diff options
| author | Ilya Yanok <yanok@emcraft.com> | 2010-09-09 23:03:32 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2010-10-12 22:44:33 +0200 |
| commit | 7f0d241d5ce8c7d0dff49f74498bf5708002424e (patch) | |
| tree | b387723c6e648381087103c11e9e95ee28f772a0 /doc/README.LED_display | |
| parent | 9531a2388ccaeaabb33a359a0bbf2e1d792c7dde (diff) | |
led_display: split led display support into generic and hw-dependent parts
Split the display command into generic interface and hardware-specific
realization for PDSP188x LED display found on hmi1001 and manroland
boards. Simple interface for LED displays is defined in
include/led-display.h and described in doc/README.LED_display.
Driver-specific implementation was moved into drivers/misc/pdsp188x.c
file (enabled with CONFIG_PDSP188x set).
Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Diffstat (limited to 'doc/README.LED_display')
| -rw-r--r-- | doc/README.LED_display | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/doc/README.LED_display b/doc/README.LED_display new file mode 100644 index 00000000000..521746e1291 --- /dev/null +++ b/doc/README.LED_display @@ -0,0 +1,27 @@ +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). |