212 lines
6.2 KiB
C
212 lines
6.2 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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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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#include <errno.h>
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#include <stdlib.h>
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#include <time.h>
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#include <reent.h>
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#include <sys/types.h>
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#include <sys/reent.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include <sys/lock.h>
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#include "esp_attr.h"
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#include "esp_intr_alloc.h"
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#include "soc/soc.h"
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#include "soc/rtc_cntl_reg.h"
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#include "soc/frc_timer_reg.h"
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#include "rom/ets_sys.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/xtensa_api.h"
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#include "freertos/task.h"
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#include "sdkconfig.h"
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#if defined( CONFIG_ESP32_TIME_SYSCALL_USE_RTC ) || defined( CONFIG_ESP32_TIME_SYSCALL_USE_RTC_FRC1 )
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#define WITH_RTC 1
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#endif
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#if defined( CONFIG_ESP32_TIME_SYSCALL_USE_FRC1 ) || defined( CONFIG_ESP32_TIME_SYSCALL_USE_RTC_FRC1 )
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#define WITH_FRC1 1
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#endif
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#ifdef WITH_RTC
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static uint64_t get_rtc_time_us()
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{
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SET_PERI_REG_MASK(RTC_CNTL_TIME_UPDATE_REG, RTC_CNTL_TIME_UPDATE_M);
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while (GET_PERI_REG_MASK(RTC_CNTL_TIME_UPDATE_REG, RTC_CNTL_TIME_VALID_M) == 0) {
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;
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}
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CLEAR_PERI_REG_MASK(RTC_CNTL_TIME_UPDATE_REG, RTC_CNTL_TIME_UPDATE_M);
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uint64_t low = READ_PERI_REG(RTC_CNTL_TIME0_REG);
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uint64_t high = READ_PERI_REG(RTC_CNTL_TIME1_REG);
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uint64_t ticks = (high << 32) | low;
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return ticks * 100 / (RTC_CTNL_SLOWCLK_FREQ / 10000); // scale RTC_CTNL_SLOWCLK_FREQ to avoid overflow
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}
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#endif // WITH_RTC
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// s_boot_time: time from Epoch to the first boot time
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#ifdef WITH_RTC
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static RTC_DATA_ATTR struct timeval s_boot_time;
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#elif defined(WITH_FRC1)
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static struct timeval s_boot_time;
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#endif
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#if defined(WITH_RTC) || defined(WITH_FRC1)
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static _lock_t s_boot_time_lock;
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#endif
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#ifdef WITH_FRC1
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#define FRC1_PRESCALER 16
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#define FRC1_PRESCALER_CTL 2
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#define FRC1_TICK_FREQ (APB_CLK_FREQ / FRC1_PRESCALER)
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#define FRC1_TICKS_PER_US (FRC1_TICK_FREQ / 1000000)
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#define FRC1_ISR_PERIOD_US (FRC_TIMER_LOAD_VALUE(0) / FRC1_TICKS_PER_US)
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// Counter frequency will be APB_CLK_FREQ / 16 = 5 MHz
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// 1 tick = 0.2 us
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// Timer has 23 bit counter, so interrupt will fire each 1677721.6 microseconds.
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// This is not a whole number, so timer will drift by 0.3 ppm due to rounding error.
