Mouse code for the MacroRat
mbed-dev/targets/TARGET_Silicon_Labs/TARGET_EFM32/lp_ticker.c@18:6a4db94011d3, 2017-05-14 (annotated)
- Committer:
- sahilmgandhi
- Date:
- Sun May 14 23:18:57 2017 +0000
- Revision:
- 18:6a4db94011d3
Publishing again
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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sahilmgandhi | 18:6a4db94011d3 | 1 | /***************************************************************************//** |
sahilmgandhi | 18:6a4db94011d3 | 2 | * @file lp_ticker.c |
sahilmgandhi | 18:6a4db94011d3 | 3 | ******************************************************************************* |
sahilmgandhi | 18:6a4db94011d3 | 4 | * @section License |
sahilmgandhi | 18:6a4db94011d3 | 5 | * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> |
sahilmgandhi | 18:6a4db94011d3 | 6 | ******************************************************************************* |
sahilmgandhi | 18:6a4db94011d3 | 7 | * |
sahilmgandhi | 18:6a4db94011d3 | 8 | * SPDX-License-Identifier: Apache-2.0 |
sahilmgandhi | 18:6a4db94011d3 | 9 | * |
sahilmgandhi | 18:6a4db94011d3 | 10 | * Licensed under the Apache License, Version 2.0 (the "License"); you may |
sahilmgandhi | 18:6a4db94011d3 | 11 | * not use this file except in compliance with the License. |
sahilmgandhi | 18:6a4db94011d3 | 12 | * You may obtain a copy of the License at |
sahilmgandhi | 18:6a4db94011d3 | 13 | * |
sahilmgandhi | 18:6a4db94011d3 | 14 | * http://www.apache.org/licenses/LICENSE-2.0 |
sahilmgandhi | 18:6a4db94011d3 | 15 | * |
sahilmgandhi | 18:6a4db94011d3 | 16 | * Unless required by applicable law or agreed to in writing, software |
sahilmgandhi | 18:6a4db94011d3 | 17 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
sahilmgandhi | 18:6a4db94011d3 | 18 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
sahilmgandhi | 18:6a4db94011d3 | 19 | * See the License for the specific language governing permissions and |
sahilmgandhi | 18:6a4db94011d3 | 20 | * limitations under the License. |
sahilmgandhi | 18:6a4db94011d3 | 21 | * |
sahilmgandhi | 18:6a4db94011d3 | 22 | ******************************************************************************/ |
sahilmgandhi | 18:6a4db94011d3 | 23 | |
sahilmgandhi | 18:6a4db94011d3 | 24 | #include "device.h" |
sahilmgandhi | 18:6a4db94011d3 | 25 | #include "clocking.h" |
sahilmgandhi | 18:6a4db94011d3 | 26 | #if DEVICE_LOWPOWERTIMER |
sahilmgandhi | 18:6a4db94011d3 | 27 | |
sahilmgandhi | 18:6a4db94011d3 | 28 | #include "rtc_api.h" |
sahilmgandhi | 18:6a4db94011d3 | 29 | #include "rtc_api_HAL.h" |
sahilmgandhi | 18:6a4db94011d3 | 30 | #include "lp_ticker_api.h" |
