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PortOut
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!¶
// 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¶
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