STM32F103C8T6用keil5写超声波传感器的代码

以下是一个简单的超声波传感器代码示例，使用STM32F103C8T6和Keil5编写：

#include "stm32f10x.h"

#define TRIG_PIN GPIO_Pin_0
#define ECHO_PIN GPIO_Pin_1
#define TRIG_PORT GPIOA
#define ECHO_PORT GPIOA

void delay_us(uint32_t us) {
uint32_t i;
for (i = 0; i < us * 8; i++) {
__NOP();
}
}

void init_gpio() {
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = TRIG_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(TRIG_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = ECHO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(ECHO_PORT, &GPIO_InitStructure);
}

float measure_distance() {
uint32_t start_time, end_time;
float distance;

GPIO_ResetBits(TRIG_PORT, TRIG_PIN);
delay_us(2);
GPIO_SetBits(TRIG_PORT, TRIG_PIN);
delay_us(10);
GPIO_ResetBits(TRIG_PORT, TRIG_PIN);

while (GPIO_ReadInputDataBit(ECHO_PORT, ECHO_PIN) == RESET);
start_time = TIM2->CNT;

while (GPIO_ReadInputDataBit(ECHO_PORT, ECHO_PIN) == SET);
end_time = TIM2->CNT;

distance = (float)(end_time - start_time) / 58.0f;

return distance;
}

int main() {
init_gpio();

while (1) {
float distance = measure_distance();
// do something with distance
}
}

请注意，这只是一个简单的示例代码，您需要根据您的具体应用程序进行修改和调整。