help in c keil ARM uvision

[5282604]

in this code for at91sam9

AT91C_BASE_PIOA->PIO_SODR = led_mask[i] ;

i'm beginner in c language AND what is purpose from ->

  AT91C_BASE_SYS->PITC_PIMR |= AT91C_PITC_PITEN;

in this code

what is purpose from
|=

thank's

 

[tosohal]

The assignment to the variable PITC_PIMR is made short by the notation '|='

AT91C_BASE_SYS->PITC_PIMR |= AT91C_PITC_PITEN; is as good as

AT91C_BASE_SYS->PITC_PIMR = AT91C_BASE_SYS->PITC_PIMR | AT91C_PITC_PITEN;

 

[5282604]

The assignment to the variable PITC_PIMR is made short by the notation '|='

AT91C_BASE_SYS->PITC_PIMR |= AT91C_PITC_PITEN; is as good as

AT91C_BASE_SYS->PITC_PIMR = AT91C_BASE_SYS->PITC_PIMR | AT91C_PITC_PITEN;

thank you :-D

but what is purpose from ->

:-D:-D:-D:-D

 

[tosohal]

The -> de references the object PITC_PIMR of the structure pointed by the AT91C_BASE_SYS. So you can access the member of the structure object through '->'
I wish you good luck.