Create RTC

Create a realtime clock.

The realtime clock should have a time of day output, as well as an interrupt with programmable frequency.

changed milestone to %Initial Kernel

added Functionality Hardware labels

created branch 11-create-rtc to address this issue

mentioned in merge request !40 (merged)

assigned to @bslathi19

added 1 design

Because there a 5 registers, each of which are probably 32 bits, It makes sense to do a similar thing to the interrupt controller where we use 1 byte of address space for the address and another for the data. It is slower, but much more efficient (2 vs 20+)

We can have the commands be simple: upper 4 bits for which register, and lower 4 bits for byte position in the register. This means the rtc is expandable up to 128 bits, but we probably won't do that.

updated 1 design

Quick add, I also put in a control register where bit 0 is a global enable, and bit 1 is an irq enable.

mentioned in commit cad6e800

closed with merge request !40 (merged)