lzbp li / mbed-src

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-src by mbed official

targets/hal/TARGET_NORDIC/TARGET_NRF51822/us_ticker.c@104:a6a92e2e5a92, 2014-02-21 (annotated)

Committer:
mbed_official
Date:
Fri Feb 21 12:15:10 2014 +0000
Revision:
104:a6a92e2e5a92
Parent:
85:e1a8e879a6a9
Child:
127:ce7cebc0511f
Synchronized with git revision 195a50befc6da080be0051d0d9bc0838f6cb873e



Full URL: https://github.com/mbedmicro/mbed/commit/195a50befc6da080be0051d0d9bc0838f6cb873e/



nrf-mbed merge

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 85:e1a8e879a6a9 1 /* mbed Microcontroller Library
mbed_official 104:a6a92e2e5a92 2 * Copyright (c) 2013 Nordic Semiconductor
mbed_official 85:e1a8e879a6a9 3 *
mbed_official 85:e1a8e879a6a9 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 85:e1a8e879a6a9 5 * you may not use this file except in compliance with the License.
mbed_official 85:e1a8e879a6a9 6 * You may obtain a copy of the License at
mbed_official 85:e1a8e879a6a9 7 *
mbed_official 85:e1a8e879a6a9 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 85:e1a8e879a6a9 9 *
mbed_official 85:e1a8e879a6a9 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 85:e1a8e879a6a9 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 85:e1a8e879a6a9 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 85:e1a8e879a6a9 13 * See the License for the specific language governing permissions and
mbed_official 85:e1a8e879a6a9 14 * limitations under the License.
mbed_official 85:e1a8e879a6a9 15 */
mbed_official 85:e1a8e879a6a9 16 #include <stddef.h>
mbed_official 85:e1a8e879a6a9 17 #include "us_ticker_api.h"
mbed_official 85:e1a8e879a6a9 18 #include "cmsis.h"
mbed_official 85:e1a8e879a6a9 19 #include "PeripheralNames.h"
mbed_official 85:e1a8e879a6a9 20
mbed_official 85:e1a8e879a6a9 21 #define US_TICKER_TIMER NRF_TIMER1
mbed_official 85:e1a8e879a6a9 22 #define US_TICKER_TIMER_IRQn TIMER1_IRQn
mbed_official 85:e1a8e879a6a9 23
mbed_official 85:e1a8e879a6a9 24 int us_ticker_inited = 0;
mbed_official 85:e1a8e879a6a9 25 volatile uint16_t overflow=0; //overflow value that forms the upper 16 bits of the counter
mbed_official 85:e1a8e879a6a9 26 volatile uint16_t timeStamp=0;
mbed_official 85:e1a8e879a6a9 27
mbed_official 85:e1a8e879a6a9 28 #ifdef __cplusplus
mbed_official 85:e1a8e879a6a9 29 extern "C" {
mbed_official 85:e1a8e879a6a9 30 #endif
mbed_official 85:e1a8e879a6a9 31 void TIMER1_IRQHandler(void){
mbed_official 85:e1a8e879a6a9 32 if ((US_TICKER_TIMER->EVENTS_COMPARE[1] != 0) &&
mbed_official 85:e1a8e879a6a9 33 ((US_TICKER_TIMER->INTENSET & TIMER_INTENSET_COMPARE1_Msk) != 0))
mbed_official 85:e1a8e879a6a9 34 {
mbed_official 85:e1a8e879a6a9 35 US_TICKER_TIMER->EVENTS_COMPARE[1] = 0;
mbed_official 85:e1a8e879a6a9 36 overflow++;
mbed_official 85:e1a8e879a6a9 37 US_TICKER_TIMER->CC[1] =0xFFFF;
mbed_official 85:e1a8e879a6a9 38 if(timeStamp>0)
mbed_official 85:e1a8e879a6a9 39 {
mbed_official 85:e1a8e879a6a9 40 timeStamp--;
mbed_official 85:e1a8e879a6a9 41 if(timeStamp==0)
mbed_official 85:e1a8e879a6a9 42 {
mbed_official 85:e1a8e879a6a9 43 us_ticker_clear_interrupt();
mbed_official 85:e1a8e879a6a9 44 us_ticker_disable_interrupt();
mbed_official 85:e1a8e879a6a9 45 us_ticker_irq_handler();
mbed_official 85:e1a8e879a6a9 46 return;
mbed_official 85:e1a8e879a6a9 47 }
mbed_official 85:e1a8e879a6a9 48 }
mbed_official 85:e1a8e879a6a9 49 }
mbed_official 85:e1a8e879a6a9 50 if ((US_TICKER_TIMER->EVENTS_COMPARE[0] != 0) &&
mbed_official 85:e1a8e879a6a9 51 ((US_TICKER_TIMER->INTENSET & TIMER_INTENSET_COMPARE0_Msk) != 0))
mbed_official 85:e1a8e879a6a9 52 {
mbed_official 85:e1a8e879a6a9 53 us_ticker_clear_interrupt();
mbed_official 85:e1a8e879a6a9 54 us_ticker_disable_interrupt();
mbed_official 85:e1a8e879a6a9 55 if(timeStamp==0)
mbed_official 85:e1a8e879a6a9 56 us_ticker_irq_handler();
mbed_official 85:e1a8e879a6a9 57 }
