mirror of https://github.com/ARMmbed/mbed-os.git
119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2017 ARM Limited
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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/**
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* @addtogroup hal_sleep
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* @{
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* @defgroup hal_sleep_test_util Tests
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* Tests of the sleep HAL.
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* @{
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*/
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#ifndef MBED_SLEEP_TEST_UTILS_H
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#define MBED_SLEEP_TEST_UTILS_H
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#include "hal/ticker_api.h"
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#include "hal/us_ticker_api.h"
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#include "hal/lp_ticker_api.h"
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/* Flush serial buffer before deep sleep
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*
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* Since deepsleep() may shut down the UART peripheral, we wait for some time
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* to allow for hardware serial buffers to completely flush.
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*
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* Take NUMAKER_PFM_NUC472 as an example:
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* Its UART peripheral has 16-byte Tx FIFO. With baud rate set to 9600, flush
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* Tx FIFO would take: 16 * 8 * 1000 / 9600 = 13.3 (ms). So set wait time to
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* 20ms here for safe.
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*
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* This should be replaced with a better function that checks if the
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* hardware buffers are empty. However, such an API does not exist now,
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* so we'll use the busy_wait_ms() function for now.
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*/
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#define SERIAL_FLUSH_TIME_MS 20
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#define US_PER_S 1000000
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unsigned int ticks_to_us(unsigned int ticks, unsigned int freq)
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{
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return (unsigned int)((unsigned long long) ticks * US_PER_S / freq);
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}
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unsigned int us_to_ticks(unsigned int us, unsigned int freq)
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{
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return (unsigned int)((unsigned long long) us * freq / US_PER_S);
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}
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unsigned int overflow_protect(unsigned int timestamp, unsigned int ticker_width)
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{
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unsigned int counter_mask = ((1 << ticker_width) - 1);
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return (timestamp & counter_mask);
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}
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bool compare_timestamps(unsigned int delta_ticks, unsigned int ticker_width, unsigned int expected, unsigned int actual)
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{
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const unsigned int counter_mask = ((1 << ticker_width) - 1);
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const unsigned int lower_bound = ((expected - delta_ticks) & counter_mask);
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const unsigned int upper_bound = ((expected + delta_ticks) & counter_mask);
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if (lower_bound < upper_bound) {
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if (actual >= lower_bound && actual <= upper_bound) {
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return true;
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} else {
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return false;
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}
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} else {
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if ((actual >= lower_bound && actual <= counter_mask) || (actual >= 0 && actual <= upper_bound)) {
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return true;
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} else {
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return false;
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}
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}
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}
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void busy_wait_ms(int ms)
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{
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const ticker_info_t *info = us_ticker_get_info();
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uint32_t mask = (1 << info->bits) - 1;
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int delay = (int)((uint64_t) ms * info->frequency / 1000);
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uint32_t prev = us_ticker_read();
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while (delay > 0) {
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uint32_t next = us_ticker_read();
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delay -= (next - prev) & mask;
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prev = next;
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}
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}
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void us_ticker_isr(const ticker_data_t *const ticker_data)
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{
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us_ticker_clear_interrupt();
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}
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#if DEVICE_LPTICKER
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void lp_ticker_isr(const ticker_data_t *const ticker_data)
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{
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lp_ticker_clear_interrupt();
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}
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#endif
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#endif
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/** @}*/
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/** @}*/
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