Diff: hal/mbed_us_ticker_api.c

Revision:

0:5b88d5760320

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hal/mbed_us_ticker_api.c	Tue Dec 17 23:23:45 2019 +0000
@@ -0,0 +1,112 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2015 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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 <stddef.h>
+#include "platform/mbed_atomic.h"
+#include "hal/us_ticker_api.h"
+
+#if DEVICE_USTICKER
+
+static ticker_event_queue_t events = { 0 };
+
+static ticker_irq_handler_type irq_handler = ticker_irq_handler;
+
+#if MBED_CONF_TARGET_INIT_US_TICKER_AT_BOOT
+
+// If we are initializing at boot, we want the timer to be
+// always-on, so we block any attempt to free it. We do need
+// to pass through init(), as that needs to reset pending
+// interrupts.
+static void block_us_ticker_free()
+{
+}
+
+#else // MBED_CONF_TARGET_INIT_US_TICKER_AT_BOOT
+
+bool _us_ticker_initialized;
+
+// If we are not initializing at boot, we want to track
+// whether the timer has been initialized. This permits
+// a fast path for wait_us.
+static void note_us_ticker_init()
+{
+    us_ticker_init();
+    core_util_atomic_store_bool(&_us_ticker_initialized, true);
+}
+
+static void note_us_ticker_free()
+{
+    core_util_atomic_store_bool(&_us_ticker_initialized, false);
+    us_ticker_free();
+}
+
+#endif // MBED_CONF_TARGET_INIT_US_TICKER_AT_BOOT
+
+static const ticker_interface_t us_interface = {
+#if MBED_CONF_TARGET_INIT_US_TICKER_AT_BOOT
+    .init = us_ticker_init,
+#else
+    .init = note_us_ticker_init,
+#endif
+    .read = us_ticker_read,
+    .disable_interrupt = us_ticker_disable_interrupt,
+    .clear_interrupt = us_ticker_clear_interrupt,
+    .set_interrupt = us_ticker_set_interrupt,
+    .fire_interrupt = us_ticker_fire_interrupt,
+    .get_info = us_ticker_get_info,
+#if MBED_CONF_TARGET_INIT_US_TICKER_AT_BOOT
+    .free = block_us_ticker_free,
+#else
+    .free = note_us_ticker_free,
+#endif
+    .runs_in_deep_sleep = false,
+};
+
+static const ticker_data_t us_data = {
+    .interface = &us_interface,
+    .queue = &events
+};
+
+const ticker_data_t *get_us_ticker_data(void)
+{
+    return &us_data;
+}
+
+ticker_irq_handler_type set_us_ticker_irq_handler(ticker_irq_handler_type ticker_irq_handler)
+{
+    ticker_irq_handler_type prev_irq_handler = irq_handler;
+
+    irq_handler = ticker_irq_handler;
+
+    return prev_irq_handler;
+}
+
+void us_ticker_irq_handler(void)
+{
+    if (irq_handler) {
+        irq_handler(&us_data);
+    }
+}
+
+#else
+
+const ticker_data_t *get_us_ticker_data(void)
+{
+    return NULL;
+}
+
+#endif  // DEVICE_USTICKER