mirror of
https://github.com/espressif/esp-idf.git
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142 lines
4.0 KiB
C
142 lines
4.0 KiB
C
// Copyright 2015-2017 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 <stdint.h>
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#include <sys/param.h>
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#include <sys/lock.h>
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#include "esp_attr.h"
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#include "soc/rtc.h"
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#if CONFIG_IDF_TARGET_ESP32
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#include "esp32/rom/rtc.h"
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#include "esp32/clk.h"
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#include "esp32/rtc.h"
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#elif CONFIG_IDF_TARGET_ESP32S2
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#include "esp32s2/rom/rtc.h"
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#include "esp32s2/clk.h"
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#include "esp32s2/rtc.h"
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#elif CONFIG_IDF_TARGET_ESP32S3
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#include "esp32s3/rom/rtc.h"
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#include "esp32s3/clk.h"
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#include "esp32s3/rtc.h"
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#include "esp32s3/rom/ets_sys.h"
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#elif CONFIG_IDF_TARGET_ESP32C3
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#include "esp32c3/rom/rtc.h"
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#include "esp32c3/clk.h"
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#include "esp32c3/rtc.h"
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#endif
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#define MHZ (1000000)
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// g_ticks_us defined in ROMs for PRO and APP CPU
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extern uint32_t g_ticks_per_us_pro;
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#if CONFIG_IDF_TARGET_ESP32
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#ifndef CONFIG_FREERTOS_UNICORE
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extern uint32_t g_ticks_per_us_app;
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#endif
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#endif
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static _lock_t s_esp_rtc_time_lock;
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static RTC_DATA_ATTR uint64_t s_esp_rtc_time_us = 0, s_rtc_last_ticks = 0;
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inline static int IRAM_ATTR s_get_cpu_freq_mhz(void)
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{
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#if CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
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return ets_get_cpu_frequency();
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#else
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return g_ticks_per_us_pro;
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#endif
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}
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int IRAM_ATTR esp_clk_cpu_freq(void)
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{
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return s_get_cpu_freq_mhz() * MHZ;
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}
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int IRAM_ATTR esp_clk_apb_freq(void)
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{
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return MIN(s_get_cpu_freq_mhz(), 80) * MHZ;
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}
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int IRAM_ATTR esp_clk_xtal_freq(void)
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{
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return rtc_clk_xtal_freq_get() * MHZ;
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}
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#ifndef CONFIG_IDF_TARGET_ESP32C3
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void IRAM_ATTR ets_update_cpu_frequency(uint32_t ticks_per_us)
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{
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/* Update scale factors used by esp_rom_delay_us */
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g_ticks_per_us_pro = ticks_per_us;
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#if CONFIG_IDF_TARGET_ESP32
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#ifndef CONFIG_FREERTOS_UNICORE
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g_ticks_per_us_app = ticks_per_us;
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#endif
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#endif
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}
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#endif
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uint64_t esp_rtc_get_time_us(void)
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{
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_lock_acquire(&s_esp_rtc_time_lock);
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const uint32_t cal = esp_clk_slowclk_cal_get();
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const uint64_t rtc_this_ticks = rtc_time_get();
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const uint64_t ticks = rtc_this_ticks - s_rtc_last_ticks;
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/* RTC counter result is up to 2^48, calibration factor is up to 2^24,
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* for a 32kHz clock. We need to calculate (assuming no overflow):
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* (ticks * cal) >> RTC_CLK_CAL_FRACT
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*
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* An overflow in the (ticks * cal) multiplication would cause time to
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* wrap around after approximately 13 days, which is probably not enough
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* for some applications.
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* Therefore multiplication is split into two terms, for the lower 32-bit
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* and the upper 16-bit parts of "ticks", i.e.:
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* ((ticks_low + 2^32 * ticks_high) * cal) >> RTC_CLK_CAL_FRACT
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*/
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const uint64_t ticks_low = ticks & UINT32_MAX;
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const uint64_t ticks_high = ticks >> 32;
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const uint64_t delta_time_us = ((ticks_low * cal) >> RTC_CLK_CAL_FRACT) +
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((ticks_high * cal) << (32 - RTC_CLK_CAL_FRACT));
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s_esp_rtc_time_us += delta_time_us;
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s_rtc_last_ticks = rtc_this_ticks;
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_lock_release(&s_esp_rtc_time_lock);
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return s_esp_rtc_time_us;
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}
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void esp_clk_slowclk_cal_set(uint32_t new_cal)
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{
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#if defined(CONFIG_ESP_TIME_FUNCS_USE_RTC_TIMER)
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/* To force monotonic time values even when clock calibration value changes,
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* we adjust esp_rtc_time
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*/
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esp_rtc_get_time_us();
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#endif // CONFIG_ESP_TIME_FUNCS_USE_RTC_TIMER
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REG_WRITE(RTC_SLOW_CLK_CAL_REG, new_cal);
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}
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uint32_t esp_clk_slowclk_cal_get(void)
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{
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return REG_READ(RTC_SLOW_CLK_CAL_REG);
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}
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uint64_t esp_clk_rtc_time(void)
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{
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#ifdef CONFIG_ESP_TIME_FUNCS_USE_RTC_TIMER
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return esp_rtc_get_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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