2008-03-27 03:40:04 how to operate resister PORTGIO_CLEAR in c language?
sj tian (CHINA)
Message: 53099
I want to set *pPORTGIO_CLEAR = 0x0780; when under VisualDSP, it is ok. but uder uclinux it not ok.
how to operate register PORTGIO_CLEAR in c language under uclinux.
thanks!
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2008-03-27 08:07:47 Re: how to operate resister PORTGIO_CLEAR in c language?
Mike Frysinger (UNITED STATES)
Message: 53131 if you look at the many Blackfin drivers you'll see that we use the form:
bfin_read_MMR() and bfin_write_MMR()
but, there should be no need for you to access any of the PORT registers now as we have peripheral/gpio apis to handle that stuff for you
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2008-03-27 21:46:50 Re: how to operate resister PORTGIO_CLEAR in c language?
sj tian (CHINA)
Message: 53191
thanks!
I need use mang register besides gpio, such as PLL_CTL,PLL_DIV and EBIU_SDRRC etc.. maybe I need use
bfin_write_MMR(), and is there any document describing this functions on your web？ When I use this function,
which .h file in uclinux source file I need inculde.
pls give me a hints, thanks!
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2008-03-27 23:02:48 Re: how to operate resister PORTGIO_CLEAR in c language?
Mike Frysinger (UNITED STATES)
Message: 53202 you should not be accessing core registers such as the PLL or the EBIU. those settings are controlled by U-Boot, or optionally via the kernel configuration menu. kernel drivers should not go mucking with such things.
the bfin_{read,write}_MMR macros behave exactly as you expect. for documentation on MMRs, just consult the HRM. to access any of them, just include blackfin.h.