BA / Mbed OS BaBoRo_test2

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mbed-os/hal/mbed_critical_section_api.c@0:02dd72d1d465, 2018-04-24 (annotated)

Committer:
borlanic
Date:
Tue Apr 24 11:45:18 2018 +0000
Revision:
0:02dd72d1d465
BaBoRo_test2 - backup 1

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borlanic 0:02dd72d1d465 1 /* mbed Microcontroller Library
borlanic 0:02dd72d1d465 2 * Copyright (c) 2017 ARM Limited
borlanic 0:02dd72d1d465 3 *
borlanic 0:02dd72d1d465 4 * Licensed under the Apache License, Version 2.0 (the "License");
borlanic 0:02dd72d1d465 5 * you may not use this file except in compliance with the License.
borlanic 0:02dd72d1d465 6 * You may obtain a copy of the License at
borlanic 0:02dd72d1d465 7 *
borlanic 0:02dd72d1d465 8 * http://www.apache.org/licenses/LICENSE-2.0
borlanic 0:02dd72d1d465 9 *
borlanic 0:02dd72d1d465 10 * Unless required by applicable law or agreed to in writing, software
borlanic 0:02dd72d1d465 11 * distributed under the License is distributed on an "AS IS" BASIS,
borlanic 0:02dd72d1d465 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
borlanic 0:02dd72d1d465 13 * See the License for the specific language governing permissions and
borlanic 0:02dd72d1d465 14 * limitations under the License.
borlanic 0:02dd72d1d465 15 */
borlanic 0:02dd72d1d465 16 #include "cmsis.h"
borlanic 0:02dd72d1d465 17 #include "hal/critical_section_api.h"
borlanic 0:02dd72d1d465 18 #include "platform/mbed_assert.h"
borlanic 0:02dd72d1d465 19 #include "platform/mbed_toolchain.h"
borlanic 0:02dd72d1d465 20
borlanic 0:02dd72d1d465 21 #include <stdbool.h>
borlanic 0:02dd72d1d465 22
borlanic 0:02dd72d1d465 23 static volatile bool critical_interrupts_enabled = false;
borlanic 0:02dd72d1d465 24 static volatile bool state_saved = false;
borlanic 0:02dd72d1d465 25
borlanic 0:02dd72d1d465 26 static bool are_interrupts_enabled(void)
borlanic 0:02dd72d1d465 27 {
borlanic 0:02dd72d1d465 28 #if defined(__CORTEX_A9)
borlanic 0:02dd72d1d465 29 return ((__get_CPSR() & 0x80) == 0);
borlanic 0:02dd72d1d465 30 #else
borlanic 0:02dd72d1d465 31 return ((__get_PRIMASK() & 0x1) == 0);
borlanic 0:02dd72d1d465 32 #endif
borlanic 0:02dd72d1d465 33 }
borlanic 0:02dd72d1d465 34
borlanic 0:02dd72d1d465 35
borlanic 0:02dd72d1d465 36 MBED_WEAK void hal_critical_section_enter(void)
borlanic 0:02dd72d1d465 37 {
borlanic 0:02dd72d1d465 38 const bool interrupt_state = are_interrupts_enabled();
borlanic 0:02dd72d1d465 39
borlanic 0:02dd72d1d465 40 __disable_irq();
borlanic 0:02dd72d1d465 41
borlanic 0:02dd72d1d465 42 if (state_saved == true) {
borlanic 0:02dd72d1d465 43 return;
borlanic 0:02dd72d1d465 44 }
borlanic 0:02dd72d1d465 45
borlanic 0:02dd72d1d465 46 critical_interrupts_enabled = interrupt_state;
borlanic 0:02dd72d1d465 47 state_saved = true;
borlanic 0:02dd72d1d465 48 }
borlanic 0:02dd72d1d465 49
borlanic 0:02dd72d1d465 50 MBED_WEAK void hal_critical_section_exit(void)
borlanic 0:02dd72d1d465 51 {
borlanic 0:02dd72d1d465 52 #ifndef FEATURE_UVISOR
borlanic 0:02dd72d1d465 53 // Interrupts must be disabled on invoking an exit from a critical section
borlanic 0:02dd72d1d465 54 MBED_ASSERT(!are_interrupts_enabled());
borlanic 0:02dd72d1d465 55 #endif
borlanic 0:02dd72d1d465 56 state_saved = false;
borlanic 0:02dd72d1d465 57
borlanic 0:02dd72d1d465 58 // Restore the IRQs to their state prior to entering the critical section
borlanic 0:02dd72d1d465 59 if (critical_interrupts_enabled == true) {
borlanic 0:02dd72d1d465 60 __enable_irq();
borlanic 0:02dd72d1d465 61 }
borlanic 0:02dd72d1d465 62 }
borlanic 0:02dd72d1d465 63
borlanic 0:02dd72d1d465 64 MBED_WEAK bool hal_in_critical_section(void)
borlanic 0:02dd72d1d465 65 {
borlanic 0:02dd72d1d465 66 return (state_saved == true);
borlanic 0:02dd72d1d465 67 }