iris/boot-programs/keyboard.ccp

#pypp 0
// Iris: micro-kernel for a capability-based operating system.
// thread0.ccp: Testing userspace thread.
// Copyright 2009 Bas Wijnen <wijnen@debian.org>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include "iris.h"

// GPIO pins for the keyboard://
// Rows = 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 125
// Cols = 0, 1, 2, 3, 4, 5, 6, 7

// Rows: 60...6f; 7d

// Nicely aligned to a port: use rows as output; cols as input.

// Map memory from b0010000, which is really 10010000 in kseg1.

#define D(n)  (*(volatile unsigned *)(0x00 + 0x30 * n + address))
#define DI(n) (*(volatile unsigned *)(0x04 + 0x30 * n + address))
#define PU(n) (*(volatile unsigned *)(0x0c + 0x30 * n + address))
#define AL(n) (*(volatile unsigned *)(0x10 + 0x30 * n + address))
#define AU(n) (*(volatile unsigned *)(0x14 + 0x30 * n + address))
#define IE(n) (*(volatile unsigned *)(0x20 + 0x30 * n + address))

unsigned const address = 0x00010000

static void event (bool release, unsigned row, unsigned col):
	debug_set_led (col * 2 + (release ? 1 : 0))

static void delay ():
	for unsigned i = 0; i < 100000; ++i:
		IE (3) &= ~0x2000ffff

int main ():
	// map memory
	Capability page = memory_create_page (__my_memory)
	alloc_physical (page, 0x10010000, 0)
	memory_map (__my_memory, page, address, 1)

	#if 0
	// Keyboard stuff doesn't seem to work.  Try the simpler part: touchpad buttons.
	IE (0) &= ~0x00012000
	AL (0) &= ~0x0c000000
	AU (0) &= ~0x00000003
	DI (0) &= ~0x00012000
	PU (0) &= ~0x00012000

	unsigned old = 0
	while true:
		unsigned data = D (0) & 0x00012000
		if data == old:
			continue
		if data & ~old & 0x00010000:
			event (true, 0, 0)
		else if ~data & old & 0x00010000:
			event (false, 0, 0)
		if data & ~old & 0x00002000:
			event (true, 1, 1)
		else if ~data & old & 0x00002000:
			event (false, 1, 1)
		old = data
	#else
	// Disable all interrupts.
	IE (3) &= ~0x2000ffff
	IE (0) &= ~0x000001ff

	// Set all to GPIO.
	AL (3) = 0
	AU (3) &= ~0x0c000000
	AL (0) &= ~0x0003ffff

	// Set all rows to input and enable the pull-ups.
	DI (0) &= ~0x000000ff
	PU (0) |= 0x000000ff

	// Set all columns to output, 0.
	DI (3) |= 0x2000ffff
	D (3) &= ~0x2000ffff

	#define NUM_COLS 17
	unsigned keys[NUM_COLS]
	for unsigned i = 0; i < NUM_COLS; ++i:
		keys[i] = 0

	// Pin numbers for the cols, relative to the start of the port (so minus 0x60).
	int const cols[NUM_COLS] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 29 }
	while true:
		// read keyboard
		unsigned data[NUM_COLS]
		for unsigned col = 0; col < NUM_COLS; ++col:
			D (3) &= ~0x2000ffff
			delay ()
			unsigned zero = ~D (0) & 0x000000ff
			D (3) = (D (3) & ~0x2000ffff) | (1 << cols[col])
			delay ()
			data[col] = D (0) & zero

		// Generate events.
		for unsigned col = 0; col < NUM_COLS; ++col:
			for unsigned row = 0; row < 8; ++row:
				if (data[col] ^ keys[col]) & (1 << row):
					event (data[col] & (1 << row), row, col)
			keys[col] = data[col]
		schedule ()
	#endif