Fawwaz Nadzmy / mbed-STM

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/TARGET_NORDIC/TARGET_NRF5/nordic_critical.c@153:9398a535854b, 2016-12-22 (annotated)

Committer:
fwndz
Date:
Thu Dec 22 05:12:40 2016 +0000
Revision:
153:9398a535854b
Parent:
149:156823d33999 
device target maximize

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /*
<> 149:156823d33999 2 * Copyright (c) 2015-2016, ARM Limited, All Rights Reserved
<> 149:156823d33999 3 * SPDX-License-Identifier: Apache-2.0
<> 149:156823d33999 4 *
<> 149:156823d33999 5 * Licensed under the Apache License, Version 2.0 (the "License"); you may
<> 149:156823d33999 6 * not use this file except in compliance with the License.
<> 149:156823d33999 7 * You may obtain a copy of the License at
<> 149:156823d33999 8 *
<> 149:156823d33999 9 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 10 *
<> 149:156823d33999 11 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 12 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
<> 149:156823d33999 13 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 14 * See the License for the specific language governing permissions and
<> 149:156823d33999 15 * limitations under the License.
<> 149:156823d33999 16 */
<> 149:156823d33999 17
<> 149:156823d33999 18 #include <stdint.h> // uint32_t, UINT32_MAX
<> 149:156823d33999 19 #include <assert.h> // uint32_t, UINT32_MAX
<> 149:156823d33999 20 #include "cmsis.h"
<> 149:156823d33999 21 #include "nrf_soc.h"
<> 149:156823d33999 22 #include "nrf_sdm.h"
<> 149:156823d33999 23 #include "nrf_nvic.h"
<> 149:156823d33999 24
<> 149:156823d33999 25 static uint8_t _sd_state = 0;
<> 149:156823d33999 26 static volatile uint32_t _entry_count = 0;
<> 149:156823d33999 27
<> 149:156823d33999 28 void core_util_critical_section_enter()
<> 149:156823d33999 29 {
<> 149:156823d33999 30 // if a critical section has already been entered, just update the counter
<> 149:156823d33999 31 if (_entry_count) {
<> 149:156823d33999 32 ++_entry_count;
<> 149:156823d33999 33 return;
<> 149:156823d33999 34 }
<> 149:156823d33999 35
<> 149:156823d33999 36 // in this path, a critical section has never been entered
<> 149:156823d33999 37 // routine of SD V11 work even if the softdevice is not active
<> 149:156823d33999 38 sd_nvic_critical_region_enter(&_sd_state);
<> 149:156823d33999 39
<> 149:156823d33999 40 assert(_entry_count == 0); // entry count should always be equal to 0 at this point
<> 149:156823d33999 41 ++_entry_count;
<> 149:156823d33999 42 }
<> 149:156823d33999 43
<> 149:156823d33999 44 void core_util_critical_section_exit()
<> 149:156823d33999 45 {
<> 149:156823d33999 46 assert(_entry_count > 0);
<> 149:156823d33999 47 --_entry_count;
<> 149:156823d33999 48
<> 149:156823d33999 49 // If their is other segments which have entered the critical section, just leave
<> 149:156823d33999 50 if (_entry_count) {
<> 149:156823d33999 51 return;
<> 149:156823d33999 52 }
<> 149:156823d33999 53
<> 149:156823d33999 54 // This is the last segment of the critical section, state should be restored as before entering
<> 149:156823d33999 55 // the critical section
<> 149:156823d33999 56 sd_nvic_critical_region_exit(_sd_state);
<> 149:156823d33999 57 }