Diff: events/equeue/equeue_mbed.cpp

Revision:

0:f782d9c66c49

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/events/equeue/equeue_mbed.cpp	Fri Feb 02 05:42:23 2018 +0000
@@ -0,0 +1,154 @@
+/*
+ * Implementation for the mbed library
+ * https://github.com/mbedmicro/mbed
+ *
+ * Copyright (c) 2016 Christopher Haster
+ *
+ * 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.
+ */
+#include "equeue/equeue_platform.h"
+
+#if defined(EQUEUE_PLATFORM_MBED)
+
+#include <stdbool.h>
+#include "mbed.h"
+
+
+// Ticker operations
+static bool equeue_tick_inited = false;
+static volatile unsigned equeue_minutes = 0;
+static unsigned equeue_timer[
+        (sizeof(Timer)+sizeof(unsigned)-1)/sizeof(unsigned)];
+static unsigned equeue_ticker[
+        (sizeof(Ticker)+sizeof(unsigned)-1)/sizeof(unsigned)];
+
+static void equeue_tick_update() {
+    equeue_minutes += reinterpret_cast<Timer*>(equeue_timer)->read_ms();
+    reinterpret_cast<Timer*>(equeue_timer)->reset();
+}
+
+static void equeue_tick_init() {
+    MBED_STATIC_ASSERT(sizeof(equeue_timer) >= sizeof(Timer),
+            "The equeue_timer buffer must fit the class Timer");
+    MBED_STATIC_ASSERT(sizeof(equeue_ticker) >= sizeof(Ticker),
+            "The equeue_ticker buffer must fit the class Ticker");
+    new (equeue_timer) Timer;
+    new (equeue_ticker) Ticker;
+
+    equeue_minutes = 0;
+    reinterpret_cast<Timer*>(equeue_timer)->start();
+    reinterpret_cast<Ticker*>(equeue_ticker)
+            ->attach_us(equeue_tick_update, 1000 << 16);
+
+    equeue_tick_inited = true;
+}
+
+unsigned equeue_tick() {
+    if (!equeue_tick_inited) {
+        equeue_tick_init();
+    }
+
+    unsigned minutes;
+    unsigned ms;
+
+    do {
+        minutes = equeue_minutes;
+        ms = reinterpret_cast<Timer*>(equeue_timer)->read_ms();
+    } while (minutes != equeue_minutes);
+
+    return minutes + ms;
+}
+
+
+// Mutex operations
+int equeue_mutex_create(equeue_mutex_t *m) { return 0; }
+void equeue_mutex_destroy(equeue_mutex_t *m) { }
+
+void equeue_mutex_lock(equeue_mutex_t *m) {
+    core_util_critical_section_enter();
+}
+
+void equeue_mutex_unlock(equeue_mutex_t *m) {
+    core_util_critical_section_exit();
+}
+
+
+// Semaphore operations
+#ifdef MBED_CONF_RTOS_PRESENT
+
+int equeue_sema_create(equeue_sema_t *s) {
+    MBED_STATIC_ASSERT(sizeof(equeue_sema_t) >= sizeof(Semaphore),
+            "The equeue_sema_t must fit the class Semaphore");
+    new (s) Semaphore(0);
+    return 0;
+}
+
+void equeue_sema_destroy(equeue_sema_t *s) {
+    reinterpret_cast<Semaphore*>(s)->~Semaphore();
+}
+
+void equeue_sema_signal(equeue_sema_t *s) {
+    reinterpret_cast<Semaphore*>(s)->release();
+}
+
+bool equeue_sema_wait(equeue_sema_t *s, int ms) {
+    if (ms < 0) {
+        ms = osWaitForever;
+    }
+
+    return (reinterpret_cast<Semaphore*>(s)->wait(ms) > 0);
+}
+
+#else
+
+// Semaphore operations
+int equeue_sema_create(equeue_sema_t *s) {
+    *s = false;
+    return 0;
+}
+
+void equeue_sema_destroy(equeue_sema_t *s) {
+}
+
+void equeue_sema_signal(equeue_sema_t *s) {
+    *s = 1;
+}
+
+static void equeue_sema_timeout(equeue_sema_t *s) {
+    *s = -1;
+}
+
+bool equeue_sema_wait(equeue_sema_t *s, int ms) {
+    int signal = 0;
+    Timeout timeout;
+    if (ms > 0) {
+        timeout.attach_us(callback(equeue_sema_timeout, s), ms*1000);
+    }
+
+    core_util_critical_section_enter();
+    while (!*s) {
+        sleep();
+        core_util_critical_section_exit();
+        core_util_critical_section_enter();
+    }
+
+    signal = *s;
+    *s = false;
+    core_util_critical_section_exit();
+
+    return (signal > 0);
+}
+
+#endif
+
+#endif