mirror of https://github.com/ARMmbed/mbed-os.git
113 lines
4.0 KiB
C
113 lines
4.0 KiB
C
/*******************************************************************************
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* Copyright (c) 2016,2018 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*******************************************************************************
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*/
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#include <stddef.h>
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#include "us_ticker_api.h"
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#include "tmr.h"
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#define US_TIMER MXC_TMR0
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#define US_TIMER_IRQn TMR0_0_IRQn
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#define US_TIMER_PRESCALE TMR_PRESCALE_DIV_2_5
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#define US_TIMER_MODE TMR32_MODE_COMPARE
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#define US_TIMER_WIDTH 32
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//******************************************************************************
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void us_ticker_init(void)
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{
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// Disable and deconfigure
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US_TIMER->ctrl = 0;
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US_TIMER->term_cnt32 = 0;
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US_TIMER->inten = 0;
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US_TIMER->intfl = MXC_F_TMR_INTFL_TIMER0;
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// Configure and enable
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US_TIMER->ctrl = MXC_F_TMR_CTRL_ENABLE0 |
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(US_TIMER_MODE << MXC_F_TMR_CTRL_MODE_POS) |
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(US_TIMER_PRESCALE << MXC_F_TMR_CTRL_PRESCALE_POS);
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NVIC_SetVector(US_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
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NVIC_EnableIRQ(US_TIMER_IRQn);
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}
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//******************************************************************************
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void us_ticker_free(void)
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{
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US_TIMER->ctrl = 0;
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}
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//******************************************************************************
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uint32_t us_ticker_read(void)
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{
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return US_TIMER->count32;
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}
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//******************************************************************************
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void us_ticker_set_interrupt(timestamp_t timestamp)
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{
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US_TIMER->ctrl = 0;
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US_TIMER->term_cnt32 = (timestamp) ? timestamp : 1;
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US_TIMER->inten = MXC_F_TMR_INTEN_TIMER0;
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US_TIMER->ctrl = MXC_F_TMR_CTRL_ENABLE0 |
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(US_TIMER_MODE << MXC_F_TMR_CTRL_MODE_POS) |
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(US_TIMER_PRESCALE << MXC_F_TMR_CTRL_PRESCALE_POS);
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}
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//******************************************************************************
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void us_ticker_fire_interrupt(void)
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{
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NVIC_SetPendingIRQ(US_TIMER_IRQn);
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}
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//******************************************************************************
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void us_ticker_disable_interrupt(void)
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{
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US_TIMER->inten = 0;
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}
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//******************************************************************************
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void us_ticker_clear_interrupt(void)
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{
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US_TIMER->intfl = MXC_F_TMR_INTFL_TIMER0;
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}
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//******************************************************************************
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const ticker_info_t* us_ticker_get_info(void)
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{
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static const ticker_info_t info = {
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RO_FREQ >> US_TIMER_PRESCALE,
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US_TIMER_WIDTH
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};
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return &info;
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}
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