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Last commit 20 Feb 2019 by 
mbed official
targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/lp_ticker.c@548:1abac31e188e, 2015-05-22 (annotated)
- Committer:
- mbed_official
- Date:
- Fri May 22 10:45:46 2015 +0100
- Revision:
- 548:1abac31e188e
- Parent:
- 525:c320967f86b9
- Child:
- 627:4fa1328d9c60
Synchronized with git revision 88d158e43b54f97c5e94da305ea9a096889cc81b
Full URL: https://github.com/mbedmicro/mbed/commit/88d158e43b54f97c5e94da305ea9a096889cc81b/
Silicon Labs - Cosmetic: apply mbed coding style to HAL
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| mbed_official | 525:c320967f86b9 | 1 | /* mbed Microcontroller Library |
| mbed_official | 525:c320967f86b9 | 2 | * Copyright (c) 2006-2013 ARM Limited |
| mbed_official | 525:c320967f86b9 | 3 | * |
| mbed_official | 525:c320967f86b9 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| mbed_official | 525:c320967f86b9 | 5 | * you may not use this file except in compliance with the License. |
| mbed_official | 525:c320967f86b9 | 6 | * You may obtain a copy of the License at |
| mbed_official | 525:c320967f86b9 | 7 | * |
| mbed_official | 525:c320967f86b9 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| mbed_official | 525:c320967f86b9 | 9 | * |
| mbed_official | 525:c320967f86b9 | 10 | * Unless required by applicable law or agreed to in writing, software |
| mbed_official | 525:c320967f86b9 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| mbed_official | 525:c320967f86b9 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| mbed_official | 525:c320967f86b9 | 13 | * See the License for the specific language governing permissions and |
| mbed_official | 525:c320967f86b9 | 14 | * limitations under the License. |
| mbed_official | 525:c320967f86b9 | 15 | */ |
| mbed_official | 525:c320967f86b9 | 16 | |
| mbed_official | 525:c320967f86b9 | 17 | #include "device.h" |
| mbed_official | 525:c320967f86b9 | 18 | #if DEVICE_LOWPOWERTIMER |
| mbed_official | 525:c320967f86b9 | 19 | |
| mbed_official | 525:c320967f86b9 | 20 | #include "rtc_api.h" |
| mbed_official | 525:c320967f86b9 | 21 | #include "rtc_api_HAL.h" |
| mbed_official | 525:c320967f86b9 | 22 | #include "lp_ticker_api.h" |
| mbed_official | 525:c320967f86b9 | 23 | |
| mbed_official | 525:c320967f86b9 | 24 | void lp_ticker_init() |
| mbed_official | 525:c320967f86b9 | 25 | { |
| mbed_official | 525:c320967f86b9 | 26 | rtc_init_real(RTC_INIT_LPTIMER); |
| mbed_official | 525:c320967f86b9 | 27 | rtc_set_comp0_handler((uint32_t)lp_ticker_irq_handler); |
| mbed_official | 525:c320967f86b9 | 28 | } |
| mbed_official | 525:c320967f86b9 | 29 | |
| mbed_official | 548:1abac31e188e | 30 | void lp_ticker_set_interrupt(timestamp_t timestamp) |
| mbed_official | 548:1abac31e188e | 31 | { |
| mbed_official | 548:1abac31e188e | 32 | uint64_t timestamp_ticks; |
| mbed_official | 525:c320967f86b9 | 33 | uint64_t current_ticks = RTC_CounterGet(); |
| mbed_official | 525:c320967f86b9 | 34 | timestamp_t current_time = ((uint64_t)(current_ticks * 1000000) / (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT)); |
| mbed_official | 548:1abac31e188e | 35 | |
| mbed_official | 548:1abac31e188e | 36 | |
