/***************************************************************************

PowerVu D9234 STB (c) 1997 Scientific Atlanta

20-mar-2010 skeleton driver

http://www.vetrun.net/forums/showthread.php?t=395
http://colibri.net63.net/powervu.htm
http://www.growl.de/d9234/

Google 'powervu 9234' for plenty more info.

Meant for payTV providers to decrypt signals from the satellite and pump
them out on a local cable network. The powervu encryption is very secure.

There is a menu system, and with the right equipment, many secrets can
be found!

****************************************************************************/

#include "emu.h"
#include "cpu/arm7/arm7.h"


class pv9234_state : public driver_device
{
public:
	pv9234_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_p_ram(*this, "p_ram"),
		m_maincpu(*this, "maincpu") { }

	DECLARE_WRITE32_MEMBER(debug_w);
	DECLARE_WRITE32_MEMBER(debug1_w);
	DECLARE_WRITE32_MEMBER(debug2_w);
	required_shared_ptr<UINT32> m_p_ram;
	virtual void machine_reset();
	virtual void video_start();
	UINT32 screen_update_pv9234(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	required_device<cpu_device> m_maincpu;
};


/*
This is the serial output to a terminal, used for debugging.
The boot process goes something like this:

Start

Config: 0x00001080 (Max Config: 00003C80)
MV 00000004.00000003
DL Avail
IOP Com. O.K. 00000004
Check CRC ...
CRC O.K.
Launch App
**************
* Ver 2.05 *
**************
Compiled by: FURLANO
Date & time: Nov 3 1997, 15:34:29
All printing enabled. Press space bar to toggle on/off.
Time stamping enabled. Press 't' to turn on/off.
Press 'o' to toggle printing of MPEG Xport error messages.
*/
WRITE32_MEMBER( pv9234_state::debug_w )
{
	if (data)
	{
		printf("%02x %c\n",data,data); // this prints 'Start' to the console.
		logerror("debug=%02x %c\n",data,data);
	}
}

WRITE32_MEMBER( pv9234_state::debug1_w )
{
	UINT8 i,j;
	if (data)
	{
		for (i = 0; i < 4; i++)
		{
			j = (data & 0xff000000) >> 24;
			data <<= 8;
//          printf("%c",j); // this prints 'OFF' to the console.
			logerror("debug1=%02x %c\n",j,j);
		}
//      printf("\n");
	}
}

WRITE32_MEMBER( pv9234_state::debug2_w )
{
	if (data)
		logerror("debug2=%02x\n",data); // ignore the huge amount of zeroes here
}

static ADDRESS_MAP_START(pv9234_map, AS_PROGRAM, 32, pv9234_state)
	// AM_RANGE(0x00000000, 0x00000033) AM_WRITE something
	// AM_RANGE(0x00000044, 0x00000047) AM_WRITE something
	// AM_RANGE(0x00000060, 0x0000006b) AM_WRITE something
	// AM_RANGE(0x00007000, 0x00007003) AM_WRITE something
	// AM_RANGE(0x00008000, 0x00008003) AM_WRITE something
	AM_RANGE(0x00008014, 0x00008017) AM_WRITE(debug1_w)
	// AM_RANGE(0x00008020, 0x00008027) AM_WRITE something
	AM_RANGE(0x000080c0, 0x000080c3) AM_WRITE(debug2_w)
	AM_RANGE(0x000080cc, 0x000080cf) AM_WRITE(debug_w)
	// AM_RANGE(0x000080d0, 0x000080d3) AM_WRITE something
	AM_RANGE(0x0003e000, 0x0003efff) AM_RAM AM_SHARE("p_ram")
	AM_RANGE(0x00000000, 0x0007ffff) AM_ROM AM_REGION("maincpu",0) //FLASH ROM!
	AM_RANGE(0x00080000, 0x00087fff) AM_MIRROR(0x78000) AM_RAM AM_SHARE("share1")//mirror is a guess, writes a prg at 0xc0200 then it jumps at b0200 (!)
	AM_RANGE(0xe0000000, 0xe0007fff) AM_MIRROR(0x0fff8000) AM_RAM AM_SHARE("share1")
	AM_RANGE(0xffffff00, 0xffffffff) AM_RAM //i/o? stack ram?
ADDRESS_MAP_END

/* Input ports */
static INPUT_PORTS_START( pv9234 )
INPUT_PORTS_END


void pv9234_state::machine_reset()
{
	int i;

	for(i=0;i<0x1000/4;i++)
		m_p_ram[i] = 0;
}

void pv9234_state::video_start()
{
}

UINT32 pv9234_state::screen_update_pv9234(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	return 0;
}

static MACHINE_CONFIG_START( pv9234, pv9234_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", ARM7, 4915000) //probably a more powerful clone.
	MCFG_CPU_PROGRAM_MAP(pv9234_map)


	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(50)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_SIZE(640, 480)
	MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1)
	MCFG_SCREEN_UPDATE_DRIVER(pv9234_state, screen_update_pv9234)

	MCFG_PALETTE_LENGTH(2)
	MCFG_PALETTE_INIT_OVERRIDE(driver_device, black_and_white)

MACHINE_CONFIG_END

/* ROM definition */
ROM_START( pv9234 )
	ROM_REGION32_LE( 0x80000, "maincpu", ROMREGION_ERASE00 )
	ROM_LOAD16_BYTE( "u19.bin", 0x00000, 0x20000, CRC(1e06b0c8) SHA1(f8047f7127919e73675375578bb9fcc0eed2178e))
	ROM_LOAD16_BYTE( "u18.bin", 0x00001, 0x20000, CRC(924487dd) SHA1(fb1d7c9a813ded8c820589fa85ae72265a0427c7))
	ROM_LOAD16_BYTE( "u17.bin", 0x40000, 0x20000, CRC(cac03650) SHA1(edd8aec6fed886d47de39ed4e127de0a93250a45))
	ROM_LOAD16_BYTE( "u16.bin", 0x40001, 0x20000, CRC(bd07d545) SHA1(90a63af4ee82b0f7d0ed5f0e09569377f22dd98c))
ROM_END

/* Driver */

/*    YEAR  NAME    PARENT  COMPAT   MACHINE    INPUT    INIT    COMPANY   FULLNAME       FLAGS */
SYST( 1997, pv9234,  0,       0,     pv9234,    pv9234, driver_device,   0,  "Scientific Atlanta", "PowerVu D9234", GAME_NOT_WORKING | GAME_NO_SOUND)
