LED API

Functions

The calling sequence is open>turn_on/turn_off/get_status>close

open

int led_open()

Open the LED device, which contains all the LEDs’ service. This operation should be used before other operations.

Parameters

Returns

The result code, >= 0, success; <0 error code.

close

 int led_close()

Close the LED device, which contains all the LEDs’ service. The open and close apis are pair operations. If you don’t want to use this device, you should call the close api to release this device.

Parameters

Returns

The result code, >= 0, success; <0 error code.

turn_on

 int led_on(unsigned int nLedIndex)

Turn on the specified LED.

Parameters

nLedIndex

Index of led, >= 0 && < MAX_LED_COUNT

Returns

The result code, >= 0, success; <0 error code.

turn_off

 int led_off(unsigned int nLedIndex)

Turn off the specified LED.

Parameters

nLedIndex

Index of led, >= 0 && < MAX_LED_COUNT

Returns

The result code, >= 0, success; <0 error code.

get_status

 int led_get_status(unsigned int nLedIndex)

Get the status of the specified LED.

Parameters

nLedIndex

Index of led, >= 0 && < MAX_LED_COUNT

Returns

The result code, > 0, LED on; = 0, LED off; <0 error code.