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
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