sahilmgandhi | 18:6a4db94011d3 | 31 | |
sahilmgandhi | 18:6a4db94011d3 | 32 | #include "mbed_critical.h" |
sahilmgandhi | 18:6a4db94011d3 | 33 | #if (defined RTCC_COUNT) && (RTCC_COUNT > 0) |
sahilmgandhi | 18:6a4db94011d3 | 34 | #include "em_rtcc.h" |
sahilmgandhi | 18:6a4db94011d3 | 35 | #endif |
sahilmgandhi | 18:6a4db94011d3 | 36 | |
sahilmgandhi | 18:6a4db94011d3 | 37 | static int rtc_reserved = 0; |
sahilmgandhi | 18:6a4db94011d3 | 38 | |
sahilmgandhi | 18:6a4db94011d3 | 39 | void lp_ticker_init() |
sahilmgandhi | 18:6a4db94011d3 | 40 | { |
sahilmgandhi | 18:6a4db94011d3 | 41 | if(!rtc_reserved) { |
sahilmgandhi | 18:6a4db94011d3 | 42 | core_util_critical_section_enter(); |
sahilmgandhi | 18:6a4db94011d3 | 43 | rtc_init_real(RTC_INIT_LPTIMER); |
sahilmgandhi | 18:6a4db94011d3 | 44 | rtc_set_comp0_handler((uint32_t)lp_ticker_irq_handler); |
sahilmgandhi | 18:6a4db94011d3 | 45 | rtc_reserved = 1; |
sahilmgandhi | 18:6a4db94011d3 | 46 | core_util_critical_section_exit(); |
sahilmgandhi | 18:6a4db94011d3 | 47 | } |
sahilmgandhi | 18:6a4db94011d3 | 48 | } |
sahilmgandhi | 18:6a4db94011d3 | 49 | |
sahilmgandhi | 18:6a4db94011d3 | 50 | void lp_ticker_free() |
sahilmgandhi | 18:6a4db94011d3 | 51 | { |
sahilmgandhi | 18:6a4db94011d3 | 52 | if(rtc_reserved) { |
sahilmgandhi | 18:6a4db94011d3 | 53 | core_util_critical_section_enter(); |
sahilmgandhi | 18:6a4db94011d3 | 54 | rtc_free_real(RTC_INIT_LPTIMER); |
sahilmgandhi | 18:6a4db94011d3 | 55 | rtc_reserved = 0; |
sahilmgandhi | 18:6a4db94011d3 | 56 | core_util_critical_section_exit(); |
sahilmgandhi | 18:6a4db94011d3 | 57 | } |
sahilmgandhi | 18:6a4db94011d3 | 58 | } |
sahilmgandhi | 18:6a4db94011d3 | 59 | |
sahilmgandhi | 18:6a4db94011d3 | 60 | #ifndef RTCC_COUNT |
sahilmgandhi | 18:6a4db94011d3 | 61 | |
sahilmgandhi | 18:6a4db94011d3 | 62 | /* RTC API */ |
sahilmgandhi | 18:6a4db94011d3 | 63 | |
sahilmgandhi | 18:6a4db94011d3 | 64 | void lp_ticker_set_interrupt(timestamp_t timestamp) |
sahilmgandhi | 18:6a4db94011d3 | 65 | { |
sahilmgandhi | 18:6a4db94011d3 | 66 | uint64_t timestamp_ticks; |
sahilmgandhi | 18:6a4db94011d3 | 67 | uint64_t current_ticks = RTC_CounterGet(); |
sahilmgandhi | 18:6a4db94011d3 | 68 | timestamp_t current_time = ((uint64_t)(current_ticks * 1000000) / (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT)); |
sahilmgandhi | 18:6a4db94011d3 | 69 | |
sahilmgandhi | 18:6a4db94011d3 | 70 | /* Initialize RTC */ |
sahilmgandhi | 18:6a4db94011d3 | 71 | lp_ticker_init(); |
sahilmgandhi | 18:6a4db94011d3 | 72 | |
sahilmgandhi | 18:6a4db94011d3 | 73 | /* calculate offset value */ |
sahilmgandhi | 18:6a4db94011d3 | 74 | timestamp_t offset = timestamp - current_time; |
