From 2f9bf25175b9b1701b8af4133ed660263b034a05 Mon Sep 17 00:00:00 2001 From: Jörg Hohensohn Date: Thu, 20 Jan 2005 21:06:44 +0000 Subject: finally add my Alpine car CD changer emulator, although very few people may use it git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5618 a1c6a512-1295-4272-9138-f99709370657 --- apps/plugins/alpine_cdc.c | 1199 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1199 insertions(+) create mode 100644 apps/plugins/alpine_cdc.c (limited to 'apps/plugins/alpine_cdc.c') diff --git a/apps/plugins/alpine_cdc.c b/apps/plugins/alpine_cdc.c new file mode 100644 index 0000000000..16ebf3950f --- /dev/null +++ b/apps/plugins/alpine_cdc.c @@ -0,0 +1,1199 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * + * Copyright (C) 2003 Jörg Hohensohn + * + * Alpine CD changer Project + * This is a feasibility study for Archos emulating an Alpine M-Bus CD changer. + * + * Currently realized as a plugin, which can't control the mp3 playback. + * It "just" follows all radio commands and answers accordingly. + * 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. + * + ****************************************************************************/ + +/* Only build for (correct) target */ +#if !defined(SIMULATOR) && CONFIG_CPU==SH7034 && !defined(HAVE_MMC) + +#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 "plugin.h" +#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 +{ + int id; /* ID of the thread */ + 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 = FREQ / hz; /* time for bit transitions */ + gTimer.timeout = 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->plugin_register_timer(gTimer.timeout, 11, timer4_isr); + } + else if (mode == TM_TRANSMIT) + { + rb->plugin_register_timer(gTimer.transmit, 14, timer4_isr); + } + else + { + rb->plugin_unregister_timer(); + } +} + + +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->plugin_unregister_timer(); /* 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) */ + break; + case 2: /* 1.2 ms */ + if (!gSendIRQ.bit && ((PBDR & PB10) == 0)) + gSendIRQ.collision = true; + break; + case 3: /* 1.8 ms */ + if (gSendIRQ.bit) /* sending "one"? */ + and_b(~0x04, &PBIORH); /* float (input) */ + else if ((PBDR & PB10) == 0) + gSendIRQ.collision = true; + break; + case 4: /* 2.4 ms */ + if ((PBDR & PB10) == 0) + gSendIRQ.collision = true; + + /* prepare next round */ + gSendIRQ.step = 0; + gSendIRQ.bitmask >>= 1; + if (gSendIRQ.bitmask) + { /* new bit */ + gSendIRQ.bit = (gSendIRQ.byte & gSendIRQ.bitmask) != 0; + } + else + { /* new byte */ + if (++gSendIRQ.index < gSendIRQ.send_size) + { + gSendIRQ.bitmask = 0x08; + gSendIRQ.byte = gSendIRQ.send_buf[gSendIRQ.index]; + gSendIRQ.bit = (gSendIRQ.byte & gSendIRQ.bitmask) != 0; + } + else + exit = true; /* done */ + } + break; + } + + if (exit || gSendIRQ.collision) + { /* stop transmission */ + or_b(0x20, PBCR1_ADDR+1); /* RxD1 again for PB10 */ + timer_set_mode(TM_OFF); /* stop the timer */ + gSendIRQ.busy = false; /* do this last, to avoid race conditions */ + } +} + + +/* For receiving, I use the "normal" serial RX feature of the CPU, + * so we can receive within an interrupt, no line polling necessary. + * Luckily, the M-Bus bit always starts with a falling edge and ends with a high, + * this matches with the start bit and the stop bit of a serial transmission. + * The baudrate is set such that the M-Bus bit time (ca. 3ms) matches + * the serial reception time of one byte, so we receive one byte per + * M-Bus bit. + * Start bit, 8 data bits and stop bit (total=10) nicely fall into the 5 + * phases like above: + * + * 0 0.6 1.2 1.8 2.4 3.0 ms + * | | | | | | time + * __ _______________________________ + * \_______/ \ "zero" bit + * __ _______________ + * \_______________________/ \ "one" bit + * + * | | | | | | | | | | | serial sampling interval + * Start 0 1 2 3 4 5 6 7 Stop bit (LSB first!) + * + * By looking at the bit pattern in the serial byte we can distinguish + * the short low from the longer low, tell "zero" and "one" apart. + * So we receive 0xFE for a "zero", 0xE0 for a "one". + * It may be necessary to treat the bits next to transitions as don't care, + * in case the timing is not so accurate. + * Bits are always sent "back-to-back", so I detect the packet end by timeout. + */ + + +void uart_init(unsigned baudrate) +{ + RXI1 = (unsigned long)uart_rx_isr; /* install ISR */ + ERI1 = (unsigned long)uart_err_isr; /* install ISR */ + + SCR1 = 0x00; /* disable everything; select async mode with SCK pin as I/O */ + SMR1 = 0x00; /* async, 8N1, NoMultiProc, sysclock/1 */ + BRR1 = ((FREQ/(32*baudrate))-1); + + IPRE = (IPRE & ~0xf000) | 0xc000; /* interrupt on level 12 */ + + rb->sleep(1); /* hardware needs to settle for at least one bit interval */ + + and_b(~(SCI_RDRF | SCI_ORER | SCI_FER | SCI_PER), &SSR1); /* clear any receiver flag */ + or_b(SCI_RE | SCI_RIE , &SCR1); /* enable the receiver with interrupt */ +} + + +void uart_rx_isr(void) /* RXI1 */ +{ + unsigned char data; + t_rcv_queue_entry* p_entry = &gRcvIRQ.queue[gRcvIRQ.buf_write]; /* short cut */ + + data = RDR1; /* get data */ + + and_b(~SCI_RDRF, &SSR1); /* clear data received flag */ + + if (gTimer.mode == TM_TRANSMIT) + p_entry->error = RX_OVERLAP; /* oops, we're also transmitting, stop */ + else + timer_set_mode(TM_RX_TIMEOUT); /* (re)spawn timeout */ + + if (p_entry->error != RX_BUSY) + return; + + if ((data & ~0x00) == 0xFE) /* 01111111 in line order (reverse) */ + { /* "zero" received */ + gRcvIRQ.byte <<= 1; + } + else if ((data & ~0x00) == 0xE0) /* 00000111 in line order (reverse) */ + { /* "one" received */ + gRcvIRQ.byte = gRcvIRQ.byte << 1 | 0x01; + } + else + { /* unrecognized pulse */ + p_entry->error = RX_SYMBOL; + } + + if (p_entry->error == RX_BUSY) + { + if (++gRcvIRQ.bit >= 4) + { /* byte completed */ + if (p_entry->size >= sizeof(p_entry->buf)) + { + p_entry->error = RX_OVERFLOW; /* buffer full */ + } + else + { + p_entry->buf[p_entry->size] = gRcvIRQ.byte; + gRcvIRQ.byte = 0; + gRcvIRQ.bit = 0; + p_entry->size++; + } + } + } +} + + +void uart_err_isr(void) /* ERI1 */ +{ + t_rcv_queue_entry* p_entry = &gRcvIRQ.queue[gRcvIRQ.buf_write]; /* short cut */ + + if (p_entry->error == RX_BUSY) + { /* terminate reception in case of error */ + if (SSR1 & SCI_FER) + p_entry->error = RX_FRAMING; + else if (SSR1 & SCI_ORER) + p_entry->error = RX_OVERRUN; + else if (SSR1 & SCI_PER) + p_entry->error = RX_PARITY; + } + + /* clear any receiver flag */ + and_b(~(SCI_RDRF | SCI_ORER | SCI_FER | SCI_PER), &SSR1); +} + + +/* 2nd level ISR for receiver timeout, this finalizes reception */ +void receive_timeout_isr(void) +{ + t_rcv_queue_entry* p_entry = &gRcvIRQ.queue[gRcvIRQ.buf_write]; /* short cut */ + + timer_set_mode(TM_OFF); /* single shot */ + + if (p_entry->error == RX_BUSY) /* everthing OK so far? */ + p_entry->error = RX_RECEIVED; /* end with valid data */ + + /* move to next queue entry */ + gRcvIRQ.buf_write++; + if (gRcvIRQ.buf_write >= MBUS_RCV_QUEUESIZE) + gRcvIRQ.buf_write = 0; + p_entry = &gRcvIRQ.queue[gRcvIRQ.buf_write]; + + if (gRcvIRQ.buf_write == gRcvIRQ.buf_read) + { /* queue overflow */ + gRcvIRQ.overflow = true; + /* what can I do? Continueing overwrites the oldest. */ + } + + gRcvIRQ.byte = 0; + gRcvIRQ.bit = 0; + p_entry->size = 0; + p_entry->error = RX_BUSY; /* enable receive on new entry */ +} + + +/* generate the checksum */ +unsigned char calc_checksum(unsigned char* p_msg, int digits) +{ + int chk = 0; + int i; + + for (i=0; imemset(&gSendIRQ, 0, sizeof(gSendIRQ)); + timer_init(MBUS_STEP_FREQ, (MBUS_BIT_FREQ*10)/15); /* setup frequency and timeout (1.5 bit) */ + + /* init receiver */ + rb->memset(&gRcvIRQ, 0, sizeof(gRcvIRQ)); + uart_init(MBUS_BAUDRATE); +} + + +/* send out a number of BCD digits (one per byte) with M-Bus protocol */ +int mbus_send(unsigned char* p_msg, int digits) +{ + /* wait for previous transmit/receive to end */ + while(gTimer.mode != TM_OFF) /* wait for "free line" */ + rb->sleep(1); + + /* fill in our part */ + rb->memcpy(gSendIRQ.send_buf, p_msg, digits); + + /* add checksum */ + gSendIRQ.send_buf[digits] = calc_checksum(p_msg, digits); + digits++; + + /* debug dump, to be removed */ + if (gTread.foreground) + { + char buf[MBUS_MAX_SIZE+1]; + dump_packet(buf, sizeof(buf), gSendIRQ.send_buf, digits); + /*print_scroll(buf); */ + } + + gSendIRQ.send_size = digits; + + /* prepare everything so the ISR can start right away */ + gSendIRQ.index = 0; + gSendIRQ.byte = gSendIRQ.send_buf[0]; + gSendIRQ.bitmask = 0x08; + gSendIRQ.step = 0; + gSendIRQ.bit = (gSendIRQ.byte & gSendIRQ.bitmask) != 0; + gSendIRQ.collision = false; + gSendIRQ.busy = true; + + /* last chance to wait for a new detected receive to end */ + while(gTimer.mode != TM_OFF) /* wait for "free line" */ + rb->sleep(1); + + and_b(~0x30, PBCR1_ADDR+1); /* GPIO for PB10 */ + timer_set_mode(TM_TRANSMIT); /* run */ + + /* make the call blocking until sent out */ + rb->sleep(digits*4*HZ/MBUS_BIT_FREQ); /* should take this long */ + + while(gSendIRQ.busy) /* poll in case it lasts longer */ + rb->sleep(1); /* (should not happen) */ + + /* debug output, to be removed */ + if (gTread.foreground) + { + if (gSendIRQ.collision) + print_scroll("collision"); + } + + return gSendIRQ.collision; +} + + +/* returns the size of message copy, 0 if timed out, negative on error */ +int mbus_receive(unsigned char* p_msg, unsigned bufsize, int timeout) +{ + int retval = 0; + + do + { + if (gRcvIRQ.buf_read != gRcvIRQ.buf_write) + { /* something in the queue */ + t_rcv_queue_entry* p_entry = &gRcvIRQ.queue[gRcvIRQ.buf_read]; /* short cut */ + + if (p_entry->error == RX_RECEIVED) + { /* seems valid */ + rb->memcpy(p_msg, p_entry->buf, MIN(p_entry->size, bufsize)); + retval = p_entry->size; /* return message size */ + } + else + { /* an error occured */ + retval = - p_entry->error; /* return negative number */ + } + + /* next queue readout position */ + gRcvIRQ.buf_read++; + if (gRcvIRQ.buf_read >= MBUS_RCV_QUEUESIZE) + gRcvIRQ.buf_read = 0; + + return retval; /* exit */ + } + + if (timeout != 0 || gTimer.mode != TM_OFF) /* also carry on if reception in progress */ + { + if (timeout != -1 && timeout != 0) /* if not infinite or expired */ + timeout--; + + rb->sleep(1); /* wait a while */ + } + + } while (timeout != 