release dev branch

Src/gd32e23x_it.c

@@ -34,6 +34,9 @@ OF SUCH DAMAGE.
 
 #include "gd32e23x_it.h"
 #include "systick.h"
+#include "uart.h"
+#include "uart_ring_buffer.h"
+#include "led.h"
 
 /*!
     \brief      this function handles NMI exception
@@ -93,7 +96,14 @@ void PendSV_Handler(void)
     \param[out] none
     \retval     none
 */
-void SysTick_Handler(void)
-{
+void SysTick_Handler(void) {
+    led_heart_beat();  // LED心跳指示灯
     delay_decrement();
 }
+
+void USART0_IRQHandler(void) {
+    if (RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_RBNE)) {
+        uint8_t data = usart_data_receive(USART0);
+        (void)uart_ring_buffer_put(data); // 缓冲满时丢弃，返回值可用于统计
+    }
+}