39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
// Copyright 2015-2018 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.
|
|
|
|
#pragma once
|
|
|
|
#define MHZ (1000000)
|
|
|
|
void rtc_clk_cpu_freq_to_xtal(int freq, int div);
|
|
|
|
/* Values of RTC_XTAL_FREQ_REG and RTC_APB_FREQ_REG are stored as two copies in
|
|
* lower and upper 16-bit halves. These are the routines to work with such a
|
|
* representation.
|
|
*/
|
|
static inline bool clk_val_is_valid(uint32_t val) {
|
|
return (val & 0xffff) == ((val >> 16) & 0xffff) &&
|
|
val != 0 &&
|
|
val != UINT32_MAX;
|
|
}
|
|
|
|
static inline uint32_t reg_val_to_clk_val(uint32_t val) {
|
|
return val & UINT16_MAX;
|
|
}
|
|
|
|
static inline uint32_t clk_val_to_reg_val(uint32_t val) {
|
|
return (val & UINT16_MAX) | ((val & UINT16_MAX) << 16);
|
|
}
|
|
|