stm32 mini板 tim1 PWM和LCD初始化冲突，求解决

hejunsan · 发表于 2016-4-15 21:15:07

这是PWM.c的程序
void TIM1_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);  //使能GPIO外设时钟使能
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, DISABLE);

//设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11; //TIM_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

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    80K
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  不分频
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); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //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_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
  TIM_OC2Init(TIM1, &TIM_OCInitStructure);
  TIM_OC3Init(TIM1, &TIM_OCInitStructure);
  TIM_OC4Init(TIM1, &TIM_OCInitStructure);

TIM_CtrlPWMOutputs(TIM1,ENABLE); //MOE 主输出使能

TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH1预装载使能
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);
  TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器

TIM_Cmd(TIM1, ENABLE);  //使能TIM1

}
这是主函数

int main(void)
{
u16 led0pwmval=0;
u8 dir=1;
delay_init();            //延时函数初始化
//LED_Init();       //初始化与LED连接的硬件接口

   LCD_Init();//不加LCD初始化，PWM正常，加了，管脚都是高电平，不变了
   TIM1_PWM_Init(899,0);//不分频。PWM频率=72000/(899+1)=80Khz

// TIM5_PWM_Init(899,0);
   while(1)
{
delay_ms(10);
if(dir)led0pwmval++;
else led0pwmval--;
if(led0pwmval>300)dir=0;
if(led0pwmval==0)dir=1;
TIM_SetCompare1(TIM1,led0pwmval);
TIM_SetCompare2(TIM1,led0pwmval);
   TIM_SetCompare3(TIM1,led0pwmval);
   TIM_SetCompare4(TIM1,led0pwmval);

}


}

LCD_Init();//不加LCD初始化，PWM正常，加了，管脚都是高电平，不变了
设置的是tim1四路输出

求解