Do I need to change the CORE frequency in BCM2835.h

[Geoffrey]

Greetings,

I note that the core frequency is 250MHz in BCM2835.h. I have a new Raspberry PI version B running at 700MHz. It is my understanding that is also the core frequency.

To make the timing critical things like I2C and SPI clocks come out correct do I need to change the CORE variable definition 

 

 #define BCM2835_CORE_CLK_HZ 250000000      

 

to be 700000000?

I have searched hither and yon, but have not been able to find out if this is required. I also assume if I overclock it in the future I might also have to change this variable?

Thanks for any assistance.

Regards,

Geoffrey

[Arjan]

The BCM2835 core is clocked at 250MHz. That is different from the CPU clock.

See also http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf 

Regards, Arjan

Op maandag 27 mei 2013 01:46:03 UTC+2 schreef Geoffrey het volgende:

[Geoffrey]

Thanks, Arjan,

I probably should have known this, but did not. The link you provided is full of interesting information.

Thanks again,

Geof