mbed libraries for KL25Z
SerialHalfDuplex.h
- Committer:
- emilmont
- Date:
- 2012-11-09
- Revision:
- 8:c14af7958ef5
- Parent:
- 0:8024c367e29f
File content as of revision 8:c14af7958ef5:
/* mbed Microcontroller Library - SerialHalfDuplex * Copyright (c) 2010-2011 ARM Limited. All rights reserved. */ #ifndef MBED_SERIALHALFDUPLEX_H #define MBED_SERIALHALFDUPLEX_H #include "platform.h" #if DEVICE_SERIAL #include "Serial.h" #include "gpio_api.h" namespace mbed { /** A serial port (UART) for communication with other devices using * Half-Duplex, allowing transmit and receive on a single * shared transmit and receive line. Only one end should be transmitting * at a time. * * Both the tx and rx pin should be defined, and wired together. * This is in addition to them being wired to the other serial * device to allow both read and write functions to operate. * * For Simplex and Full-Duplex Serial communication, see Serial() * * Example: * @code * // Send a byte to a second HalfDuplex device, and read the response * * #include "mbed.h" * * // p9 and p10 should be wired together to form "a" * // p28 and p27 should be wired together to form "b" * // p9/p10 should be wired to p28/p27 as the Half Duplex connection * * SerialHalfDuplex a(p9, p10); * SerialHalfDuplex b(p28, p27); * * void b_rx() { // second device response * b.putc(b.getc() + 4); * } * * int main() { * b.attach(&b_rx); * for (int c = 'A'; c < 'Z'; c++) { * a.putc(c); * printf("sent [%c]\n", c); * wait(0.5); // b should respond * if (a.readable()) { * printf("received [%c]\n", a.getc()); * } * } * } * @endcode */ class SerialHalfDuplex : public Serial { public: /** Create a half-duplex serial port, connected to the specified transmit * and receive pins. * * These pins should be wired together, as well as to the target device * * @param tx Transmit pin * @param rx Receive pin */ SerialHalfDuplex(PinName tx, PinName rx); protected: gpio_object gpio; virtual int _putc(int c); virtual int _getc(void); }; // End class SerialHalfDuplex } // End namespace #endif #endif