请教STM32F0的PWM的问题。

beamart · 发表于 2014-8-26 09:17:20

void PWM_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

// TIM3参数设置
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

// 配置GPIO管脚参数设置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_1); // GPIO管脚复用设置
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_1);

TIM_TimeBaseStructure.TIM_Period = 2250; //自动重装载值，取值必须在0x0000~0xFFFF之间
TIM_TimeBaseStructure.TIM_Prescaler =0; //预分频值，取值必须在0x0000~0xFFFF之间，+1为分频系数
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //时钟分割
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
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_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //TIM脉冲宽度调制模式1
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,取值必须在0x0000~0xFFFF之间，占空比101/1001
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;

TIM_OC1Init(TIM3, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
TIM_OC4Init(TIM3, &TIM_OCInitStructure);
TIM_Cmd(TIM3, ENABLE);
TIM_CtrlPWMOutputs(TIM3, ENABLE);
}
上面是我配置TIM3的PWM的程序，但是PA6，PA7作PWM1，PWM2输出时不正常，而另外的PWM3，PWM4输出是正常的，怎么回事啊？问题出在哪儿？
IO口时钟我程序开始时就用这句话使能了的RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC, ENABLE);

liucongwoshi · 发表于 2014-8-26 14:58:24

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;

这两句是定义管脚的，GPIO_Pin_6 | GPIO_Pin_7是PA6和PA7，GPIO_Pin_0 | GPIO_Pin_1这个两个确定是PB0和PB1?
你看一下定义。