mbed_official 85:e1a8e879a6a9 58
mbed_official 85:e1a8e879a6a9 59 }
mbed_official 85:e1a8e879a6a9 60 #ifdef __cplusplus
mbed_official 85:e1a8e879a6a9 61 }
mbed_official 85:e1a8e879a6a9 62 #endif
mbed_official 85:e1a8e879a6a9 63 void us_ticker_init(void){
mbed_official 85:e1a8e879a6a9 64 if (us_ticker_inited){
mbed_official 85:e1a8e879a6a9 65 return;
mbed_official 85:e1a8e879a6a9 66 }
mbed_official 85:e1a8e879a6a9 67
mbed_official 85:e1a8e879a6a9 68 us_ticker_inited = 1;
mbed_official 85:e1a8e879a6a9 69
mbed_official 85:e1a8e879a6a9 70 US_TICKER_TIMER->POWER = 0;
mbed_official 85:e1a8e879a6a9 71 US_TICKER_TIMER->POWER = 1;
mbed_official 85:e1a8e879a6a9 72
mbed_official 85:e1a8e879a6a9 73 US_TICKER_TIMER->MODE = TIMER_MODE_MODE_Timer;
mbed_official 85:e1a8e879a6a9 74
mbed_official 85:e1a8e879a6a9 75 US_TICKER_TIMER->PRESCALER = 4;
mbed_official 85:e1a8e879a6a9 76 US_TICKER_TIMER->BITMODE = TIMER_BITMODE_BITMODE_16Bit;
mbed_official 85:e1a8e879a6a9 77 US_TICKER_TIMER->TASKS_CLEAR =1;
mbed_official 85:e1a8e879a6a9 78 US_TICKER_TIMER->CC[1] = 0xFFFF;
mbed_official 85:e1a8e879a6a9 79 US_TICKER_TIMER->INTENSET = TIMER_INTENSET_COMPARE1_Set << TIMER_INTENSET_COMPARE1_Pos;
mbed_official 85:e1a8e879a6a9 80
mbed_official 85:e1a8e879a6a9 81 NVIC_SetPriority(US_TICKER_TIMER_IRQn, 3);
mbed_official 85:e1a8e879a6a9 82 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
mbed_official 85:e1a8e879a6a9 83
mbed_official 85:e1a8e879a6a9 84 US_TICKER_TIMER->TASKS_START = 0x01;
mbed_official 85:e1a8e879a6a9 85 }
mbed_official 85:e1a8e879a6a9 86
mbed_official 85:e1a8e879a6a9 87 uint32_t us_ticker_read(){
mbed_official 85:e1a8e879a6a9 88 if (!us_ticker_inited){
mbed_official 85:e1a8e879a6a9 89 us_ticker_init();
mbed_official 85:e1a8e879a6a9 90 }
mbed_official 85:e1a8e879a6a9 91
mbed_official 85:e1a8e879a6a9 92 uint16_t bufferedOverFlow = overflow;
mbed_official 85:e1a8e879a6a9 93 US_TICKER_TIMER->TASKS_CAPTURE[2] = 1;
mbed_official 85:e1a8e879a6a9 94
mbed_official 85:e1a8e879a6a9 95 if(overflow!=bufferedOverFlow){
mbed_official 85:e1a8e879a6a9 96 bufferedOverFlow = overflow;
mbed_official 85:e1a8e879a6a9 97 US_TICKER_TIMER->TASKS_CAPTURE[2] = 1;
mbed_official 85:e1a8e879a6a9 98 }
mbed_official 85:e1a8e879a6a9 99 return (((uint32_t)bufferedOverFlow<<16) | US_TICKER_TIMER->CC[2]);
mbed_official 85:e1a8e879a6a9 100 }
mbed_official 85:e1a8e879a6a9 101
mbed_official 85:e1a8e879a6a9 102 void us_ticker_set_interrupt(unsigned int timestamp){
mbed_official 85:e1a8e879a6a9 103 if (!us_ticker_inited)
mbed_official 85:e1a8e879a6a9 104 {
mbed_official 85:e1a8e879a6a9 105 us_ticker_init();
mbed_official 85:e1a8e879a6a9 106 }
mbed_official 85:e1a8e879a6a9 107
mbed_official 85:e1a8e879a6a9 108 US_TICKER_TIMER->TASKS_CAPTURE[0] = 1;
mbed_official 85:e1a8e879a6a9 109 uint16_t tsUpper16 = (uint16_t)((timestamp-us_ticker_read())>>16);
mbed_official 85:e1a8e879a6a9 110 if(tsUpper16>0){
mbed_official 85:e1a8e879a6a9 111 if(timeStamp ==0 || timeStamp> tsUpper16){
mbed_official 85:e1a8e879a6a9 112 timeStamp = tsUpper16;
mbed_official 85:e1a8e879a6a9 113 }
mbed_official 85:e1a8e879a6a9 114 }
mbed_official 85:e1a8e879a6a9 115 else{
mbed_official 85:e1a8e879a6a9 116 US_TICKER_TIMER->INTENSET |= TIMER_INTENSET_COMPARE0_Set << TIMER_INTENSET_COMPARE0_Pos;
mbed_official 85:e1a8e879a6a9 117 US_TICKER_TIMER->CC[0] += timestamp-us_ticker_read();
mbed_official 85:e1a8e879a6a9 118 }
mbed_official 85:e1a8e879a6a9 119 }
mbed_official 85:e1a8e879a6a9 120
mbed_official 85:e1a8e879a6a9 121 void us_ticker_disable_interrupt(void){
mbed_official 85:e1a8e879a6a9 122 US_TICKER_TIMER->INTENCLR = TIMER_INTENCLR_COMPARE0_Clear << TIMER_INTENCLR_COMPARE0_Pos;
mbed_official 85:e1a8e879a6a9 123 }
mbed_official 85:e1a8e879a6a9 124 void us_ticker_clear_interrupt(void){
mbed_official 85:e1a8e879a6a9 125 US_TICKER_TIMER->EVENTS_COMPARE[0] = 0;
mbed_official 85:e1a8e879a6a9 126 }