Lancaster University / mbed-src

Lancaster University's (short term!) clone of mbed-src for micro:bit. This is a copy of the github branch https://github.com/lancaster-university/mbed-classic

Fork of mbed-src by mbed official

common/assert.c@641:be9b2017785a, 2016-07-13 (annotated)

Committer:
LancasterUniversity
Date:
Wed Jul 13 12:52:54 2016 +0100
Revision:
641:be9b2017785a
Parent:
591:474d026f7d79 
Synchronized with git rev 1fb8ab4c

Author: James Devine

mbed-classic: BUGFIX for timer when using wait_ms from interrupt context



Previously if a user used wait[_ms,_us] in interrupt context the device would

hang indefinitely. This was due to incrementing overflowCount from

interrupt context only.



This meant that if a user used wait[_ms,_us] in an ISR with

the same or greater interrupt priority, it would result in an infinite

loop as the overflowCount variable would never be incremented, and

wait[_ms,_us] would never return.



This patch simply applies a better solution for the race condition

mentioned in the previous commit. It instead disables the timer1

interrupt and increments the overflowCount variable, preventing

the race condition whilst supporting wait[_ms,_us] in interrupt

context.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 227:7bd0639b8911 1 /* mbed Microcontroller Library
mbed_official 227:7bd0639b8911 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 227:7bd0639b8911 3 *
mbed_official 227:7bd0639b8911 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 227:7bd0639b8911 5 * you may not use this file except in compliance with the License.
mbed_official 227:7bd0639b8911 6 * You may obtain a copy of the License at
mbed_official 227:7bd0639b8911 7 *
mbed_official 227:7bd0639b8911 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 227:7bd0639b8911 9 *
mbed_official 227:7bd0639b8911 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 227:7bd0639b8911 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 227:7bd0639b8911 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 227:7bd0639b8911 13 * See the License for the specific language governing permissions and
mbed_official 227:7bd0639b8911 14 * limitations under the License.
mbed_official 227:7bd0639b8911 15 */
mbed_official 227:7bd0639b8911 16 #include "mbed_assert.h"
mbed_official 591:474d026f7d79 17 #include "mbed_error.h"
mbed_official 227:7bd0639b8911 18
mbed_official 227:7bd0639b8911 19 void mbed_assert_internal(const char *expr, const char *file, int line)
mbed_official 227:7bd0639b8911 20 {
mbed_official 591:474d026f7d79 21 error("mbed assertation failed: %s, file: %s, line %d \n", expr, file, line);
mbed_official 227:7bd0639b8911 22 }