- #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_8; //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_OC1Init(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_OC1PreloadConfig(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
-
-
- }
- #include "led.h"
- #include "delay.h"
- #include "sys.h"
- #include "pwm.h"
- #include "key.h"
- #define key1 PEin(3)
- #define key2 PEin(4)
- u16 cout;//舵机连接pA8 0-180(1925-1740) max-min(1999- )
- int main(void)
- {
-
- KEY_Init();
- delay_init(); //延时函数初始化
- LED_Init(); //初始化与LED连接的硬件接口
- TIM1_PWM_Init(1999,719); //PWM频率===(2000*720)/72000000=0.02=20ms
- while(1)
- {
- if(key1==0) //key1按下，舵机正向转动至135度
- {
-
- delay_ms(5);
- cout=1925;
- }
- else if(key2==0) //key2按下，舵机正向转动至90度
- {
- delay_ms(5);
- cout=1750;
- }
- else
- cout=1850;
- TIM_SetCompare1(TIM1,cout); //PWM输出
- delay_ms(50);
-
- }
-
- }
Keil代码下载:
STM32_PWM控制一路舵机.7z
(281 KB, 下载次数: 35)
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