DT_ALIAS issue

[sleeper]

i have these aliases setup in the .dts file.

aliases {

        red_led         = &led0;

        grn_led         = &led1;

        blu_led         = &led2;

//      led3            = &led3;

//      watchdog0       = &wdt0;

//      mcuboot-led0    = &led0;

//      bootloader-led0 = &led0;

      sw0             = &button0;

//      sw1             = &button1;

//      sw2             = &button2;

//      sw3             = &button3;

//      mcuboot-button0 = &button0;

        red_pwm         = &pwm_led0;

        grn_pwm         = &pwm_led1;

        blu_pwm         = &pwm_led2;

    };

};

so why is this ok

#define SW0_BUTTON           DT_ALIAS(sw0)

#if !DT_NODE_HAS_STATUS(SW0_BUTTON, okay)

#error "Unsupported board: sw0 devicetree alias is not defined"

#endif

 

but this fails compilation with the error "Unsupported board: pwm_led devicetree alias is not defined" ?

#define PWM_RED_LED        DT_ALIAS(red_pwm)

#if !DT_NODE_HAS_STATUS(PWM_RED_LED, okay)

#error "Unsupported board: pwm_led devicetree alias is not defined"

#endif

[Marte Myrvold]

Hi,

Using underscore in devicetree aliases is not allowed. Instead, you should use a hyphen (-):

aliases {
        red-led         = &led0;
        grn-led         = &led1;
        blu-led         = &led2;
        ...
        red-pwm         = &pwm_led0;
        grn-pwm         = &pwm_led1;
        blu-pwm         = &pwm_led2;
    };
};

In DT_ALIAS you should still use underscore:

#define PWM_RED_LED  DT_ALIAS(red_pwm)

Best regards,
Marte

[sleeper]

so change it to this

    aliases {

        red-led         = &led0;

        grn-led         = &led1;

        blu-led         = &led2;

        red-pwm         = &pwm_led0;

        grn-pwm         = &pwm_led1;

        blu-pwm         = &pwm_led2;

    };

this check still fails at compile time

#define PWM_RED_LED DT_ALIAS(red_pwm)

#if !DT_NODE_HAS_STATUS(PWM_RED_LED, okay)

#error "Unsupported board: pwm_led devicetree alias is not defined"

#endif

c:\Users\IMS_DEV\Documents\vscode\cdc_acm_composite\src\led.c:18:2: error: #error "Unsupported board: pwm_led devicetree alias is not defined"
18 | #error "Unsupported board: pwm_led devicetree alias is not defined"
| ^~~~~

[Marte Myrvold]

Hi,

Did you delete the build directory before rebuilding? When making changes to devicetree, you should delete the build directory completely.

I am not able to reproduce the error using your aliases and code. If you still get the error after deleting the build directory, can you upload a project where this can be reproduced so I can test it on my side?

Best regards,
Marte

[sleeper]

build directory ? 

if you delete that, then the build configuration disappears