Libraries
Background
pri2LED.c – LED device I/O functions
A function to effect an action on, or query, an LED (assumed to be board-mounted).LED numbering is arbitrary, but if there is one or more board LEDs then one should be accessible as ‘LED 1’.
If there is only the one LED on the board and documentation suggests that it be called ‘LED 0’ then it is recommended that both num=0 and num=1 map to the same LED.
| One function | |
|---|---|
| ledIO | effect an I/O action on a LED |
ledIO – effect an I/O action on a LED
int ledIO(int num, uint action);
num – number of the LED (board-defined)
action – one of LED_ON, _OFF, _INVERT, _QUERY
returns the previous value of the LED (0 or 1), or −1 if num or action is invalid
This maps the board LEDs as follows:
num=0: LED0
num=1: LED1