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hp39kbd.c
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hp39kbd.c
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/* HP 39g+ / 39gs / 40gs series keyboard input module
Copyright (C) 2005 The HP-GCC Development Team
Copyright (C) 2016 Arnie97
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 2 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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "s3c2410.h"
#include "hp39kbd.h"
#include "main.h"
void __keybdelay()
{
// REPLACE BY SOMETHING MORE SOPHISTICATED LATER
int k;
for(k=0;k<100;++k) ;
}
void keyb_getmatrix(keymatrix *m)
{
// // by Claudio, with portions (well, most of it) of code by Al
int lo = 0, hi = 0;
int col;
unsigned int control;
for (col = 7; col >= 4; --col) {
control = 1 << ((col + 8) * 2); //set the correct col pin to output, others inputs
control = control | 0xAAA9; //fix up the lower bits
*GPGCON = control; // write the new control value.
// DELAY 100us APPROX.
__keybdelay();
hi = (hi << 8) | ((~( *GPGDAT)) & 0xfe);
}
for (; col >= 0; --col) {
control = 1 << ((col + 8) * 2); //set the correct col pin to output, others inputs
control = control | 0xAAA9; //fix up the lower bits
*GPGCON = control; // write the new control value.
// DELAY 100us APPROX.
__keybdelay();
lo = (lo << 8) | ((~( *GPGDAT)) & 0xfe);
}
*GPGCON = 0x5555AAA9; //restore default
hi |= ((*GPFDAT) & 0x70) << 24;
hi |= (*GPFDAT) << 31;
m->words[0] = lo;
m->words[1] = hi;
return;
}
int get_1st_key(int wait) {
keymatrix m;
if(wait) {
// wait for a non-shift key to be pressed
// while( ((m.words[0]&0x8fffffff)|m.words[1] )==0 ) keyb_getmatrix(&m);
while (!any_key_pressed);
}
keyb_getmatrix(&m);
for (int i = 0; i < 64; ++i)
{
if (m.full & (((ULONGLONG)1)<<i))
{
return i;
}
}
return get_1st_key(wait);
}
int
get_key(void)
{
// wait until a key is pressed
while (!any_key_pressed);
// deal with the modifier keys
if (comma_pressed) {
return event_handler(3, 4);
} else if (alpha_pressed) {
return event_handler(4, 4);
} else if (shift_pressed) {
return event_handler(5, 4);
} else if (on_pressed) {
return event_handler(6, 4);
}
else if (!any_normal_key_pressed) {
return 0;
}
for (unsigned c = 0; c < 8; c++) {
// set the current column pin to output, others inputs
*GPGCON = (1 << 16 << c * 2) | 0xAAA9;
delay(100);
// skip this column if no key in it is pressed
if (!any_key_pressed) {
continue;
}
for (unsigned r = 0; r < 8; r++) {
// check whether a row is active
if (!(*GPGDAT & (1 << r + 1))) {
// restore all column pins to output
*GPGCON = 0x5555AAA9;
delay(100);
// return at the first detected key press
return event_handler(r, c);
}
}
}
// the key was released before it could be captured, hence try again
return get_key();
}