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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Alan Korr & Nick Robinson
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "button.h"
#include "config.h"
#include "cpu.h"
#include "system.h"
#include "kernel.h"
#include "lcd.h"
#include "serial.h"
#include "iap.h"
#if defined(IPOD_ACCESSORY_PROTOCOL)
static int autobaud = 0;
volatile unsigned long * base_RBR, * base_THR, * base_LCR, * base_LSR, * base_DLL;
static void set_bitrate(unsigned int rate)
{
unsigned int divisor;
divisor = 24000000L / rate / 16;
*base_LCR = 0x80; /* Divisor latch enable */
*base_DLL = (divisor >> 0) & 0xFF;
*base_LCR = 0x03; /* Divisor latch disable, 8-N-1 */
}
void serial_setup (void)
{
int tmp;
#if defined(IPOD_COLOR) || defined(IPOD_4G) || defined(IPOD_MINI) || defined(IPOD_MINI2G)
/* Route the Tx/Rx pins. 4G Ipod, MINI & MINI2G ser1, dock connector */
GPIO_CLEAR_BITWISE(GPIOD_ENABLE, 0x6);
GPIO_CLEAR_BITWISE(GPIOD_OUTPUT_EN, 0x6);
outl(0x70000018, inl(0x70000018) & ~0xc00);
base_RBR = &SER1_RBR;
base_THR = &SER1_THR;
base_LCR = &SER1_LCR;
base_LSR = &SER1_LSR;
base_DLL = &SER1_DLL;
DEV_EN |= DEV_SER1;
CPU_HI_INT_DIS = SER1_MASK;
DEV_RS |= DEV_SER1;
sleep(1);
DEV_RS &= ~DEV_SER1;
SER1_LCR = 0x80; /* Divisor latch enable */
SER1_DLM = 0x00;
SER1_LCR = 0x03; /* Divisor latch disable, 8-N-1 */
SER1_IER = 0x01;
SER1_FCR = 0x07; /* Tx+Rx FIFO reset and FIFO enable */
CPU_INT_EN = HI_MASK;
CPU_HI_INT_EN = SER1_MASK;
tmp = SER1_RBR;
#elif defined(IPOD_NANO) || defined(IPOD_VIDEO)
/* Route the Tx/Rx pins. 5G Ipod */
(*(volatile unsigned long *)(0x7000008C)) &= ~0x0C;
GPO32_ENABLE &= ~0x0C;
base_RBR = &SER0_RBR;
base_THR = &SER0_THR;
base_LCR = &SER0_LCR;
base_LSR = &SER0_LSR;
base_DLL = &SER0_DLL;
DEV_EN = DEV_EN | DEV_SER0;
CPU_HI_INT_DIS = SER0_MASK;
DEV_RS |= DEV_SER0;
sleep(1);
DEV_RS &= ~DEV_SER0;
SER0_LCR = 0x80; /* Divisor latch enable */
SER0_DLM = 0x00;
SER0_LCR = 0x03; /* Divisor latch disable, 8-N-1 */
SER0_IER = 0x01;
SER0_FCR = 0x07; /* Tx+Rx FIFO reset and FIFO enable */
CPU_INT_EN = HI_MASK;
CPU_HI_INT_EN = SER0_MASK;
tmp = SER0_RBR;
#else
/* Default Route the Tx/Rx pins. 4G Ipod, ser0, top connector */
GPIO_CLEAR_BITWISE(GPIOC_INT_EN, 0x8);
GPIO_CLEAR_BITWISE(GPIOC_INT_LEV, 0x8);
GPIOC_INT_CLR = 0x8;
base_RBR = &SER0_RBR;
base_THR = &SER0_THR;
base_LCR = &SER0_LCR;
base_LSR = &SER0_LSR;
base_DLL = &SER0_DLL;
DEV_EN |= DEV_SER0;
CPU_HI_INT_DIS = SER0_MASK;
DEV_RS |= DEV_SER0;
sleep(1);
DEV_RS &= ~DEV_SER0;
SER0_LCR = 0x80; /* Divisor latch enable */
SER0_DLM = 0x00;
SER0_LCR = 0x03; /* Divisor latch disable, 8-N-1 */
SER0_IER = 0x01;
SER0_FCR = 0x07; /* Tx+Rx FIFO reset and FIFO enable */
CPU_INT_EN = HI_MASK;
CPU_HI_INT_EN = SER0_MASK;
tmp = SER0_RBR;
#endif
serial_bitrate(0);
}
void serial_bitrate(int rate)
{
if(rate == 0)
{
autobaud = 2;
set_bitrate(115200);
}
else
{
autobaud = 0;
set_bitrate(rate);
}
}
int tx_rdy(void)
{
if((*base_LSR & 0x20))
return 1;
else
return 0;
}
static int rx_rdy(void)
{
if((*base_LSR & 0x1))
return 1;
else
return 0;
}
void tx_writec(unsigned char c)
{
*base_THR =(int) c;
}
static unsigned char rx_readc(void)
{
return (*base_RBR & 0xFF);
}
void SERIAL_ISR(void)
{
static int badbaud = 0;
static bool newpkt = true;
char temp;
while(rx_rdy())
{
temp = rx_readc();
if (newpkt && autobaud > 0)
{
if (autobaud == 1)
{
switch (temp)
{
case 0xFF:
case 0x55:
break;
case 0xFC:
set_bitrate(19200);
temp = 0xFF;
break;
case 0xE0:
set_bitrate(9600);
temp = 0xFF;
break;
default:
badbaud++;
if (badbaud >= 6) /* Switch baud detection mode */
{
autobaud = 2;
set_bitrate(115200);
badbaud = 0;
} else {
set_bitrate(57600);
}
continue;
}
} else {
switch (temp)
{
case 0xFF:
case 0x55:
break;
case 0xFE:
set_bitrate(57600);
temp = 0xFF;
break;
case 0xFC:
set_bitrate(38400);
temp = 0xFF;
break;
case 0xE0:
set_bitrate(19200);
temp = 0xFF;
break;
default:
badbaud++;
if (badbaud >= 6) /* Switch baud detection */
{
autobaud = 1;
set_bitrate(57600);
badbaud = 0;
} else {
set_bitrate(115200);
}
continue;
}
}
}
bool pkt = iap_getc(temp);
if(newpkt && !pkt)
autobaud = 0; /* Found good baud */
newpkt = pkt;
}
}
#endif
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