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75 lines
2.3 KiB
C
75 lines
2.3 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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// 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 "esp_attr.h"
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#include "rom/ets_sys.h"
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#include "rom/uart.h"
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#include "sdkconfig.h"
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#include "rtc.h"
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#include "soc/soc.h"
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#include "soc/rtc_cntl_reg.h"
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/*
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* This function is not exposed as an API at this point,
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* because FreeRTOS doesn't yet support dynamic changing of
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* CPU frequency. Also we need to implement hooks for
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* components which want to be notified of CPU frequency
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* changes.
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*/
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void esp_set_cpu_freq(void)
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{
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uint32_t freq_mhz = CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ;
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// freq will be changed to 40MHz in rtc_init_lite,
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// wait uart tx finish, otherwise some uart output will be lost
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uart_tx_wait_idle(CONFIG_CONSOLE_UART_NUM);
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rtc_init_lite(XTAL_AUTO);
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// work around a bug that RTC fast memory may be isolated
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// from the system after rtc_init_lite
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SET_PERI_REG_MASK(RTC_CNTL_PWC_REG, RTC_CNTL_FASTMEM_FORCE_NOISO_M);
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cpu_freq_t freq = CPU_80M;
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switch(freq_mhz) {
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case 240:
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freq = CPU_240M;
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break;
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case 160:
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freq = CPU_160M;
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break;
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default:
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freq_mhz = 80;
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/* no break */
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case 80:
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freq = CPU_80M;
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break;
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}
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// freq will be changed to freq in rtc_set_cpu_freq,
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// wait uart tx finish, otherwise some uart output will be lost
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uart_tx_wait_idle(CONFIG_CONSOLE_UART_NUM);
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rtc_set_cpu_freq(freq);
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ets_update_cpu_frequency(freq_mhz);
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}
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void IRAM_ATTR ets_update_cpu_frequency(uint32_t ticks_per_us)
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{
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extern uint32_t g_ticks_per_us_pro; // g_ticks_us defined in ROM for PRO CPU
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extern uint32_t g_ticks_per_us_app; // same defined for APP CPU
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g_ticks_per_us_pro = ticks_per_us;
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g_ticks_per_us_app = ticks_per_us;
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}
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