////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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// Filename: keypad.c
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// Filename: keypad.c
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//
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//
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// Project: CMod S6 System on a Chip, ZipCPU demonstration project
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// Project: CMod S6 System on a Chip, ZipCPU demonstration project
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//
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//
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// Purpose: A device driver (task) for the 16 character keypad.
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// Purpose: A device driver (task) for the 16 character keypad.
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//
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//
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// Creator: Dan Gisselquist, Ph.D.
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// Creator: Dan Gisselquist, Ph.D.
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// Gisselquist Technology, LLC
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// Gisselquist Technology, LLC
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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// Copyright (C) 2015-2016, Gisselquist Technology, LLC
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// Copyright (C) 2015-2017, Gisselquist Technology, LLC
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//
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//
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// This program is free software (firmware): you can redistribute it and/or
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as published
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// modify it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// by the Free Software Foundation, either version 3 of the License, or (at
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// your option) any later version.
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// your option) any later version.
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//
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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// for more details.
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//
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//
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// You should have received a copy of the GNU General Public License along
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// You should have received a copy of the GNU General Public License along
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// with this program. (It's in the $(ROOT)/doc directory, run make with no
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// with this program. (It's in the $(ROOT)/doc directory, run make with no
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// target there if the PDF file isn't present.) If not, see
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// target there if the PDF file isn't present.) If not, see
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// <http://www.gnu.org/licenses/> for a copy.
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// <http://www.gnu.org/licenses/> for a copy.
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//
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//
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// License: GPL, v3, as defined and found on www.gnu.org,
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// License: GPL, v3, as defined and found on www.gnu.org,
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// http://www.gnu.org/licenses/gpl.html
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// http://www.gnu.org/licenses/gpl.html
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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#include "board.h"
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#include "board.h"
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#ifdef ZIPOS
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#ifdef ZIPOS
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#include "../zipos/ktraps.h"
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#include "../zipos/ktraps.h"
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#include "../zipos/kfildes.h"
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#include "../zipos/kfildes.h"
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#endif
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#endif
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static const int keymap[] = {
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static const char keymap[] = {
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0x01,0x02,0x03,0x0a,
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0x01,0x02,0x03,0x0a,
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0x04,0x05,0x06,0x0b,
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0x04,0x05,0x06,0x0b,
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0x07,0x08,0x09,0x0c,
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0x07,0x08,0x09,0x0c,
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0x00,0x0f,0x0e,0x0d
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0x00,0x0f,0x0e,0x0d
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};
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};
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int keypadread(void) {
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int keypadread(void) {
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int row, col, key;
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int row, col, key;
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IOSPACE *sys = (IOSPACE *)IOADDR;
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volatile IOSPACE *const sys = _sys;
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row = sys->io_spio & 0x0f00;
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row = sys->io_spio & 0x0f00;
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if (row != 0x0f00) {
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if (row != 0x0f00) {
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// If a button is still pressed ..
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// If a button is still pressed ..
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//
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//
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// Check columns one and two to see if they were responsible
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// Check columns one and two to see if they were responsible
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// for the button
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// for the button
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sys->io_spio = 0x0cf00;
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sys->io_spio = 0x0cf00;
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// Get the result
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// Get the result
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col = sys->io_spio;
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col = sys->io_spio;
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if ((col&0x0f00)!=0x0f00) {
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if ((col&0x0f00)!=0x0f00) {
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// Column one or two is pressed
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// Column one or two is pressed
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sys->io_spio = 0x0ef00;
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sys->io_spio = 0x0ef00;
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col = sys->io_spio;
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col = sys->io_spio;
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if ((col&0x0f00)!=0x0f00)
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if ((col&0x0f00)!=0x0f00)
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col = 0;
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col = 0;
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else
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else
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col = 1;
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col = 1;
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} else {
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} else {
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// Must be column three or four
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// Must be column three or four
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sys->io_spio = 0x7f00;
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sys->io_spio = 0x7f00;
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col = sys->io_spio;
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col = sys->io_spio;
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if ((col & 0x0f00)!= 0x0f00) // Column 4
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if ((col & 0x0f00)!= 0x0f00) // Column 4
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col = 3;
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col = 3;
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else
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else
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col = 2;
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col = 2;
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} sys->io_spio = 0x0f00; // Reset column pins to zero
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} sys->io_spio = 0x0f00; // Reset column pins to zero
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if (row == (int)(sys->io_spio & 0x0f00)) {
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if (row == (int)(sys->io_spio & 0x0f00)) {
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// The key didn't change, so we might have something
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// The key didn't change, so we might have something
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row >>= 8;
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row >>= 8;
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row &= 0x0f;
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row &= 0x0f;
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row ^= 0x0f;
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row ^= 0x0f;
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// Found the pin
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// Found the pin
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if (row == 1)
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if (row == 1)
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row=0;
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row=0;
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else if (row == 2)
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else if (row == 2)
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row = 1;
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row = 1;
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else if (row == 4)
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else if (row == 4)
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row = 2;
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row = 2;
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else if (row == 8)
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else if (row == 8)
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row = 3;
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row = 3;
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else
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else
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// Two or more buttons were pressed
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// Two or more buttons were pressed
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// -- declare an error
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// -- declare an error
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row = -1;
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row = -1;
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if (row>=0) {
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if (row>=0) {
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key = (row |(col<<2));
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key = (row |(col<<2));
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key = keymap[key];
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key = keymap[key];
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} else key = -1;
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} else key = -1;
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} else key = -1;
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} else key = -1;
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} else key = -1;
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} else key = -1;
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if (sys->io_pic & INT_ENABLE)
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if (sys->io_pic & INT_ENABLE)
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sys->io_pic = INT_ENABLE|INT_KEYPAD;
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sys->io_pic = INT_ENABLE|INT_KEYPAD;
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else sys->io_pic = INT_KEYPAD;
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else sys->io_pic = INT_KEYPAD;
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return key;
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return key;
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}
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}
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void keypad_wait_for_release(void) {
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void keypad_wait_for_release(void) {
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IOSPACE *sys = (IOSPACE *)IOADDR;
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volatile IOSPACE * const sys = _sys;
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sys->io_spio = 0x0f00;
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sys->io_spio = 0x0f00;
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while((sys->io_spio & 0x0f00)!=0x0f00)
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while((sys->io_spio & 0x0f00)!=0x0f00)
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#ifdef ZIPOS
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#ifdef ZIPOS
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wait(0,2);
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wait(0,2);
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#else
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#else
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;
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;
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#endif
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#endif
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}
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}
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#ifdef ZIPOS
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#ifdef ZIPOS
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void keypad_task(void) {
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void keypad_task(void) {
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clear(INT_KEYPAD);
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clear(INT_KEYPAD, 0);
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while(1) {
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while(1) {
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int key;
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int key; char ch;
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wait(INT_KEYPAD,-1); // Automatically clears
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wait(INT_KEYPAD,-1); // Automatically clears
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key = keypadread();
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key = keypadread();
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write(FILENO_STDOUT, &key, 1);
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if (key >= 0) {
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ch = key;
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write(FILENO_STDOUT, &ch, 1);
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}
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// Prepare for the next key
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// Prepare for the next key
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clear(INT_KEYPAD);
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clear(INT_KEYPAD, 0);
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}
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}
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}
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}
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#endif
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#endif
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