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path: root/utils/zenutils/source/shared/utils.cpp

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author	Rafaël Carré <rafael.carre@gmail.com>	2010-01-24 15:04:21 +0000
committer	Rafaël Carré <rafael.carre@gmail.com>	2010-01-24 15:04:21 +0000
commit	b2323be33b5a89cc244d4488b21263a359aced96 (patch)
tree	112b2df776d9e4ca404237c176f56433a4136471 /utils/zenutils/source/shared/utils.cpp
parent	fd13e09c4f79f9a26c76c160b007513cacc8b818 (diff)
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ARM: lr addresses the next instruction after the failing one in undefined instruction vector

Substract 4 before passing the argument to UIE so the correct address is displayed git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24321 a1c6a512-1295-4272-9138-f99709370657

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/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 *
 * Copyright (C) 2003-2005 J�rg Hohensohn
 *
 * Alpine CD changer Project
 * This is a feasibility study for Archos emulating an Alpine M-Bus CD changer.
 * 
 * Currently it will do seeks and change tracks, but nothing like disks.
 * The debug version shows a dump of the M-Bus communication on screen.
 *
 * Usage: Start plugin, it will stay in the background and do the emulation.
 * You need to make an adapter with an 8-pin DIN plug for the radio at one end
 * and a 4-ring 3.5 mm plug for the Archos headphone jack at the other.
 * The Archos remote pin connects to the M-Bus, audio as usual.
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include "plugin.h"

/* Only build for (correct) target */
#if CONFIG_CPU==SH7034 && !defined(HAVE_MMC)

PLUGIN_HEADER

#ifdef HAVE_LCD_CHARCELLS /* player model */
#define LINES    2
#define COLUMNS 11
#else /* recorder models */
#define LINES    8
#define COLUMNS 32 /* can't really tell for proportional font */
#endif

/****************** imports ******************/

#include "sh7034.h"
#include "system.h"

/****************** constants ******************/

/* measured bit time on the M-Bus is 3.075 ms = 325.2 Hz */
#define MBUS_BAUDRATE 3252 /* make it 10 * bittime */
#define MBUS_STEP_FREQ (MBUS_BAUDRATE/2) /* 5 steps per bit */
#define MBUS_BIT_FREQ (MBUS_BAUDRATE/10) /* the true bit frequency again */

#define MBUS_MAX_SIZE      16 /* maximum length of an M-Bus packet, incl. checksum */
#define MBUS_RCV_QUEUESIZE  4 /* how many packets can be queued by receiver */

#define ERI1  (*((volatile unsigned long*)0x090001A0)) /* RX error */
#define RXI1  (*((volatile unsigned long*)0x090001A4)) /* RX */

#define PB10 0x0400

/* receive status */
#define RX_BUSY      0 /* reception in progress */
#define RX_RECEIVED  1 /* valid data available */
#define RX_FRAMING   2 /* frame error */
#define RX_OVERRUN   3 /* receiver overrun */
#define RX_PARITY    4 /* parity error */
#define RX_SYMBOL    5 /* invalid bit timing */
#define RX_OVERFLOW  6 /* buffer full */
#define RX_OVERLAP   7 /* receive interrupt while transmitting */

/* timer operation mode */
#define TM_OFF        0 /* not in use */
#define TM_TRANSMIT   1 /* periodic timer to transmit */
#define TM_RX_TIMEOUT 2 /* single shot for receive timeout */

/* emulation play state */
#define EMU_IDLE      0
#define EMU_PREPARING 1
#define EMU_STOPPED   2
#define EMU_PAUSED    3
#define EMU_PLAYING   4
#define EMU_SPINUP    5
#define EMU_FF        6
#define EMU_FR        7


/****************** prototypes ******************/

void timer_init(unsigned hz, unsigned to); /* setup static timer registers and values */
void timer_set_mode(int mode); /* define for what the timer should be used right now */
void timer4_isr(void); /* IMIA4 ISR */

void transmit_isr(void); /* 2nd level ISR for M-Bus transmission */

void uart_init(unsigned baudrate); /* UART setup */
void uart_rx_isr(void) __attribute__((interrupt_handler)); /* RXI1 ISR */
void uart_err_isr(void) __attribute__((interrupt_handler)); /* ERI1 ISR */
void receive_timeout_isr(void); /* 2nd level ISR for receiver timeout */

void mbus_init(void); /* prepare the M-Bus layer */
int mbus_send(unsigned char* p_msg, int digits); /* packet send */
int mbus_receive(unsigned char* p_msg, unsigned bufsize, int timeout); /* packet receive */

unsigned char calc_checksum(unsigned char* p_msg, int digits); /* make M-Bus checksum */
bool bit_test(unsigned char* buf, unsigned bit); /* test one bit of M-Bus packet */
void bit_set(unsigned char* buf, unsigned bit, bool val); /* set/clear one bit of M-Bus packet */

void print_scroll(char* string); /* implements a scrolling screen */
void dump_packet(char* dest, int dst_size, char* src, int n); /* convert packet to ASCII */

void emu_init(void); /* init changer emulation */
void emu_process_packet(unsigned char* mbus_msg, int msg_size); /* feed a received radio packet */
void emu_tick(void); /* for regular actions of the emulator */

int get_playtime(void); /* return the current track time in seconds */
int get_tracklength(void); /* return the total length of the current track */
void set_track(int selected);
int get_track(void); /* return the track number */
void set_play(void); /* start or resume playback */
void set_pause(void); /* pause playback */
void set_stop(void); /* stop playback */
void set_position(int seconds); /* seek */
void get_playmsg(void); /* update the play message with Rockbox info */
void get_diskmsg(void); /* update the disk status message with Rockbox info */

void sound_neutral(void); /* set to everything flat and 0 dB volume */
void sound_normal(void); /* return to user settings */

void thread(void); /* the thread running it all */
int main(void* parameter); /* main loop */
enum plugin_status plugin_start(struct plugin_api* api, void* parameter); /* entry */


