ST M32 控制电机速度的代码

以下是基于ST M32的PWM控制电机速度的示例代码：

#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_tim.h"

#define PERIOD_VALUE	1000  // PWM周期

void GPIO_Config(void);
void TIM_Config(void);

int main(void)
{
	GPIO_Config();
	TIM_Config();

	while (1)
	{
	}
}

void GPIO_Config(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;

	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_Init(GPIOA, &GPIO_InitStructure);

	GPIO_PinAFConfig(GPIOA, GPIO_PinSource0, GPIO_AF_TIM2);
}

void TIM_Config(void)
{
	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
	TIM_OCInitTypeDef TIM_OCInitStructure;

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

	TIM_TimeBaseStructure.TIM_Period = PERIOD_VALUE - 1;
	TIM_TimeBaseStructure.TIM_Prescaler = 84 - 1;   // 设置时钟预分频，84MHz/84=1MHz
	TIM_TimeBaseStructure.TIM_ClockDivision = 0;
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OCInitStructure.TIM_Pulse = 0;
	TIM_OC1Init(TIM2, &TIM_OCInitStructure);

	TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);

	TIM_ARRPreloadConfig(TIM2, ENABLE);

	TIM_Cmd(TIM2, ENABLE);
}

在上面的代码中，定时器2被用来发出PWM信号。我们设置了一个1000的周期，并使用了一个84分频器来将时钟分为1MHz。这意味着PWM频率为1kHz。GPIOA Pin0（PA0）被配置为替代功能，以使其与定时器2的通道1相关联。TIM_OCMode_PWM1用于设置PWM模式，即在高电平时间内产生矩形波。TIM_OCInitStructure.TIM_Pulse用于设置占空比。在上面的示例中，占空比为0，因此电机不会运转。可以通过调整该值来改变电机的速度。