定时器1的通道3互补输出SPWM问题

LXZz · 发表于 2021-6-2 00:20:29

各位大佬好，我参考网友@nashui_sx的代码，设置定时器1 通道3输出SPWM波形，现已实现通道1输出了互补的波形，
现按照如下通道设置DMA通道6，TIM1_CH3通道3输出SPWM，但是如下代码只能输出互补的方波，没有可变PWM，定时器与DMA都对应手册设置，感觉DMA设置有问题，但又不知道问题在那，恳请各位解惑，谢谢！

备注：如下代码更改位DMA通道2，设置定时器为通道1，不用改为其他代码，即可在A8/B13输出互补的SPWM

u16 TIM1_Spwm_Buf[TIM1_Spwm_Buf_Size];  //发送数据缓冲区，控制占空比

void TIM1_Spwm_Creat_Buf(void)
{
u32 i;
float inc=2*PI/TIM1_Spwm_Buf_Size;       //计算增量

for(i=0;i<TIM1_Spwm_Buf_Size;i++)
{
      TIM1_Spwm_Buf=(u16)(TIM1_Spwm_Buf_Zhouqi/2*(1+sin(inc*i))+0.5); //得到一个0-TIM1_Spwm_Buf_Zhouqi的正弦波控制spwm  +0.5是为了最大值能够达到TIM1_Spwm_Buf_Zhouqi 最小能到0
}
}
void TIM1_Spwm_Init(void)
{
GPIO_InitTypeDef       GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef            TIM_OCInitStructure; //输出通道配置
TIM_BDTRInitTypeDef       TIM_BDTRInitStructure; //死区和刹车配置
  DMA_InitTypeDef       DMA_InitStructure;
  NVIC_InitTypeDef       NVIC_InitStructure;
  TIM1_Spwm_Creat_Buf();

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定时器3时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //使能定时器1时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);  //使能GPIO外设和AFIO复用功能模块时钟
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

// 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);
//  //初始化TIM1
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
// GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
  //初始化TIM1
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM1, ENABLE);

TIM_TimeBaseStructure.TIM_Period = TIM1_Spwm_Buf_Zhouqi-1;                      //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =35;                   //设置用来作为TIMx时钟频率除数的预分频值
TIM_TimeBaseStructure.TIM_ClockDivision =0;                //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;          //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;    //输出极性:TIM输出比较极性高
TIM_OC3Init(TIM1, &TIM_OCInitStructure);                   //初始化通道3
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);          //使能TIM1在通道3上的预装载寄存器

/*TIM1高级定时器互补通道输出配置*/
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;    //PWM互补输出使能
TIM_OCInitStructure.TIM_OCNPolarity  = TIM_OCNPolarity_High;       //互补PWM极性
TIM_OCInitStructure.TIM_OCIdleState  = TIM_OCIdleState_Set;          //输出空闲状态
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;    //PWM互补输出空闲状态
TIM_OC3Init(TIM1, &TIM_OCInitStructure);                           //根据指定的参数初始化外设TIM1 OC3

/*死区和刹车功能配置*/
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       = 0x1F; //设置TIM1_BDTR的DTG[7:0]
TIM_BDTRInitStructure.TIM_Break          = TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);

/*DMA功能配置*/
DMA_DeInit(DMA1_Channel6);                                              //将DMA的通道1寄存器重设为缺省值
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&TIM1->CCR1;             //DMA外设基地址问题在这里
DMA_InitStructure.DMA_MemoryBaseAddr    = (u32)&TIM1_Spwm_Buf;             //DMA内存基地址
DMA_InitStructure.DMA_DIR             = DMA_DIR_PeripheralDST;       //DMA_DIR_PeripheralSRC:从外设读  DMA_DIR_PeripheralDST:从内存读
DMA_InitStructure.DMA_BufferSize       = TIM1_Spwm_Buf_Size;                            //DMA通道的DMA缓存的大小，实测不加1少一个，应该是最后一个还没输出就中断关闭定时器了，+1就好了
DMA_InitStructure.DMA_PeripheralInc    = DMA_PeripheralInc_Disable;    //外设地址寄存器不变
DMA_InitStructure.DMA_MemoryInc       = DMA_MemoryInc_Enable;    //内存地址寄存器递增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//数据宽度为8位
DMA_InitStructure.DMA_MemoryDataSize    = DMA_MemoryDataSize_HalfWord; //数据宽度为8位
DMA_InitStructure.DMA_Mode             = DMA_Mode_Circular;             //工作在正常模式
DMA_InitStructure.DMA_Priority          = DMA_Priority_Medium;          //DMA通道 x拥有中优先级
DMA_InitStructure.DMA_M2M             = DMA_M2M_Disable;             //是否开启内存到内存传输(关闭表示只有事件产生才传输一次数据，开启表示一直传输)DMA_M2M_Disable:非存储器到存储器模式(关闭内存到内存模式)  DMA_M2M_Enable:启动存储器到存储器模式(开启内存到内存模式)
DMA_Init(DMA1_Channel6, &DMA_InitStructure);                            //根据DMA_InitStruct中指定的参数初始化DMA的通道USART1_Tx_DMA_Channel所标识的寄存器
DMA_Cmd(DMA1_Channel6,ENABLE);                                        //DMA使能
TIM_DMACmd(TIM1, TIM_DMA_CC1, ENABLE);       //定时器TIM_DMA_CC1 TIM_DMA_Update使能
// TIM_DMACmd(TIM1, TIM_DMA_Update,ENABLE);

NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel6_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_ClearFlag(DMA1_Channel6_IRQn);                                        //清除DMA所有标志

DMA_ITConfig(DMA1_Channel6,DMA_IT_TC,ENABLE);                            //开传输完成中断
TIM_SetCompare3(TIM1,TIM1_Spwm_Buf[0]);    //通道1
TIM_CtrlPWMOutputs(TIM1, ENABLE);
TIM_Cmd(TIM1, ENABLE);       //使能TIM1
}