1 files changed, 50 insertions, 0 deletions
diff --git a/android/WALT/app/src/main/jni/sync_clock.h b/android/WALT/app/src/main/jni/sync_clock.h
new file mode 100644
index 0000000..862bb7d
--- /dev/null
+++ b/android/WALT/app/src/main/jni/sync_clock.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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 <inttypes.h>
+
+#define CLOCK_BUFFER_LENGTH 512
+
+// Commands, original definitions in TensyUSB side code.
+#define CMD_RESET               'F' // Reset all vars
+#define CMD_SYNC_SEND           'I' // Send some digits for clock sync
+#define CMD_SYNC_READOUT        'R' // Read out sync times
+#define CMD_SYNC_ZERO           'Z' // Initial zero
+
+
+struct clock_connection {
+    int fd;
+    int endpoint_in;
+    int endpoint_out;
+    int64_t t_base;
+    char buffer[CLOCK_BUFFER_LENGTH];
+    int minE;
+    int maxE;
+};
+
+
+// Returns microseconds elapsed since boot
+int64_t uptimeMicros();
+
+// Returns microseconds elapsed since last clock sync
+int micros(struct clock_connection *clk);
+
+// Runs clock synchronization logic
+void sync_clocks(struct clock_connection *clk);
+
+// Run the sync logic without changing clocks, used for estimating clock drift
+void update_bounds(struct clock_connection *clk);
+