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楼主 |
发表于 2014-5-6 19:47:12
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测得电路如图，没看懂怎么导通的。H为固定的电平，pwm变化，初始化时两者都为高，转动时pwm为脉冲。软件中没有增加死去延时。。
软件的配置如下,没有加入多的延时
TIM3_PWM_off(void)//电机停止 H-H
{ GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin =(GPIO_Pin_6 | GPIO_Pin_7);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_SetBits(GPIOA,GPIO_Pin_6);//H1
GPIO_SetBits(GPIOA,GPIO_Pin_7);//H2
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
//PB0复用为TIM3的通道3
TIM_Cmd(TIM3,DISABLE);
GPIO_InitStructure.GPIO_Pin =(GPIO_Pin_0 |GPIO_Pin_1);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_0);//pwm1
GPIO_SetBits(GPIOB,GPIO_Pin_1);//pwm2
}
导通的函数
void TIM3_PWM_Init(void) //前进 H-PWM ，吸尘电机
{
CCR3_Val = 1530;
CCR4_Val = 1530;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin =(GPIO_Pin_6 | GPIO_Pin_7);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_SetBits(GPIOA,GPIO_Pin_6);
GPIO_SetBits(GPIOA,GPIO_Pin_7);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //PA6,PA7为高
//PB0，PB1为定时器的输出
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB| RCC_APB2Periph_AFIO, ENABLE);
// GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH2->PB5
/*GPIOB Configuration: TIM3 channel 1 and 2 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // 复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* PWM信号电平跳变值 */
// u16 CCR3_Val = 800;
// u16 CCR4_Val = 800;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 2350-1; //当定时器从0计数到999，即为1000次，为一个定时周期 ,900us
TIM_TimeBaseStructure.TIM_Prescaler = 72-1; //设置预分频：不预分频，即为1MHz
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分频系数：不分频
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel3 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //配置为PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR3_Val; //设置通道3的电平跳变值，输出另外一个占空比的PWM
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //当定时器计数值小于CCR1_Val时为H高电平
TIM_OC3Init(TIM3, &TIM_OCInitStructure); //使能通道3
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);
/* PWM1 Mode configuration: Channel4 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val; //设置通道4的电平跳变值，输出另外一个占空比的PWM
TIM_OC4Init(TIM3, &TIM_OCInitStructure); //使能通道4
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE); // 使能TIM3重载寄存器ARR
/* TIM3 enable counter */
TIM_Cmd(TIM3, ENABLE);
}
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发表于 2014-5-6 17:39:27
