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Color Oled(SSD1331) connect to STMicroelectronics Nucleo-F466
mbed-os/platform/mbed_poll.cpp@0:8fdf9a60065b, 2018-10-10 (annotated)
- Committer:
- kadonotakashi
- Date:
- Wed Oct 10 00:33:53 2018 +0000
- Revision:
- 0:8fdf9a60065b
how to make mbed librry
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kadonotakashi | 0:8fdf9a60065b | 1 | /* mbed Microcontroller Library |
kadonotakashi | 0:8fdf9a60065b | 2 | * Copyright (c) 2017 ARM Limited |
kadonotakashi | 0:8fdf9a60065b | 3 | * |
kadonotakashi | 0:8fdf9a60065b | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
kadonotakashi | 0:8fdf9a60065b | 5 | * you may not use this file except in compliance with the License. |
kadonotakashi | 0:8fdf9a60065b | 6 | * You may obtain a copy of the License at |
kadonotakashi | 0:8fdf9a60065b | 7 | * |
kadonotakashi | 0:8fdf9a60065b | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
kadonotakashi | 0:8fdf9a60065b | 9 | * |
kadonotakashi | 0:8fdf9a60065b | 10 | * Unless required by applicable law or agreed to in writing, software |
kadonotakashi | 0:8fdf9a60065b | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
kadonotakashi | 0:8fdf9a60065b | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
kadonotakashi | 0:8fdf9a60065b | 13 | * See the License for the specific language governing permissions and |
kadonotakashi | 0:8fdf9a60065b | 14 | * limitations under the License. |
kadonotakashi | 0:8fdf9a60065b | 15 | */ |
kadonotakashi | 0:8fdf9a60065b | 16 | #include "mbed_poll.h" |
kadonotakashi | 0:8fdf9a60065b | 17 | #include "FileHandle.h" |
kadonotakashi | 0:8fdf9a60065b | 18 | #if MBED_CONF_RTOS_PRESENT |
kadonotakashi | 0:8fdf9a60065b | 19 | #include "rtos/Kernel.h" |
kadonotakashi | 0:8fdf9a60065b | 20 | #include "rtos/Thread.h" |
kadonotakashi | 0:8fdf9a60065b | 21 | using namespace rtos; |
kadonotakashi | 0:8fdf9a60065b | 22 | #else |
kadonotakashi | 0:8fdf9a60065b | 23 | #include "drivers/Timer.h" |
kadonotakashi | 0:8fdf9a60065b | 24 | #include "drivers/LowPowerTimer.h" |
kadonotakashi | 0:8fdf9a60065b | 25 | #endif |
kadonotakashi | 0:8fdf9a60065b | 26 | |
kadonotakashi | 0:8fdf9a60065b | 27 | namespace mbed { |
kadonotakashi | 0:8fdf9a60065b | 28 | |
kadonotakashi | 0:8fdf9a60065b | 29 | // timeout -1 forever, or milliseconds |
kadonotakashi | 0:8fdf9a60065b | 30 | int poll(pollfh fhs[], unsigned nfhs, int timeout) |
kadonotakashi | 0:8fdf9a60065b | 31 | { |
kadonotakashi | 0:8fdf9a60065b | 32 | /** |
kadonotakashi | 0:8fdf9a60065b | 33 | * TODO Proper wake-up mechanism. |
kadonotakashi | 0:8fdf9a60065b | 34 | * In order to correctly detect availability of read/write a FileHandle, we needed |
kadonotakashi | 0:8fdf9a60065b | 35 | * a select or poll mechanisms. We opted for poll as POSIX defines in |
kadonotakashi | 0:8fdf9a60065b | 36 | * http://pubs.opengroup.org/onlinepubs/009695399/functions/poll.html Currently, |
kadonotakashi | 0:8fdf9a60065b | 37 | * mbed::poll() just spins and scans filehandles looking for any events we are |
kadonotakashi | 0:8fdf9a60065b | 38 | * interested in. In future, his spinning behaviour will be replaced with |
kadonotakashi | 0:8fdf9a60065b | 39 | * condition variables. |
kadonotakashi | 0:8fdf9a60065b | 40 | */ |
kadonotakashi | 0:8fdf9a60065b | 41 | #if MBED_CONF_RTOS_PRESENT |
kadonotakashi | 0:8fdf9a60065b | 42 | uint64_t start_time = 0; |
kadonotakashi | 0:8fdf9a60065b | 43 | if (timeout > 0) { |
kadonotakashi | 0:8fdf9a60065b | 44 | start_time = Kernel::get_ms_count(); |
kadonotakashi | 0:8fdf9a60065b | 45 | } |
kadonotakashi | 0:8fdf9a60065b | 46 | #define TIME_ELAPSED() int64_t(Kernel::get_ms_count() - start_time) |
kadonotakashi | 0:8fdf9a60065b | 47 | #else |
kadonotakashi | 0:8fdf9a60065b | 48 | #if MBED_CONF_PLATFORM_POLL_USE_LOWPOWER_TIMER |
kadonotakashi | 0:8fdf9a60065b | 49 | LowPowerTimer timer; |
kadonotakashi | 0:8fdf9a60065b | 50 | #else |
kadonotakashi | 0:8fdf9a60065b | 51 | Timer timer; |
kadonotakashi | 0:8fdf9a60065b | 52 | #endif |
kadonotakashi | 0:8fdf9a60065b | 53 | if (timeout > 0) { |
kadonotakashi | 0:8fdf9a60065b | 54 | timer.start(); |
kadonotakashi | 0:8fdf9a60065b | 55 | } |
kadonotakashi | 0:8fdf9a60065b | 56 | #define TIME_ELAPSED() timer.read_ms() |
kadonotakashi | 0:8fdf9a60065b | 57 | #endif // MBED_CONF_RTOS_PRESENT |
kadonotakashi | 0:8fdf9a60065b | 58 | |
kadonotakashi | 0:8fdf9a60065b | 59 | int count = 0; |
kadonotakashi | 0:8fdf9a60065b | 60 | for (;;) { |
kadonotakashi | 0:8fdf9a60065b | 61 | /* Scan the file handles */ |
kadonotakashi | 0:8fdf9a60065b | 62 | for (unsigned n = 0; n < nfhs; n++) { |
kadonotakashi | 0:8fdf9a60065b | 63 | FileHandle *fh = fhs[n].fh; |
kadonotakashi | 0:8fdf9a60065b | 64 | short mask = fhs[n].events | POLLERR | POLLHUP | POLLNVAL; |
kadonotakashi | 0:8fdf9a60065b | 65 | if (fh) { |
kadonotakashi | 0:8fdf9a60065b | 66 | fhs[n].revents = fh->poll(mask) & mask; |
kadonotakashi | 0:8fdf9a60065b | 67 | } else { |
kadonotakashi | 0:8fdf9a60065b | 68 | fhs[n].revents = POLLNVAL; |
kadonotakashi | 0:8fdf9a60065b | 69 | } |
kadonotakashi | 0:8fdf9a60065b | 70 | if (fhs[n].revents) { |
kadonotakashi | 0:8fdf9a60065b | 71 | count++; |
kadonotakashi | 0:8fdf9a60065b | 72 | } |
kadonotakashi | 0:8fdf9a60065b | 73 | } |
kadonotakashi | 0:8fdf9a60065b | 74 | |
kadonotakashi | 0:8fdf9a60065b | 75 | if (count) { |
kadonotakashi | 0:8fdf9a60065b | 76 | break; |
kadonotakashi | 0:8fdf9a60065b | 77 | } |
kadonotakashi | 0:8fdf9a60065b | 78 | |
kadonotakashi | 0:8fdf9a60065b | 79 | /* Nothing selected - this is where timeout handling would be needed */ |
kadonotakashi | 0:8fdf9a60065b | 80 | if (timeout == 0 || (timeout > 0 && TIME_ELAPSED() > timeout)) { |
kadonotakashi | 0:8fdf9a60065b | 81 | break; |
kadonotakashi | 0:8fdf9a60065b | 82 | } |
kadonotakashi | 0:8fdf9a60065b | 83 | #ifdef MBED_CONF_RTOS_PRESENT |
kadonotakashi | 0:8fdf9a60065b | 84 | // TODO - proper blocking |
kadonotakashi | 0:8fdf9a60065b | 85 | // wait for condition variable, wait queue whatever here |
kadonotakashi | 0:8fdf9a60065b | 86 | rtos::Thread::wait(1); |
kadonotakashi | 0:8fdf9a60065b | 87 | #endif |
kadonotakashi | 0:8fdf9a60065b | 88 | } |
kadonotakashi | 0:8fdf9a60065b | 89 | return count; |
kadonotakashi | 0:8fdf9a60065b | 90 | } |
kadonotakashi | 0:8fdf9a60065b | 91 | |
kadonotakashi | 0:8fdf9a60065b | 92 | } // namespace mbed |