Module rstubs::arch::pit

The old/historical PIT “Programmable Interval Timer (PIT)”

Structs

• Ctrl 🔒
  Timer control register
• Mode 🔒
  Mode register (only writable)
• Timer
  Historically, PCs had a Timer component of type 8253 or 8254, modern systems come with a compatible chip. Each of these chips provides three 16-bit wide counters (“channel”), each running at a frequency of 1.19318 MHz. The timer’s counting speed is thereby independent from the CPU frequency.

Enums

• Access 🔒
  Access mode
• Operation 🔒
  Operating mode

Constants

• BASE_FREQUENCY 🔒
  Standard frequency in Hz
• CHANNEL 🔒
  We only use PIT channel 2
• CTRL 🔒
• DATA 🔒
• MODE 🔒