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api/BusInOut.h@128:c31e94a47539, 2016-05-13 (annotated)

Committer:
mbed_official
Date:
Fri May 13 16:00:11 2016 +0100
Revision:
128:c31e94a47539
Parent:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Synchronized with git revision 7bd986845c110b2c4e8bc58739a74757dd6ff493



Full URL: https://github.com/mbedmicro/mbed/commit/7bd986845c110b2c4e8bc58739a74757dd6ff493/



* [STM32F1 F4] Fix #1705 MBED_37



The transmit data register needs to be flushed at the initialisation of

the uart.

In case previous transmission was interrupted by a uart init, uart may

contain a char that will be transmitted at the next start.



This is the case in MBED_37 test (serial_auto_nc_rx).

The MCU is writting {{start}}\n

At the moment of the \n the main program is handling 'new serial'. The

next time the main program is handling a printf, the previous \n is

still present in the uart->DR register and is transmitted.

This cannot happen anymore with this commit



* [STM32_F1] Fix #1705 MBED_37 by resetting the uart

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #ifndef MBED_BUSINOUT_H
bogdanm 0:9b334a45a8ff 17 #define MBED_BUSINOUT_H
bogdanm 0:9b334a45a8ff 18
bogdanm 0:9b334a45a8ff 19 #include "DigitalInOut.h"
bogdanm 0:9b334a45a8ff 20
bogdanm 0:9b334a45a8ff 21 namespace mbed {
bogdanm 0:9b334a45a8ff 22
bogdanm 0:9b334a45a8ff 23 /** A digital input output bus, used for setting the state of a collection of pins
bogdanm 0:9b334a45a8ff 24 */
bogdanm 0:9b334a45a8ff 25 class BusInOut {
bogdanm 0:9b334a45a8ff 26
bogdanm 0:9b334a45a8ff 27 public:
bogdanm 0:9b334a45a8ff 28
bogdanm 0:9b334a45a8ff 29 /** Create an BusInOut, connected to the specified pins
bogdanm 0:9b334a45a8ff 30 *
bogdanm 0:9b334a45a8ff 31 * @param p<n> DigitalInOut pin to connect to bus bit p<n> (p5-p30, NC)
bogdanm 0:9b334a45a8ff 32 *
bogdanm 0:9b334a45a8ff 33 * @note
bogdanm 0:9b334a45a8ff 34 * It is only required to specify as many pin variables as is required
bogdanm 0:9b334a45a8ff 35 * for the bus; the rest will default to NC (not connected)
bogdanm 0:9b334a45a8ff 36 */
bogdanm 0:9b334a45a8ff 37 BusInOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
bogdanm 0:9b334a45a8ff 38 PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
bogdanm 0:9b334a45a8ff 39 PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
bogdanm 0:9b334a45a8ff 40 PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
bogdanm 0:9b334a45a8ff 41
bogdanm 0:9b334a45a8ff 42 BusInOut(PinName pins[16]);
bogdanm 0:9b334a45a8ff 43
bogdanm 0:9b334a45a8ff 44 virtual ~BusInOut();
bogdanm 0:9b334a45a8ff 45
bogdanm 0:9b334a45a8ff 46 /* Group: Access Methods */
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 /** Write the value to the output bus
bogdanm 0:9b334a45a8ff 49 *
bogdanm 0:9b334a45a8ff 50 * @param value An integer specifying a bit to write for every corresponding DigitalInOut pin
