-1617,-1591,-1564,-1535,-1505,-1473, -1440,-1405,-1369,-1332,-1293,-1253,-1212,-1170,-1126,-1081, -1036,-989,-941,-892,-843,-792,-741,-689,-637,-584, -530,-475,-421,-366,-310,-254,-198,-142,-85,-29, }; Void main(void) { RCC_Configuration(); PWM_IO_INIT(); TIM_Configuration(); NVIC_Configuration(); USART_Configuration(); While(1) { } } 以下是仿真结果：