/****************** data types ******************/

/* one entry in the receive queue */
typedef struct
{
    unsigned char buf[MBUS_MAX_SIZE]; /* message buffer */
    unsigned size; /* length of data in the buffer */
    unsigned error; /* error code from reception */
} t_rcv_queue_entry;


/****************** globals ******************/


/* information owned by the timer transmit ISR */
struct 
{
    unsigned char send_buf[MBUS_MAX_SIZE]; /* M-Bus message */
    unsigned send_size; /* current length of data in the buffer */
    unsigned index; /* index for which byte to send */
    unsigned byte; /* which byte to send */
    unsigned bitmask; /* which bit to send */
    unsigned step; /* where in the pulse are we */
    bool bit; /* currently sent bit */
    bool collision; /* set if a collision happened */
    bool busy; /* flag if in transmission */
} gSendIRQ;


/* information owned by the UART receive ISR */
struct 
{
    t_rcv_queue_entry queue[MBUS_RCV_QUEUESIZE]; /* M-Bus message queue */
    unsigned buf_read; /* readout maintained by the user application */
    unsigned buf_write; /* writing maintained by ISR */
    bool overflow; /* indicate queue overflow */
    unsigned byte; /* currently assembled byte */
    unsigned bit; /* which bit to receive */
} gRcvIRQ;


/* information owned by the timer */
struct
{
    unsigned mode; /* off, transmit, receive timout */
    unsigned transmit; /* value for transmit */
    unsigned timeout; /* value for receive timeout */
} gTimer;


/* information owned by the changer emulation */
struct
{
    unsigned char playmsg[15]; /* current play state msg */
    unsigned char changemsg[11]; /* changing message */
    unsigned char diskmsg[12]; /* disk status message */
    long poll_interval; /* call the emu each n ticks */
    int time; /* seconds within the song */
    int set_state; /* the desired state to change into */
} gEmu;


/* communication to the worker thread */
struct 
{
    bool foreground; /* set as long as we're owning the UI */
    bool exiting; /* signal to the thread that we want to exit */
    bool ended; /* response from the thread, that is has exited */
} gTread;

static struct plugin_api* rb; /* here is the global API struct pointer */


/****************** implementation ******************/


/* setup static timer registers and values */
void timer_init(unsigned hz, unsigned to)
{
    rb->memset(&gTimer, 0, sizeof(gTimer));
    
    gTimer.transmit = TIMER_FREQ / hz; /* time for bit transitions */
    gTimer.timeout = TIMER_FREQ / to; /* time for receive timeout */
}


/* define for what the timer should be used right now */
void timer_set_mode(int mode)
{
    TCNT4 = 0; /* start counting at 0 */
    gTimer.mode = mode; /* store the mode */

    if (mode == TM_RX_TIMEOUT)
    {
        rb->timer_register(1, NULL, gTimer.timeout, 11, timer4_isr);
    }
    else if (mode == TM_TRANSMIT)
    {
        rb->timer_register(1, NULL, gTimer.transmit, 14, timer4_isr);
    }
    else
    {
        rb->timer_unregister();
    }
}


void timer4_isr(void) /* IMIA4 */
{
    switch (gTimer.mode)
    {   /* distribute the interrupt */
    case TM_TRANSMIT:
        transmit_isr();
        break;
    case TM_RX_TIMEOUT:
        receive_timeout_isr();
        rb->timer_unregister(); /* single shot */
        break;
    default:
        timer_set_mode(TM_OFF); /* spurious interrupt */
    } /* switch */
}


/* About Alpine M-Bus
 * ------------------
 *
 * The protocol uses a single wire in half duplex mode.
 * A bit like I2C, this wire is either pulled low or left floating high.
 * Bit time is ~3 ms, a "zero" is coded as ~0.6 ms low, a "one" as ~1.8 ms low.
 * Nice to view in a 0.6 ms grid:
 *
 *    0   0.6  1.2  1.8  2.4  3.0
 *    |    |    |    |    |    |
 *  __      ___________________
 *    \____/                   \    "zero" bit
 *  __                _________
 *    \______________/         \    "one" bit
 *
 * So I send out the data in a timer interrupt spawned to 0.6 ms.
 * In phases where the line is floating high, I can check for collisions.
 * (happens if the other side driving it low, too.)
 *
 * Data is transmitted in multiples of 4 bit, to ease BCD representation.
 */


/* 2nd level ISR for M-Bus transmission */
void transmit_isr(void)
{
    bool exit = false;

    TSR4 &= ~0x01; /* clear the interrupt */

    switch(gSendIRQ.step++)
    {
    case 0:
        and_b(~0x04, &PBDRH); /* low (read-modify-write access may have changed it while it was input) */
        or_b(0x04, &PBIORH); /* drive low (output) */
        break;
    case 1: /* 0.6 ms */
        if (!gSendIRQ.bit) /* sending "zero"? */
            and_b(~0x04, &PBIORH); /* float (input) */


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