I evaluated the cop interrupts in the current rockbox software:
After enabling the interrupts on the cop (resetting bit7 in the corresponding cpsr)
The TIMER1 interrupts correctly lead to a call to irq().
But there are two interesting things:
1. During the measurement period the corresponding COP_INT_STAT does not always show the bit0 set.
In fact neither COP_INT_STAT nor COP_HI_INT_STAT is set. But the timings of the irq()-calls correspond
to the TIMER1 interrupts.
2. Pushing a key or moving the scroll wheel sets the HI_INT_STAT (and only this register) to 0x40.
 
Received on 2007-05-08