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1.2.2
by Laszlo Boszormenyi (GCS)
Import upstream version 2.1.dfsg |
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/*
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* midi.c - MIDI (6850 UART) emulation.
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*
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* Written by
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* Hannu Nuotio <hannu.nuotio@tut.fi>
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*
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* Based on code by
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* André Fachat <fachat@physik.tu-chemnitz.de>
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*
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* This file is part of VICE, the Versatile Commodore Emulator.
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* See README for copyright notice.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA.
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*
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*/
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#include "vice.h" |
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#ifdef HAVE_MIDI
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#include <stdio.h> |
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#include "alarm.h" |
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#include "archdep.h" |
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#include "clkguard.h" |
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#include "cmdline.h" |
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#include "interrupt.h" |
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#include "lib.h" |
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#include "log.h" |
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#include "machine.h" |
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#include "maincpu.h" |
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#include "midi.h" |
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#include "mididrv.h" |
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#include "resources.h" |
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#include "translate.h" |
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#include "types.h" |
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#include "util.h" |
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#undef DEBUG
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/******************************************************************/
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/* - Control register */
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/* Receive Interrupt Enable */
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#define MIDI_CTRL_RIE 0x80
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/* Transmit Control */
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#define MIDI_CTRL_TC2 0x40
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#define MIDI_CTRL_TC1 0x20
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#define MIDI_CTRL_TC(x) (((MIDI_CTRL_TC2 | MIDI_CTRL_TC1) & x) >> 5)
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/* Word Select */
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#define MIDI_CTRL_WS3 0x10
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#define MIDI_CTRL_WS2 0x08
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#define MIDI_CTRL_WS1 0x04
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#define MIDI_CTRL_WS(x) (((MIDI_CTRL_WS3 | MIDI_CTRL_WS2 | MIDI_CTRL_WS1) & x) >> 2)
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/* Counter Divide Select */
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#define MIDI_CTRL_CD2 0x02
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#define MIDI_CTRL_CD1 0x01
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#define MIDI_CTRL_CD(x) ((MIDI_CTRL_CD2 | MIDI_CTRL_CD1) & x)
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#define MIDI_CTRL_RESET 0x03
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/* Defaults after reset */
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#define MIDI_CTRL_DEFAULT (MIDI_CTRL_RESET)
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/* - Status register */
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/* Interrupt Request */
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#define MIDI_STATUS_IRQ 0x80
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/* Parity Error */
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#define MIDI_STATUS_PE 0x40
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/* Receiver Overrun */
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#define MIDI_STATUS_OVRN 0x20
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/* Framing Error */
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#define MIDI_STATUS_FE 0x10
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/* Clear to Send */
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#define MIDI_STATUS_CTS 0x08
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/* Data Carrier Detect */
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#define MIDI_STATUS_DCD 0x04
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/* Transmit Data Register Empty */
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#define MIDI_STATUS_TDRE 0x02
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/* Receive Data Register Full */
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#define MIDI_STATUS_RDRF 0x01
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/* Defaults after reset */
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#define MIDI_STATUS_DEFAULT (MIDI_STATUS_TDRE)
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/******************************************************************/
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int midi_enabled = 0; |
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static int fd_in = -1; |
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static int fd_out = -1; |
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static alarm_t *midi_alarm = NULL; |
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static unsigned int midi_int_num; |
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static int midi_ticks = 0; /* number of clock ticks per char */ |
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static int intx = 0; /* indicates that a transmit is currently ongoing */ |
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static int irq = 0; |
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static BYTE ctrl; /* control register */ |
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static BYTE status; /* status register */ |
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static BYTE rxdata; /* data that has been received last */ |
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static BYTE txdata; /* data prepared to send */ |
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static int alarm_active = 0; /* if alarm is set or not */ |
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static log_t midi_log = LOG_ERR; |
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static void int_midi(CLOCK offset, void *data); |
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static BYTE midi_last_read = 0; /* the byte read the last time (for RMW) */ |
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/******************************************************************/
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static CLOCK midi_alarm_clk = 0; |
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static int midi_irq = IK_NONE; |
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static int midi_irq_res; |
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int midi_mode = 0; |
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/******************************************************************/
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static void midi_set_int(int midiirq, unsigned int int_num, int value) |
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{
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if(midiirq == IK_IRQ) { |
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maincpu_set_irq(int_num, value); |
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}
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if(midiirq == IK_NMI) { |
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maincpu_set_nmi(int_num, value); |
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}
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}
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static int midi_set_irq(int new_irq_res, void *param) |
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{
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int new_irq; |
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static const int irq_tab[] = { IK_NONE, IK_IRQ, IK_NMI }; |
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if (new_irq_res < 0 || new_irq_res > 2) { |
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return -1; |
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}
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new_irq = irq_tab[new_irq_res]; |
