esp-idf/components/esp32s2/clk.c

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C
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// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdint.h>
#include <sys/param.h>
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#include "esp_attr.h"
#include "soc/rtc.h"
#include "esp32s2/clk.h"
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#define MHZ (1000000)
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// g_ticks_us defined in ROMs
extern uint32_t g_ticks_per_us_pro;
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int IRAM_ATTR esp_clk_cpu_freq(void)
{
return g_ticks_per_us_pro * MHZ;
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}
int IRAM_ATTR esp_clk_apb_freq(void)
{
return MIN(g_ticks_per_us_pro, 80) * MHZ;
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}
int IRAM_ATTR esp_clk_xtal_freq(void)
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{
return rtc_clk_xtal_freq_get() * MHZ;
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}
void IRAM_ATTR ets_update_cpu_frequency(uint32_t ticks_per_us)
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{
/* Update scale factors used by esp_rom_delay_us */
g_ticks_per_us_pro = ticks_per_us;
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}