AT91SAM7 jak hodit hodnoty na pin

[Jiri Bezstarosti]

Synchronous Data Output
Controlling all parallel busses using several PIOs requires two 
successive write operations in the
PIO_SODR and PIO_CODR registers. This may lead to unexpected transient 
values. The PIO
controller offers a direct control of PIO outputs by single write access 
to PIO_ODSR (Output
Data Status Register). Only bits unmasked by PIO_OWSR (Output Write 
Status Register) are
written. The mask bits in the PIO_OWSR are set by writing to PIO_OWER 
(Output Write Enable
Register) and cleared by writing to PIO_OWDR (Output Write Disable 
Register).
After reset, the synchronous data output is disabled on all the I/O 
lines as PIO_OWSR resets at
0x0.

Tolik se pise v PDF ...

Uz to tady prakticky nectu, takze reaguji opravdu nahodou a pokud jak se 
to ma zaznelo, omlouvam se, ale radeji to jeste zopaknu v lidstine a 
cestine. Pokud nastavujete bity vystupu a potrebujete zmenit soucasne na 
1 a 0 a jeste jen nektere bity, pak muzete zapsat do PIO_ODSR v pripade, 
ze je konkretni bit nastaven v PIO_OWSR, coz se provede pres PIO_OWER a 
pripadne smazne PIO_OWDR. Zkratka si hodite masku pres registr PIO_ODSR 
a nastavujete si jen ty piny, ktere chcete a to do jednicek a nul 
zaroven, co je vymaskovano se nezmeni, nema to povolen primy zapis. 
Vypada to zamotane, ale kdyz s tim chvili delate, na ty tuny registru si 
zvyknete a pak uz Vam to ani neprijde ;).

V kazdem pripade si vzdycky projdete PDF (dokumentaci), vyplati se to, 
protoze tady obcas muzete dostat i pekne hrabeci rady :))).

--
Jiri Bezstarosti

Bear John Grills napsal(a):
> S tim nastavenim CODR pred nastavenim SODR jsem spokojen.. diky pomohlo 
> mi to
>