sahilmgandhi | 18:6a4db94011d3 | 75 | if(offset > 0xEFFFFFFF) offset = 100; |
sahilmgandhi | 18:6a4db94011d3 | 76 | |
sahilmgandhi | 18:6a4db94011d3 | 77 | /* map offset to RTC value */ |
sahilmgandhi | 18:6a4db94011d3 | 78 | // ticks = offset * RTC frequency div 1000000 |
sahilmgandhi | 18:6a4db94011d3 | 79 | timestamp_ticks = ((uint64_t)offset * (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT)) / 1000000; |
sahilmgandhi | 18:6a4db94011d3 | 80 | timestamp_ticks += current_ticks; |
sahilmgandhi | 18:6a4db94011d3 | 81 | |
sahilmgandhi | 18:6a4db94011d3 | 82 | /* RTC has 24 bit resolution */ |
sahilmgandhi | 18:6a4db94011d3 | 83 | timestamp_ticks &= 0xFFFFFF; |
sahilmgandhi | 18:6a4db94011d3 | 84 | |
sahilmgandhi | 18:6a4db94011d3 | 85 | /* check for RTC limitation */ |
sahilmgandhi | 18:6a4db94011d3 | 86 | if((timestamp_ticks - RTC_CounterGet()) >= 0x800000) timestamp_ticks = RTC_CounterGet() + 2; |
sahilmgandhi | 18:6a4db94011d3 | 87 | |
sahilmgandhi | 18:6a4db94011d3 | 88 | /* Set callback */ |
sahilmgandhi | 18:6a4db94011d3 | 89 | RTC_FreezeEnable(true); |
sahilmgandhi | 18:6a4db94011d3 | 90 | RTC_CompareSet(0, (uint32_t)timestamp_ticks); |
sahilmgandhi | 18:6a4db94011d3 | 91 | RTC_IntEnable(RTC_IF_COMP0); |
sahilmgandhi | 18:6a4db94011d3 | 92 | RTC_FreezeEnable(false); |
sahilmgandhi | 18:6a4db94011d3 | 93 | } |
sahilmgandhi | 18:6a4db94011d3 | 94 | |
sahilmgandhi | 18:6a4db94011d3 | 95 | inline void lp_ticker_disable_interrupt() |
sahilmgandhi | 18:6a4db94011d3 | 96 | { |
sahilmgandhi | 18:6a4db94011d3 | 97 | RTC_IntDisable(RTC_IF_COMP0); |
sahilmgandhi | 18:6a4db94011d3 | 98 | lp_ticker_free(); |
sahilmgandhi | 18:6a4db94011d3 | 99 | } |
sahilmgandhi | 18:6a4db94011d3 | 100 | |
sahilmgandhi | 18:6a4db94011d3 | 101 | inline void lp_ticker_clear_interrupt() |
sahilmgandhi | 18:6a4db94011d3 | 102 | { |
sahilmgandhi | 18:6a4db94011d3 | 103 | RTC_IntClear(RTC_IF_COMP0); |
sahilmgandhi | 18:6a4db94011d3 | 104 | } |
sahilmgandhi | 18:6a4db94011d3 | 105 | |
sahilmgandhi | 18:6a4db94011d3 | 106 | timestamp_t lp_ticker_read() |
sahilmgandhi | 18:6a4db94011d3 | 107 | { |
sahilmgandhi | 18:6a4db94011d3 | 108 | lp_ticker_init(); |
sahilmgandhi | 18:6a4db94011d3 | 109 | |
sahilmgandhi | 18:6a4db94011d3 | 110 | uint64_t ticks_temp; |
sahilmgandhi | 18:6a4db94011d3 | 111 | uint64_t ticks = RTC_CounterGet(); |
sahilmgandhi | 18:6a4db94011d3 | 112 | |
sahilmgandhi | 18:6a4db94011d3 | 113 | /* ticks = counter tick value |
sahilmgandhi | 18:6a4db94011d3 | 114 | * timestamp = value in microseconds |
sahilmgandhi | 18:6a4db94011d3 | 115 | * timestamp = ticks * 1.000.000 / RTC frequency |
