From dd2fb48232fd8680bc5728bc5602f4429aa1ee51 Mon Sep 17 00:00:00 2001
From: mculover666 <2412828003@qq.com>
Date: Fri, 17 Jul 2020 10:44:48 +0800
Subject: [PATCH] fix a bug in cmsis-os v1.02 implement

---
 osal/cmsis_os/cmsis_os.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/osal/cmsis_os/cmsis_os.c b/osal/cmsis_os/cmsis_os.c
index d2d5f0d9..ade04fe0 100644
--- a/osal/cmsis_os/cmsis_os.c
+++ b/osal/cmsis_os/cmsis_os.c
@@ -122,6 +122,17 @@ osStatus osThreadSetPriority(osThreadId thread_id, osPriority priority)
     return errno_knl2cmsis(tos_task_prio_change((k_task_t *)thread_id, priority_cmsis2knl(priority)));
 }
 
+/**
+ * @brief Pass control to next thread that is in state READY.
+ * @return status code that indicates the execution status of the function.
+ */
+osStatus osThreadYield(void)
+{
+    tos_task_yield();
+    
+    return osOK;
+}
+
 /**
  * @brief Get current priority of an active thread.
  * @param[in]   thread_id   thread ID obtained by \ref osThreadCreate or \ref osThreadGetId.