用原子哥F4板子学会PWM输出后换了块F1板子死活输出不了

smzztx · 发表于 2015-8-11 17:25:28

代码如下：

[mw_shl_code=c,true]#include "pwm.h" void TIM4_PWM_Init(u16 arr,u16 psc) { TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure; GPIO_InitTypeDef GPIO_InitStructure; TIM_OCInitTypeDef TIM_OCInitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);//使能定时器时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC,ENABLE);//使能GPIO外设 //设置该引脚为复用输出功能,输出TIM4 CH3的PWM脉冲波形 GPIOB.8 正向 //设置该引脚为复用输出功能,输出TIM4 CH4的PWM脉冲波形 GPIOB.9 正向 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_6|GPIO_Pin_7; //TIM4_CH3,TIM4_CH4,TIM4_CH1,TIM4_CH2 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Pin=GPIO_Pin_3|GPIO_Pin_1; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化GPIO //初始化TIM4 TIM_TimeBaseInitStructure.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 TIM_TimeBaseInitStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 TIM_TimeBaseInitStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式 TIM_TimeBaseInit(TIM4, &TIM_TimeBaseInitStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位 //初始化TIM4 Channel2 PWM模式 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_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高 TIM_OC1Init(TIM4, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM4 OC1-4 TIM_OC2Init(TIM4, &TIM_OCInitStructure); TIM_OC3Init(TIM4, &TIM_OCInitStructure); TIM_OC4Init(TIM4, &TIM_OCInitStructure); TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable); //使能TIM4在CCR1-4上的预装载寄存器 TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable); TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable); TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable); TIM_Cmd(TIM4, ENABLE); //使能TIM4 GPIO_ResetBits(GPIOC,GPIO_Pin_3); GPIO_ResetBits(GPIOC,GPIO_Pin_1); }[/mw_shl_code]