firmware/drivers/tsc2100.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id: $
   9  *
  10  * Copyright (C) 2007 by Jonathan Gordon
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "config.h"
  23 #include "cpu.h"
  24 #include "system.h"
  25 #include "spi.h"
  26 #include "tsc2100.h"
  27
  28 /* Read X, Y, Z1, Z2 touchscreen coordinates. */
  29 void tsc2100_read_values(short *x, short* y, short *z1, short *z2)
  30 {
  31     int page = 0, address = 0;
  32     unsigned short command = 0x8000|(page << 11)|(address << 5);
  33     unsigned char out[] = {command >> 8, command & 0xff};
  34     unsigned char in[8];
  35     spi_block_transfer(SPI_target_TSC2100,
  36                        out, sizeof(out), in, sizeof(in));
  37
  38     *x = (in[0]<<8)|in[1];
  39     *y = (in[2]<<8)|in[3];
  40     *z1 = (in[4]<<8)|in[5];
  41     *z2 = (in[6]<<8)|in[7];
  42 }
  43
  44 short tsc2100_readreg(int page, int address)
  45 {
  46     unsigned short command = 0x8000|(page << 11)|(address << 5);
  47     unsigned char out[] = {command >> 8, command & 0xff};
  48     unsigned char in[2];
  49     spi_block_transfer(SPI_target_TSC2100,
  50                        out, sizeof(out), in, sizeof(in));
  51     return (in[0]<<8)|in[1];
  52 }
  53
  54
  55 void tsc2100_writereg(int page, int address, short value)
  56 {
  57     unsigned short command = (page << 11)|(address << 5);
  58     unsigned char out[4] = {command >> 8, command & 0xff,
  59                             value >> 8,   value & 0xff};
  60     spi_block_transfer(SPI_target_TSC2100,
  61                        out, sizeof(out), NULL, 0);
  62 }
  63
  64 void tsc2100_keyclick(void)
  65 {
  66     // 1100 0100 0001 0000
  67     //short val = 0xC410;
  68     tsc2100_writereg(TSAC2_PAGE, TSAC2_ADDRESS, tsc2100_readreg(TSAC2_PAGE, TSAC2_ADDRESS)&0x8000);
  69 }