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/*
* 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);
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