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Led PWM sample #82383

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Led PWM sample #82383

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2312312
samples: led: pwm: add decreasing brightness logic
yishai1999 Dec 1, 2024
37f56d3
samples: pwm: Add overlay for nucleo_l4r5zi board
yishai1999 Dec 1, 2024
9650b5c
samples: led: pwm: Add overlay for stm32f4_disco board
yishai1999 Dec 1, 2024
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4 changes: 4 additions & 0 deletions samples/basic/blinky_pwm/boards/nucleo_l4r5zi.overlay
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,10 @@
status = "okay";
};

&timers1 {
st,prescaler = <10000>;
};

&pwm1 {
status = "okay";
};
1 change: 1 addition & 0 deletions samples/drivers/led/pwm/README.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ For each PWM LEDs (one after the other):
- Turning on
- Turning off
- Increasing brightness gradually
- Decreasing brightness gradually
- Blinking on: 0.1 sec, off: 0.1 sec
- Blinking on: 1 sec, off: 1 sec
- Turning off
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23 changes: 23 additions & 0 deletions samples/drivers/led/pwm/boards/nucleo_l4r5zi.overlay
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
/*
* SPDX-License-Identifier: Apache-2.0
*
* Copyright (c) 2022 STMicroelectronics
*/

/ {
leds {
status = "disabled";
};
};

&pwmleds {
status = "okay";
};

&timers1 {
st,prescaler = <10000>;
};

&pwm1 {
status = "okay";
};
11 changes: 11 additions & 0 deletions samples/drivers/led/pwm/boards/stm32f4_disco.overlay
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@@ -0,0 +1,11 @@
/*
* Copyright (c) 2023 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/

/ {
leds {
status = "disabled";
};
};
1 change: 1 addition & 0 deletions samples/drivers/led/pwm/sample.yaml
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Expand Up @@ -17,6 +17,7 @@ tests:
- "Turned on"
- "Turned off"
- "Increasing brightness gradually"
- "Decreasing brightness gradually"
- "Blinking on: ([0-9]+) msec, off: ([0-9]+) msec"
- "(Blinking on: ([0-9]+) msec, off: ([0-9]+) msec|Cycle period not supported)"
- "Turned off, loop end"
14 changes: 13 additions & 1 deletion samples/drivers/led/pwm/src/main.c
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Expand Up @@ -33,7 +33,7 @@ const int num_leds = ARRAY_SIZE(led_label);
static void run_led_test(const struct device *led_pwm, uint8_t led)
{
int err;
uint16_t level;
int16_t level;

LOG_INF("Testing LED %d - %s", led, led_label[led] ? : "no label");

Expand Down Expand Up @@ -67,6 +67,18 @@ static void run_led_test(const struct device *led_pwm, uint8_t led)
}
k_sleep(K_MSEC(1000));

/* Decrease LED brightness gradually down to the minimum level. */
LOG_INF(" Decreasing brightness gradually");
for (level = MAX_BRIGHTNESS; level >= 0; level--) {
err = led_set_brightness(led_pwm, led, level);
if (err < 0) {
LOG_ERR("err=%d brightness=%d\n", err, level);
return;
}
k_sleep(K_MSEC(CONFIG_FADE_DELAY));
}
k_sleep(K_MSEC(1000));

#if CONFIG_BLINK_DELAY_SHORT > 0
/* Start LED blinking (short cycle) */
err = led_blink(led_pwm, led, CONFIG_BLINK_DELAY_SHORT, CONFIG_BLINK_DELAY_SHORT);
Expand Down