125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 Vitja Makarov
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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#include "button.h"
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#include "ata2501.h"
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#define STB (1<<5)
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#define SDATA (1<<4)
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#define RESET (1<<6)
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#define SIFMD (1<<7)
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#define STB_DELAY 200
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#define udelay _udelay
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/* do we really need it? */
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static void _udelay(int cycles)
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{
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cycles /= 8;
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while (cycles--) {
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asm("nop;nop;");
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}
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}
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/*
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TODO: sensitivity using GPIOS
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*/
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void ata2501_init(void)
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{
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GPIOD_DIR |= (RESET | STB | SIFMD | (1 << 8) | (1 << 9));
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GPIOD_DIR &= ~(SDATA);
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GPIOD &= ~RESET;
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udelay(1000);
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GPIOD |= RESET;
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GPIOD &= ~STB;
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#if 1
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GPIOD &= ~((1 << 9) | (1 << 8));
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GPIOD |= ((1 << 8) | SIFMD) | (1 << 9);
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#else
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GPIOD |= ((1 << 9) | (1 << 8));
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GPIOD &= ~(SIFMD);
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#endif
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}
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unsigned short ata2501_read(void)
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{
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unsigned short ret = 0;
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int i;
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for (i = 0; i < 12; i++) {
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GPIOD |= STB;
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udelay(50);
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ret <<= 1;
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if (GPIOD & SDATA)
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ret |= 1;
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udelay(50);
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GPIOD &= ~STB;
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udelay(100);
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}
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return ret;
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}
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//#define ATA2501_TEST
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#ifdef ATA2501_TEST
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#include "lcd.h"
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#include "sprintf.h"
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static
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void bits(char *str, unsigned short val)
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{
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int i;
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for (i = 0; i < 12; i++)
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str[i] = (val & (1 << i)) ? '1' : '0';
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str[i] = 0;
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}
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void ata2501_test(void)
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{
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char buf[100];
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ata2501_init();
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while (1) {
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unsigned short data;
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int line = 0;
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data = ata2501_read();
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lcd_clear_display();
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lcd_puts(0, line++, "ATA2501 test");
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bits(buf, data);
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lcd_puts(0, line++, buf);
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lcd_update();
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udelay(2000);
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}
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}
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#endif
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