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component/common/mbed/targets/hal/rtl8711b/us_ticker_api.c

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+/* 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.
+ */
+#include <stddef.h>
+#include "us_ticker_api.h"
+#include "cmsis.h"
+
+static ticker_event_handler event_handler;
+static ticker_event_t *head = NULL;
+
+void us_ticker_set_handler(ticker_event_handler handler)
+{
+	us_ticker_init();
+
+	event_handler = handler;
+}
+
+void us_ticker_irq_handler(void)
+{
+	us_ticker_clear_interrupt();
+
+	/* Go through all the pending TimerEvents */
+	while (1) {
+		if (head == NULL) {
+			/*  There are no more TimerEvents left, so disable matches. */
+			us_ticker_disable_interrupt();
+			return;
+		}
+
+		if ((int)(head->timestamp - us_ticker_read()) <= 0) {
+			/* This event was in the past: point to the following one and execute its handler */
+			ticker_event_t *p = head;
+			head = head->next;
+			if (event_handler != NULL) {
+				event_handler(p->id); // NOTE: the handler can set new events
+			}
+			/* Note: We continue back to examining the head because calling the */
+			/* event handler may have altered the chain of pending events. */
+		} else {
+			/* This event and the following ones in the list are in the future: set it as next interrupt and return */ 
+			us_ticker_set_interrupt(head->timestamp);
+			return;
+		}
+	}
+}
+
+void us_ticker_insert_event(ticker_event_t *obj, timestamp_t timestamp, uint32_t id)
+{
+	/* disable interrupts for the duration of the function */
+	__disable_irq();
+
+	/*  initialise our data */
+	obj->timestamp = timestamp;
+	obj->id = id;
+
+	/* Go through the list until we either reach the end, or find */
+	/* an element this should come before (which is possibly the head). */
+	ticker_event_t *prev = NULL, *p = head;
+	while (p != NULL) {
+		/* check if we come before p */
+		if ((int)(timestamp - p->timestamp) <= 0) {
+			break;
+		}
+		/* go to the next element */
+		prev = p;
+		p = p->next;
+	}
+	/* if prev is NULL we're at the head */
+	if (prev == NULL) {
+		head = obj;
+		us_ticker_set_interrupt(timestamp);
+	} else {
+		prev->next = obj;
+	}
+	/* if we're at the end p will be NULL, which is correct */
+	obj->next = p;
+
+	__enable_irq();
+}
+
+void us_ticker_remove_event(ticker_event_t *obj)
+{
+	__disable_irq();
+
+	/* remove this object from the list */
+	if (head == obj) {
+		/*  first in the list, so just drop me */
+		head = obj->next;
+		if (head == NULL) {
+			us_ticker_disable_interrupt();
+		} else {
+			us_ticker_set_interrupt(head->timestamp);
+		}
+	} else {
+		/* find the object before me, then drop me */
+		ticker_event_t* p = head;
+		while (p != NULL) {
+			if (p->next == obj) {
+				p->next = obj->next;
+				break;
+			}
+			p = p->next;
+		}
+	}
+
+	__enable_irq();
+}