kopia lustrzana https://github.com/espressif/esp-idf
88 wiersze
3.1 KiB
C
88 wiersze
3.1 KiB
C
// Copyright 2015-2020 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 <stdbool.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include "esp32s2/rom/rtc.h"
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#include "esp_rom_uart.h"
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#include "soc/rtc.h"
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#include "soc/rtc_periph.h"
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#include "soc/sens_periph.h"
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#include "soc/efuse_periph.h"
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#include "soc/apb_ctrl_reg.h"
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#include "hal/cpu_hal.h"
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#include "regi2c_ctrl.h"
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#include "soc_log.h"
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#include "sdkconfig.h"
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#include "rtc_clk_common.h"
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static const char* TAG = "rtc_clk_init";
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void rtc_clk_init(rtc_clk_config_t cfg)
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{
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rtc_cpu_freq_config_t old_config, new_config;
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/* Set tuning parameters for 8M and 90k clocks.
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* Note: this doesn't attempt to set the clocks to precise frequencies.
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* Instead, we calibrate these clocks against XTAL frequency later, when necessary.
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* - SCK_DCAP value controls tuning of 90k clock.
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* The higher the value of DCAP is, the lower is the frequency.
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* - CK8M_DFREQ value controls tuning of 8M clock.
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* CLK_8M_DFREQ constant gives the best temperature characteristics.
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*/
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REG_SET_FIELD(RTC_CNTL_REG, RTC_CNTL_SCK_DCAP, cfg.slow_clk_dcap);
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REG_SET_FIELD(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_CK8M_DFREQ, cfg.clk_8m_dfreq);
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/* Configure 90k clock division */
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rtc_clk_divider_set(cfg.clk_rtc_clk_div);
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/* Configure 8M clock division */
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rtc_clk_8m_divider_set(cfg.clk_8m_clk_div);
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/* Enable the internal bus used to configure PLLs */
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SET_PERI_REG_BITS(ANA_CONFIG_REG, ANA_CONFIG_M, ANA_CONFIG_M, ANA_CONFIG_S);
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CLEAR_PERI_REG_MASK(ANA_CONFIG_REG, I2C_APLL_M | I2C_BBPLL_M);
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rtc_xtal_freq_t xtal_freq = cfg.xtal_freq;
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esp_rom_uart_tx_wait_idle(0);
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rtc_clk_xtal_freq_update(xtal_freq);
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rtc_clk_apb_freq_update(xtal_freq * MHZ);
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/* Set CPU frequency */
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rtc_clk_cpu_freq_get_config(&old_config);
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uint32_t freq_before = old_config.freq_mhz;
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bool res = rtc_clk_cpu_freq_mhz_to_config(cfg.cpu_freq_mhz, &new_config);
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if (!res) {
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SOC_LOGE(TAG, "invalid CPU frequency value");
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abort();
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}
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rtc_clk_cpu_freq_set_config(&new_config);
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/* Re-calculate the ccount to make time calculation correct. */
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cpu_hal_set_cycle_count( (uint64_t)cpu_hal_get_cycle_count() * cfg.cpu_freq_mhz / freq_before );
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/* Slow & fast clocks setup */
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if (cfg.slow_freq == RTC_SLOW_FREQ_32K_XTAL) {
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rtc_clk_32k_enable(true);
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}
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if (cfg.fast_freq == RTC_FAST_FREQ_8M) {
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bool need_8md256 = cfg.slow_freq == RTC_SLOW_FREQ_8MD256;
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rtc_clk_8m_enable(true, need_8md256);
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}
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rtc_clk_fast_freq_set(cfg.fast_freq);
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rtc_clk_slow_freq_set(cfg.slow_freq);
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}
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