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https://github.com/espressif/esp-idf.git
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6fb996b1ac
Spinlocks from spinlock.h do not disable the scheduler and thus cannot safely be directly used as a locking mechanism. A task holding the lock can get pre-empted, and at that point the new running task will also be allowed to take the spinlock and access whatever it was protecting. Another issue is that the task holding a spinlock could migrate to a different core which in turn would cause the application to fail asserts. The current implementation assumes the core that takes the lock is also the core that releases it. Closes https://github.com/espressif/esp-idf/issues/5762
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
// Copyright 2020 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 "esp_system.h"
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#include "esp_attr.h"
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#include "soc/rtc.h"
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#include "freertos/FreeRTOS.h"
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#include "sdkconfig.h"
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#if CONFIG_IDF_TARGET_ESP32
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#include "esp32/rtc.h"
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#elif CONFIG_IDF_TARGET_ESP32S2
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#include "esp32s2/rtc.h"
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#endif
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#include "esp_private/startup_internal.h"
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// A component in the build should provide strong implementations that make use of
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// and actual hardware timer to provide timekeeping functions.
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int64_t IRAM_ATTR __attribute__((weak)) esp_system_get_time(void)
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{
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int64_t t = 0;
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t = (esp_rtc_get_time_us() - g_startup_time);
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return t;
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}
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uint32_t IRAM_ATTR __attribute__((weak)) esp_system_get_time_resolution(void)
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{
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return 1000000L / rtc_clk_slow_freq_get_hz();
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} |