firmware/target/arm/as3525/sansa-clipplus/lcd-clip-plus.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2008 François Dinel
  11  * Copyright (C) 2008-2009 Rafaël Carré
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22 #include "config.h"
  23
  24 #include "lcd.h"
  25 #include "system.h"
  26 #include "cpu.h"
  27
  28 void lcd_hw_init(void)
  29 {
  30     CGU_PERI |= CGU_SSP_CLOCK_ENABLE;
  31
  32     SSP_CPSR = AS3525_SSP_PRESCALER;    /* OF = 0x10 */
  33     SSP_CR0 = (1<<7) | (1<<6) | 7;  /* Motorola SPI frame format, 8 bits */
  34     SSP_CR1 = (1<<3) | (1<<1);  /* SSP Operation enabled */
  35     SSP_IMSC = 0;       /* No interrupts */
  36
  37     GPIOA_DIR |= (1<<5);
  38     GPIOB_DIR |= (1<<2) | (1<<7);
  39     GPIOB_PIN(7) = 0;
  40     GPIOA_PIN(5) = (1<<5);
  41 }
  42
  43 void lcd_write_command(int byte)
  44 {
  45     while(SSP_SR & (1<<4))  /* BSY flag */
  46         ;
  47
  48     GPIOB_PIN(2) = 0;
  49     SSP_DATA = byte;
  50
  51     while(SSP_SR & (1<<4))  /* BSY flag */
  52         ;
  53 }
  54
  55 void lcd_write_data(const fb_data* p_bytes, int count)
  56 {
  57     GPIOB_PIN(2) = (1<<2);
  58
  59     while (count--)
  60     {
  61         while(!(SSP_SR & (1<<1)))   /* wait until transmit FIFO is not full */
  62             ;
  63
  64         SSP_DATA = *p_bytes++;
  65     }
  66 }