| mbed_official | 525:c320967f86b9 | 37 | /* calculate offset value */ |
| mbed_official | 525:c320967f86b9 | 38 | timestamp_t offset = timestamp - current_time; |
| mbed_official | 525:c320967f86b9 | 39 | if(offset > 0xEFFFFFFF) offset = 100; |
| mbed_official | 548:1abac31e188e | 40 | |
| mbed_official | 525:c320967f86b9 | 41 | /* map offset to RTC value */ |
| mbed_official | 548:1abac31e188e | 42 | // ticks = offset * RTC frequency div 1000000 |
| mbed_official | 548:1abac31e188e | 43 | timestamp_ticks = ((uint64_t)offset * (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT)) / 1000000; |
| mbed_official | 525:c320967f86b9 | 44 | timestamp_ticks += current_ticks; |
| mbed_official | 525:c320967f86b9 | 45 | |
| mbed_official | 548:1abac31e188e | 46 | /* RTC has 24 bit resolution */ |
| mbed_official | 548:1abac31e188e | 47 | timestamp_ticks &= 0xFFFFFF; |
| mbed_official | 525:c320967f86b9 | 48 | |
| mbed_official | 525:c320967f86b9 | 49 | /* check for RTC limitation */ |
| mbed_official | 525:c320967f86b9 | 50 | if((timestamp_ticks - RTC_CounterGet()) >= 0x800000) timestamp_ticks = RTC_CounterGet() + 2; |
| mbed_official | 548:1abac31e188e | 51 | |
| mbed_official | 548:1abac31e188e | 52 | /* Set callback */ |
| mbed_official | 548:1abac31e188e | 53 | RTC_FreezeEnable(true); |
| mbed_official | 548:1abac31e188e | 54 | RTC_CompareSet(0, (uint32_t)timestamp_ticks); |
| mbed_official | 548:1abac31e188e | 55 | RTC_IntEnable(RTC_IF_COMP0); |
| mbed_official | 548:1abac31e188e | 56 | RTC_FreezeEnable(false); |
| mbed_official | 525:c320967f86b9 | 57 | } |
| mbed_official | 525:c320967f86b9 | 58 | |
| mbed_official | 548:1abac31e188e | 59 | inline void lp_ticker_disable_interrupt() |
| mbed_official | 548:1abac31e188e | 60 | { |
| mbed_official | 548:1abac31e188e | 61 | RTC_IntDisable(RTC_IF_COMP0); |
| mbed_official | 525:c320967f86b9 | 62 | } |
| mbed_official | 525:c320967f86b9 | 63 | |
| mbed_official | 548:1abac31e188e | 64 | inline void lp_ticker_clear_interrupt() |
| mbed_official | 548:1abac31e188e | 65 | { |
| mbed_official | 548:1abac31e188e | 66 | RTC_IntClear(RTC_IF_COMP0); |
| mbed_official | 525:c320967f86b9 | 67 | } |
| mbed_official | 525:c320967f86b9 | 68 | |
| mbed_official | 548:1abac31e188e | 69 | timestamp_t lp_ticker_read() |
| mbed_official | 548:1abac31e188e | 70 | { |
| mbed_official | 548:1abac31e188e | 71 | uint64_t ticks_temp; |
| mbed_official | 548:1abac31e188e | 72 | uint64_t ticks = RTC_CounterGet(); |
| mbed_official | 525:c320967f86b9 | 73 | |
| mbed_official | 548:1abac31e188e | 74 | /* ticks = counter tick value |
| mbed_official | 548:1abac31e188e | 75 | * timestamp = value in microseconds |
| mbed_official | 548:1abac31e188e | 76 | * timestamp = ticks * 1.000.000 / RTC frequency |
| mbed_official | 548:1abac31e188e | 77 | */ |
| mbed_official | 525:c320967f86b9 | 78 | |
| mbed_official | 548:1abac31e188e | 79 | ticks_temp = (ticks * 1000000) / (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT); |
| mbed_official | 548:1abac31e188e | 80 | return (timestamp_t) (ticks_temp & 0xFFFFFFFF); |
| mbed_official | 525:c320967f86b9 | 81 | } |
| mbed_official | 525:c320967f86b9 | 82 | |
| mbed_official | 525:c320967f86b9 | 83 | #endif |