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if(midi_irq != new_irq) { |
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midi_set_int(midi_irq, midi_int_num, IK_NONE); |
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if(irq) { |
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midi_set_int(new_irq, midi_int_num, new_irq); |
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}
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}
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midi_irq = new_irq; |
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midi_irq_res = new_irq_res; |
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return 0; |
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}
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static int get_midi_ticks(void) |
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{
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return (int)(machine_get_cycles_per_second() / 31250); |
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}
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int midi_set_mode(int new_mode, void *param) |
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{
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if(new_mode < 0 || new_mode > 4) { |
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return -1; |
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}
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if(midi_set_irq(midi_interface[new_mode].irq_type, 0)) { |
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return -1; |
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}
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midi_mode = new_mode; |
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midi_ticks = get_midi_ticks(); |
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return 0; |
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}
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static int set_midi_enabled(int val, void *param) |
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{
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midi_enabled = val; |
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return 0; |
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}
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static const resource_int_t resources_int[] = { |
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{ "MIDIEnable", 0, RES_EVENT_STRICT, (resource_value_t)0, |
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&midi_enabled, set_midi_enabled, NULL }, |
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{ NULL } |
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};
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int midi_resources_init(void) |
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{
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if (resources_register_int(resources_int) < 0) { |
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return -1; |
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}
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return mididrv_resources_init(); |
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}
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void midi_resources_shutdown(void) |
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{
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mididrv_resources_shutdown(); |
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}
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static const cmdline_option_t cmdline_options[] = { |
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{ "-midi", SET_RESOURCE, 0, |
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NULL, NULL, "MIDIEnable", (resource_value_t)1, |
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USE_PARAM_STRING, USE_DESCRIPTION_ID, |
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IDCLS_UNUSED, IDCLS_ENABLE_MIDI_EMU, |
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NULL, NULL }, |
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{ "+midi", SET_RESOURCE, 0, |
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NULL, NULL, "MIDIEnable", (resource_value_t)0, |
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USE_PARAM_STRING, USE_DESCRIPTION_ID, |
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IDCLS_UNUSED, IDCLS_DISABLE_MIDI_EMU, |
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NULL, NULL }, |
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{ NULL } |
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};
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int midi_cmdline_options_init(void) |
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{
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if (cmdline_register_options(cmdline_options) < 0) { |
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return -1; |
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}
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return mididrv_cmdline_options_init(); |
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}
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/******************************************************************/
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static void clk_overflow_callback(CLOCK sub, void *var) |
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{
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if(alarm_active) { |
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midi_alarm_clk -= sub; |
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}
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}
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void midi_init(void) |
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{
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midi_int_num = interrupt_cpu_status_int_new(maincpu_int_status, "MIDI"); |
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midi_alarm = alarm_new(maincpu_alarm_context, "MIDI", int_midi, NULL); |
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clk_guard_add_callback(maincpu_clk_guard, clk_overflow_callback, NULL); |
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if(midi_log == LOG_ERR) { |
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midi_log = log_open("MIDI"); |
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}
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mididrv_init(); |
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midi_reset(); |
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}
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static void midi_suspend(void) |
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{
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#ifdef DEBUG
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log_message(midi_log, "suspend"); |
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#endif
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status = MIDI_STATUS_DEFAULT; |
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intx = 0; |
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if(fd_in >= 0) { |
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mididrv_in_close(); |
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}
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fd_in = -1; |
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if(fd_out >= 0) { |
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mididrv_out_close(); |
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}
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fd_out = -1; |
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alarm_unset(midi_alarm); |
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alarm_active = 0; |
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intx = 0; |
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midi_set_int(midi_irq, midi_int_num, 0); |
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irq = 0; |
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}
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void midi_reset(void) |
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{
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#ifdef DEBUG
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log_message(midi_log, "reset"); |
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#endif
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ctrl = MIDI_CTRL_DEFAULT; |
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midi_ticks = get_midi_ticks(); |
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midi_suspend(); |
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}
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static void midi_activate(void) |
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{
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#ifdef DEBUG
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log_message(midi_log, "activate"); |
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#endif
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fd_in = mididrv_in_open(); |
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fd_out = mididrv_out_open(); |
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if(!intx) { |
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midi_alarm_clk = maincpu_clk + 1; |