0 || gTimer.mode != TM_OFF); + + return 0; /* timeout */ +} + + +/****************** MMI helper fuctions ******************/ + + +void print_scroll(char* string) +{ + static char screen[LINES][COLUMNS+1]; /* visible strings */ + static unsigned pos = 0; /* next print position */ + static unsigned screentop = 0; /* for scrolling */ + + if (!gTread.foreground) + return; /* just to protect careless callers */ + + if (pos >= LINES) + { /* need to scroll first */ + int i; + rb->lcd_clear_display(); + screentop++; + for (i=0; ilcd_puts(0, i, screen[(i+screentop) % LINES]); + + pos = LINES-1; + } + + /* no strncpy avail. */ + rb->snprintf(screen[(pos+screentop) % LINES], sizeof(screen[0]), "%s", string); + + rb->lcd_puts(0, pos, screen[(pos+screentop) % LINES]); +#ifndef HAVE_LCD_CHARCELLS + rb->lcd_update(); +#endif + pos++; +} + + +void dump_packet(char* dest, int dst_size, char* src, int n) +{ + int i; + int len = MIN(dst_size-1, n); + + for (i=0; imemset(&gEmu, 0, sizeof(gEmu)); + + gEmu.poll_interval = HZ; + + /* init the play message to 990000000000000 */ + gEmu.playmsg[0] = gEmu.playmsg[1] = 0x9; + + /* init the changing message to 9B900000001 */ + gEmu.changemsg[0] = gEmu.changemsg[2] = 0x9; + gEmu.changemsg[1] = 0xB; + gEmu.changemsg[10] = 0x1; + + /* init the disk status message to 9C1019999990 */ + rb->memset(&gEmu.diskmsg, 0x9, sizeof(gEmu.diskmsg)); + gEmu.diskmsg[1] = 0xC; + gEmu.diskmsg[2] = gEmu.diskmsg[4] = 0x1; + gEmu.diskmsg[3] = gEmu.diskmsg[11] = 0x0; +} + +/* feed a radio command into the emulator */ +void emu_process_packet(unsigned char* mbus_msg, int msg_size) +{ + bool playmsg_dirty = false; + bool diskmsg_dirty = false; + + if (msg_size == 2 && mbus_msg[0] == 1 && mbus_msg[1] == 8) + { /* 18: ping */ + mbus_send("\x09\x08", 2); /* 98: ping OK */ + } + else if (msg_size == 5 && mbus_msg[0] == 1 && mbus_msg[1] == 1 && mbus_msg[2] == 1) + { /* set play state */ + if (bit_test(mbus_msg, 16)) + { + if (gEmu.set_state == EMU_FF || gEmu.set_state == EMU_FR) /* was seeking? */ + { /* seek to final position */ + set_position(gEmu.time); + } + else if (gEmu.set_state != EMU_PLAYING || gEmu.set_state != EMU_PAUSED) + { /* was not playing yet, better send disk message */ + diskmsg_dirty = true; + } + set_play(); + gEmu.set_state = EMU_PLAYING; + playmsg_dirty = true; + } + + if (bit_test(mbus_msg, 17)) + { + gEmu.set_state = EMU_PAUSED; + playmsg_dirty = true; + set_pause(); + } + + if (bit_test(mbus_msg, 14)) + { + gEmu.set_state = EMU_STOPPED; + playmsg_dirty = true; + set_stop(); + } + + if (bit_test(mbus_msg, 18)) + { + gEmu.set_state = EMU_FF; + playmsg_dirty = true; + set_pause(); + } + + if (bit_test(mbus_msg, 19)) + { + gEmu.set_state = EMU_FR; + playmsg_dirty = true; + set_pause(); + } + + if (bit_test(mbus_msg, 12)) /* scan stop */ + { + bit_set(gEmu.playmsg, 51, false); + playmsg_dirty = true; + } + + if (gEmu.set_state == EMU_FF || gEmu.set_state == EMU_FR) + gEmu.poll_interval = HZ/4; /* faster refresh */ + else + gEmu.poll_interval = HZ; + } + else if (msg_size == 8 && mbus_msg[0] == 1 && mbus_msg[1] == 1 && mbus_msg[2] == 4) + { /* set program mode */ + gEmu.playmsg[11] = mbus_msg[3]; /* copy repeat, random, intro */ + gEmu.playmsg[12] = mbus_msg[4]; /* ToDo */ + playmsg_dirty = true; + } + else if (msg_size ==8 && mbus_msg[0] == 1 && mbus_msg[1] == 1 && mbus_msg[2] == 3) + { /* changing */ + gEmu.time = 0; /* reset playtime */ + playmsg_dirty = true; + if (mbus_msg[3] == 0) + { /* changing track */ + if (mbus_msg[4] == 0xA && mbus_msg[5] == 0x3) + { /* next random */ + gEmu.playmsg[3] = rb->rand() % 10; /* ToDo */ + gEmu.playmsg[4] = rb->rand() % 10; + } + else if (mbus_msg[4] == 0xB && mbus_msg[5] == 0x3) + { /* previous random */ + gEmu.playmsg[3] = rb->rand() % 10; /* ToDo */ + gEmu.playmsg[4] = rb->rand() % 10; + } + else + { /* normal track select */ + set_track(mbus_msg[4]*10 + mbus_msg[5]); + } + } + else + { /* changing disk */ + diskmsg_dirty = true; + gEmu.changemsg[3] = mbus_msg[3]; /* copy disk */ + gEmu.diskmsg[2] = mbus_msg[3]; + gEmu.changemsg[7] = gEmu.playmsg[11]; /* copy flags from status */ + gEmu.changemsg[8] = gEmu.playmsg[12]; + /*gEmu.playmsg[3] = 0; */ /* reset to track 1 */ + /*gEmu.playmsg[4] = 1; */ + mbus_send(gEmu.changemsg, sizeof(gEmu.changemsg)); + } + } + else + { /* if in doubt, send Ack */ + mbus_send("\x09\x0F\x00\x00\x00\x00\x00", 7); + } + + if (playmsg_dirty) + { + rb->yield(); /* give the mpeg thread a chance to process */ + get_playmsg(); /* force update */ + mbus_send(gEmu.playmsg, sizeof(gEmu.playmsg)); + } + + if (diskmsg_dirty) + { + get_diskmsg(); /* force update */ + mbus_send(gEmu.diskmsg, sizeof(gEmu.diskmsg)); + } +} + + +/* called each second in case the emulator has something to do */ +void emu_tick(void) +{ + get_playmsg(); /* force update */ + if (bit_test(gEmu.playmsg, 56)) /* play bit */ + { + unsigned remain; /* helper as we walk down the digits */ + + switch(gEmu.set_state) + { + case EMU_FF: + gEmu.time += 10; + case EMU_FR: + gEmu.time -= 5; + + if (gEmu.time < 0) + gEmu.time = 0; + else if (gEmu.time > get_tracklength()) + gEmu.time = get_tracklength(); + + /* convert value to MM:SS */ + remain = (unsigned)gEmu.time; + gEmu.playmsg[7] = remain / (10*60); + remain -= gEmu.playmsg[7] * (10*60); + gEmu.playmsg[8] = remain / 60; + remain -= gEmu.playmsg[8] * 60; + gEmu.playmsg[9] = remain / 10; + remain -= gEmu.playmsg[9] * 10; + gEmu.playmsg[10] = remain; + } + + mbus_send(gEmu.playmsg, sizeof(gEmu.playmsg)); + } +} + + +/****************** communication with Rockbox playback ******************/ + + +/* update the play message with Rockbox info */ +void get_playmsg(void) +{ + int track, time; + + if (gEmu.set_state != EMU_FF && gEmu.set_state != EMU_FR) + { + switch(rb->mpeg_status()) + { + case MPEG_STATUS_PLAY: + print_scroll("MpegStat Play"); + if (gEmu.set_state == EMU_FF || gEmu.set_state == EMU_FR) + gEmu.playmsg[2] = gEmu.set_state; /* set FF/FR */ + else + gEmu.playmsg[2] = EMU_PLAYING; /* set normal play */ + + bit_set(gEmu.playmsg, 56, true); /* set play */ + bit_set(gEmu.playmsg, 57, false); /* clear pause */ + bit_set(gEmu.playmsg, 59, false); /* clear stop */ + break; + + case MPEG_STATUS_PLAY | MPEG_STATUS_PAUSE: + print_scroll("MpegStat Pause"); + gEmu.playmsg[2] = EMU_PAUSED; + bit_set(gEmu.playmsg, 56, false); /* clear play */ + bit_set(gEmu.playmsg, 57, true); /* set pause */ + bit_set(gEmu.playmsg, 59, false); /* clear stop */ + break; + + default: + print_scroll("MpegStat 0"); + gEmu.playmsg[2] = EMU_STOPPED; + bit_set(gEmu.playmsg, 56, false); /* clear play */ + bit_set(gEmu.playmsg, 57, false); /* clear pause */ + bit_set(gEmu.playmsg, 59, true); /* set stop */ + break; + } + + /* convert value to MM:SS */ + time = get_playtime(); + gEmu.time = time; /* copy it */ + gEmu.playmsg[7] = time / (10*60); + time -= gEmu.playmsg[7] * (10*60); + gEmu.playmsg[8] = time / 60; + time -= gEmu.playmsg[8] * 60; + gEmu.playmsg[9] = time / 10; + time -= gEmu.playmsg[9] * 10; + gEmu.playmsg[10] = time; + } + else /* FF/FR */ + { + gEmu.playmsg[2] = gEmu.set_state; /* in FF/FR, report that instead */ + } + + track = get_track(); + gEmu.playmsg[3] = track / 10; + gEmu.playmsg[4] = track % 10; +} + +/* update the disk status message with Rockbox info */ +void get_diskmsg(void) +{ + int tracks = rb->playlist_amount(); + if (tracks > 99) + tracks = 99; + gEmu.diskmsg[5] = tracks / 10; + gEmu.diskmsg[6] = tracks % 10; +} + +/* return the current track time in seconds */ +int get_playtime(void) +{ + struct mp3entry* p_mp3entry; + + p_mp3entry = rb->mpeg_current_track(); + if (p_mp3entry == NULL) + return 0; + + return p_mp3entry->elapsed / 1000; +} + +/* return the total length of the current track */ +int get_tracklength(void) +{ + struct mp3entry* p_mp3entry; + + p_mp3entry = rb->mpeg_current_track(); + if (p_mp3entry == NULL) + return 0; + + return p_mp3entry->length / 1000; +} + +/* change to a new track */ +void set_track(int selected) +{ + if (selected > get_track()) + { + print_scroll("mpeg_next"); + rb->mpeg_next(); + } + else if (selected < get_track()) + { + print_scroll("mpeg_prev"); + rb->mpeg_prev(); + } +} + +/* return the track number */ +int get_track(void) +{ + struct mp3entry* p_mp3entry; + + p_mp3entry = rb->mpeg_current_track(); + if (p_mp3entry == NULL) + return 0; + + return p_mp3entry->index + 1; /* track numbers start with 1 */ +} + +/* start or resume playback */ +void set_play(void) +{ + if (rb->mpeg_status() == MPEG_STATUS_PLAY) + return; + + if (rb->mpeg_status() == (MPEG_STATUS_PLAY | MPEG_STATUS_PAUSE)) + { + print_scroll("mpeg_resume"); + rb->mpeg_resume(); + } + else + { + print_scroll("mpeg_play(0)"); + rb->mpeg_play(0); + } +} + +/* pause playback */ +void set_pause(void) +{ + if (rb->mpeg_status() == MPEG_STATUS_PLAY) + { + print_scroll("mpeg_pause"); + rb->mpeg_pause(); + } +} + +/* stop playback */ +void set_stop(void) +{ + if (rb->mpeg_status() & MPEG_STATUS_PLAY) + { + print_scroll("mpeg_stop"); + rb->mpeg_stop(); + } +} + +/* seek */ +void set_position(int seconds) +{ + if (rb->mpeg_status() & MPEG_STATUS_PLAY) + { + print_scroll("mpeg_ff_rewind"); + rb->mpeg_ff_rewind(seconds * 1000); + } +} + +/****************** main thread + helper ******************/ + +/* set to everything flat and 0 dB volume */ +void sound_neutral(void) +{ /* neutral sound settings */ + rb->mpeg_sound_set(SOUND_BASS, 0); + rb->mpeg_sound_set(SOUND_TREBLE, 0); + rb->mpeg_sound_set(SOUND_BALANCE, 0); + rb->mpeg_sound_set(SOUND_VOLUME, 92); /* 0 dB */ + rb->mpeg_sound_set(SOUND_LOUDNESS, 0); + rb->mpeg_sound_set(SOUND_SUPERBASS, 0); + rb->mpeg_sound_set(SOUND_AVC, 0); +} + +/* return to user settings */ +void sound_normal(void) +{ /* restore sound settings */ + rb->mpeg_sound_set(SOUND_BASS, rb->global_settings->bass); + rb->mpeg_sound_set(SOUND_TREBLE, rb->global_settings->treble); + rb->mpeg_sound_set(SOUND_BALANCE, rb->global_settings->balance); + rb->mpeg_sound_set(SOUND_VOLUME, rb->global_settings->volume); + rb->mpeg_sound_set(SOUND_LOUDNESS, rb->global_settings->loudness); + rb->mpeg_sound_set(SOUND_SUPERBASS, rb->global_settings->superbass); + rb->mpeg_sound_set(SOUND_AVC, rb->global_settings->avc); +} + +/* the thread running it all */ +void thread(void) +{ + int msg_size; + unsigned char