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 #include "fmradio.h"
  26
  27 #if CONFIG_TUNER
  28
  29 /* Signals:
  30    DI (Data In)     - PB0 (doubles as data pin for the LCD)
  31    CL (Clock)       - PB1 (doubles as clock for the LCD)
  32    CE (Chip Enable) - PB3 (also chip select for the LCD, but active low)
  33    DO (Data Out)    - PB4
  34 */
  35
  36 /* cute little functions */
  37 #define CE_LO  and_b(~0x08, PBDRL_ADDR)
  38 #define CE_HI  or_b(0x08, PBDRL_ADDR)
  39 #define CL_LO  and_b(~0x02, PBDRL_ADDR)
  40 #define CL_HI  or_b(0x02, PBDRL_ADDR)
  41 #define DO     (PBDR & 0x10)
  42 #define DI_LO  and_b(~0x01, PBDRL_ADDR)
  43 #define DI_HI  or_b(0x01, PBDRL_ADDR)
  44
  45 #define START or_b((0x08 | 0x02), PBDRL_ADDR)
  46
  47 /* delay loop */
  48 #define DELAY   do { int _x; for(_x=0;_x<10;_x++);} while (0)
  49
  50
  51 int fmradio_read(int addr)
  52 {
  53     int i;
  54     int data = 0;
  55
  56     START;
  57
  58     /* First address bit */
  59     CL_LO;
  60     if(addr & 2)
  61         DI_HI;
  62     else
  63         DI_LO;
  64     DELAY;
  65     CL_HI;
  66     DELAY;
  67
  68     /* Second address bit */
  69     CL_LO;
  70     if(addr & 1)
  71         DI_HI;
  72     else
  73         DI_LO;
  74     DELAY;
  75     CL_HI;
  76     DELAY;
  77
  78     for(i = 0; i < 21;i++)
  79     {
  80         CL_LO;
  81         DELAY;
  82         data <<= 1;
  83         data |= (DO)?1:0;
  84         CL_HI;
  85         DELAY;
  86     }
  87
  88     CE_LO;
  89
  90     return data;
  91 }
  92
  93 void fmradio_set(int addr, int data)
  94 {
  95     int i;
  96
  97     /* Include the address in the data */
  98     data |= addr << 21;
  99
 100     START;
 101
 102     for(i = 0; i < 23;i++)
 103     {
 104         CL_LO;
 105         DELAY;
 106         if(data & (1 << 22))
 107             DI_HI;
 108         else
 109             DI_LO;
 110
 111         data <<= 1;
 112         CL_HI;
 113         DELAY;
 114     }
 115
 116     CE_LO;
 117 }
 118
 119 #endif