spwm波形不能输出，模拟出来的是一条横线

hpei123 · 发表于 2015-10-13 20:34:30

#include"pbdata.h"
u8 a=0;
u16 i=0;
u8 Sin_Table[100]={ 0x7F,0x87,0x8F,0x97,0x9F,0xA6,0xAE,0xB5,0xBC,0xC3,0xCA,0xD0,0xD6,0xDC,0xE1,0xE6
,0xEB,0xEF,0xF2,0xF6,0xF8,0xFA,0xFC,0xFD,0xFE,0xFE,0xFE,0xFD,0xFC,0xFA,0xF8,0xF6
,0xF2,0xEF,0xEB,0xE6,0xE1,0xDC,0xD6,0xD0,0xCA,0xC3,0xBC,0xB5,0xAE,0xA6,0x9F,0x97
,0x8F,0x87,0x7F,0x77,0x6F,0x67,0x5F,0x58,0x50,0x49,0x42,0x3B,0x34,0x2E,0x28,0x22
,0x1D,0x18,0x13,0x0F,0x0C,0x08,0x06,0x04,0x02,0x01,0x00,0x00,0x00,0x01,0x02,0x04
,0x06,0x08,0x0C,0x0F,0x13,0x18,0x1D,0x22,0x28,0x2E,0x34,0x3B,0x42,0x49,0x50,0x58
,0x5F,0x67,0x6F,0x77};

void Time_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;

//第一步：配置时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_TIM1,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE); //时钟配置

//第二步，配置goio口
/********TIM1_CH1 引脚配置*********/
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; //设置为复用浮空输出
GPIO_Init(GPIOA,&GPIO_InitStructure);

//第三步，定时器基本配置
TIM_TimeBaseStructure.TIM_Period=360-1; // 自动重装载寄存器的值 36M/360=100khz
TIM_TimeBaseStructure.TIM_Prescaler=2-1; // 时钟预分频数
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; // 采样分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//向上计数
TIM_TimeBaseStructure.TIM_RepetitionCounter=0;//重复寄存器，用于自动更新pwm占空比
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

TIM_TimeBaseStructure.TIM_Period = 3600-1; //装载值36M/3600=10khz
TIM_TimeBaseStructure.TIM_Prescaler = 2-1; //预分频(时钟分频)72M/(2)=36M
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure); //初始化定时器的值

//第四步pwm输出配置
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1; //设置为pwm1输出模式
TIM_OCInitStructure.TIM_Pulse=180; //设置占空比时间
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High; //设置输出极性
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable; //使能该通道输出
TIM_OC1Init(TIM1, &TIM_OCInitStructure);

//第五步，死区和刹车功能配置，高级定时器才有的，通用定时器不用配置
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Disable;//运行模式下输出选择
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Disable;//空闲模式下输出选择
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF; //锁定设置
TIM_BDTRInitStructure.TIM_DeadTime = 0x90; //死区时间设置
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable; //刹车功能使能
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;//刹车输入极性
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;//自动输出使能
TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);

//第六步，使能端的打开
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能TIMx在CCR1上的预装载寄存器
TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
TIM_Cmd(TIM1,ENABLE); //打开TIM2
//下面这句是高级定时器才有的，输出pwm必须打开
TIM_CtrlPWMOutputs(TIM1, ENABLE); //pwm输出使能，一定要记得打开

TIM_ClearFlag(TIM2,TIM_FLAG_Update); //清除定时器中断标志
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE); //使能中断

TIM_Cmd(TIM2,ENABLE); //开启时钟
}

void NVIC_Configuration(void)//嵌套中断配置
{
NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn; //选择TIM2中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;//
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0; //
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;//使能

NVIC_Init(&NVIC_InitStructure);
}
void TIM2_IRQHandler(void)
{

if(TIM_GetITStatus(TIM2,TIM_IT_Update)!=RESET) //判断是否定时中断
{
i=0;
if(a==99)
a=0;
PWM_Pulse=Sin_Table[a];
a++;
}

TIM_ClearITPendingBit(TIM2, TIM_FLAG_Update);//必须清除中断标志位否则一直中断
}

int main(void)
{
void Time_Init();
void NVIC_Configuration();
void TIM2_IRQHandler();

while(1);

}