PortOut

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The PortOut interface is used to write to an underlying GPIO port as one value. This is much faster than BusOut as you can write a port in one go, but much less flexible as 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.

Hello World!

Code

// 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);
    }
}

API

PortOut	A multiple pin digital out
Functions
PortOut	Create an PortOut, connected to the specified port
write	Write the value to the output port
read	Read the value currently output on the port
operator=	A shorthand for write
operator int()	A shorthand for read

class PortOut

A multiple pin digital out

PortOut( PortName port,
int mask = 0xFFFFFFFF )

Create an PortOut, connected to the specified port

void write( int value )

Write the value to the output port

int read()

Read the value currently output on the port

PortOut& operator= ( int value )

A shorthand for write

operator int()

A shorthand for read

PortOut

Hello World!

Code

API

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