写一个基于stm 32zet6的超声波距离检测程序
时间: 2023-05-24 14:01:10 浏览: 53
好的,以下是一个基于STM32ZET6的超声波距离检测程序:
```c
#include "stm32zet6.h"
#define TRIG_PIN GPIO_Pin_0
#define ECHO_PIN GPIO_Pin_1
#define SPEED_OF_SOUND 34300 // m/s at 20°C
void delay_us(uint32_t us) {
uint32_t count = us * 6;
while(count--) {
asm("nop");
}
}
float get_distance() {
float distance;
// Send the trigger pulse
GPIO_SetBits(GPIOA, TRIG_PIN);
delay_us(10);
GPIO_ResetBits(GPIOA, TRIG_PIN);
// Wait for the echo pulse to start
while(!GPIO_ReadInputDataBit(GPIOA, ECHO_PIN));
// Measure the duration of the echo pulse
uint32_t pulse_start = SysTick->VAL;
while(GPIO_ReadInputDataBit(GPIOA, ECHO_PIN));
uint32_t pulse_end = SysTick->VAL;
// Calculate the distance based on the duration of the echo pulse
uint32_t pulse_duration = pulse_end > pulse_start ? pulse_end - pulse_start : pulse_start - pulse_end;
distance = ((float)pulse_duration / (float)SystemCoreClock) * SPEED_OF_SOUND / 2.0;
return distance;
}
int main() {
// Initialize the system clock
SystemInit();
// Enable the GPIOA clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// Configure the TRIG and ECHO pins
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_StructInit(&GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin = TRIG_PIN;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin = ECHO_PIN;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
GPIO_Init(GPIOA, &GPIO_InitStruct);
// Configure the SysTick timer
SysTick_Config(SystemCoreClock / 1000000);
while(1) {
// Get the distance and print it to the console
float distance = get_distance();
printf("Distance: %.2f m\n", distance);
// Wait for 1 second
delay_us(1000000);
}
}
```
这个程序采用了触发-测量方式来检测距离。首先通过控制GPIOA的第0个引脚发送一个10us的高电平脉冲,从而触发超声波模块发射一次超声波。然后等待GPIOA的第1个引脚输出高电平,表示接收到了超声波的回波。记录下超声波回波的时刻,并计算出回波持续的时间,据此可以计算出目标物体与超声波模块之间的距离。