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samples: led: lp5569: demo write_channels

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Add a simple demonstration of the led_write_channels api on the lp5569
driver sample.
The demonstration simply turns on all of the channels with a single call to
led_write_channels. Then the same is done for turning off the channels.
Thus, it doesn't add much visually, but it shows the usage of the api.

Signed-off-by: Emil Dahl Juhl <emdj@bang-olufsen.dk>
This commit is contained in:
Emil Dahl Juhl 2024-11-25 10:35:28 +01:00 • committed by Benjamin Cabé
commit 2df905dc2c
3 changed files with 28 additions and 2 deletions
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1
doc/releases/release-notes-4.1.rst
View file

@ -142,6 +142,7 @@ Drivers and Sensors
* Added a new set of devicetree based LED APIs, see :c:struct:`led_dt_spec`.
* lp5569: added use of auto-increment functionality.
* lp5569: implemented ``write_channels`` api.
* lp5569: demonstrate ``led_write_channels`` in the sample.
* LED Strip

5
samples/drivers/led/lp5569/README.rst
View file

@ -8,7 +8,10 @@ Overview
********
This sample controls 9 LEDs connected to an LP5569 driver. The sample turns
all LEDs on and switches all LEDs off again within a one second interval.
all LEDs on one by one with a 1 second delay between each. Then it fades all
LEDs until they are off again. Afterwards, it turns them all on at once, waits
a second, and turns them all back off.
This pattern then repeats indefinitely.
Building and Running
********************

24
samples/drivers/led/lp5569/src/main.c
View file

@ -18,6 +18,7 @@ LOG_MODULE_REGISTER(app, CONFIG_LED_LOG_LEVEL);
int main(void)
{
const struct device *const led_dev = DEVICE_DT_GET_ANY(ti_lp5569);
uint8_t ch_buf[9] = {0};
int i, ret;
if (!led_dev) {
@ -32,7 +33,8 @@ int main(void)
/*
* Display a continuous pattern that turns on 9 LEDs at 1 s one by
* one until it reaches the end and turns off LEDs in reverse order.
* one until it reaches the end and fades off all LEDs.
* Afterwards, all LEDs get blinked once at the same time.
*/
LOG_INF("Testing 9 LEDs ..");
@ -59,6 +61,26 @@ int main(void)
k_sleep(DELAY_TIME_BREATHING);
}
k_sleep(DELAY_TIME_ON);
/* Turn on all LEDs at once to demonstrate write_channels */
memset(ch_buf, 255, ARRAY_SIZE(ch_buf));
ret = led_write_channels(led_dev, 0, ARRAY_SIZE(ch_buf), ch_buf);
if (ret) {
return ret;
}
k_sleep(DELAY_TIME_ON);
/* Turn off all LEDs at once to demonstrate write_channels */
memset(ch_buf, 0, ARRAY_SIZE(ch_buf));
ret = led_write_channels(led_dev, 0, ARRAY_SIZE(ch_buf), ch_buf);
if (ret) {
return ret;
}
k_sleep(DELAY_TIME_ON);
}
return 0;
}