mbed library sources. Supersedes mbed-src.
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targets/hal/TARGET_ARM_SSG/TARGET_MPS2/us_ticker.c
- Committer:
- mbed_official
- Date:
- 2016-03-02
- Revision:
- 80:bdf1132a57cf
- Parent:
- 0:9b334a45a8ff
- Child:
- 144:ef7eb2e8f9f7
File content as of revision 80:bdf1132a57cf:
/* mbed Microcontroller Library * Copyright (c) 2006-2015 ARM Limited * * 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. */ #include <stddef.h> #include "us_ticker_api.h" #include "PeripheralNames.h" #define US_TICKER_TIMER1 CMSDK_DUALTIMER1 #define US_TICKER_TIMER2 CMSDK_DUALTIMER2 #define US_TICKER_TIMER_IRQn DUALTIMER_IRQn int us_ticker_inited = 0; void us_ticker_init(void) { if (us_ticker_inited) return; us_ticker_inited = 1; US_TICKER_TIMER1->TimerControl = 0x0; // disable timer US_TICKER_TIMER2->TimerControl = 0x00; // disable timer US_TICKER_TIMER1->TimerLoad = 0xFFFFFFFF; US_TICKER_TIMER2->TimerLoad = 0xFFFFFFFF; US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode US_TICKER_TIMER2->TimerControl = 0x42; // enable interrupt and set to 32 bit counter US_TICKER_TIMER1->TimerControl |= 0x80; // enable counter US_TICKER_TIMER2->TimerControl |= 0x80; // enable counter NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler); NVIC_EnableIRQ(US_TICKER_TIMER_IRQn); } uint32_t us_ticker_read() { uint32_t return_value = 0; if (!us_ticker_inited) us_ticker_init(); return_value = ((~US_TICKER_TIMER2->TimerValue)/25); return return_value; } void us_ticker_set_interrupt(timestamp_t timestamp) { int delta = 0; if (!us_ticker_inited) us_ticker_init(); delta = (int)(timestamp - us_ticker_read()); if (delta <= 0) { // This event was in the past: us_ticker_irq_handler(); return; } // enable interrupt US_TICKER_TIMER1->TimerControl = 0x0; // disable timer US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode US_TICKER_TIMER1->TimerLoad = (delta)*25; //initialise the timer value US_TICKER_TIMER1->TimerControl |= 0x80; //enable timer } void us_ticker_disable_interrupt(void) { US_TICKER_TIMER1->TimerControl &= 0xDF; US_TICKER_TIMER2->TimerControl &= 0xDF; } void us_ticker_clear_interrupt(void) { US_TICKER_TIMER1->TimerIntClr = 0x1; US_TICKER_TIMER2->TimerIntClr = 0x1; }