mbus_msg[MBUS_MAX_SIZE]; + char buf[32]; + bool connected = false; + long last_tick = *rb->current_tick; /* for 1 sec tick */ + + do + { + msg_size = mbus_receive(mbus_msg, sizeof(mbus_msg), 1); + if (msg_size > 0) + { /* received something */ + if(gTread.foreground) + { + dump_packet(buf, sizeof(buf), mbus_msg, msg_size); + /*print_scroll(buf); */ + } + if (msg_size > 2 && mbus_msg[0] == 1 + && mbus_msg[msg_size-1] == calc_checksum(mbus_msg, msg_size-1)) + { /* sanity and checksum OK */ + if (!connected) + { /* with the first received packet: */ + sound_neutral(); /* set to flat and 0dB volume */ + connected = true; + } + emu_process_packet(mbus_msg, msg_size-1); /* pass without chksum */ + } + else if(gTread.foreground) + { /* not OK */ + print_scroll("bad packet"); + } + } + else if (msg_size < 0 && gTread.foreground) + { /* error */ + rb->snprintf(buf, sizeof(buf), "rcv error %d", msg_size); + print_scroll(buf); + } + + if (*rb->current_tick - last_tick >= gEmu.poll_interval) + { /* call the emulation regulary */ + emu_tick(); + last_tick += gEmu.poll_interval; + } + + } while (!gTread.exiting); + + gTread.ended = true; /* acknowledge the exit */ + rb->remove_thread(gTread.id); /* commit suicide */ + rb->yield(); /* pass control to other threads, we won't return */ +} + +/* callback to end the TSR plugin, called before a new one gets loaded */ +void exit_tsr(void) +{ + gTread.exiting = true; /* tell the thread to end */ + while (!gTread.ended) /* wait until it did */ + rb->yield(); + + uart_init(BAUDRATE); /* return to standard baudrate */ + IPRE = (IPRE & ~0xF000); /* UART interrupt off */ + timer_set_mode(TM_OFF); /* timer interrupt off */ + + sound_normal(); /* restore sound settings */ +} + +/****************** main ******************/ + + +int main(void* parameter) +{ + (void)parameter; + /*int button; */ + int stacksize; + void* stack; + + mbus_init(); /* init the M-Bus layer */ + emu_init(); /* init emulator */ + + rb->splash(HZ/5, true, "Alpine CDC"); /* be quick on autostart */ + +#ifdef DEBUG + print_scroll("Alpine M-Bus Test"); + print_scroll("any key to TSR"); +#endif + + /* init the worker thread */ + stack = rb->plugin_get_buffer(&stacksize); /* use the rest as stack */ + stack = (void*)(((unsigned int)stack + 100) & ~3); /* a bit away, 32 bit align */ + stacksize = (stacksize - 100) & ~3; + if (stacksize < DEFAULT_STACK_SIZE) + { + rb->splash(HZ*2, true, "Out of memory"); + return -1; + } + + rb->memset(&gTread, 0, sizeof(gTread)); + gTread.foreground = true; + gTread.id = rb->create_thread(thread, stack, stacksize, "CDC"); + +#ifdef DEBUG + do + { + button = rb->button_get(true); + } while (button & BUTTON_REL)); +#endif + + gTread.foreground = false; /* we're in the background now */ + rb->plugin_tsr(exit_tsr); /* stay resident */ + +#ifdef DEBUG + return rb->default_event_handler(button); +#else + return 0; +#endif +} + + +/***************** Plugin Entry Point *****************/ + + +enum plugin_status plugin_start(struct plugin_api* api, void* parameter) +{ + /* this macro should be called as the first thing you do in the plugin. + it test that the api version and model the plugin was compiled for + matches the machine it is running on */ + TEST_PLUGIN_API(api); + rb = api; /* copy to global api pointer */ + + /* now go ahead and have fun! */ + return (main(parameter)==0) ? PLUGIN_OK : PLUGIN_ERROR; +} + +#endif /* #ifndef SIMULATOR, etc. */ -- cgit v1.2.3