Toyomasa Watarai / simple-mbed-cloud-client

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Dependents:  

mbed-cloud-client/update-client-hub/modules/atomic-queue/source/critical-nordic.c@0:276e7a263c35, 2018-07-02 (annotated)

Committer:
MACRUM
Date:
Mon Jul 02 06:30:39 2018 +0000
Revision:
0:276e7a263c35
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MACRUM 0:276e7a263c35 1 // ----------------------------------------------------------------------------
MACRUM 0:276e7a263c35 2 // Copyright 2015-2017 ARM Ltd.
MACRUM 0:276e7a263c35 3 //
MACRUM 0:276e7a263c35 4 // SPDX-License-Identifier: Apache-2.0
MACRUM 0:276e7a263c35 5 //
MACRUM 0:276e7a263c35 6 // Licensed under the Apache License, Version 2.0 (the "License");
MACRUM 0:276e7a263c35 7 // you may not use this file except in compliance with the License.
MACRUM 0:276e7a263c35 8 // You may obtain a copy of the License at
MACRUM 0:276e7a263c35 9 //
MACRUM 0:276e7a263c35 10 // http://www.apache.org/licenses/LICENSE-2.0
MACRUM 0:276e7a263c35 11 //
MACRUM 0:276e7a263c35 12 // Unless required by applicable law or agreed to in writing, software
MACRUM 0:276e7a263c35 13 // distributed under the License is distributed on an "AS IS" BASIS,
MACRUM 0:276e7a263c35 14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
MACRUM 0:276e7a263c35 15 // See the License for the specific language governing permissions and
MACRUM 0:276e7a263c35 16 // limitations under the License.
MACRUM 0:276e7a263c35 17 // ----------------------------------------------------------------------------
MACRUM 0:276e7a263c35 18
MACRUM 0:276e7a263c35 19 #ifdef TARGET_MCU_NRF51
MACRUM 0:276e7a263c35 20
MACRUM 0:276e7a263c35 21 #include <stdint.h> // uint32_t, UINT32_MAX
MACRUM 0:276e7a263c35 22 #include <stddef.h> // NULL
MACRUM 0:276e7a263c35 23 #include <cmsis-core/core_generic.h> //__disable_irq, __enable_irq
MACRUM 0:276e7a263c35 24 #include <assert.h>
MACRUM 0:276e7a263c35 25 #include <stdbool.h>
MACRUM 0:276e7a263c35 26 #include <nrf_soc.h>
MACRUM 0:276e7a263c35 27 #include <nrf_sdm.h>
MACRUM 0:276e7a263c35 28
MACRUM 0:276e7a263c35 29 // Module include
MACRUM 0:276e7a263c35 30 #include "aq_critical.h"
MACRUM 0:276e7a263c35 31
MACRUM 0:276e7a263c35 32 static volatile union {
MACRUM 0:276e7a263c35 33 uint32_t _PRIMASK_state;
MACRUM 0:276e7a263c35 34 uint8_t _sd_state;
MACRUM 0:276e7a263c35 35 } _state = { 0 } ;
MACRUM 0:276e7a263c35 36 static volatile uint32_t _entry_count = 0;
MACRUM 0:276e7a263c35 37 static volatile bool _use_softdevice_routine = false;
MACRUM 0:276e7a263c35 38
MACRUM 0:276e7a263c35 39 void aq_critical_section_enter()
MACRUM 0:276e7a263c35 40 {
MACRUM 0:276e7a263c35 41 // if a critical section has already been entered, just update the counter
MACRUM 0:276e7a263c35 42 if (_entry_count) {
MACRUM 0:276e7a263c35 43 ++_entry_count;
MACRUM 0:276e7a263c35 44 return;
MACRUM 0:276e7a263c35 45 }
MACRUM 0:276e7a263c35 46
MACRUM 0:276e7a263c35 47 // in this path, a critical section has never been entered
MACRUM 0:276e7a263c35 48 uint32_t primask = __get_PRIMASK();
MACRUM 0:276e7a263c35 49
MACRUM 0:276e7a263c35 50 // if interrupts are enabled, try to use the soft device
MACRUM 0:276e7a263c35 51 uint8_t sd_enabled;
MACRUM 0:276e7a263c35 52 if ((primask == 0) && (sd_softdevice_is_enabled(&sd_enabled) == NRF_SUCCESS) && sd_enabled == 1) {
MACRUM 0:276e7a263c35 53 // if the soft device can be use, use it
MACRUM 0:276e7a263c35 54 sd_nvic_critical_region_enter(&_state._sd_state);
MACRUM 0:276e7a263c35 55 _use_softdevice_routine = true;
MACRUM 0:276e7a263c35 56 } else {
MACRUM 0:276e7a263c35 57 // if interrupts where enabled, disable them
MACRUM 0:276e7a263c35 58 if(primask == 0) {
MACRUM 0:276e7a263c35 59 __disable_irq();
MACRUM 0:276e7a263c35 60 }
MACRUM 0:276e7a263c35 61
MACRUM 0:276e7a263c35 62 // store the PRIMASK state, it will be restored at the end of the critical section
MACRUM 0:276e7a263c35 63 _state._PRIMASK_state = primask;
MACRUM 0:276e7a263c35 64 _use_softdevice_routine = false;
MACRUM 0:276e7a263c35 65 }
MACRUM 0:276e7a263c35 66
MACRUM 0:276e7a263c35 67 assert(_entry_count == 0); // entry count should always be equal to 0 at this point
MACRUM 0:276e7a263c35 68 ++_entry_count;
MACRUM 0:276e7a263c35 69 }
MACRUM 0:276e7a263c35 70
MACRUM 0:276e7a263c35 71 void aq_critical_section_exit()
MACRUM 0:276e7a263c35 72 {
MACRUM 0:276e7a263c35 73 assert(_entry_count > 0);
MACRUM 0:276e7a263c35 74 --_entry_count;
MACRUM 0:276e7a263c35 75
MACRUM 0:276e7a263c35 76 // If their is other segments which have entered the critical section, just leave
MACRUM 0:276e7a263c35 77 if (_entry_count) {
MACRUM 0:276e7a263c35 78 return;
MACRUM 0:276e7a263c35 79 }
MACRUM 0:276e7a263c35 80
MACRUM 0:276e7a263c35 81 // This is the last segment of the critical section, state should be restored as before entering
MACRUM 0:276e7a263c35 82 // the critical section
MACRUM 0:276e7a263c35 83 if (_use_softdevice_routine) {
MACRUM 0:276e7a263c35 84 sd_nvic_critical_region_exit(_state._sd_state);
MACRUM 0:276e7a263c35 85 } else {
MACRUM 0:276e7a263c35 86 __set_PRIMASK(_state._PRIMASK_state);
MACRUM 0:276e7a263c35 87 }
MACRUM 0:276e7a263c35 88 }
MACRUM 0:276e7a263c35 89
MACRUM 0:276e7a263c35 90 #endif //TARGET_MCU_NRF51