- #include "pwm.h"
- #include "led.h"
- //PWM輸出初始化
- //arr：自動重裝值
- //psc：時鐘預分頻數
- 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外設時鐘使能
-
- //設置該引腳為復用輸出功能,輸出TIM1 CH1的PWM脈沖波形
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH1
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復用推挽輸出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
-
- TIM_TimeBaseStructure.TIM_Period = arr; //設置在下一個更新事件裝入活動的自動重裝載寄存器周期的值 80K
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //設置用來作為TIMx時鐘頻率除數的預分頻值 不分頻
- TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設置時鐘分割:TDTS = Tck_tim
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數模式
- TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根據TIM_TimeBaseInitStruct中指定的參數初始化TIMx的時間基數單位
-
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時器模式:TIM脈沖寬度調制模式2
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
- TIM_OCInitStructure.TIM_Pulse = 0; //設置待裝入捕獲比較寄存器的脈沖值
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //輸出極性:TIM輸出比較極性高
- TIM_OC1Init(TIM1, &TIM_OCInitStructure); //根據TIM_OCInitStruct中指定的參數初始化外設TIMx
- TIM_CtrlPWMOutputs(TIM1,ENABLE); //MOE 主輸出使能
- TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //CH1預裝載使能
-
- TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的預裝載寄存器
-
- 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;//舵機連接pA8 0-180(1925-1740) max-min(1999- )
- int main(void)
- {
-
- KEY_Init();
- delay_init(); //延時函數初始化
- LED_Init(); //初始化與LED連接的硬件接口
- TIM1_PWM_Init(1999,719); //PWM頻率===(2000*720)/72000000=0.02=20ms
- while(1)
- {
- if(key1==0) //key1按下，舵機正向轉動至135度
- {
-
- delay_ms(5);
- cout=1925;
- }
- else if(key2==0) //key2按下，舵機正向轉動至90度
- {
- delay_ms(5);
- cout=1750;
- }
- else
- cout=1850;
- TIM_SetCompare1(TIM1,cout); //PWM輸出
- delay_ms(50);
-
- }
-
- }
Keil代碼下載:
STM32_PWM控制一路舵機.7z
(281 KB, 下載次數: 38)
2022-4-3 02:26 上傳
點擊文件名下載附件
下載積分: 黑幣 -5
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