通用定时器pwm驱动电机
时间: 2023-10-30 13:05:44 浏览: 38
通用定时器(TIM)可以用来产生PWM信号,从而驱动电机。以下是一个使用STM32 HAL库的示例代码:
```c
#include "stm32f4xx_hal.h"
TIM_HandleTypeDef htim3;
void MX_TIM3_Init(void)
{
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
htim3.Instance = TIM3;
htim3.Init.Prescaler = 0;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 9999;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_PWM_Init(&htim3);
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig);
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1);
}
void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef* tim_pwmHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(tim_pwmHandle->Instance==TIM3)
{
__HAL_RCC_TIM3_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();
/**TIM3 GPIO Configuration
PC6 ------> TIM3_CH1
*/
GPIO_InitStruct.Pin = GPIO_PIN_6;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF2_TIM3;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
}
}
void HAL_TIM_PWM_MspDeInit(TIM_HandleTypeDef* tim_pwmHandle)
{
if(tim_pwmHandle->Instance==TIM3)
{
__HAL_RCC_TIM3_CLK_DISABLE();
/**TIM3 GPIO Configuration
PC6 ------> TIM3_CH1
*/
HAL_GPIO_DeInit(GPIOC, GPIO_PIN_6);
}
}
int main(void)
{
HAL_Init();
MX_TIM3_Init();
HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_1);
while (1)
{
for (int i = 0; i < 10000; i++) {
__HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_1, i);
HAL_Delay(1);
}
for (int i = 10000; i > 0; i--) {
__HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_1, i);
HAL_Delay(1);
}
}
}
```
在这个例子中,我们使用TIM3的通道1来产生PWM信号。MX_TIM3_Init函数用来初始化TIM3,并将通道1配置为PWM输出模式。在main函数中,我们通过调用`HAL_TIM_PWM_Start`函数来启动TIM3的PWM输出。在无限循环中,我们使用`__HAL_TIM_SET_COMPARE`函数来改变PWM输出的占空比,从而驱动电机。本例中,我们将PWM占空比从0逐渐增加到100%(10000),然后再逐渐减小到0,然后再从0开始循环。
需要注意的是,在使用PWM驱动电机时,需要根据电机的特性选择合适的PWM频率和占空比。同时,还需要考虑驱动电机的电源和保护电路。