Fawwaz Nadzmy / mbed-STM

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/hal/TARGET_ARM_SSG/TARGET_MPS2/us_ticker.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
80:bdf1132a57cf
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2015 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #include <stddef.h>
bogdanm 0:9b334a45a8ff 17 #include "us_ticker_api.h"
bogdanm 0:9b334a45a8ff 18 #include "PeripheralNames.h"
bogdanm 0:9b334a45a8ff 19
bogdanm 0:9b334a45a8ff 20 #define US_TICKER_TIMER1 CMSDK_DUALTIMER1
bogdanm 0:9b334a45a8ff 21 #define US_TICKER_TIMER2 CMSDK_DUALTIMER2
bogdanm 0:9b334a45a8ff 22 #define US_TICKER_TIMER_IRQn DUALTIMER_IRQn
bogdanm 0:9b334a45a8ff 23
bogdanm 0:9b334a45a8ff 24 int us_ticker_inited = 0;
bogdanm 0:9b334a45a8ff 25
bogdanm 0:9b334a45a8ff 26 void us_ticker_init(void) {
bogdanm 0:9b334a45a8ff 27 if (us_ticker_inited) return;
bogdanm 0:9b334a45a8ff 28 us_ticker_inited = 1;
bogdanm 0:9b334a45a8ff 29
bogdanm 0:9b334a45a8ff 30 US_TICKER_TIMER1->TimerControl = 0x0; // disable timer
bogdanm 0:9b334a45a8ff 31 US_TICKER_TIMER2->TimerControl = 0x00; // disable timer
bogdanm 0:9b334a45a8ff 32 US_TICKER_TIMER1->TimerLoad = 0xFFFFFFFF;
bogdanm 0:9b334a45a8ff 33 US_TICKER_TIMER2->TimerLoad = 0xFFFFFFFF;
bogdanm 0:9b334a45a8ff 34
bogdanm 0:9b334a45a8ff 35 US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode
bogdanm 0:9b334a45a8ff 36 US_TICKER_TIMER2->TimerControl = 0x42; // enable interrupt and set to 32 bit counter
bogdanm 0:9b334a45a8ff 37
bogdanm 0:9b334a45a8ff 38 US_TICKER_TIMER1->TimerControl |= 0x80; // enable counter
bogdanm 0:9b334a45a8ff 39 US_TICKER_TIMER2->TimerControl |= 0x80; // enable counter
bogdanm 0:9b334a45a8ff 40
bogdanm 0:9b334a45a8ff 41 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
bogdanm 0:9b334a45a8ff 42 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
bogdanm 0:9b334a45a8ff 43 }
bogdanm 0:9b334a45a8ff 44
bogdanm 0:9b334a45a8ff 45 uint32_t us_ticker_read() {
bogdanm 0:9b334a45a8ff 46 uint32_t return_value = 0;
bogdanm 0:9b334a45a8ff 47 if (!us_ticker_inited)
bogdanm 0:9b334a45a8ff 48 us_ticker_init();
bogdanm 0:9b334a45a8ff 49 return_value = ((~US_TICKER_TIMER2->TimerValue)/25);
bogdanm 0:9b334a45a8ff 50 return return_value;
bogdanm 0:9b334a45a8ff 51 }
bogdanm 0:9b334a45a8ff 52
bogdanm 0:9b334a45a8ff 53 void us_ticker_set_interrupt(timestamp_t timestamp) {
bogdanm 0:9b334a45a8ff 54 uint32_t timer_value = 0;
bogdanm 0:9b334a45a8ff 55 int delta = 0;
bogdanm 0:9b334a45a8ff 56 if (!us_ticker_inited)
bogdanm 0:9b334a45a8ff 57 us_ticker_init();
bogdanm 0:9b334a45a8ff 58 delta = (int)(timestamp - us_ticker_read());
bogdanm 0:9b334a45a8ff 59 if (delta <= 0) {
bogdanm 0:9b334a45a8ff 60 // This event was in the past:
bogdanm 0:9b334a45a8ff 61 us_ticker_irq_handler();
bogdanm 0:9b334a45a8ff 62 return;
bogdanm 0:9b334a45a8ff 63 }
bogdanm 0:9b334a45a8ff 64 timer_value = (delta)*25;
bogdanm 0:9b334a45a8ff 65 // enable interrupt
bogdanm 0:9b334a45a8ff 66 US_TICKER_TIMER1->TimerControl = 0x0; // disable timer
bogdanm 0:9b334a45a8ff 67 US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode
bogdanm 0:9b334a45a8ff 68 US_TICKER_TIMER1->TimerLoad = (delta)*25; //initialise the timer value
bogdanm 0:9b334a45a8ff 69 US_TICKER_TIMER1->TimerControl |= 0x80; //enable timer
bogdanm 0:9b334a45a8ff 70 }
bogdanm 0:9b334a45a8ff 71
bogdanm 0:9b334a45a8ff 72 void us_ticker_disable_interrupt(void) {
bogdanm 0:9b334a45a8ff 73
bogdanm 0:9b334a45a8ff 74 US_TICKER_TIMER1->TimerControl &= 0xDF;
bogdanm 0:9b334a45a8ff 75 US_TICKER_TIMER2->TimerControl &= 0xDF;
bogdanm 0:9b334a45a8ff 76
bogdanm 0:9b334a45a8ff 77 }
bogdanm 0:9b334a45a8ff 78
bogdanm 0:9b334a45a8ff 79 void us_ticker_clear_interrupt(void) {
bogdanm 0:9b334a45a8ff 80
bogdanm 0:9b334a45a8ff 81 US_TICKER_TIMER1->TimerIntClr = 0x1;
bogdanm 0:9b334a45a8ff 82 US_TICKER_TIMER2->TimerIntClr = 0x1;
bogdanm 0:9b334a45a8ff 83
bogdanm 0:9b334a45a8ff 84 }