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/***************************************************************************
avigo.c
Functions to emulate the video hardware of the TI Avigo 10 PDA
***************************************************************************/
#include "emu.h"
#include "includes/avigo.h"
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
/* mem size = 0x017c0 */
/* current column to read/write */
#define AVIGO_VIDEO_DEBUG 0
#define LOG(x) do { if (AVIGO_VIDEO_DEBUG) logerror x; } while (0)
READ8_MEMBER(avigo_state::vid_memory_r)
{
if (!offset)
return m_screen_column;
if ((offset<0x0100) || (offset>=0x01f0) || (m_screen_column >= (AVIGO_SCREEN_WIDTH>>3)))
{
LOG(("vid mem read: %04x\n", offset));
return 0;
}
/* 0x0100-0x01f0 contains data for selected column */
return m_video_memory[m_screen_column + ((offset&0xff)*(AVIGO_SCREEN_WIDTH>>3))];
}
WRITE8_MEMBER(avigo_state::vid_memory_w)
{
if (!offset)
{
/* select column to read/write */
m_screen_column = data;
LOG(("vid mem column write: %02x\n",data));
if (data>=(AVIGO_SCREEN_WIDTH>>3))
{
LOG(("error: vid mem column write: %02x\n",data));
}
return;
}
if ((offset<0x0100) || (offset>=0x01f0) || (m_screen_column >= (AVIGO_SCREEN_WIDTH>>3)))
{
LOG(("vid mem write: %04x %02x\n", offset, data));
return;
}
/* 0x0100-0x01f0 contains data for selected column */
m_video_memory[m_screen_column + ((offset&0xff)*(AVIGO_SCREEN_WIDTH>>3))] = data;
}
void avigo_state::video_start()
{
/* current selected column to read/write */
m_screen_column = 0;
/* allocate video memory */
m_video_memory = machine().memory().region_alloc( "videoram", (AVIGO_SCREEN_WIDTH>>3) * AVIGO_SCREEN_HEIGHT + 1, 1, ENDIANNESS_LITTLE )->base();
memset(m_video_memory, 0, (AVIGO_SCREEN_WIDTH>>3) * AVIGO_SCREEN_HEIGHT + 1);
save_pointer(NAME(m_video_memory), (AVIGO_SCREEN_WIDTH>>3) * AVIGO_SCREEN_HEIGHT + 1);
}
/* Initialise the palette */
void avigo_state::palette_init()
{
palette_set_color(machine(),0,MAKE_RGB(0xff,0xff,0xff)); /* white */
palette_set_color(machine(),1,MAKE_RGB(0x00,0x00,0x00)); /* black */
}
UINT32 avigo_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int y;
int b;
int x;
/* draw avigo display */
for (y=0; y<AVIGO_SCREEN_HEIGHT; y++)
{
int by;
UINT8 *line_ptr = m_video_memory + (y*(AVIGO_SCREEN_WIDTH>>3));
x = 0;
for (by=((AVIGO_SCREEN_WIDTH>>3)-1); by>=0; by--)
{
int px;
UINT8 byte = line_ptr[0];
px = x;
for (b=7; b>=0; b--)
{
bitmap.pix16(y, px) = ((byte>>7) & 0x01);
px++;
byte = byte<<1;
}
x = px;
line_ptr = line_ptr+1;
}
}
return 0;
}
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