Stm32f10c8t6控制电机以50%占空比转动,按下按键使电机以50%-100%-0%-50% 循环;
时间: 2023-08-22 10:04:34 浏览: 33
好的,针对您的问题,我可以给出以下的思路:
1. 配置STM32的定时器,使其能够输出PWM波形,并且能够控制占空比。
2. 配置STM32的外部中断,使其能够检测按键的状态变化。
3. 在中断服务函数中,根据按键的状态变化,改变PWM输出的占空比。
具体实现步骤如下:
1. 配置定时器,使其能够输出PWM波形。这里以TIM2为例,具体代码如下:
```c
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_OCInitTypeDef TIM_OCInitStruct;
void PWM_init()
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseInitStruct.TIM_Period = 999;
TIM_TimeBaseInitStruct.TIM_Prescaler = 71;
TIM_TimeBaseInitStruct.TIM_ClockDivision = 0;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_Pulse = 500;
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStruct.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStruct.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStruct.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC1Init(TIM2, &TIM_OCInitStruct);
TIM_Cmd(TIM2, ENABLE);
}
```
这里的定时器时钟频率为72MHz,PWM的频率为72MHz / (999+1) / (71+1) = 1kHz,占空比的设置范围为0~999,占空比为50%时,对应的是500。
2. 配置外部中断,使其能够检测按键的状态变化。这里以GPIOA的第0个引脚为例,具体代码如下:
```c
EXTI_InitTypeDef EXTI_InitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
NVIC_InitTypeDef NVIC_InitStruct;
void EXTI_init()
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
EXTI_InitStruct.EXTI_Line = EXTI_Line0;
EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStruct.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStruct);
NVIC_InitStruct.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
}
void EXTI0_IRQHandler()
{
static uint16_t duty_cycle = 500;
if (EXTI_GetITStatus(EXTI_Line0) != RESET)
{
EXTI_ClearITPendingBit(EXTI_Line0);
if (duty_cycle == 500)
{
duty_cycle = 1000;
}
else if (duty_cycle == 1000)
{
duty_cycle = 0;
}
else
{
duty_cycle = 500;
}
TIM_SetCompare1(TIM2, duty_cycle);
}
}
```
当按键状态变化时,会进入EXTI0_IRQHandler函数中,在这里根据当前的占空比状态,改变PWM输出的占空比。
3. 最后在main函数中调用PWM_init和EXTI_init函数即可。
以上就是基本的实现思路,希望对您有所帮助。