普通的超声波模块的数据读取

刘俊 · 发表于 2014-6-25 13:43:44

[mw_shl_code=c,true]/*main.c*/ #include"sys.h" #include"delay.h" #include"usart.h" #include"gpio.h" #include"count.h" u32 H,L; u8 flag; u32 count,sum; int main() { Stm32_Clock_Init(9); delay_init(72); uart_init(72,9600); TIM2_Cap_Init(0xffff,499,1); //500us计数一次 GPIO_Init(); Trig=0; while(1) { Trig=1; delay_us(20); Trig=0; TIM2->CCER&=~(1<<1); if(TIM2->SR&0x02) //捕获上升沿 { count=TIM2->CCR1; // printf("UP\r\n"); } TIM2->CCER|=1<<1; //捕获下降沿 if(TIM2->SR&0x02) { count=TIM2->CCR1; //记录在下降沿时捕获寄存器的值 // printf("%ld\r\n",count); // printf("DOWN\r\n\r\n"); } printf("%ld\r\n",count); TIM2->CNT=0; //清除CNT和CCR1的值 TIM2->CCR1=0; // TIM2->SR&=~(1<<0); } } /*count.c*/ /******************************************************************************/ /***************************输入捕获配置***************************************/ /******************************************************************************/ #include"sys.h" #include"delay.h" #include"usart.h" #include"count.h" void TIM2_Init(u16 arr) { RCC->APB1ENR|=1<<0; RCC->APB2ENR|=1<<2; TIM2->ARR=arr; GPIOA->CRL&=0xfff00000; GPIOA->CRL|=0x00038888; GPIOA->ODR&=~(1<<0); //下拉输入 //必须改正 GPIOA->ODR&=~(1<<1); GPIOA->ODR&=~(1<<2); GPIOA->ODR|=1<<3; TIM2->CCMR1|=1<<0; TIM2->CCMR1&=0xffffff3f; TIM2->CCMR1|=0x00000030; TIM2->CCER&=~(1<<1); //捕获上升沿 TIM2->CCMR1&=0xfffffff3; TIM2->CCER|=1<<0; TIM2->DIER|=1<<1; //允许捕获中断 TIM2->DIER|=1<<0; //允许更新中断 TIM2->CR1|=1<<0; TIM2->CR2|=1<<7; //这样可以使用CH1~CH3通道,CH4没办法用,PA0,PA1均可用 MY_NVIC_Init(1,3,TIM2_IRQn,2); } void TIM3_Init(u16 arr,u16 psc) //作为计时器 { RCC->APB1ENR|=1<<1; TIM3->ARR=arr; //装初值 TIM3->

SC=psc; TIM3->DIER|=1<<0; // TIM3->CR1|=1<<0; MY_NVIC_Init(1,3,TIM3_IRQn,2); } void TIM2_Cap_Init(u16 arr,u16 psc,u16 way) { RCC->APB1ENR|=1<<0; //TIM1时钟使能 RCC->APB2ENR|=1<<2; //开启PA时钟 TIM2->ARR=arr; //设定计数器自动重装值 TIM2->

SC=psc; //预分频器设置 switch(way) { case 1: GPIOA->CRL&=0xfffffff0; GPIOA->CRL|=0x00000008; break; case 2: GPIOA->CRL&=0xffffff00; GPIOA->CRL|=0x00000088; break; case 3: GPIOA->CRL&=0xfffff000; GPIOA->CRL|=0x00000888; break; case 4: GPIOA->CRL&=0xffff0000; GPIOA->CRL|=0x00008888; break; } switch(way) { case 1: TIM2->CCMR1|=1<<0; //IC1映射到TI1上 TIM2->CCMR1|=1<<4; //采样频率 TIM2->CCER&=~(1<<1); //上升沿捕获 TIM2->CCER|=1<<0; //通道1 捕获使能 break; case 2: TIM2->CCMR1|=1<<8; //CH1 PWM2模式 TIM2->CCMR1|=1<<12; TIM2->CCER&=~(1<<5); //开启通道 TIM2->CCER|=1<<4; //MOE 主输出使能 break; case 3: TIM2->CCMR2|=1<<0; //CH1 PWM2模式 TIM2->CCMR2|=1<<4; TIM2->CCER&=~(1<<9); //开启通道 TIM2->CCER|=1<<8; //MOE 主输出使能 break; case 4: TIM2->CCMR2|=1<<8; //CH1 PWM2模式 TIM2->CCMR2|=1<<12; TIM2->CCER&=~(1<<13); //开启通道 TIM2->CCER|=1<<12; //MOE 主输出使能 break; } TIM2->DIER|=1<<0; TIM2->DIER|=1<<1; TIM2->CR1|=1<<0; TIM2->CR1|=1<<7; } /*count.h*/ #ifndef COUNT_H #define COUNT_H #include"sys.h" void TIM3_Init(u16 arr,u16 psc); void TIM2_Init(u16 arr); void TIM2_Cap_Init(u16 arr,u16 psc,u16 way); #endif /*gpio.c*/ #include"gpio.h" void GPIO_Init() { RCC->APB2ENR|=1<<3; GPIOB->CRL&=0xfffff000; GPIOB->CRL|=0x00000333; GPIOB->ODR|=1<<0; // GPIOB->ODR|=1<<0; // GPIOB->ODR|=1<<0; } /*gpio.h*/ #ifndef GPIO_H #define GPIO_H #include"sys.h" #define Trig PBout(0) //#define Echo PBin(1) void GPIO_Init(void); #endif [/mw_shl_code]

以前配置的，现在拿出来一起分享