有问题版本，暂存

inc/ultrasonic_analog.h

@@ -0,0 +1,43 @@
+//
+// Created by yelv1 on 24-12-31.
+//
+
+#ifndef ULTRASONIC_ANALOG_H
+#define ULTRASONIC_ANALOG_H
+
+#include "gd32e23x.h"
+#include "systick.h"
+#include "gd32e23x_libopt.h"
+#include "board_config.h"
+#include "usart.h"
+#include "fwdgt.h"
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+
+extern volatile bool ultrasonicMeasurementDone;
+
+/******************************************************************************/
+
+#define ULTRASONIC_TX_CYCLES        0x05U
+#define ULTRASONIC_TX_TIME          498  // (ms)
+
+/******************************************************************************/
+
+void ultrasonic_gpio_config(void);
+
+void ultrasonic_pwm_out_cycles(const uint8_t cycles);
+
+void ultrasonic_transmit_delay(const uint16_t micro_second);
+
+void ultrasonic_rece_exti_config(void);
+
+void ultrasonic_echo_timer_config(void);
+
+void ultrasonic_config(void);
+
+uint32_t ultrasonic_calc_distance(void);
+
+
+#endif //ULTRASONIC_ANALOG_H