From 7f0d241d5ce8c7d0dff49f74498bf5708002424e Mon Sep 17 00:00:00 2001 From: Ilya Yanok Date: Thu, 9 Sep 2010 23:03:32 +0200 Subject: 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 --- doc/README.LED_display | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 doc/README.LED_display (limited to 'doc/README.LED_display') diff --git a/doc/README.LED_display b/doc/README.LED_display new file mode 100644 index 0000000..521746e --- /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). -- cgit v1.1