my9221.h

Interface for the MY9221 LED controller driver.

enum @140
MY9221_DIR_FWD
forward
MY9221_DIR_REV
backward
enum @141
MY9221_OK
success
MY9221_ERR
failure
MY9221_LED_MAX

Maximum number of distinct LEDs the controller can operate. 

1
(12U)
MY9221_LED_ON

Max brightness value to turn LED full on. 

1
(0xFF)
MY9221_LED_OFF

Min brightness value to turn LED off. 

1
(0x00)
int my9221_init(my9221_t * dev, const my9221_params_t * params)

Initialize the given driver.

Parameters

dev:device descriptor of MY9221 LED controller
params:configuration parameters

Return values

  • 0 on success, otherwise error
void my9221_set_state(my9221_t * dev, const uint8_t * state, uint8_t len)

Set device state.

Note

If state is NULL or len is 0, current device state is set otherwise, current state is overwritten by state.

Parameters

dev:device descriptor of MY9221 LED controller
state:new device state array
len:length of state array

void my9221_set_led(my9221_t * dev, const uint8_t led, const uint8_t alpha)

Set brightness of distinct LED.

Parameters

dev:device descriptor of MY9221 LED controller
led:led number, start with 0
alpha:brightness level for led

void my9221_toggle_led(my9221_t * dev, const uint8_t led)

Toggle a distinct LED.

Parameters

dev:device descriptor of MY9221 LED controller
led:led number, start with 0

struct my9221_params_t

Parameters needed for device initialization.

uint8_t leds

number of LEDs

uint8_t dir

led direction

gpio.h::gpio_t clk

clock gpio pin

gpio.h::gpio_t dat

data gpio pin

struct my9221_t

Device descriptor for MY9221 LED controller.

my9221_params_t params

config parameters

uint8_t state()

state of individual leds