tim8 ch4 ,pc9，无法输出PWM

x1213378204 · 发表于 2014-11-18 16:28:23

主函数中的程序如下：
Tim8_Pwm_Init(10000-1,72-1);
while(1)
{
TIM_SetCompare4(TIM8,5000);
}

无法输出PWM，求指导

x1213378204 · 发表于 2014-11-18 16:29:22

[mw_shl_code=c,true]//PWM输出,pc.9,tim8.4 void Tim8_Pwm_Init(u16 arr,u16 psc) { //调取宏定义 GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStruct; //使能时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8|RCC_APB2Periph_GPIOC, ENABLE); //IO口初始化 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC, &GPIO_InitStructure); //TIM8初始化 TIM_TimeBaseStructure.TIM_Period = arr; TIM_TimeBaseStructure.TIM_Prescaler =psc; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure); //TIM8 CHANNEL4 PWM输出初始化 TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_Low; TIM_OCInitStruct.TIM_Pulse=300; TIM_OC4Init(TIM8, &TIM_OCInitStruct); TIM_OC4PreloadConfig(TIM8, TIM_OCPreload_Enable); //预装载 TIM_Cmd(TIM8, ENABLE); }[/mw_shl_code]

lycreturn · 发表于 2014-11-18 23:25:34

先把IO口设置成复用推挽模式

x1213378204 · 发表于 2014-11-19 09:38:15

回复【3楼】lycreturn:
---------------------------------
为什么要设置为复用推挽呢?

x1213378204 · 发表于 2014-11-19 11:35:14

回复【3楼】lycreturn:
---------------------------------
还是不行呀

亲亻尔嘴 · 发表于 2014-11-19 12:01:31

高级定时器PWM输出时需要用这个函数 TIM_CtrlPWMOutputs使能输出

x1213378204 · 发表于 2014-11-19 14:49:48

回复【6楼】亲亻尔嘴 :
---------------------------------
TIM1是行了，但是TIM8死活不行，这两个的代码没什么变化呀

[mw_shl_code=c,true]void Tim8_Pwm_Init(u16 arr,u16 psc) { //调取宏定义 GPIO_InitTypeDef GPIO_InitStruct; TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct; TIM_OCInitTypeDef TIM_OCInitStruct; //使能时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); //IO口初始化 GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_8|GPIO_Pin_7|GPIO_Pin_6; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC, &GPIO_InitStruct); //TIM8初始化 TIM_TimeBaseInitStruct.TIM_Period = arr; TIM_TimeBaseInitStruct.TIM_Prescaler =psc; TIM_TimeBaseInitStruct.TIM_ClockDivision = 0; TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM8, &TIM_TimeBaseInitStruct); //TIM8 CHANNEL4 PWM输出初始化 TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_Low; TIM_OCInitStruct.TIM_Pulse=300; TIM_OC4Init(TIM8, &TIM_OCInitStruct); TIM_OC3Init(TIM8, &TIM_OCInitStruct); TIM_OC2Init(TIM8, &TIM_OCInitStruct); TIM_OC1Init(TIM8, &TIM_OCInitStruct); TIM_OC4PreloadConfig(TIM8, TIM_OCPreload_Enable); //预装载 TIM_OC3PreloadConfig(TIM8, TIM_OCPreload_Enable); TIM_OC2PreloadConfig(TIM8, TIM_OCPreload_Enable); TIM_OC1PreloadConfig(TIM8, TIM_OCPreload_Enable); TIM_Cmd(TIM8, ENABLE); TIM_CtrlPWMOutputs(TIM8, ENABLE); } void Tim1_Pwm_Init(u16 arr,u16 psc) { //调取宏定义 GPIO_InitTypeDef GPIO_InitStruct; TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct; TIM_OCInitTypeDef TIM_OCInitStruct; //使能时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //IO口初始化 GPIO_InitStruct.GPIO_Pin = GPIO_Pin_11|GPIO_Pin_10; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStruct); //TIM1初始化 TIM_TimeBaseInitStruct.TIM_Period = arr; TIM_TimeBaseInitStruct.TIM_Prescaler =psc; TIM_TimeBaseInitStruct.TIM_ClockDivision = 0; TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStruct); //TIM1 PWM输出初始化 TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_Low; TIM_OCInitStruct.TIM_Pulse=300; TIM_OC4Init(TIM1, &TIM_OCInitStruct); TIM_OC3Init(TIM1, &TIM_OCInitStruct); TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable); //预装载 TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable); TIM_Cmd(TIM1, ENABLE); TIM_CtrlPWMOutputs(TIM1, ENABLE); }[/mw_shl_code]

主函数的调用如下

[mw_shl_code=c,true]int main(void) { Led_Init(); //LED初始化 Beep_Init(); //BEEP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(BOUND1); //串口1初始化 Tim8_Pwm_Init(10000-1,72-1); Tim1_Pwm_Init(10000-1,72-1); while(1) { TIM_SetCompare4(TIM1,1000); TIM_SetCompare3(TIM1,2000); TIM_SetCompare1(TIM8,1000); TIM_SetCompare2(TIM8,3000); TIM_SetCompare3(TIM8,5000); TIM_SetCompare4(TIM8,7000); LED3=~LED3; delay_ms(500); LED3=~LED3; delay_ms(500); } }[/mw_shl_code]