fix commit

src/main.c

@@ -0,0 +1,61 @@
+/*!
+    \file    main.c
+    \brief   led spark with systick, USART print and key example
+
+    \version 2024-02-22, V2.1.0, firmware for GD32E23x
+*/
+#include "main.h"
+#include <stdio.h>
+#include "gd32e23x.h"
+#include "systick.h"
+#include "gd32e23x_libopt.h"
+
+#include "usonic_driver.h"
+
+#define ULTRASONIC_CYCLES 0x05U
+
+/*!
+    \brief      main function
+    \param[in]  none
+    \param[out] none
+    \retval     none
+*/
+int main(void)
+{
+    /* configure systick */
+    systick_config();
+    /* configure ultrasonic board hardware */
+    ultrasonic_config();
+
+
+    /* ---------- debug start ---------- */
+
+
+
+
+
+    /* ---------- debug end ---------- */
+
+    printf("\r\n");
+    printf("START!\r\n");
+    printf("XLSW-3DP-UltraSonic Analog 300K!\r\n");
+    printf("\r\n");
+
+    while(1)
+    {
+        delay_ms(50);
+        ultrasonic_pwm_out_cycles(ULTRASONIC_CYCLES);
+        // printf("Send ultra sonic driver signal!\r\n");
+    }
+}
+
+/* retarget the C library printf function to the USART */
+int _write (int fd, char *pBuffer, int size)
+{
+    for (int i = 0; i < size; i++)
+    {
+        usart_data_transmit(USART0, (uint8_t)pBuffer[i]);
+        while(RESET == usart_flag_get(USART0, USART_FLAG_TBE));
+    }
+    return size;
+}