![](/media/cache/group/Diana_su_nero.jpg.50x50_q85.jpg)
To be tested
Dependencies: Servo AX12_final MX106_not_working comunication_1
Diff: SerialHalfDuplex.cpp
- Revision:
- 1:946c65496383
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SerialHalfDuplex.cpp Tue Apr 26 16:46:51 2016 +0000 @@ -0,0 +1,76 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2012 ARM Limited + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * NOTE: This is an unsupported legacy untested library. + */ +#include "SerialHalfDuplex.h" + +#if DEVICE_SERIAL +#include "mbed.h" +#include "pinmap.h" +#include "serial_api.h" +#include "gpio_api.h" + +namespace mbed { + +SerialHalfDuplex::SerialHalfDuplex(PinName tx, PinName rx, const char *name) + : Serial(tx, rx, name) { + _txpin = tx; + + DigitalIn TXPIN(_txpin); // set as input + pin_mode(_txpin, PullNone); // no pull + pin_function(_txpin, 0); // set as gpio +} + +// To transmit a byte in half duplex mode: +// 1. Disable interrupts, so we don't trigger on loopback byte +// 2. Set tx pin to UART out +// 3. Transmit byte as normal +// 4. Read back byte from looped back tx pin - this both confirms that the +// transmit has occurred, and also clears the byte from the buffer. +// 5. Return pin to input mode +// 6. Re-enable interrupts + +int SerialHalfDuplex::_putc(int c) { + int retc; + + // TODO: We should not disable all interrupts + __disable_irq(); + + serial_pinout_tx(_txpin); + + Serial::_putc(c); + retc = Serial::getc(); // reading also clears any interrupt + + pin_function(_txpin, 0); + + __enable_irq(); + + return retc; +} + +int SerialHalfDuplex::_getc(void) { + return Serial::_getc(); +} + +} // End namespace + +#endif \ No newline at end of file