Initial commit

src/main.c

@@ -0,0 +1,46 @@
+/*!
+    \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 "peripheral.h"
+
+/*!
+    \brief      main function
+    \param[in]  none
+    \param[out] none
+    \retval     none
+*/
+int main(void)
+{
+    /* configure systick */
+    systick_config();
+    usart_config();
+    led_blink_config();
+
+    delay_ms(5000);
+    printf("system start!\r\n");
+
+    while(1){
+    printf("hello world!\r\n");
+    delay_ms(5000);
+    }
+}
+
+/* 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;
+}