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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_ARM_SSG/TARGET_MPS2/us_ticker.c@580:3c14cb9b87c5, 2015-07-02 (annotated)

Committer:
mbed_official
Date:
Thu Jul 02 16:15:09 2015 +0100
Revision:
580:3c14cb9b87c5
Synchronized with git revision 213caf296f26963a7bea129b8ec4f33bbd1e6588



Full URL: https://github.com/mbedmicro/mbed/commit/213caf296f26963a7bea129b8ec4f33bbd1e6588/



commit of mps2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 580:3c14cb9b87c5 1 /* mbed Microcontroller Library
mbed_official 580:3c14cb9b87c5 2 * Copyright (c) 2006-2015 ARM Limited
mbed_official 580:3c14cb9b87c5 3 *
mbed_official 580:3c14cb9b87c5 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 580:3c14cb9b87c5 5 * you may not use this file except in compliance with the License.
mbed_official 580:3c14cb9b87c5 6 * You may obtain a copy of the License at
mbed_official 580:3c14cb9b87c5 7 *
mbed_official 580:3c14cb9b87c5 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 580:3c14cb9b87c5 9 *
mbed_official 580:3c14cb9b87c5 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 580:3c14cb9b87c5 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 580:3c14cb9b87c5 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 580:3c14cb9b87c5 13 * See the License for the specific language governing permissions and
mbed_official 580:3c14cb9b87c5 14 * limitations under the License.
mbed_official 580:3c14cb9b87c5 15 */
mbed_official 580:3c14cb9b87c5 16 #include <stddef.h>
mbed_official 580:3c14cb9b87c5 17 #include "us_ticker_api.h"
mbed_official 580:3c14cb9b87c5 18 #include "PeripheralNames.h"
mbed_official 580:3c14cb9b87c5 19
mbed_official 580:3c14cb9b87c5 20 #define US_TICKER_TIMER1 CMSDK_DUALTIMER1
mbed_official 580:3c14cb9b87c5 21 #define US_TICKER_TIMER2 CMSDK_DUALTIMER2
mbed_official 580:3c14cb9b87c5 22 #define US_TICKER_TIMER_IRQn DUALTIMER_IRQn
mbed_official 580:3c14cb9b87c5 23
mbed_official 580:3c14cb9b87c5 24 int us_ticker_inited = 0;
mbed_official 580:3c14cb9b87c5 25
mbed_official 580:3c14cb9b87c5 26 void us_ticker_init(void) {
mbed_official 580:3c14cb9b87c5 27 if (us_ticker_inited) return;
mbed_official 580:3c14cb9b87c5 28 us_ticker_inited = 1;
mbed_official 580:3c14cb9b87c5 29
mbed_official 580:3c14cb9b87c5 30 US_TICKER_TIMER1->TimerControl = 0x0; // disable timer
mbed_official 580:3c14cb9b87c5 31 US_TICKER_TIMER2->TimerControl = 0x00; // disable timer
mbed_official 580:3c14cb9b87c5 32 US_TICKER_TIMER1->TimerLoad = 0xFFFFFFFF;
mbed_official 580:3c14cb9b87c5 33 US_TICKER_TIMER2->TimerLoad = 0xFFFFFFFF;
mbed_official 580:3c14cb9b87c5 34
mbed_official 580:3c14cb9b87c5 35 US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode
mbed_official 580:3c14cb9b87c5 36 US_TICKER_TIMER2->TimerControl = 0x42; // enable interrupt and set to 32 bit counter
mbed_official 580:3c14cb9b87c5 37
mbed_official 580:3c14cb9b87c5 38 US_TICKER_TIMER1->TimerControl |= 0x80; // enable counter
mbed_official 580:3c14cb9b87c5 39 US_TICKER_TIMER2->TimerControl |= 0x80; // enable counter
mbed_official 580:3c14cb9b87c5 40
mbed_official 580:3c14cb9b87c5 41 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
mbed_official 580:3c14cb9b87c5 42 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
mbed_official 580:3c14cb9b87c5 43 }
mbed_official 580:3c14cb9b87c5 44
mbed_official 580:3c14cb9b87c5 45 uint32_t us_ticker_read() {
mbed_official 580:3c14cb9b87c5 46 uint32_t return_value = 0;
mbed_official 580:3c14cb9b87c5 47 if (!us_ticker_inited)
mbed_official 580:3c14cb9b87c5 48 us_ticker_init();
mbed_official 580:3c14cb9b87c5 49 return_value = ((~US_TICKER_TIMER2->TimerValue)/25);
mbed_official 580:3c14cb9b87c5 50 return return_value;
mbed_official 580:3c14cb9b87c5 51 }
mbed_official 580:3c14cb9b87c5 52
mbed_official 580:3c14cb9b87c5 53 void us_ticker_set_interrupt(timestamp_t timestamp) {
mbed_official 580:3c14cb9b87c5 54 uint32_t timer_value = 0;
mbed_official 580:3c14cb9b87c5 55 int delta = 0;
mbed_official 580:3c14cb9b87c5 56 if (!us_ticker_inited)
mbed_official 580:3c14cb9b87c5 57 us_ticker_init();
mbed_official 580:3c14cb9b87c5 58 delta = (int)(timestamp - us_ticker_read());
mbed_official 580:3c14cb9b87c5 59 if (delta <= 0) {
mbed_official 580:3c14cb9b87c5 60 // This event was in the past:
mbed_official 580:3c14cb9b87c5 61 us_ticker_irq_handler();
mbed_official 580:3c14cb9b87c5 62 return;
mbed_official 580:3c14cb9b87c5 63 }
mbed_official 580:3c14cb9b87c5 64 timer_value = (delta)*25;
mbed_official 580:3c14cb9b87c5 65 // enable interrupt
mbed_official 580:3c14cb9b87c5 66 US_TICKER_TIMER1->TimerControl = 0x0; // disable timer
mbed_official 580:3c14cb9b87c5 67 US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode
mbed_official 580:3c14cb9b87c5 68 US_TICKER_TIMER1->TimerLoad = (delta)*25; //initialise the timer value
mbed_official 580:3c14cb9b87c5 69 US_TICKER_TIMER1->TimerControl |= 0x80; //enable timer
mbed_official 580:3c14cb9b87c5 70 }
mbed_official 580:3c14cb9b87c5 71
mbed_official 580:3c14cb9b87c5 72 void us_ticker_disable_interrupt(void) {
mbed_official 580:3c14cb9b87c5 73
mbed_official 580:3c14cb9b87c5 74 US_TICKER_TIMER1->TimerControl &= 0xDF;
mbed_official 580:3c14cb9b87c5 75 US_TICKER_TIMER2->TimerControl &= 0xDF;
mbed_official 580:3c14cb9b87c5 76
mbed_official 580:3c14cb9b87c5 77 }
mbed_official 580:3c14cb9b87c5 78
mbed_official 580:3c14cb9b87c5 79 void us_ticker_clear_interrupt(void) {
mbed_official 580:3c14cb9b87c5 80
mbed_official 580:3c14cb9b87c5 81 US_TICKER_TIMER1->TimerIntClr = 0x1;
mbed_official 580:3c14cb9b87c5 82 US_TICKER_TIMER2->TimerIntClr = 0x1;
mbed_official 580:3c14cb9b87c5 83
mbed_official 580:3c14cb9b87c5 84 }