大家好，在proteus仿真STM32输出PWM波时，使用PA6（TIM3_CH1）、PA7（TIM3_CH2）两个相邻引脚，程序配置也是几乎没有差别，但是结果是PA7正常输出，PA6却没动静，一直输出低电平，下面是源码和图片，希望大家帮忙看一下：
- #include "pwm.h"
- //PWM输出初始化
- //arr：自动重装值
- //psc：时钟预分频数
- void TIM3_PWM_Init(u16 arr,u16 psc)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE); //使能GPIO外设时钟使能
-
- //设置该引脚为复用输出功能,输出TIM3 CH1 CH2的PWM脉冲波形
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7; //TIM_CH1/2
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
-
- TIM_TimeBaseStructure.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_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
- TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
-
- 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_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
-
- TIM_OC1Init(TIM3, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
- TIM_OC2Init(TIM3, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
-
- TIM_CtrlPWMOutputs(TIM3,ENABLE); //MOE 主输出使能
- TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); //CH1预装载使能
- TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //CH1预装载使能
-
- TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIMx在ARR上的预装载寄存器
-
- TIM_Cmd(TIM3, ENABLE); //使能TIM3
- }
- #include "stm32f10x.h"
- #include "delay.h"
- #include "pwm.h"
- int main(void)
- {
- RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);
- delay_init();
- TIM3_PWM_Init(99,719);
- TB6612_Init(); //电机驱动引脚初始化
- while(1)
- {
- STBY = 1;
-
- AIN1 = 1;
- AIN2 = 0;
-
- BIN1 = 1;
- BIN2 = 0;
-
- TIM_SetCompare1(TIM3,88);
- TIM_SetCompare2(TIM3,50);
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