STM32 MINI板输出PWM给电调，控制四轴的无刷电机的代码 -

#include "led.h"
#include "delay.h"
#include "sys.h"
#include "pwm.h"
#include "key.h"
#include "lcd.h"
int main(void)
{
u16 led0pwmval=0;
u8 dir=1;
u8 buff[10];
delay_init(); //延时函数初始化
LCD_Init();
LED_Init(); //初始化与LED连接的硬件接口
TIM1_PWM_Init(199,7199);//PMW初始化，使用PA9，TMI-CH2通道输出PMW
KEY_Init();
led0pwmval=9;
POINT_COLOR=RED;//设置字体为红色
LCD_ShowString(60,50,200,16,16,"power instruction ");
LCD_ShowString(60,70,200,16,16,"10 is the min");
LCD_ShowString(60,90,200,16,16,"20 is the max");
while(1)
{
LED0=0;
delay_ms(50);
dir=KEY_Scan(1);
switch(dir)
{
case KEY0_PRES:
led0pwmval--;
if(led0pwmval<10)led0pwmval=9;
break;
case KEY1_PRES:
led0pwmval++;
if(led0pwmval>20)led0pwmval=20;
break;
case WKUP_PRES:
led0pwmval =9;
break;
default:
delay_ms(10);
}
TIM_SetCompare2(TIM1,led0pwmval);
sprintf(buff,"current power is %d ",led0pwmval);
LCD_ShowString(60,110,200,16,16,buff);//显示读到的字符串
LED0 =1;
delay_ms(50);
}
}

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#include "pwm.h"
#include "led.h"
//PWM输出初始化
//arr：自动重装值
//psc：时钟预分频数
void TIM1_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE); //使能GPIO外设时钟使能
//设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //TIM_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 80K
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值不分频
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OC2Init(TIM1, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
TIM_CtrlPWMOutputs(TIM1,ENABLE); //MOE 主输出使能
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable); //CH1预装载使能
TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
TIM_Cmd(TIM1, ENABLE); //使能TIM1
}

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