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From: bugzilla-daemon@bugs.ecos.sourceware.org
To: ecos-bugs@ecos.sourceware.org
Subject: [Bug 1001442] New: LPC17XX bit band macro proposal
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X-Bugzilla-Who: bernard.fouche@kuantic.com
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Date: Wed, 04 Jan 2012 09:52:00 -0000
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           Summary: LPC17XX bit band macro proposal
           Product: eCos
           Version: CVS
          Platform: Other (please specify)
        OS/Version: Cortex-M
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: low
         Component: HAL
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: bernard.fouche@kuantic.com
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


If ever bit band macros can make it into eCos, here is a proposal.

Beside the gain in speed, IMHO the real advantage is to avoid race conditions
that can occur in a memory/register area that concerns more than one
peripheral.

For instance:

- peripheral power control register.
- ADC channel selection register (see for instance bug #1001437)

For GPIO bit band avoids having to select FIOSET or FIOCLR according to the bit
value to write.

(Maybe the proposed macro names are ugly, not located in the correct file,
etc...)

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