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PortOut

Use the PortOut interface to write to an underlying GPIO port as one value. This is much faster than BusOut because you can write a port in one go, but it is much less flexible because you are constrained by the port and bit layout of the underlying GPIO ports.

A mask can be supplied so only certain bits of a port are used, allowing other bits to be used for other interfaces.

PortOut class reference

Public Member Functions
 PortOut (PortName port, int mask=0xFFFFFFFF)
void write (int value)
int read ()
PortOutoperator= (int value)
PortOutoperator= (PortOut &rhs)
 operator int ()

PortOut 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.
 */


// Toggle all four LEDs
 
#include "mbed.h"
 
// LED1 = P1.18  LED2 = P1.20  LED3 = P1.21  LED4 = P1.23
#define LED_MASK 0x00B40000
 
PortOut ledport(Port1, LED_MASK);
 
int main() {
    while(1) {
        ledport = LED_MASK;
        wait(1);
        ledport = 0;
        wait(1);
    }
}
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