0ef1717155
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90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2015 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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 "PeripheralNames.h"
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#define US_TICKER_TIMER1 CMSDK_DUALTIMER1
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#define US_TICKER_TIMER2 CMSDK_DUALTIMER2
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#define US_TICKER_TIMER_IRQn DUALTIMER_IRQn
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int us_ticker_inited = 0;
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void us_ticker_init(void) {
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if (us_ticker_inited) return;
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us_ticker_inited = 1;
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US_TICKER_TIMER1->TimerControl = 0x0; // disable timer
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US_TICKER_TIMER2->TimerControl = 0x00; // disable timer
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US_TICKER_TIMER1->TimerLoad = 0xFFFFFFFF;
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US_TICKER_TIMER2->TimerLoad = 0xFFFFFFFF;
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US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode
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US_TICKER_TIMER2->TimerControl = 0x42; // enable interrupt and set to 32 bit counter
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US_TICKER_TIMER1->TimerControl |= 0x80; // enable counter
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US_TICKER_TIMER2->TimerControl |= 0x80; // enable counter
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NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
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NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
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}
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uint32_t us_ticker_read() {
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uint32_t return_value = 0;
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if (!us_ticker_inited)
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us_ticker_init();
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return_value = ((~US_TICKER_TIMER2->TimerValue)/25);
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return return_value;
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}
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void us_ticker_set_interrupt(timestamp_t timestamp) {
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if (!us_ticker_inited)
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us_ticker_init();
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uint32_t delta = timestamp - us_ticker_read();
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// enable interrupt
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US_TICKER_TIMER1->TimerControl = 0x0; // disable timer
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US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode
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US_TICKER_TIMER1->TimerLoad = (delta)*25; //initialise the timer value
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US_TICKER_TIMER1->TimerControl |= 0x80; //enable timer
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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_TICKER_TIMER_IRQn);
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}
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void us_ticker_disable_interrupt(void) {
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US_TICKER_TIMER1->TimerControl &= 0xDF;
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US_TICKER_TIMER2->TimerControl &= 0xDF;
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}
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void us_ticker_clear_interrupt(void) {
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US_TICKER_TIMER1->TimerIntClr = 0x1;
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US_TICKER_TIMER2->TimerIntClr = 0x1;
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}
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void us_ticker_free(void)
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{
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}
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