From 6afbb90f1d87f0692cce4ff3f378401830535779 Mon Sep 17 00:00:00 2001
From: self-confident neko <45762837+muaxiaohei@users.noreply.github.com>
Date: Wed, 14 Jun 2023 14:48:15 +0800
Subject: [PATCH] Add files via upload

---
 .../Libraries/ch32_drivers/drv_common.c       | 28 +++++++++++++++++++
 .../Libraries/ch32_drivers/drv_common.h       | 25 +++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 bsp/wch/risc-v/Libraries/ch32_drivers/drv_common.c
 create mode 100644 bsp/wch/risc-v/Libraries/ch32_drivers/drv_common.h

diff --git a/bsp/wch/risc-v/Libraries/ch32_drivers/drv_common.c b/bsp/wch/risc-v/Libraries/ch32_drivers/drv_common.c
new file mode 100644
index 00000000000..79145ea9398
--- /dev/null
+++ b/bsp/wch/risc-v/Libraries/ch32_drivers/drv_common.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2023-06-14     muaxiaohei   first version
+ */
+
+#include <rtthread.h>
+#include "drv_common.h"
+
+void rt_hw_us_delay(rt_uint32_t us)
+{
+    uint64_t total_delay_ticks, us_ticks, start, now, delta, reload;
+
+    start = SysTick->CNT;
+    reload = SysTick->CMP;
+    us_ticks = SystemCoreClock / 8000000UL;
+    total_delay_ticks = (uint32_t)us * us_ticks;
+    RT_ASSERT(total_delay_ticks < reload);
+
+    do{
+        now = SysTick->CNT;
+        delta = start > now ? start - now : reload + start - now;
+    }while(delta < total_delay_ticks);
+}
diff --git a/bsp/wch/risc-v/Libraries/ch32_drivers/drv_common.h b/bsp/wch/risc-v/Libraries/ch32_drivers/drv_common.h
new file mode 100644
index 00000000000..df9bed27948
--- /dev/null
+++ b/bsp/wch/risc-v/Libraries/ch32_drivers/drv_common.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2023-06-14     muaxiaohei   first version
+ */
+
+#ifndef __DRV_COMMON_H__
+#define __DRV_COMMON_H__
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void rt_hw_us_delay(rt_uint32_t us);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif