Device interface library for multiple platforms including Mbed.

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Uart.cpp

00001 /*******************************************************************************
00002 * Copyright (C) Maxim Integrated Products, Inc., All Rights Reserved.
00003 *
00004 * Permission is hereby granted, free of charge, to any person obtaining a
00005 * copy of this software and associated documentation files (the "Software"),
00006 * to deal in the Software without restriction, including without limitation
00007 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
00008 * and/or sell copies of the Software, and to permit persons to whom the
00009 * Software is furnished to do so, subject to the following conditions:
00010 *
00011 * The above copyright notice and this permission notice shall be included
00012 * in all copies or substantial portions of the Software.
00013 *
00014 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
00015 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00016 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
00017 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
00018 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
00019 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
00020 * OTHER DEALINGS IN THE SOFTWARE.
00021 *
00022 * Except as contained in this notice, the name of Maxim Integrated
00023 * Products, Inc. shall not be used except as stated in the Maxim Integrated
00024 * Products, Inc. Branding Policy.
00025 *
00026 * The mere transfer of this software does not imply any licenses
00027 * of trade secrets, proprietary technology, copyrights, patents,
00028 * trademarks, maskwork rights, or any other form of intellectual
00029 * property whatsoever. Maxim Integrated Products, Inc. retains all
00030 * ownership rights.
00031 *******************************************************************************/
00032 
00033 #include <MaximInterfaceCore/Error.hpp>
00034 #include <mbed-os/drivers/Timer.h>
00035 #include "Uart.hpp"
00036 
00037 namespace MaximInterfaceMbed {
00038 
00039 using namespace MaximInterfaceCore;
00040 
00041 static const int timeout_ms = 10000;
00042 
00043 Result<void> Uart::setBaudRate(int_least32_t baudRate) {
00044   serial->baud(baudRate);
00045   return none;
00046 }
00047 
00048 Result<void> Uart::sendBreak() {
00049   serial->send_break();
00050   return none;
00051 }
00052 
00053 Result<void> Uart::clearReadBuffer() {
00054   while (serial->readable()) {
00055     serial->getc();
00056   }
00057   return none;
00058 }
00059 
00060 Result<void> Uart::writeByte(uint_least8_t data) {
00061   if (!serial->writeable()) {
00062     mbed::Timer timer;
00063     timer.start();
00064     while (!serial->writeable()) {
00065       if (timer.read_ms() >= timeout_ms) {
00066         return HardwareError;
00067       }
00068     }
00069   }
00070   serial->putc(data);
00071   return none;
00072 }
00073 
00074 Result<uint_least8_t> Uart::readByte() {
00075   if (!serial->readable()) {
00076     mbed::Timer timer;
00077     timer.start();
00078     while (!serial->readable()) {
00079       if (timer.read_ms() >= timeout_ms) {
00080         return TimeoutError;
00081       }
00082     }
00083   }
00084   return serial->getc();
00085 }
00086 
00087 const error_category & Uart::errorCategory() {
00088   static class : public error_category {
00089   public:
00090     virtual const char * name() const { return "MaximInterfaceMbed.Uart"; }
00091 
00092     virtual std::string message(int condition) const {
00093       switch (condition) {
00094       case HardwareError:
00095         return "Hardware Error";
00096       }
00097       return defaultErrorMessage(condition);
00098     }
00099   } instance;
00100   return instance;
00101 }
00102 
00103 } // namespace MaximInterfaceMbed