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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "lcd.h"
#include "sh7034.h"
#include "kernel.h"
#include "thread.h"
#include "debug.h"
#ifdef HAVE_FMRADIO
/* Signals:
DI (Data In) - PB0 (doubles as data pin for the LCD)
CL (Clock) - PB1 (doubles as clock for the LCD)
CE (Chip Enable) - PB3 (also chip select for the LCD, but active low)
DO (Data Out) - PB4
*/
#define PB0 0x0001
#define PB1 0x0002
#define PB3 0x0008
#define PB4 0x0010
/* cute little functions */
#define CE_LO (PBDR &= ~PB3)
#define CE_HI (PBDR |= PB3)
#define CL_LO (PBDR &= ~PB1)
#define CL_HI (PBDR |= PB1)
#define DO (PBDR & PB4)
#define DI_LO (PBDR &= ~PB0)
#define DI_HI (PBDR |= PB0)
#define START (PBDR |= (PB3 | PB1))
/* delay loop */
#define DELAY do { int _x; for(_x=0;_x<10;_x++);} while (0)
static int fmstatus = 0;
int fmradio_read(int addr)
{
int i;
int data = 0;
START;
/* First address bit */
CL_LO;
if(addr & 2)
DI_HI;
else
DI_LO;
DELAY;
CL_HI;
DELAY;
/* Second address bit */
CL_LO;
if(addr & 1)
DI_HI;
else
DI_LO;
DELAY;
CL_HI;
DELAY;
for(i = 0; i < 21;i++)
{
CL_LO;
DELAY;
data <<= 1;
data |= (DO)?1:0;
CL_HI;
DELAY;
}
CE_LO;
return data;
}
void fmradio_set(int addr, int data)
{
int i;
/* Include the address in the data */
data |= addr << 21;
START;
for(i = 0; i < 23;i++)
{
CL_LO;
DELAY;
if(data & (1 << 22))
DI_HI;
else
DI_LO;
data <<= 1;
CL_HI;
DELAY;
}
CE_LO;
}
void fmradio_set_status(int status)
{
fmstatus = status;
}
int fmradio_get_status(void)
{
return fmstatus;
}
#endif
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