73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
/* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==============================================================================*/
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// Reference implementation of timer functions. Platforms are not required to
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// implement these timer methods, but they are required to enable profiling.
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// On platforms that have a POSIX stack or C library, it can be written using
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// methods from <sys/time.h> or clock() from <time.h>.
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// To add an equivalent function for your own platform, create your own
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// implementation file, and place it in a subfolder with named after the OS
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// you're targeting. For example, see the Cortex M bare metal version in
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// tensorflow/lite/micro/bluepill/micro_timer.cc or the mbed one on
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// tensorflow/lite/micro/mbed/micro_timer.cc.
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#include "tensorflow/lite/micro/micro_time.h"
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// These are headers from Ambiq's Apollo3 SDK.
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#include "am_bsp.h" // NOLINT
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#include "am_mcu_apollo.h" // NOLINT
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#include "am_util.h" // NOLINT
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namespace tflite {
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namespace {
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// Select CTIMER 1 as benchmarking timer on Sparkfun Edge. This timer must not
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// be used elsewhere.
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constexpr int kTimerNum = 1;
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// Clock set to operate at 12MHz.
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constexpr int kClocksPerSecond = 12e6;
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} // namespace
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int32_t ticks_per_second() { return kClocksPerSecond; }
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// Calling this method enables a timer that runs for eternity. The user is
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// responsible for avoiding trampling on this timer's config, otherwise timing
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// measurements may no longer be valid.
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int32_t GetCurrentTimeTicks() {
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// TODO(b/150808076): Split out initialization, intialize in interpreter.
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static bool is_initialized = false;
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if (!is_initialized) {
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am_hal_ctimer_config_t timer_config;
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// Operate as a 32-bit timer.
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timer_config.ui32Link = 1;
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// Set timer A to continuous mode at 12MHz.
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timer_config.ui32TimerAConfig =
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AM_HAL_CTIMER_FN_CONTINUOUS | AM_HAL_CTIMER_HFRC_12MHZ;
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am_hal_ctimer_stop(kTimerNum, AM_HAL_CTIMER_BOTH);
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am_hal_ctimer_clear(kTimerNum, AM_HAL_CTIMER_BOTH);
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am_hal_ctimer_config(kTimerNum, &timer_config);
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am_hal_ctimer_start(kTimerNum, AM_HAL_CTIMER_TIMERA);
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is_initialized = true;
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}
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return CTIMERn(kTimerNum)->TMR0;
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}
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} // namespace tflite
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