feat: 移植 lwprintf

project/src/by_debug.c

@@ -0,0 +1,23 @@
+#include "by_debug.h"
+
+#include "at32f403a_407.h"
+#include "lwprintf.h"
+
+int lwprintf_out(int ch, lwprintf_t *lwp)
+{
+
+    /* May use printf to output it for test */
+
+    if (ch != '\0') {
+        while (usart_flag_get(BY_DEBUG_USART_INDEX, USART_TDC_FLAG) == RESET)
+            ;
+        usart_data_transmit(BY_DEBUG_USART_INDEX, (char)ch);
+    }
+
+    return ch;
+}
+
+void by_debug_init(void)
+{
+    lwprintf_init(lwprintf_out);
+}