int acg[300]={
245,240,234,229,224,219,213,208,203,198,193,188,183,178,173,
168,163,158,153,148,144,139,134,130,125,120,116,112,107,103,
99,95,91,87,83,79,75,71,68,64,61,57,54,51,48,45,42,39,36,33,
31,28,26,24,22,20,18,16,14,12,11,9,8,7,5,4,4,3,2,1,1,0,0,0,0,
0,0,0,1,1,2,3,4,4,5,7,8,9,11,12,14,16,18,20,22,24,26,28,31,33,
36,39,42,45,48,51,54,57,61,64,68,71,75,79,83,87,91,95,99,103,107,
112,116,120,125,130,134,139,144,148,153,158,163,168,173,178,183,
188,193,198,203,208,213,219,224,229,234,240,245,250,255,260,266,
271,276,281,287,292,297,302,307,312,317,322,327,332,337,342,347,
352,356,361,366,370,375,380,384,388,393,397,401,405,409,413,417,
421,425,429,432,436,439,443,446,449,452,455,458,461,464,467,469,
472,474,476,478,480,482,484,486,488,489,491,492,493,495,496,496,
497,498,499,499,500,500,500,500,500,500,500,499,499,498,497,496,
496,495,493,492,491,489,488,486,484,482,480,478,476,474,472,469,
467,464,461,458,455,452,449,446,443,439,436,432,429,425,421,417,
413,409,405,401,397,393,388,384,380,375,370,366,361,356,352,347,
342,337,332,327,322,317,312,307,302,297,292,287,281,276,271,266,
260,255,250};
void TIM8_Init(u16 arr, u16 psc) //C6 A7 TIM8CH1 C7 B0 TIM8CH2 C8 B1 TIM8CH3
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
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_0 | GPIO_Pin_1;
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_6 | GPIO_Pin_7 | GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC,&GPIO_InitStructure);
TIM_DeInit(TIM8);
TIM_TimeBaseInitStructure.TIM_Period = arr;
TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM8,&TIM_TimeBaseInitStructure);
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 = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM8, &TIM_OCInitStructure);
TIM_OC2Init(TIM8, &TIM_OCInitStructure);
TIM_OC3Init(TIM8, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM8,TIM_OCPreload_Enable);
TIM_OC2PreloadConfig(TIM8,TIM_OCPreload_Enable);
TIM_OC3PreloadConfig(TIM8,TIM_OCPreload_Enable);
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
TIM_BDTRInitStructure.TIM_DeadTime = 0;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Disable;
TIM_BDTRConfig(TIM8, &TIM_BDTRInitStructure);
//OCx输出信号与参考信号相同，只是它的上升沿相对参考信号的上升沿有一个延迟
//OCxN输出信号与参考信号相同，只是它的上升沿相对参考信号的下降沿有一个延迟
//死区设置
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_2;
TIM_BDTRInitStructure.TIM_DeadTime = 0xAC; //这里调整死区大小为3us
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM8, &TIM_BDTRInitStructure);
TIM_Cmd(TIM8, ENABLE);
TIM_CCPreloadControl(TIM8,ENABLE);
TIM_CtrlPWMOutputs(TIM8, ENABLE);
}
//通用定时器3中断初始化
//这里时钟选择为APB1的2倍，而APB1为36M
//arr：自动重装值。
//psc：时钟预分频数
//这里使用的是定时器3!
void TIM3_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能
TIM_TimeBaseStructure.TIM_Period = arr; //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 计数到5000为500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 10Khz的计数频率
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(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
TIM_Cmd(TIM3, ENABLE); //使能TIMx外设
}
//定时器3中断服务程序
void TIM3_IRQHandler(void) //TIM3中断
{
static int i=0;
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //清除TIMx的中断待处理位:TIM 中断源
for(i=0;i<300;i++)
{
TIM_SetCompare1(TIM8,acg[i]);
}
if(i>=300) i=0;
}
}
这个是SPWM波的函数内容
int main(void)
{
delay_init(); //延时函数初始化
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置NVIC中断分组2:2位抢占优先级，2位响应优先级
uart_init(115200); //串口初始化为115200
LED_Init(); //LED端口初始化
TIM8_Init(500-1,72-1);//C6 A7 TIM8CH1 C7 B0 TIM8CH2 C8 B1 TIM8CH3
TIM3_Int_Init(100-1,48-1);//66.7us更新一次
LED0=0;
LED1=1;
while(1)
{
;
}
}
这个是主函数内容
SPWM波为500时是满占空比，死区时间我也加了，可是我同学说这个代码有问题，我看了一下，网上差不多都是这样的
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发表于 2019-7-22 20:34:10
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