Diff: platform/mbed_wait_api_rtos.cpp

Revision:

149:156823d33999

diff -r 21d94c44109e -r 156823d33999 platform/mbed_wait_api_rtos.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/platform/mbed_wait_api_rtos.cpp	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,50 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// This implementation of the wait functions will be compiled only
+// if the RTOS is present.
+#ifdef MBED_CONF_RTOS_PRESENT
+
+#include "platform/wait_api.h"
+#include "hal/us_ticker_api.h"
+#include "rtos/rtos.h"
+#include "platform/critical.h"
+
+void wait(float s) {
+    wait_us(s * 1000000.0f);
+}
+
+void wait_ms(int ms) {
+    wait_us(ms * 1000);
+}
+
+void wait_us(int us) {
+    uint32_t start = us_ticker_read();
+    // Use the RTOS to wait for millisecond delays if possible
+    int ms = us / 1000;
+    if ((ms > 0) && core_util_are_interrupts_enabled()) {
+        Thread::wait((uint32_t)ms);
+        us -= ms * 1000;
+    }
+    // Use busy waiting for sub-millisecond delays, or for the whole
+    // interval if interrupts are not enabled
+    if (us > 0) {
+        while((us_ticker_read() - start) < (uint32_t)us);
+    }
+}
+
+#endif // #if MBED_CONF_RTOS_PRESENT
+