firmware/drivers/fmradio.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Linus Nielsen Feltzing
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #include "lcd.h"
  20 #include "sh7034.h"
  21 #include "kernel.h"
  22 #include "thread.h"
  23 #include "debug.h"
  24 #include "system.h"
  25
  26 #if CONFIG_TUNER
  27
  28 /* Signals:
  29    DI (Data In)     - PB0 (doubles as data pin for the LCD)
  30    CL (Clock)       - PB1 (doubles as clock for the LCD)
  31    CE (Chip Enable) - PB3 (also chip select for the LCD, but active low)
  32    DO (Data Out)    - PB4
  33 */
  34
  35 /* cute little functions */
  36 #define CE_LO  and_b(~0x08, PBDRL_ADDR)
  37 #define CE_HI  or_b(0x08, PBDRL_ADDR)
  38 #define CL_LO  and_b(~0x02, PBDRL_ADDR)
  39 #define CL_HI  or_b(0x02, PBDRL_ADDR)
  40 #define DO     (PBDR & 0x10)
  41 #define DI_LO  and_b(~0x01, PBDRL_ADDR)
  42 #define DI_HI  or_b(0x01, PBDRL_ADDR)
  43
  44 #define START or_b((0x08 | 0x02), PBDRL_ADDR)
  45
  46 /* delay loop */
  47 #define DELAY   do { int _x; for(_x=0;_x<10;_x++);} while (0)
  48
  49
  50 int fmradio_read(int addr)
  51 {
  52     int i;
  53     int data = 0;
  54
  55     START;
  56
  57     /* First address bit */
  58     CL_LO;
  59     if(addr & 2)
  60         DI_HI;
  61     else
  62         DI_LO;
  63     DELAY;
  64     CL_HI;
  65     DELAY;
  66
  67     /* Second address bit */
  68     CL_LO;
  69     if(addr & 1)
  70         DI_HI;
  71     else
  72         DI_LO;
  73     DELAY;
  74     CL_HI;
  75     DELAY;
  76
  77     for(i = 0; i < 21;i++)
  78     {
  79         CL_LO;
  80         DELAY;
  81         data <<= 1;
  82         data |= (DO)?1:0;
  83         CL_HI;
  84         DELAY;
  85     }
  86
  87     CE_LO;
  88
  89     return data;
  90 }
  91
  92 void fmradio_set(int addr, int data)
  93 {
  94     int i;
  95
  96     /* Include the address in the data */
  97     data |= addr << 21;
  98
  99     START;
 100
 101     for(i = 0; i < 23;i++)
 102     {
 103         CL_LO;
 104         DELAY;
 105         if(data & (1 << 22))
 106             DI_HI;
 107         else
 108             DI_LO;
 109
 110         data <<= 1;
 111         CL_HI;
 112         DELAY;
 113     }
 114
 115     CE_LO;
 116 }
 117
 118 #endif