bogdanm 0:9b334a45a8ff 51 */
bogdanm 0:9b334a45a8ff 52 void write(int value);
bogdanm 0:9b334a45a8ff 53
bogdanm 0:9b334a45a8ff 54 /** Read the value currently output on the bus
bogdanm 0:9b334a45a8ff 55 *
bogdanm 0:9b334a45a8ff 56 * @returns
bogdanm 0:9b334a45a8ff 57 * An integer with each bit corresponding to associated DigitalInOut pin setting
bogdanm 0:9b334a45a8ff 58 */
bogdanm 0:9b334a45a8ff 59 int read();
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 /** Set as an output
bogdanm 0:9b334a45a8ff 62 */
bogdanm 0:9b334a45a8ff 63 void output();
bogdanm 0:9b334a45a8ff 64
bogdanm 0:9b334a45a8ff 65 /** Set as an input
bogdanm 0:9b334a45a8ff 66 */
bogdanm 0:9b334a45a8ff 67 void input();
bogdanm 0:9b334a45a8ff 68
bogdanm 0:9b334a45a8ff 69 /** Set the input pin mode
bogdanm 0:9b334a45a8ff 70 *
bogdanm 0:9b334a45a8ff 71 * @param mode PullUp, PullDown, PullNone
bogdanm 0:9b334a45a8ff 72 */
bogdanm 0:9b334a45a8ff 73 void mode(PinMode pull);
bogdanm 0:9b334a45a8ff 74
bogdanm 0:9b334a45a8ff 75 /** Binary mask of bus pins connected to actual pins (not NC pins)
bogdanm 0:9b334a45a8ff 76 * If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1
bogdanm 0:9b334a45a8ff 77 *
bogdanm 0:9b334a45a8ff 78 * @returns
bogdanm 0:9b334a45a8ff 79 * Binary mask of connected pins
bogdanm 0:9b334a45a8ff 80 */
bogdanm 0:9b334a45a8ff 81 int mask() {
bogdanm 0:9b334a45a8ff 82 return _nc_mask;
bogdanm 0:9b334a45a8ff 83 }
bogdanm 0:9b334a45a8ff 84
bogdanm 0:9b334a45a8ff 85 #ifdef MBED_OPERATORS
bogdanm 0:9b334a45a8ff 86 /** A shorthand for write()
bogdanm 0:9b334a45a8ff 87 */
bogdanm 0:9b334a45a8ff 88 BusInOut& operator= (int v);
bogdanm 0:9b334a45a8ff 89 BusInOut& operator= (BusInOut& rhs);
bogdanm 0:9b334a45a8ff 90
bogdanm 0:9b334a45a8ff 91 /** Access to particular bit in random-iterator fashion
bogdanm 0:9b334a45a8ff 92 */
bogdanm 0:9b334a45a8ff 93 DigitalInOut& operator[] (int index);
bogdanm 0:9b334a45a8ff 94
bogdanm 0:9b334a45a8ff 95 /** A shorthand for read()
bogdanm 0:9b334a45a8ff 96 */
bogdanm 0:9b334a45a8ff 97 operator int();
bogdanm 0:9b334a45a8ff 98 #endif
bogdanm 0:9b334a45a8ff 99
bogdanm 0:9b334a45a8ff 100 protected:
bogdanm 0:9b334a45a8ff 101 DigitalInOut* _pin[16];
bogdanm 0:9b334a45a8ff 102
bogdanm 0:9b334a45a8ff 103 /** Mask of bus's NC pins
bogdanm 0:9b334a45a8ff 104 * If bit[n] is set to 1 - pin is connected
bogdanm 0:9b334a45a8ff 105 * if bit[n] is cleared - pin is not connected (NC)
bogdanm 0:9b334a45a8ff 106 */
bogdanm 0:9b334a45a8ff 107 int _nc_mask;
bogdanm 0:9b334a45a8ff 108
bogdanm 0:9b334a45a8ff 109 /* disallow copy constructor and assignment operators */
bogdanm 0:9b334a45a8ff 110 private:
bogdanm 0:9b334a45a8ff 111 BusInOut(const BusInOut&);
bogdanm 0:9b334a45a8ff 112 BusInOut & operator = (const BusInOut&);
bogdanm 0:9b334a45a8ff 113 };
bogdanm 0:9b334a45a8ff 114
bogdanm 0:9b334a45a8ff 115 } // namespace mbed
bogdanm 0:9b334a45a8ff 116
bogdanm 0:9b334a45a8ff 117 #endif