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static volatile uint64_t s_microseconds = 0;
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static void IRAM_ATTR frc_timer_isr()
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{
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WRITE_PERI_REG(FRC_TIMER_INT_REG(0), FRC_TIMER_INT_CLR);
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s_microseconds += FRC1_ISR_PERIOD_US;
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}
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#endif // WITH_FRC1
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void esp_setup_time_syscalls()
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{
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#if defined( WITH_FRC1 )
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#if defined( WITH_RTC )
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// initialize time from RTC clock
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s_microseconds = get_rtc_time_us();
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#endif //WITH_RTC
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// set up timer
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WRITE_PERI_REG(FRC_TIMER_CTRL_REG(0), \
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FRC_TIMER_AUTOLOAD | \
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(FRC1_PRESCALER_CTL << FRC_TIMER_PRESCALER_S) | \
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FRC_TIMER_EDGE_INT);
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WRITE_PERI_REG(FRC_TIMER_LOAD_REG(0), FRC_TIMER_LOAD_VALUE(0));
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SET_PERI_REG_MASK(FRC_TIMER_CTRL_REG(0),
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FRC_TIMER_ENABLE | \
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FRC_TIMER_INT_ENABLE);
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esp_intr_alloc(ETS_TIMER1_INTR_SOURCE, 0, &frc_timer_isr, NULL, NULL);
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#endif // WITH_FRC1
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}
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clock_t IRAM_ATTR _times_r(struct _reent *r, struct tms *ptms)
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{
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clock_t t = xTaskGetTickCount() * (portTICK_PERIOD_MS * CLK_TCK / 1000);
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ptms->tms_cstime = 0;
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ptms->tms_cutime = 0;
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ptms->tms_stime = t;
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ptms->tms_utime = 0;
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struct timeval tv = {0, 0};
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_gettimeofday_r(r, &tv, NULL);
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return (clock_t) tv.tv_sec;
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}
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#if defined( WITH_FRC1 ) || defined( WITH_RTC )
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static uint64_t get_time_since_boot()
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{
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uint64_t microseconds = 0;
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#ifdef WITH_FRC1
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uint32_t timer_ticks_before = READ_PERI_REG(FRC_TIMER_COUNT_REG(0));
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microseconds = s_microseconds;
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uint32_t timer_ticks_after = READ_PERI_REG(FRC_TIMER_COUNT_REG(0));
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if (timer_ticks_after > timer_ticks_before) {
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// overflow happened at some point between getting
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// timer_ticks_before and timer_ticks_after
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// microseconds value is ambiguous, get a new one
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microseconds = s_microseconds;
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}
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microseconds += (FRC_TIMER_LOAD_VALUE(0) - timer_ticks_after) / FRC1_TICKS_PER_US;
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#elif defined(WITH_RTC)
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microseconds = get_rtc_time_us();
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#endif
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return microseconds;
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}
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#endif // defined( WITH_FRC1 ) || defined( WITH_RTC )
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int IRAM_ATTR _gettimeofday_r(struct _reent *r, struct timeval *tv, void *tz)
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{
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(void) tz;
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#if defined( WITH_FRC1 ) || defined( WITH_RTC )
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uint64_t microseconds = get_time_since_boot();
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if (tv) {
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_lock_acquire(&s_boot_time_lock);
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microseconds += s_boot_time.tv_usec;
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tv->tv_sec = s_boot_time.tv_sec + microseconds / 1000000;
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tv->tv_usec = microseconds % 1000000;
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_lock_release(&s_boot_time_lock);
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}
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return 0;
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#else
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__errno_r(r) = ENOSYS;
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return -1;
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#endif // defined( WITH_FRC1 ) || defined( WITH_RTC )
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}
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int settimeofday(const struct timeval *tv, const struct timezone *tz)
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{
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(void) tz;
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#if defined( WITH_FRC1 ) || defined( WITH_RTC )
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if (tv) {
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_lock_acquire(&s_boot_time_lock);
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uint64_t now = ((uint64_t) tv->tv_sec) * 1000000LL + tv->tv_usec;
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uint64_t since_boot = get_time_since_boot();
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uint64_t boot_time = now - since_boot;
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s_boot_time.tv_sec = boot_time / 1000000;
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s_boot_time.tv_usec = boot_time % 1000000;
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_lock_release(&s_boot_time_lock);
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}
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return 0;
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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uint32_t system_get_time(void)
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{
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#if defined( WITH_FRC1 ) || defined( WITH_RTC )
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return get_time_since_boot();
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#else
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return 0;
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#endif
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}
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uint32_t system_get_current_time(void) __attribute__((alias("system_get_time")));
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uint32_t system_relative_time(uint32_t current_time)
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{
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return system_get_time() - current_time;
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}
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uint64_t system_get_rtc_time(void)
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{
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#ifdef WITH_RTC
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return get_rtc_time_us();
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#else
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return 0;
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#endif
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}
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