sahilmgandhi | 18:6a4db94011d3 | 116 | */ |
sahilmgandhi | 18:6a4db94011d3 | 117 | |
sahilmgandhi | 18:6a4db94011d3 | 118 | ticks_temp = (ticks * 1000000) / (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT); |
sahilmgandhi | 18:6a4db94011d3 | 119 | return (timestamp_t) (ticks_temp & 0xFFFFFFFF); |
sahilmgandhi | 18:6a4db94011d3 | 120 | } |
sahilmgandhi | 18:6a4db94011d3 | 121 | |
sahilmgandhi | 18:6a4db94011d3 | 122 | #else |
sahilmgandhi | 18:6a4db94011d3 | 123 | |
sahilmgandhi | 18:6a4db94011d3 | 124 | /* RTCC API */ |
sahilmgandhi | 18:6a4db94011d3 | 125 | |
sahilmgandhi | 18:6a4db94011d3 | 126 | void lp_ticker_set_interrupt(timestamp_t timestamp) |
sahilmgandhi | 18:6a4db94011d3 | 127 | { |
sahilmgandhi | 18:6a4db94011d3 | 128 | uint64_t timestamp_ticks; |
sahilmgandhi | 18:6a4db94011d3 | 129 | uint64_t current_ticks = RTCC_CounterGet(); |
sahilmgandhi | 18:6a4db94011d3 | 130 | timestamp_t current_time = ((uint64_t)(current_ticks * 1000000) / (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT)); |
sahilmgandhi | 18:6a4db94011d3 | 131 | |
sahilmgandhi | 18:6a4db94011d3 | 132 | /* Initialize RTC */ |
sahilmgandhi | 18:6a4db94011d3 | 133 | lp_ticker_init(); |
sahilmgandhi | 18:6a4db94011d3 | 134 | |
sahilmgandhi | 18:6a4db94011d3 | 135 | /* calculate offset value */ |
sahilmgandhi | 18:6a4db94011d3 | 136 | timestamp_t offset = timestamp - current_time; |
sahilmgandhi | 18:6a4db94011d3 | 137 | if(offset > 0xEFFFFFFF) offset = 100; |
sahilmgandhi | 18:6a4db94011d3 | 138 | |
sahilmgandhi | 18:6a4db94011d3 | 139 | /* map offset to RTC value */ |
sahilmgandhi | 18:6a4db94011d3 | 140 | // ticks = offset * RTC frequency div 1000000 |
sahilmgandhi | 18:6a4db94011d3 | 141 | timestamp_ticks = ((uint64_t)offset * (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT)) / 1000000; |
sahilmgandhi | 18:6a4db94011d3 | 142 | // checking the rounding. If timeout is wanted between RTCC ticks, irq should be configured to |
sahilmgandhi | 18:6a4db94011d3 | 143 | // trigger in the latter RTCC-tick. Otherwise ticker-api fails to send timer event to its client |
sahilmgandhi | 18:6a4db94011d3 | 144 | if(((timestamp_ticks * 1000000) / (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT)) < offset){ |
sahilmgandhi | 18:6a4db94011d3 | 145 | timestamp_ticks++; |
sahilmgandhi | 18:6a4db94011d3 | 146 | } |
sahilmgandhi | 18:6a4db94011d3 | 147 | |
sahilmgandhi | 18:6a4db94011d3 | 148 | timestamp_ticks += current_ticks; |
sahilmgandhi | 18:6a4db94011d3 | 149 | |
sahilmgandhi | 18:6a4db94011d3 | 150 | /* RTCC has 32 bit resolution */ |
sahilmgandhi | 18:6a4db94011d3 | 151 | timestamp_ticks &= 0xFFFFFFFF; |
