mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
38 lines
807 B
C
38 lines
807 B
C
/*
|
|
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#include "sdkconfig.h"
|
|
#include "esp_private/systimer.h"
|
|
|
|
/**
|
|
* @brief systimer's clock source is fixed to XTAL (40MHz/26MHz), and has a fixed fractional divider (2.5).
|
|
* So the resolution of the systimer is 40MHz/2.5 = 16MHz, or 26MHz/2.5 = 10.4MHz.
|
|
*/
|
|
|
|
#if CONFIG_XTAL_FREQ_40
|
|
uint64_t systimer_ticks_to_us(uint64_t ticks)
|
|
{
|
|
return ticks / 16;
|
|
}
|
|
|
|
uint64_t systimer_us_to_ticks(uint64_t us)
|
|
{
|
|
return us * 16;
|
|
}
|
|
#elif CONFIG_XTAL_FREQ_26
|
|
uint64_t systimer_ticks_to_us(uint64_t ticks)
|
|
{
|
|
return ticks * 5 / 52;
|
|
}
|
|
|
|
uint64_t systimer_us_to_ticks(uint64_t us)
|
|
{
|
|
return us * 52 / 5;
|
|
}
|
|
#else
|
|
#error "Unsupported XTAL frequency by systimer"
|
|
#endif // CONFIG_XTAL_FREQ_xx
|