From 911360c0e8683f9d61c023d844e961dddfd353ea Mon Sep 17 00:00:00 2001
From: Gatsby Van <mail.gatsby.icu>
Date: Wed, 24 Jan 2024 10:53:17 +0800
Subject: [PATCH] bugfix: avoid NONE value after startup.

---
 df_datalink_sp/src/system_monitor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/df_datalink_sp/src/system_monitor.c b/df_datalink_sp/src/system_monitor.c
index 7399e56..41f1271 100644
--- a/df_datalink_sp/src/system_monitor.c
+++ b/df_datalink_sp/src/system_monitor.c
@@ -56,7 +56,7 @@ inline uint8_t GetWritable(PINGPONG ctrllor)
 inline uint8_t GetReadable(PINGPONG ctrllor)
 {
 	if (ctrllor.wBusy == BUFF_NONE || ctrllor.wBusy != ctrllor.latest)
-		return ctrllor.latest;
+		return ((ctrllor.latest == BUFF_NONE) ? BUFF_A : BUFF_B);
 	else
 		return ((ctrllor.wBusy == BUFF_B) ? BUFF_A : BUFF_B);
 }