TIM5设置为编码器模式，导致原来能输出PWM波的PC6（TIM8 CH1）输出不了PWM

bigrats · 发表于 2015-10-22 11:44:58

经过测试，TIM8 CH1（即PC6）本身能产生PWM，但是我在程序中加入TIM5编码模式（TIM5 CH1为PA0，TIM5 CH2为PA1）的程序之后，PC6就不能输出PWM，不知道为啥，也没存在干扰呀？
以下为程序：
1.主函数

[mw_shl_code=c,true]#include "led.h" #include "delay.h" #include "sys.h" #include "pwm.h" int main(void) { u16 led0pwmval=300; u16 ledpwmval=300; u16 Avalue; delay_init(); LED_Init(); ENC_TIM5_Init(); //TIM5编码器程序初始化 TIM8_PWM_Init(899,0); //TIM8 CH1PWM输出初始化 TIM_SetCompare1(TIM8,led0pwmval); while(1) { Avalue = TIM5->CNT; } } [/mw_shl_code]

2.定时器函数

[mw_shl_code=c,true]#include "pwm.h" #include "led.h" //TIM8 CH1 PWM输出，即PC6 void TIM8_PWM_Init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);// RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC , ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 ; //TIM_CH1 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC, &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(TIM8, &TIM_TimeBaseStructure); TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = 0; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC1Init(TIM8, &TIM_OCInitStructure); TIM_OC1PreloadConfig(TIM8, TIM_OCPreload_Enable); TIM_CtrlPWMOutputs(TIM8,ENABLE); TIM_ARRPreloadConfig(TIM8, ENABLE); TIM_Cmd(TIM8, ENABLE); } //TIM5_CH1 CH2 编码模式，即PA0与PA1 void ENC_TIM5_Init(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_ICInitTypeDef TIM_ICInitStructure; // Encoder unit connected to TIM5 GPIO_InitTypeDef GPIO_InitStructure; // TIM5 clock source enable RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); // Enable GPIOA, clock RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); // Configure PA.0,1 as encoder input GPIO_StructInit(&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); // Timer configuration in Encoder mode TIM_DeInit(TIM5); TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); TIM_TimeBaseStructure.TIM_Period = 65535; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); TIM_EncoderInterfaceConfig(TIM5, TIM_EncoderMode_TI12, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising); TIM_ICStructInit(&TIM_ICInitStructure); TIM_ICInitStructure.TIM_ICFilter = 6; TIM_ICInit(TIM5, &TIM_ICInitStructure); // Clear all pending interrupts TIM_ClearFlag(TIM5, TIM_FLAG_Update); TIM_ITConfig(TIM5, TIM_IT_Update, ENABLE); //Reset counter TIM_SetCounter(TIM5,0); // ENC_Clear_Speed_Buffer(); TIM_Cmd(TIM5, ENABLE); } [/mw_shl_code]

TIM5 CH1 CH2编码器模式下难道与TIM8 CH1有干扰？不应该呀，一个是GPIOC，一个是GPIOA。真是让人郁闷，几天了，都这样，大家帮忙看看！谢谢