Merge pull request #19837 from HendrikVE/stdio_uart_add_flush_rx

sys/stdio_uart: add stdio_clear_stdin

sys/include/stdio_base.h

@@ -102,6 +102,15 @@ void stdio_init(void);
 int stdio_available(void);
 #endif
 
+/**
+ * @brief   Clear the input buffer
+ *
+ * @note    Requires 'USEMODULE += stdin'
+ *
+ * @warning This function does only work if the stdio implementation supports it.
+ */
+void stdio_clear_stdin(void);
+
 /**
  * @brief read @p len bytes from stdio uart into @p buffer
  *

sys/stdio/stdio.c

@@ -81,3 +81,10 @@ int stdio_available(void)
     return tsrb_avail(&stdin_isrpipe.tsrb);
 }
 #endif
+
+void stdio_clear_stdin(void)
+{
+    if (IS_USED(MODULE_STDIN)) {
+        tsrb_clear(&stdin_isrpipe.tsrb);
+    }
+}