lib/cmsis_rtos_v1: Implement support for osDelay

This API is used to specify delay in ms. This is analogous
to k_sleep in the kernel.

Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>

lib/cmsis_rtos_v1/CMakeLists.txt

diff --git a/lib/cmsis_rtos_v1/CMakeLists.txt b/lib/cmsis_rtos_v1/CMakeLists.txt
index 4a1fdc4..c99aca6 100644
--- a/lib/cmsis_rtos_v1/CMakeLists.txt
+++ b/lib/cmsis_rtos_v1/CMakeLists.txt
@@ -4,7 +4,11 @@
 target_include_directories(CMSIS INTERFACE ${PROJECT_SOURCE_DIR}/include/cmsis_rtos_v1)
 
 zephyr_library()
-zephyr_library_sources_ifdef(CONFIG_CMSIS_RTOS_V1	cmsis_thread.c)
+zephyr_library_sources_ifdef(
+  CONFIG_CMSIS_RTOS_V1
+  cmsis_thread.c
+  cmsis_wait.c
+)
 
 zephyr_library_link_libraries(CMSIS)
 target_link_libraries(CMSIS INTERFACE zephyr_interface)

lib/cmsis_rtos_v1/cmsis_wait.c

diff --git a/lib/cmsis_rtos_v1/cmsis_wait.c b/lib/cmsis_rtos_v1/cmsis_wait.c
new file mode 100644
index 0000000..deefa22
--- /dev/null
+++ b/lib/cmsis_rtos_v1/cmsis_wait.c
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2018 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <kernel_structs.h>
+#include <cmsis_os.h>
+
+/**
+ * @brief Wait for Timeout (Time Delay in ms).
+ */
+osStatus osDelay(uint32_t delay_ms)
+{
+	if (_is_in_isr()) {
+		return osErrorISR;
+	}
+
+	k_sleep(delay_ms);
+	return osEventTimeout;
+}