![](/media/cache/group/Diana_su_nero.jpg.50x50_q85.jpg)
To be tested
Dependencies: Servo AX12_final MX106_not_working comunication_1
SerialHalfDuplex.cpp@1:946c65496383, 2016-04-26 (annotated)
- Committer:
- ilaria
- Date:
- Tue Apr 26 16:46:51 2016 +0000
- Revision:
- 1:946c65496383
aggiunti controlli
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
ilaria | 1:946c65496383 | 1 | /* mbed Microcontroller Library |
ilaria | 1:946c65496383 | 2 | * Copyright (c) 2006-2012 ARM Limited |
ilaria | 1:946c65496383 | 3 | * |
ilaria | 1:946c65496383 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
ilaria | 1:946c65496383 | 5 | * of this software and associated documentation files (the "Software"), to deal |
ilaria | 1:946c65496383 | 6 | * in the Software without restriction, including without limitation the rights |
ilaria | 1:946c65496383 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
ilaria | 1:946c65496383 | 8 | * copies of the Software, and to permit persons to whom the Software is |
ilaria | 1:946c65496383 | 9 | * furnished to do so, subject to the following conditions: |
ilaria | 1:946c65496383 | 10 | * |
ilaria | 1:946c65496383 | 11 | * The above copyright notice and this permission notice shall be included in |
ilaria | 1:946c65496383 | 12 | * all copies or substantial portions of the Software. |
ilaria | 1:946c65496383 | 13 | * |
ilaria | 1:946c65496383 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
ilaria | 1:946c65496383 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
ilaria | 1:946c65496383 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
ilaria | 1:946c65496383 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
ilaria | 1:946c65496383 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
ilaria | 1:946c65496383 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
ilaria | 1:946c65496383 | 20 | * SOFTWARE. |
ilaria | 1:946c65496383 | 21 | * |
ilaria | 1:946c65496383 | 22 | * NOTE: This is an unsupported legacy untested library. |
ilaria | 1:946c65496383 | 23 | */ |
ilaria | 1:946c65496383 | 24 | #include "SerialHalfDuplex.h" |
ilaria | 1:946c65496383 | 25 | |
ilaria | 1:946c65496383 | 26 | #if DEVICE_SERIAL |
ilaria | 1:946c65496383 | 27 | #include "mbed.h" |
ilaria | 1:946c65496383 | 28 | #include "pinmap.h" |
ilaria | 1:946c65496383 | 29 | #include "serial_api.h" |
ilaria | 1:946c65496383 | 30 | #include "gpio_api.h" |
ilaria | 1:946c65496383 | 31 | |
ilaria | 1:946c65496383 | 32 | namespace mbed { |
ilaria | 1:946c65496383 | 33 | |
ilaria | 1:946c65496383 | 34 | SerialHalfDuplex::SerialHalfDuplex(PinName tx, PinName rx, const char *name) |
ilaria | 1:946c65496383 | 35 | : Serial(tx, rx, name) { |
ilaria | 1:946c65496383 | 36 | _txpin = tx; |
ilaria | 1:946c65496383 | 37 | |
ilaria | 1:946c65496383 | 38 | DigitalIn TXPIN(_txpin); // set as input |
ilaria | 1:946c65496383 | 39 | pin_mode(_txpin, PullNone); // no pull |
ilaria | 1:946c65496383 | 40 | pin_function(_txpin, 0); // set as gpio |
ilaria | 1:946c65496383 | 41 | } |
ilaria | 1:946c65496383 | 42 | |
ilaria | 1:946c65496383 | 43 | // To transmit a byte in half duplex mode: |
ilaria | 1:946c65496383 | 44 | // 1. Disable interrupts, so we don't trigger on loopback byte |
ilaria | 1:946c65496383 | 45 | // 2. Set tx pin to UART out |
ilaria | 1:946c65496383 | 46 | // 3. Transmit byte as normal |
ilaria | 1:946c65496383 | 47 | // 4. Read back byte from looped back tx pin - this both confirms that the |
ilaria | 1:946c65496383 | 48 | // transmit has occurred, and also clears the byte from the buffer. |
ilaria | 1:946c65496383 | 49 | // 5. Return pin to input mode |
ilaria | 1:946c65496383 | 50 | // 6. Re-enable interrupts |
ilaria | 1:946c65496383 | 51 | |
ilaria | 1:946c65496383 | 52 | int SerialHalfDuplex::_putc(int c) { |
ilaria | 1:946c65496383 | 53 | int retc; |
ilaria | 1:946c65496383 | 54 | |
ilaria | 1:946c65496383 | 55 | // TODO: We should not disable all interrupts |
ilaria | 1:946c65496383 | 56 | __disable_irq(); |
ilaria | 1:946c65496383 | 57 | |
ilaria | 1:946c65496383 | 58 | serial_pinout_tx(_txpin); |
ilaria | 1:946c65496383 | 59 | |
ilaria | 1:946c65496383 | 60 | Serial::_putc(c); |
ilaria | 1:946c65496383 | 61 | retc = Serial::getc(); // reading also clears any interrupt |
ilaria | 1:946c65496383 | 62 | |
ilaria | 1:946c65496383 | 63 | pin_function(_txpin, 0); |
ilaria | 1:946c65496383 | 64 | |
ilaria | 1:946c65496383 | 65 | __enable_irq(); |
ilaria | 1:946c65496383 | 66 | |
ilaria | 1:946c65496383 | 67 | return retc; |
ilaria | 1:946c65496383 | 68 | } |
ilaria | 1:946c65496383 | 69 | |
ilaria | 1:946c65496383 | 70 | int SerialHalfDuplex::_getc(void) { |
ilaria | 1:946c65496383 | 71 | return Serial::_getc(); |
ilaria | 1:946c65496383 | 72 | } |
ilaria | 1:946c65496383 | 73 | |
ilaria | 1:946c65496383 | 74 | } // End namespace |
ilaria | 1:946c65496383 | 75 | |
ilaria | 1:946c65496383 | 76 | #endif |