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-= Puzzle module specification
-
-This folder contains an implementation of the puzzle bus protocol
-specification, and is targeted at puzzle module developers. This document
-describes the required implementation steps for integrating a new game into the
-puzzle module framework.
-
-== The bus
-
-The puzzle bus carries data over a standard I^2^C bus. Additional details about
-this bus can be found in the link:../../docs/design.adoc[Design document].
-
-The following details are important to puzzle module developers, as they may
-cause unexpected behavior:
-
-- *Addresses influence the puzzle box's behavior*. The order of puzzles is
-	determined by the puzzle module address. Two puzzle modules may use the same
-	address, but this will mean that they cannot be used simultaniously in the
-	same puzzle box. Known addresses are documented in link:bus.h[].
-- *The read/write bit of an I^2^C frame determines how it's handled*. I^2^C
-	*read* frames are treated as requests, while *write* frames are treated as
-	responses.
-
-== Puzzle bus driver (pbdrv)
-
-The library in this folder is a partial implementation of the puzzle bus
-specification *for puzzle modules*. Most functions in the driver are marked
-with the 'weak' attribute, which allows you to override them by providing an
-implementation.
-
-In order to utilize this driver, the following must be done:
-
-- The ``pbdrv_i2c_recv`` function must be *called* for every received *I^2^C
-	read* frame
-- The ``pbdrv_i2c_send`` function must be *implemented* with the
-	platform-specific *I^2^C write* function
-
-This is enough to get the puzzle module registered. You may also want to
-implement some of the following integrations:
-
-- If your game uses the global state variable, you should implement the
-	<<sec:state-global,global state hooks>> to point the driver to your own
-	global state variable, and be notified of reads/writes to it.
-- If you want to expose additional game state variables over the puzzle bus,
-	you should implement the <<sec:state-aux,auxiliary state hooks>>.
-- If you want to implement custom puzzle bus commands, you can implement the
-	<<sec:cmd,command hook>>.
-
-All other kinds of integrations/hooks can likely be realized by overriding the
-default implementations, but this is discouraged.
-
-[[sec:state-global]]
-== Global state
-
-If your puzzle module defines its own global ``enum pb_state``, you can tell
-the driver to use it by implementing the ``pbdrv_hook_state_read`` and
-``pbdrv_hook_state_write`` functions. These functions are also used by the
-default implementation of the read/write commands to address 0 (global state).
-
-Example:
-
-```c
-pb_state_t global_state = PB_GS_NOINIT;
-
-pb_state_t pbdrv_hook_mod_state_read() {
-	return global_state;
-}
-
-void pbdrv_hook_mod_state_write(pb_state_t state) {
-	global_state = state;
-}
-```
-
-[[sec:state-aux]]
-== Auxiliary state
-
-You can expose additional state variables by implementing the
-``pbdrv_hook_read`` and ``pbdrv_hook_write`` functions. These functions should
-return ``true`` for state addresses you want to override.
-
-Example:
-
-```c
-#define CUSTOM_VAR_ADDR 0x01
-uint8_t my_custom_variable = 10;
-
-bool pbdrv_hook_read(uint16_t i2c_addr, uint8_t addr) {
-	switch (addr) {
-		case CUSTOM_VAR_ADDR: {
-			char res[] = { PB_CMD_READ, addr, my_custom_variable };
-			pbdrv_i2c_send(i2c_addr, res, sizeof(res));
-			break;
-		}
-		default: return false;
-	}
-
-	return true;
-}
-
-bool pbdrv_hook_write(uint16_t i2c_addr, uint8_t addr, const char * buf, size_t sz) {
-	switch (addr) {
-		case CUSTOM_VAR_ADDR: {
-			if (sz != 1) return false;
-			my_custom_variable = buf[0];
-			break;
-		}
-		default: return false;
-	}
-
-	return true;
-}
-```
-
-[[sec:cmd]]
-== Custom commands
-
-Similar to the auxiliary state, custom commands can be added by implementing
-the ``pbdrv_hook_cmd`` function, which should return ``true`` for the
-command(s) that you want to overwrite.
-
-Example:
-
-```c
-bool pbdrv_hook_cmd(uint16_t i2c_addr, enum pb_cmd cmd, const char * buf, size_t sz) {
-	if (cmd == 0x54) {
-		printf("custom command received!\n");
-		return true;
-	}
-
-	return false;
-}
-```
-