From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wolfgang Denk <wd@denx.de>
Date: Thu, 27 Apr 2006 00:20:44 +0200
Subject: [U-Boot-Users] How do you test a bit set/clear from U-Boot command line/script? 
In-Reply-To: Your message of "Wed, 26 Apr 2006 15:50:16 CDT."
             <444FDD08.2010101@orkun.us> 
Message-ID: <E1FYsZZ-00050p-AS@mail.sourceforge.net>
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In message <444FDD08.2010101@orkun.us> you wrote:
>
> I am not asking anything about hardware. Forget I said GPIO. Let's say a 
> value in general memory space. It could be in ram or flash....
> 
> I know I can compare a simple value using itest command. e.g.
> 
> itest *4000 -eq 1234 && echo 'Addr 4000 contains 1234'
> 
> Now my problem is how can I test a bit of 32 bit quantity (say bit 4) 
> stored at location 4000? This is a question about general hush/u-boot 
> shell capability? It is a generic question...

At the moment there is  no  command  that  implements  this.  As  you
probaly  are aware, the "itest" command just implements the following
operations:

op_tbl_t op_table [] = {
        { "-lt", LT },
        { "<"  , LT }, 
        { "-gt", GT },
        { ">"  , GT }, 
        { "-eq", EQ },
        { "==" , EQ }, 
        { "-ne", NE },
        { "!=" , NE }, 
        { "<>" , NE }, 
        { "-ge", GE },
        { ">=" , GE }, 
        { "-le", LE },
        { "<=" , LE }, 
};

Feel free to add new commands for AND, OR, and XOR...

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
"An organization dries up if you don't challenge it with growth."
       - Mark Shepherd, former President and CEO of Texas Instruments