谁能帮我看一下程序,可以用超声波控制小灯的亮灭,但不能驱动无刷电机,初始化都不行
单片机源程序如下:
- #include "led.h"
- #include "delay.h"
- #include "sys.h"
- #include "timer.h"
- #include "usart.h"
- #include "ceju.h"
- //接线说明echo-PA0;trig-PA1;vcc接5v
- //TM3使超声波每隔一秒发送,TM2输入捕获。
- float Distance;
- extern u8 TIM2CH1_CAPTURE_STA; //输入捕获状态
- extern u16 TIM2CH1_CAPTURE_VAL; //输入捕获值
- int main(void)
- {
- u32 temp=0;
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// 设置中断优先级分组2
- delay_init(); //延时函数初始化
- uart_init(9600); //9600
- LED_Init(); //初始化与LED连接的硬件接口
- GPIO_Config() ;
- //TIM3_Int_Init(1999,719); //一秒发送一次。4999*2,7199
- TIM3_Config(1999,719);
- TIM2_Cap_Init(0XFFFF,7199); //以10khz的频率计数
- TIM_SetCompare1(TIM3,120);
- TIM_SetCompare2(TIM3,120);
- ceju_Init();
- TIM_SetCompare1(TIM3,0);
- TIM_SetCompare2(TIM3,60);
- delay_ms(1500);
- delay_ms(1500);
- delay_ms(1500);
- delay_ms(1500);
- while(1)
- {
-
- if(TIM2CH1_CAPTURE_STA&0X80)//成功捕获到了一次高电平
- {
- temp=TIM2CH1_CAPTURE_STA&0X3F;
- temp*=65536; //溢出时间总和
- temp+=TIM2CH1_CAPTURE_VAL; //得到总的高电平时间
- Distance=temp*5*34*2/200.0;
- if(Distance>10)
- {
- TIM_SetCompare1(TIM3,135);
- TIM_SetCompare2(TIM3,135);
- }
- else
- {
- TIM_SetCompare1(TIM3,0);
- TIM_SetCompare2(TIM3,0);
- }
- //printf("distance:%f cm\r\n",Distance);
- TIM2CH1_CAPTURE_STA=0; //开启下一次捕获
- }
- }
- }
-
复制代码
所有资料51hei提供下载:
超声波捕获测距实验.rar
(292.14 KB, 下载次数: 8)
|