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/*
* Copyright (C) 2006 Paul Davis
* Copyright (C) 2007 Michael Taht
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* */
#include <cstring>
#include <tranzport_control_protocol.h>
#include <cstring>
void
TranzportControlProtocol::screen_clear ()
{
const char *blank = " ";
print(0,0,blank);
print(1,0,blank);
}
void TranzportControlProtocol::screen_invalidate ()
{
screen_invalid.set();
for(int row = 0; row < ROWS; row++) {
for(int col = 0; col < COLUMNS; col++) {
screen_current[row][col] = 0x7f;
screen_pending[row][col] = ' ';
screen_flash[row][col] = ' ';
}
}
}
void TranzportControlProtocol::screen_validate ()
{
}
void TranzportControlProtocol::screen_init ()
{
screen_invalidate();
}
// FIXME: Switch to a column oriented flush to make the redraw of the
// meters look better
int
TranzportControlProtocol::screen_flush ()
{
int cell = 0, row=0, col_base, pending = 0;
const unsigned long CELL_BITS = 0x0F;
if ( _device_status == STATUS_OFFLINE) { return (-1); }
std::bitset<ROWS*COLUMNS> mask(CELL_BITS);
std::bitset<ROWS*COLUMNS> imask(CELL_BITS);
for(cell = 0; cell < 10 && pending == 0; cell++) {
mask = imask << (cell*4);
if((screen_invalid & mask).any()) {
/* something in this cell is different, so dump the cell to the device. */
#if DEBUG_TRANZPORT_SCREEN
printf("MASK : %s\n", mask.to_string().c_str());
#endif
if(cell > 4) { row = 1; } else { row = 0; }
col_base = (cell*4)%COLUMNS;
uint8_t cmd[8];
cmd[0] = 0x00;
cmd[1] = 0x01;
cmd[2] = cell;
cmd[3] = screen_pending[row][col_base];
cmd[4] = screen_pending[row][col_base+1];
cmd[5] = screen_pending[row][col_base+2];
cmd[6] = screen_pending[row][col_base+3];
cmd[7] = 0x00;
if((pending = lcd_write(cmd)) == 0) {
/* successful write: copy to current cached display */
screen_invalid &= mask.flip();
memcpy (&screen_current[row][col_base], &screen_pending[row][col_base], 4);
}
}
}
return pending;
}
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