samples: fade_led: fix build error when PWM is not enabled (187a8ad0) · Commits · Wenxi XU / zephyr

Some boards may define LEDs but disable them by default due to conflicts with other peripherals. In this case, the new sample code introduced in ("samples: fade_led: use all available LEDs") fails to build with a missing symbol error. Fix this by checking if the PWM device (the parent of the LED alias) is enabled before using it. This implicitly discards invalid aliases. Signed-off-by:

Luca Burelli <l.burelli@arduino.cc>

samples/basic/fade_led/src/main.c

+2 −2

Changes for samples/basic/fade_led/src/main.c: 2 added lines, 2 removed lines.
Original line number	Diff line number	Diff line
		@@ -15,8 +15,8 @@
		#include <zephyr/drivers/pwm.h>

		#define PWM_LED_ALIAS(i) DT_ALIAS(_CONCAT(pwm_led, i))
		#define PWM_LED(i, _) \
		IF_ENABLED(DT_NODE_EXISTS(PWM_LED_ALIAS(i)), (PWM_DT_SPEC_GET(PWM_LED_ALIAS(i)),))
		#define PWM_LED_IS_OKAY(i) DT_NODE_HAS_STATUS_OKAY(DT_PARENT(PWM_LED_ALIAS(i)))
		#define PWM_LED(i, _) IF_ENABLED(PWM_LED_IS_OKAY(i), (PWM_DT_SPEC_GET(PWM_LED_ALIAS(i)),))

		#define MAX_LEDS 10
		static const struct pwm_dt_spec pwm_leds[] = {LISTIFY(MAX_LEDS, PWM_LED, ())};

Admin message