---
title: "controller.h"
summary: "Communicates with the PS/2 controller chip"
---

**Warning:** This whole code needs to be reworked!

# `PS2_CONTROLLER_DATA_PORT` - macro
The data transmission IO port.

# `PS2_CONTROLLER_STATUS_PORT` - macro
The Status register IO port.

# `PS2_CONTROLLER_COMMAND_PORT` - macro
The command transmission IO port.

# `PS2_CONTROLLER_TIMEOUT` - macro
The amount of cycles the system waits for the controller before cancelling an operation.

# `ps2_controller_init()` - function (void)
Initializes the PS/2 controller and devices.
At the moment it trusts very much stuff blindly.
This needs to be changed.
The osdev wiki has a list of stuff to do while initializing PS/2.

# `ps2_controller_command(command)` - function (uint8_t)
Sends the PS/2 controller a command.

# `ps2_controller_command_with_data(command, data)` - function (uint8_t)
Sends the PS/2 controller a command that needs additional data on the data port.

# `ps2_controller_wait_until_ready_for_input()` - function (bool)
Halts until the status register says that there can be data read, or the timeout is reached.

# `ps2_controller_wait_until_ready_for_output()` - function (bool)
Halts until the status register says that there can be data written, or the timeout is reached.

# `ps2_controller_read_data()` - function (uint8_t)
Reads data from the PS/2 controller.