1 // Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #pragma once 16 17 #include <stdint.h> 18 #include <stdbool.h> 19 20 #define MHZ (1000000) 21 22 #ifdef __cplusplus 23 extern "C" { 24 #endif 25 26 void rtc_clk_cpu_freq_to_xtal(int freq, int div); 27 28 /* Values of RTC_XTAL_FREQ_REG and RTC_APB_FREQ_REG are stored as two copies in 29 * lower and upper 16-bit halves. These are the routines to work with such a 30 * representation. 31 */ clk_val_is_valid(uint32_t val)32static inline bool clk_val_is_valid(uint32_t val) { 33 return (val & 0xffff) == ((val >> 16) & 0xffff) && 34 val != 0 && 35 val != UINT32_MAX; 36 } 37 reg_val_to_clk_val(uint32_t val)38static inline uint32_t reg_val_to_clk_val(uint32_t val) { 39 return val & UINT16_MAX; 40 } 41 clk_val_to_reg_val(uint32_t val)42static inline uint32_t clk_val_to_reg_val(uint32_t val) { 43 return (val & UINT16_MAX) | ((val & UINT16_MAX) << 16); 44 } 45 46 #ifdef __cplusplus 47 } 48 #endif 49