大家好，在proteus仿真STM32輸出PWM波時，使用PA6（TIM3_CH1）、PA7（TIM3_CH2）兩個相鄰引腳，程序配置也是幾乎沒有差別，但是結果是PA7正常輸出，PA6卻沒動靜，一直輸出低電平，下面是源碼和圖片，希望大家幫忙看一下：
- #include "pwm.h"
- //PWM輸出初始化
- //arr：自動重裝值
- //psc：時鐘預分頻數
- 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外設時鐘使能
-
- //設置該引腳為復用輸出功能,輸出TIM3 CH1 CH2的PWM脈沖波形
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7; //TIM_CH1/2
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復用推挽輸出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
-
- TIM_TimeBaseStructure.TIM_Period = arr; //設置在下一個更新事件裝入活動的自動重裝載寄存器周期的值
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //設置用來作為TIMx時鐘頻率除數的預分頻值
- TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設置時鐘分割:TDTS = Tck_tim
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數模式
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根據TIM_TimeBaseInitStruct中指定的參數初始化TIMx的時間基數單位
-
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時器模式:TIM脈沖寬度調制模式2
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
- TIM_OCInitStructure.TIM_Pulse = 0; //設置待裝入捕獲比較寄存器的脈沖值
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //輸出極性:TIM輸出比較極性高
-
- TIM_OC1Init(TIM3, &TIM_OCInitStructure); //根據TIM_OCInitStruct中指定的參數初始化外設TIMx
- TIM_OC2Init(TIM3, &TIM_OCInitStructure); //根據TIM_OCInitStruct中指定的參數初始化外設TIMx
-
- TIM_CtrlPWMOutputs(TIM3,ENABLE); //MOE 主輸出使能
- TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); //CH1預裝載使能
- TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //CH1預裝載使能
-
- TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIMx在ARR上的預裝載寄存器
-
- 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(); //電機驅動引腳初始化
- while(1)
- {
- STBY = 1;
-
- AIN1 = 1;
- AIN2 = 0;
-
- BIN1 = 1;
- BIN2 = 0;
-
- TIM_SetCompare1(TIM3,88);
- TIM_SetCompare2(TIM3,50);
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