| Ilya Yanok | 7f0d241 | 2010-09-09 23:03:32 +0200 | [diff] [blame] | 1 | LED display internal API |
| 2 | ======================================= |
| 3 | |
| 4 | This README describes the LED display API. |
| 5 | |
| 6 | The API is defined by the include file include/led-display.h |
| 7 | |
| 8 | The first step in to define CONFIG_CMD_DISPLAY in the board config file. |
| 9 | Then you need to provide the following functions to access LED display: |
| 10 | |
| 11 | void display_set(int cmd); |
| 12 | |
| 13 | This function should control the state of the LED display. Argument is |
| 14 | an ORed combination of the following values: |
| 15 | DISPLAY_CLEAR -- clear the display |
| 16 | DISPLAY_HOME -- set the position to the beginning of display |
| 17 | DISPLAY_MARK -- enable mark (decimal point), if implemented |
| 18 | |
| 19 | int display_putc(char c); |
| 20 | |
| 21 | This function should display it's parameter on the LED display in the |
| 22 | current position. Returns the displayed character on success or -1 in |
| 23 | case of failure. |
| 24 | |
| 25 | With this functions defined 'display' command will display it's |
| 26 | arguments on the LED display (or clear the display if called without |
| 27 | arguments). |