stm32f103c8t6最小系统，高级定时器pwm输出问题

单片机入门 · 发表于 2017-12-16 16:47:26

最近在做小车，用两个定时器控制输出pwm，但是不知道为什么总是只有一路有输出，不知道是什么原因？最小系统版的原因？希望大佬们可以帮帮忙，解决我的问题，不胜感激！
代码如下
[mw_shl_code=c,true]
void TIM1_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef       GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef       TIM1_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1|RCC_APB2Periph_GPIOA , 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);

TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

TIM1_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM1_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM1_OCInitStructure.TIM_Pulse = 200;
TIM1_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM1, &TIM1_OCInitStructure);
TIM_OC1PreloadConfig(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能
}
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM3_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

TIM3_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM3_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM3_OCInitStructure.TIM_Pulse =93;
TIM3_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM3_OCInitStructure);
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIMx在ARR上的预装载寄存器
TIM_Cmd(TIM3, ENABLE);  //使能TIM1
}

int main(void)
{
u16 led0pwmval=850;
// NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
delay_init();    //延时函数初始化
EXTIX_Init();    //外部中断初始化
TIM1_PWM_Init(1439,999);//不分频。PWM频率=72000/(899+1)=80Khz
TIM3_PWM_Init(1439,999);

while(1)
{
TIM_SetCompare1(TIM1,led0pwmval); // PWM控制电机电机
TIM_SetCompare1(TIM3,93);
}
}[/mw_shl_code]