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BusInOut

BusInOut class hierarchy

Use the BusInOut interface as a bidirectional bus that supports up to 16 DigitalInOut pins that you can read and write as one value.

You can use any of the numbered Arm Mbed pins as a DigitalInOut.

Tip:

The order of pins in the constructor is the reverse order of the pins in the byte order. If you have BusInOut(a,b,c,d,e,f,g,h), then the order of bits in the byte is hgfedcba with a being bit 0, b being bit 1, c being bit 2 and so on.

BusInOut class reference

Public Member Functions
 BusInOut (PinName p0, PinName p1=NC, PinName p2=NC, PinName p3=NC, PinName p4=NC, PinName p5=NC, PinName p6=NC, PinName p7=NC, PinName p8=NC, PinName p9=NC, PinName p10=NC, PinName p11=NC, PinName p12=NC, PinName p13=NC, PinName p14=NC, PinName p15=NC)
 BusInOut (PinName pins[16])
void write (int value)
int read ()
void output ()
void input ()
void mode (PinMode pull)
int mask ()
BusInOutoperator= (int v)
BusInOutoperator= (BusInOut &rhs)
DigitalInOutoperator[] (int index)
 operator int ()
Protected Member Functions
virtual void lock ()
virtual void unlock ()
Protected Attributes
DigitalInOut_pin [16]
int _nc_mask
PlatformMutex _mutex

BusInOut Hello World!

/* mbed Example Program
 * Copyright (c) 2006-2014 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "mbed.h"
 
BusInOut pins(D0, D1, D2);
 
int main() {
    while(1) {
        pins.output();
        pins = 0x3;
        wait(1);
        pins.input();
        wait(1);
        if(pins == 0x6) {
            printf("Hello!\n");
        }
    }
}
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