initial commit with fimware code of avr-projects

1 files changed, 50 insertions, 0 deletions

diff --git a/firmware/eventqueue.c b/firmware/eventqueue.c
new file mode 100644
index 0000000..40f1f21
--- /dev/null
+++ b/firmware/eventqueue.c
@@ -0,0 +1,50 @@
+/*
+ *  spreadspace avr projects
+ *
+ *
+ *  Copyright (C) 2013-2015 Christian Pointner <equinox@spreadspace.org>
+ *
+ *  This file is part of spreadspace avr projects.
+ *
+ *  spreadspace avr projects 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
+ *  any later version.
+ *
+ *  spreadspace avr projects 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 spreadspace avr projects. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <LUFA/Drivers/Misc/RingBuffer.h>
+#include "eventqueue.h"
+
+static RingBuffer_t event_queue;
+static uint8_t event_queue_data[16];
+
+void eventqueue_init(void)
+{
+  RingBuffer_InitBuffer(&event_queue, event_queue_data, sizeof(event_queue_data));
+}
+
+uint8_t eventqueue_pop(uint8_t* key, uint8_t* state)
+{
+  if (RingBuffer_IsEmpty(&event_queue))
+    return 0;
+
+  uint8_t event = RingBuffer_Remove(&event_queue);
+  *state = (event & 0x80) ? 1 : 0;
+  *key = event & 0x7F;
+  return 1;
+}
+
+void eventqueue_push(uint8_t key, uint8_t state)
+{
+  uint8_t event = (state) ? 0x80 : 0;
+  event |= (key & 0x7F);
+  RingBuffer_Insert(&event_queue, event);
+}