sahilmgandhi | 18:6a4db94011d3 | 152 | |
sahilmgandhi | 18:6a4db94011d3 | 153 | /* check for RTCC limitation */ |
sahilmgandhi | 18:6a4db94011d3 | 154 | if((timestamp_ticks - RTCC_CounterGet()) >= 0x80000000) timestamp_ticks = RTCC_CounterGet() + 2; |
sahilmgandhi | 18:6a4db94011d3 | 155 | |
sahilmgandhi | 18:6a4db94011d3 | 156 | /* init channel */ |
sahilmgandhi | 18:6a4db94011d3 | 157 | RTCC_CCChConf_TypeDef ccchConf = RTCC_CH_INIT_COMPARE_DEFAULT; |
sahilmgandhi | 18:6a4db94011d3 | 158 | RTCC_ChannelInit(0,&ccchConf); |
sahilmgandhi | 18:6a4db94011d3 | 159 | /* Set callback */ |
sahilmgandhi | 18:6a4db94011d3 | 160 | RTCC_ChannelCCVSet(0, (uint32_t)timestamp_ticks); |
sahilmgandhi | 18:6a4db94011d3 | 161 | RTCC_IntEnable(RTCC_IF_CC0); |
sahilmgandhi | 18:6a4db94011d3 | 162 | } |
sahilmgandhi | 18:6a4db94011d3 | 163 | |
sahilmgandhi | 18:6a4db94011d3 | 164 | inline void lp_ticker_disable_interrupt() |
sahilmgandhi | 18:6a4db94011d3 | 165 | { |
sahilmgandhi | 18:6a4db94011d3 | 166 | RTCC_IntDisable(RTCC_IF_CC0); |
sahilmgandhi | 18:6a4db94011d3 | 167 | lp_ticker_free(); |
sahilmgandhi | 18:6a4db94011d3 | 168 | } |
sahilmgandhi | 18:6a4db94011d3 | 169 | |
sahilmgandhi | 18:6a4db94011d3 | 170 | inline void lp_ticker_clear_interrupt() |
sahilmgandhi | 18:6a4db94011d3 | 171 | { |
sahilmgandhi | 18:6a4db94011d3 | 172 | RTCC_IntClear(RTCC_IF_CC0); |
sahilmgandhi | 18:6a4db94011d3 | 173 | } |
sahilmgandhi | 18:6a4db94011d3 | 174 | |
sahilmgandhi | 18:6a4db94011d3 | 175 | timestamp_t lp_ticker_read() |
sahilmgandhi | 18:6a4db94011d3 | 176 | { |
sahilmgandhi | 18:6a4db94011d3 | 177 | lp_ticker_init(); |
sahilmgandhi | 18:6a4db94011d3 | 178 | |
sahilmgandhi | 18:6a4db94011d3 | 179 | uint64_t ticks_temp; |
sahilmgandhi | 18:6a4db94011d3 | 180 | uint64_t ticks = RTCC_CounterGet(); |
sahilmgandhi | 18:6a4db94011d3 | 181 | |
sahilmgandhi | 18:6a4db94011d3 | 182 | /* ticks = counter tick value |
sahilmgandhi | 18:6a4db94011d3 | 183 | * timestamp = value in microseconds |
sahilmgandhi | 18:6a4db94011d3 | 184 | * timestamp = ticks * 1.000.000 / RTC frequency |
sahilmgandhi | 18:6a4db94011d3 | 185 | */ |
sahilmgandhi | 18:6a4db94011d3 | 186 | |
sahilmgandhi | 18:6a4db94011d3 | 187 | ticks_temp = (ticks * 1000000) / (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT); |
sahilmgandhi | 18:6a4db94011d3 | 188 | return (timestamp_t) (ticks_temp & 0xFFFFFFFF); |
sahilmgandhi | 18:6a4db94011d3 | 189 | } |
sahilmgandhi | 18:6a4db94011d3 | 190 | |
sahilmgandhi | 18:6a4db94011d3 | 191 | #endif /* RTCC */ |
sahilmgandhi | 18:6a4db94011d3 | 192 | |
sahilmgandhi | 18:6a4db94011d3 | 193 | #endif |