Status LED ======================================== This README describes the status LED API. The API is defined by the include file include/status_led.h The first step is to enable CONFIG_LED_STATUS in menuconfig: > Device Drivers > LED Support. If the LED support is only for specific board, enable CONFIG_LED_STATUS_BOARD_SPECIFIC in the menuconfig. Status LEDS 0 to 5 are enabled by the following configurations at menuconfig: CONFIG_STATUS_LED0, CONFIG_STATUS_LED1, ... CONFIG_STATUS_LED5 The following should be configured for each of the enabled LEDs: CONFIG_STATUS_LED_BIT CONFIG_STATUS_LED_STATE CONFIG_STATUS_LED_FREQ Where is an integer 1 through 5 (empty for 0). CONFIG_STATUS_LED_BIT is passed into the __led_* functions to identify which LED is being acted on. As such, the value choose must be unique with with respect to the other CONFIG_STATUS_LED_BIT's. Mapping the value to a physical LED is the reponsiblity of the __led_* function. CONFIG_STATUS_LED_STATE is the initial state of the LED. It should be set to one of these values: CONFIG_LED_STATUS_OFF or CONFIG_LED_STATUS_ON. CONFIG_STATUS_LED_FREQ determines the LED blink frequency. Values range from 2 to 10. Some other LED macros --------------------- CONFIG_STATUS_LED_BOOT is the LED to light when the board is booting. This must be a valid LED number (0-5). CONFIG_STATUS_LED_RED is the red LED. It is used to signal errors. This must be a valid LED number (0-5). Other similar color LED's macros are CONFIG_STATUS_LED_GREEN, CONFIG_STATUS_LED_YELLOW and CONFIG_STATUS_LED_BLUE. General LED functions --------------------- The following functions should be defined: __led_init is called once to initialize the LED to CONFIG_STATUS_LED_STATE. One time start up code should be placed here. __led_set is called to change the state of the LED. __led_toggle is called to toggle the current state of the LED. Colour LED ======================================== Colour LED's are at present only used by ARM. The functions names explain their purpose. coloured_LED_init red_LED_on red_LED_off green_LED_on green_LED_off yellow_LED_on yellow_LED_off blue_LED_on blue_LED_off These are weakly defined in arch/arm/lib/board.c to noops. Where applicable, define these functions in the board specific source. TBD : Describe older board dependent macros similar to what is done for TBD : Describe general support via asm/status_led.h