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alarm_set(midi_alarm, midi_alarm_clk); |
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alarm_active = 1; |
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}
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}
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void REGPARM2 midi_store(WORD a, BYTE b) |
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{
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#ifdef DEBUG
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log_message(midi_log, "store(%x,%02x)", a, b); |
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#endif
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if(maincpu_rmw_flag) { |
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maincpu_clk--; |
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maincpu_rmw_flag = 0; |
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midi_store(a, midi_last_read); |
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maincpu_clk++; |
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}
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a &= midi_interface[midi_mode].mask; |
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if(a == midi_interface[midi_mode].ctrl_addr) { |
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#ifdef DEBUG
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log_message(midi_log, "store ctrl: %02x", b); |
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#endif
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ctrl = b; |
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midi_ticks = get_midi_ticks(); |
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if(MIDI_CTRL_CD(ctrl) == midi_interface[midi_mode].midi_cd) { |
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/* TODO check WS */
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midi_activate(); |
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} else if(MIDI_CTRL_CD(ctrl) == MIDI_CTRL_RESET) { |
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midi_reset(); |
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} else { |
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midi_suspend(); |
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}
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} else if(a == midi_interface[midi_mode].tx_addr) { |
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status &= ~MIDI_STATUS_IRQ; |
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#ifdef DEBUG
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log_message(midi_log, "store tx: %02x", b); |
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#endif
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if((status & MIDI_STATUS_TDRE) && !(MIDI_CTRL_CD(ctrl) == MIDI_CTRL_RESET)) { |
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status &= ~MIDI_STATUS_TDRE; |
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txdata = b; |
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if(!intx) { |
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midi_alarm_clk = maincpu_clk + 1; |
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alarm_set(midi_alarm, midi_alarm_clk); |
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alarm_active = 1; |
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intx = 2; |
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} else { |
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if(intx == 1) { |
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intx++; |
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}
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}
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}
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}
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}
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BYTE REGPARM1 midi_read(WORD a) |
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{
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#ifdef DEBUG
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log_message(midi_log, "read(%x)", a); |
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#endif
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midi_last_read = 0xff; |
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a &= midi_interface[midi_mode].mask; |
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if(a == midi_interface[midi_mode].status_addr) { |
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#ifdef DEBUG
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log_message(midi_log, "read status: %02x", status); |
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#endif
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midi_last_read = status; |
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} else if(a == midi_interface[midi_mode].rx_addr) { |
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#ifdef DEBUG
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log_message(midi_log, "read rx: %02x (%02x)", rxdata, status); |
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#endif
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status &= ~MIDI_STATUS_OVRN; |
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if(irq) { |
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status &= ~MIDI_STATUS_IRQ; |
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midi_set_int(midi_irq, midi_int_num, 0); |
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irq = 0; |
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}
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if(status & MIDI_STATUS_RDRF) { |
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status &= ~MIDI_STATUS_RDRF; |
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midi_last_read = rxdata; |
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}
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}
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return midi_last_read; |
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}
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int REGPARM1 midi_test_read(WORD a) |
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{
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a &= midi_interface[midi_mode].mask; |
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return ((a == midi_interface[midi_mode].status_addr) |
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||(a == midi_interface[midi_mode].rx_addr)); |
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}
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static void int_midi(CLOCK offset, void *data) |
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{
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int rxirq = 0; |
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#if 0 /*def DEBUG */ |
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log_message(midi_log, "int_midi(offset=%ld, clk=%d", (long int)offset, (int)maincpu_clk);
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#endif
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if((intx == 2) && (fd_out >= 0)) { |
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mididrv_out(txdata); |
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}
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if(intx) { |
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intx--; |
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}
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if((fd_in >= 0) && (!(status & MIDI_STATUS_RDRF)) && (mididrv_in(&rxdata) == 1)) { |
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status |= MIDI_STATUS_RDRF; |
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rxirq = 1; |
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#ifdef DEBUG
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log_message(midi_log, "int got %02x", rxdata); |
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#endif
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}
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if(rxirq && (ctrl & MIDI_CTRL_RIE)) { |
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midi_set_int(midi_irq, midi_int_num, 1); |
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status |= MIDI_STATUS_IRQ; |
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irq = 1; |
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#ifdef DEBUG
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log_message(midi_log, "int_midi IRQ offset=%ld, clk=%d", (long int)offset, (int)maincpu_clk); |
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#endif
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}
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if(status & MIDI_STATUS_TDRE) { |
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status |= MIDI_STATUS_TDRE; |
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/* TODO: TX IRQ */
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}
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midi_alarm_clk = maincpu_clk + midi_ticks; |
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alarm_set(midi_alarm, midi_alarm_clk); |
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alarm_active = 1; |
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}
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#endif
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