65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/*******************************************************************************
|
|
// Copyright (c) 2003-2015 Cadence Design Systems, Inc.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining
|
|
// a copy of this software and associated documentation files (the
|
|
// "Software"), to deal in the Software without restriction, including
|
|
// without limitation the rights to use, copy, modify, merge, publish,
|
|
// distribute, sublicense, and/or sell copies of the Software, and to
|
|
// permit persons to whom the Software is furnished to do so, subject to
|
|
// the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included
|
|
// in all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
--------------------------------------------------------------------------------
|
|
|
|
XTENSA INITIALIZATION ROUTINES CODED IN C
|
|
|
|
This file contains miscellaneous Xtensa RTOS-generic initialization functions
|
|
that are implemented in C.
|
|
|
|
*******************************************************************************/
|
|
|
|
|
|
#ifdef XT_BOARD
|
|
#include <xtensa/xtbsp.h>
|
|
#endif
|
|
|
|
#include "xtensa_rtos.h"
|
|
|
|
#ifdef XT_RTOS_TIMER_INT
|
|
|
|
unsigned _xt_tick_divisor = 0; /* cached number of cycles per tick */
|
|
|
|
/*
|
|
Compute and initialize at run-time the tick divisor (the number of
|
|
processor clock cycles in an RTOS tick, used to set the tick timer).
|
|
Called when the processor clock frequency is not known at compile-time.
|
|
*/
|
|
void _xt_tick_divisor_init(void)
|
|
{
|
|
#ifdef XT_CLOCK_FREQ
|
|
|
|
_xt_tick_divisor = (XT_CLOCK_FREQ / XT_TICK_PER_SEC);
|
|
|
|
#else
|
|
|
|
#ifdef XT_BOARD
|
|
_xt_tick_divisor = xtbsp_clock_freq_hz() / XT_TICK_PER_SEC;
|
|
#else
|
|
#error "No way to obtain processor clock frequency"
|
|
#endif /* XT_BOARD */
|
|
|
|
#endif /* XT_CLOCK_FREQ */
|
|
}
|
|
|
|
#endif /* XT_RTOS_TIMER_INT */
|
|
|