ESP32 Forum

Posted: **Tue Aug 08, 2017 6:15 pm**

I want to use the Kconfig.projbuild file, there should be a parameter as uint8_t. But this is not possible, only int (or string).

this is working

Code: Select all

config mac
    string "mac"
	default "{0x00, 0x00, 0x00, 0x00, 0x00, 0x00}"

but i want to use this as uint8_t. Int is not working with this syntax. "You have made an invalid entry."

String is the only datatype working. Is it possible to cast this into uint8_t?

Posted: **Thu Aug 10, 2017 9:27 pm**

No one?

Posted: **Thu Aug 10, 2017 11:13 pm**

Parameters in Kconfig.projbuild are constants, if you need you can limit the range

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    config MY_CONFIG_OPTION
        int "My config option"
        range 0 255
        default 64
        help
        Enter the valu which wil be assigned to uint8_t variable

Then use it in your code

Code: Select all

#include sdkconfig.h

uint8_t myvalue = CONFIG_MY_CONFIG_OPTION
....

kconfig-language

Posted: **Thu Aug 10, 2017 11:48 pm**

Right but he wants to do a Mac address so he would have to do a different entry for each octet (type hex) which seems to be the most common method. Or use a string and then convert the string to a byte array. What is the best way to do that at compile time?

Posted: **Fri Aug 11, 2017 11:06 am**

Yeah, i convert it to a byte array, thanks. But i have another problem. I can't get access to this String in my main.c:

My Kconfig.projbuild looks like this

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menu "Settings"

config MAC
    string "mac"
    default "AAAAAAAAAAAA"
    help
        Enter a value

my library "settings.h" looks like this

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#ifndef settings_h
#define settings_h

#define MAC CONFIG_MAC

#endif

At this pont, i get this error

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error: 'MAC' was not declared in this scope

hwo can i link MAC to a variable, which i can use in main.c (for examle CONFIG_MAC)?

Posted: **Sun Aug 13, 2017 11:43 am**

Saskia wrote:
my library "settings.h" looks like this
Code: Select all
#ifndef settings_h
#define settings_h

#define MAC CONFIG_MAC

#endif
At this pont, i get this error
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error: 'MAC' was not declared in this scope
hwo can i link MAC to a variable, which i can use in main.c (for examle CONFIG_MAC)?

where is your library file named "settings.h" `?
is this in a include folder?
have you include this file where you define MAC in the main.c

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#include  "settings.h"

usually is this done by include the config like boris you suggest

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#include sdkconfig.h

uint8_t myvalue = CONFIG_MY_CONFIG_OPTION
....

so you must be sure that you have your own defines and configs included in your code and in your makefile if have different custom code - cause the linker does not know, where you have your settings.h so you must say him where he find your customs defines.

hope this helps

best wishes
rudi

ESP32 Forum

Use uint8_t in Kconfig.projbuild

Use uint8_t in Kconfig.projbuild

Re: Use uint8_t in Kconfig.projbuild

Re: Use uint8_t in Kconfig.projbuild

Re: Use uint8_t in Kconfig.projbuild

Re: Use uint8_t in Kconfig.projbuild

Re: Use uint8_t in Kconfig.projbuild