基于STM32F103C8T6的超声波模块使用代码
时间: 2024-05-05 10:21:17 浏览: 71
以下是基于STM32F103C8T6的超声波模块使用代码:
```
#include "stm32f10x.h"
#define TRIG_PIN GPIO_Pin_15
#define ECHO_PIN GPIO_Pin_14
void delay_us(uint32_t us)
{
uint32_t i;
for(i=0; i<us*8; i++);
}
void HC_SR04_Init(void)
{
GPIO_InitTypeDef gpio_init_struct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
gpio_init_struct.GPIO_Pin = TRIG_PIN;
gpio_init_struct.GPIO_Mode = GPIO_Mode_Out_PP;
gpio_init_struct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &gpio_init_struct);
gpio_init_struct.GPIO_Pin = ECHO_PIN;
gpio_init_struct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &gpio_init_struct);
}
float HC_SR04_GetDistance(void)
{
uint32_t time_us;
float distance;
GPIO_SetBits(GPIOB, TRIG_PIN);
delay_us(10);
GPIO_ResetBits(GPIOB, TRIG_PIN);
while(!GPIO_ReadInputDataBit(GPIOB, ECHO_PIN));
while(GPIO_ReadInputDataBit(GPIOB, ECHO_PIN));
time_us = TIM_GetCounter(TIM2);
distance = (float)time_us / 58.0f;
return distance;
}
int main(void)
{
HC_SR04_Init();
while(1)
{
float distance = HC_SR04_GetDistance();
printf("Distance: %.2f cm\r\n", distance);
delay_us(1000000);
}
}
```
在这段代码中,我们使用了 STM32F10x 的库函数,通过 GPIO 控制超声波模块的 TRIG 和 ECHO 引脚,以及通过定时器 TIM2 计算出声波往返的时间,最终计算出距离。注意使用时需要连接好超声波模块的 TRIG 和 ECHO 引脚,并根据实际情况修改代码中的引脚号。
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