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PortOut
Mbed OS 2 and Mbed OS 5
This is the handbook for Mbed OS 2. If you’re working with Mbed OS 5, please see the new handbook. For the latest PortOut API, please see 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!¶
Import program
00001 // Toggle all four LEDs 00002 00003 #include "mbed.h" 00004 00005 // LED1 = P1.18 LED2 = P1.20 LED3 = P1.21 LED4 = P1.23 00006 #define LED_MASK 0x00B40000 00007 00008 PortOut ledport(Port1, LED_MASK); 00009 00010 int main() { 00011 while(1) { 00012 ledport = LED_MASK; 00013 wait(1); 00014 ledport = 0; 00015 wait(1); 00016 } 00017 }
API¶
Import librarymbed
Interface¶
The PortOut Interface can use any pins with a blue label, as long as they are in the same GPIO port.
See the Pinout page for more details |