无复用，TIM3.1可以输出PWM，但是TIM5.2却不行

x1213378204 · 发表于 2014-6-23 14:21:06

[mw_shl_code=c,true]/**********声明**********/ #include "delay.h" #include "sys.h" #include "led.h" #include "usart.h" #include "time.h" #define BOUND 115200 //串口通信波特率 int main(void) //主函数 { u16 arr_tim3_out=900-1,psc_tim3_out=7200-1; //PWM频率 u16 arr_tim5_out=900-1,psc_tim5_out=7200-1; //PWM频率 u16 D6pwmval=600; u16 D5pwmval=300; /**********初始化**********/ led_init(); //LED初始化 delay_init(); //延时初始化 NVIC_Configuration(); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级 usart_init(BOUND); //串口初始化 printf("系统初始化中，请稍等...\n"); tim3_pwm_init(arr_tim3_out,psc_tim3_out); tim5_pwm_init(arr_tim5_out,psc_tim5_out); delay_ms(100); printf("初始化完成!\n"); while(1) { delay_ms(10); //PWM输出试验 TIM_SetCompare1(TIM3,D5pwmval); TIM_SetCompare2(TIM5,D6pwmval); } } [/mw_shl_code]

[mw_shl_code=c,true]//PWM输出,pa.6,tim3.1,out_1 void tim3_pwm_init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStruct; TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct; TIM_OCInitTypeDef TIM_OCInitStruct; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); GPIO_InitStruct.GPIO_Pin=GPIO_Pin_6; //引脚 GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz; //速度50MHz GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF_PP; //推挽输出 GPIO_Init(GPIOA,&GPIO_InitStruct); TIM_TimeBaseInitStruct.TIM_Prescaler=psc; TIM_TimeBaseInitStruct.TIM_CounterMode=TIM_CounterMode_Up; TIM_TimeBaseInitStruct.TIM_Period=arr; TIM_TimeBaseInitStruct.TIM_ClockDivision=0; TIM_TimeBaseInitStruct.TIM_RepetitionCounter=0; TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStruct); TIM_OCInitStruct.TIM_OCMode=TIM_OCMode_PWM1; TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable; TIM_OCInitStruct.TIM_OCPolarity=TIM_OCPolarity_High; TIM_OC1Init(TIM3,&TIM_OCInitStruct); TIM_OC1PreloadConfig(TIM3,TIM_OCPreload_Enable); TIM_Cmd(TIM3,ENABLE); } //PWM输出,pa.1,tim5.2,out_0 void tim5_pwm_init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; 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_RepetitionCounter=0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC2Init(TIM5, &TIM_OCInitStructure); TIM_OC2PreloadConfig(TIM5, TIM_OCPreload_Enable); //预装载 TIM_Cmd(TIM5, ENABLE); }[/mw_shl_code]

没有复用，TIM3.1（对应PA.6）可以输出PWM，但是TIM5.2（对应PA.1）却不行,结果如上，是程序的问题吗？