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Fork of mbed-src by mbed official

targets/hal/TARGET_NORDIC/TARGET_NRF51822/us_ticker.c@85:e1a8e879a6a9, 2014-02-07 (annotated)

Committer:
mbed_official
Date:
Fri Feb 07 18:00:11 2014 +0000
Revision:
85:e1a8e879a6a9
Child:
104:a6a92e2e5a92
Synchronized with git revision 4b2b368a6a3b1f0fd33d99917981c67436c4aebe



Full URL: https://github.com/mbedmicro/mbed/commit/4b2b368a6a3b1f0fd33d99917981c67436c4aebe/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 85:e1a8e879a6a9 1 /* mbed Microcontroller Library
mbed_official 85:e1a8e879a6a9 2 * Copyright (c) 2006-2013 ARM Limited
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 }