mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-04 02:20:25 +00:00
28 lines
952 B
Text
28 lines
952 B
Text
|
LED display internal API
|
||
|
|
=======================================
|
||
|
|
|
||
|
|
This README describes the LED display API.
|
||
|
|
|
||
|
|
The API is defined by the include file include/led-display.h
|
||
|
|
|
||
|
|
The first step in to define CONFIG_CMD_DISPLAY in the board config file.
|
||
|
|
Then you need to provide the following functions to access LED display:
|
||
|
|
|
||
|
|
void display_set(int cmd);
|
||
|
|
|
||
|
|
This function should control the state of the LED display. Argument is
|
||
|
|
an ORed combination of the following values:
|
||
|
|
DISPLAY_CLEAR -- clear the display
|
||
|
|
DISPLAY_HOME -- set the position to the beginning of display
|
||
|
|
DISPLAY_MARK -- enable mark (decimal point), if implemented
|
||
|
|
|
||
|
|
int display_putc(char c);
|
||
|
|
|
||
|
|
This function should display it's parameter on the LED display in the
|
||
|
|
current position. Returns the displayed character on success or -1 in
|
||
|
|
case of failure.
|
||
|
|
|
||
|
|
With this functions defined 'display' command will display it's
|
||
|
|
arguments on the LED display (or clear the display if called without
|
||
|
|
arguments).
|