Joan, you're a star... I said it was my misunderstanding.

Thanks

Thank you Joan for showing me the relevant documentation. I had seen elsewhere that the offset addresses to be added to the ARM interrupt register, 0x7E00B00, started at 0x200; for example 0x210 is Enable IRQs 1, and so on. This is what is causing me confusion because the code used by petzval uses o...

Hello I know it is an old post, but the petzval's code was an excellent way of reading the 1MHz system tick counter whilst disabling interrupts in order to get accurate reads. All worked fine until I changed to using the RPI2. I have altered the base address from 0x20000000 to 0x3f000000 (due to the...

Thanks to all of you for your help. I use C and you have pointed me in the right direction.

Regards

Hello

Does anyone know of an update to Joan's excellent method to get the revision number using her function containing:
filp = fopen ("/proc/cpuinfo", "r"); , etc

I now find that this no longer works with the newly released RPI2 board.

Thanks