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-rw-r--r--quantum/midi/bytequeue/bytequeue.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/quantum/midi/bytequeue/bytequeue.c b/quantum/midi/bytequeue/bytequeue.c
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+++ b/quantum/midi/bytequeue/bytequeue.c
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+// this is a single reader [maybe multiple writer?] byte queue
+// Copyright 2008 Alex Norman
+// writen by Alex Norman
+//
+// This file is part of avr-bytequeue.
+//
+// avr-bytequeue is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-bytequeue is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-bytequeue. If not, see <http://www.gnu.org/licenses/>.
+
+#include "bytequeue.h"
+#include "interrupt_setting.h"
+
+void bytequeue_init(byteQueue_t* queue, uint8_t* dataArray, byteQueueIndex_t arrayLen) {
+ queue->length = arrayLen;
+ queue->data = dataArray;
+ queue->start = queue->end = 0;
+}
+
+bool bytequeue_enqueue(byteQueue_t* queue, uint8_t item) {
+ interrupt_setting_t setting = store_and_clear_interrupt();
+ // full
+ if (((queue->end + 1) % queue->length) == queue->start) {
+ restore_interrupt_setting(setting);
+ return false;
+ } else {
+ queue->data[queue->end] = item;
+ queue->end = (queue->end + 1) % queue->length;
+ restore_interrupt_setting(setting);
+ return true;
+ }
+}
+
+byteQueueIndex_t bytequeue_length(byteQueue_t* queue) {
+ byteQueueIndex_t len;
+ interrupt_setting_t setting = store_and_clear_interrupt();
+ if (queue->end >= queue->start)
+ len = queue->end - queue->start;
+ else
+ len = (queue->length - queue->start) + queue->end;
+ restore_interrupt_setting(setting);
+ return len;
+}
+
+// we don't need to avoid interrupts if there is only one reader
+uint8_t bytequeue_get(byteQueue_t* queue, byteQueueIndex_t index) {
+ return queue->data[(queue->start + index) % queue->length];
+}
+
+// we just update the start index to remove elements
+void bytequeue_remove(byteQueue_t* queue, byteQueueIndex_t numToRemove) {
+ interrupt_setting_t setting = store_and_clear_interrupt();
+ queue->start = (queue->start + numToRemove) % queue->length;
+ restore_interrupt_setting(setting);
+}