32小车为何有个轮不受PWM波影响

#include "pwm.h"

// TIM2_PWM输出初始化
// TIM2_CH3 = PA2
// TIM2_CH4 = PA3

// TIM2_Reload_Num = TIM2自动重装值
// TIM2_Frequency_Divide = 时钟预分频数
//-----------------------------------------------------------------------------------------------------------------
void TIM2_PWM_Init_JX(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);			// 使能TIM2时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  			// 使能GPIOA时钟

// 配置IO模式

//设置该引脚为复用输出功能,输出TIM2 CH3,TIM2 CH4的PWM脉冲波形
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // 复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//初始化TIM4的计数模式、分频值、重装载值等
TIM_TimeBaseStructure.TIM_Period = 99; 			// 设置下一个更新事件后，装入自动重装载寄存器的值
TIM_TimeBaseStructure.TIM_Prescaler =719; 	// 设置TIM4时钟预分频值 
TIM_TimeBaseStructure.TIM_ClockDivision = 0; 					// 设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 	// 向上计数模式
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); 				// 根据参数初始化TIM2的计数方式


//初始化TIM2_CH1-4的PWM
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; 				// 选择定时器模式:TIM脉冲宽度调制模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 	// 比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 		// 输出极性:TIM输出比较极性高
TIM_OCInitStructure.TIM_Pulse=50;
TIM_OC3Init(TIM5, &TIM_OCInitStructure);

TIM_OC3PreloadConfig(TIM5, TIM_OCPreload_Enable); // 使能TIM4在OC1上的预装载寄存器

TIM_OCInitStructure.TIM_Pulse=50;
TIM_OC4Init(TIM5, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM5, TIM_OCPreload_Enable);				// 使能TIM4在OC2上的预装载寄存器

TIM_Cmd(TIM5, ENABLE);											// 使能TIM2

}
//-----------------------------------------------------------------------------------------------------------------
// TIM4_PWM输出初始化
// TIM4_CH1 = PB6
// TIM4_CH2 = PB7

// TIM4_Reload_Num = TIM1自动重装值
// TIM4_Frequency_Divide = 时钟预分频数
//-----------------------------------------------------------------------------------------------------------------
void TIM3_PWM_Init_JX(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);			// 使能TIM2时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  			// 使能GPIOA时钟

// 配置IO模式  
//设置该引脚为复用输出功能,输出TIM4 CH1,TIM4 CH2的PWM脉冲波形
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  				// 复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);							


//初始化TIM4的计数模式、分频值、重装载值等
TIM_TimeBaseStructure.TIM_Period = 99; 			// 设置下一个更新事件后，装入自动重装载寄存器的值
TIM_TimeBaseStructure.TIM_Prescaler =719; 	// 设置TIM4时钟预分频值 
TIM_TimeBaseStructure.TIM_ClockDivision = 0; 					// 设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 	// 向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); 				// 根据参数初始化TIM2的计数方式


//初始化TIM2_CH1-4的PWM
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; 				// 选择定时器模式:TIM脉冲宽度调制模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 	// 比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 		// 输出极性:TIM输出比较极性高
TIM_OCInitStructure.TIM_Pulse=50;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);

TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); // 使能TIM4在OC1上的预装载寄存器

TIM_OCInitStructure.TIM_Pulse=50;
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);				// 使能TIM4在OC2上的预装载寄存器

TIM_Cmd(TIM3, ENABLE);											// 使能TIM2

}
//-----------------------------------------------------------------------------------------------------------------