New terminal outputs using serial: morse and spkmodem.
This commit is contained in:
Vladimir 'phcoder' Serbinenko
parent
34f71cb866
commit
b78d6c32e3
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@ -1,3 +1,7 @@
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2013-01-16 Vladimir Serbinenko <phcoder@gmail.com>
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New terminal outputs using serial: morse and spkmodem.
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2013-01-16 Vladimir Serbinenko <phcoder@gmail.com>
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Improve bidi handling in entry editor.
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@ -1229,9 +1229,9 @@ Select the terminal input device. You may select multiple devices here,
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separated by spaces.
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Valid terminal input names depend on the platform, but may include
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@samp{console} (PC BIOS and EFI consoles), @samp{serial} (serial terminal),
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@samp{ofconsole} (Open Firmware console), @samp{at_keyboard} (PC AT
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keyboard, mainly useful with Coreboot), or @samp{usb_keyboard} (USB keyboard
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@samp{console} (native platform console), @samp{serial} (serial terminal),
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@samp{serial_<port>} (serial terminal with explicit port selection),
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@samp{at_keyboard} (PC AT keyboard), or @samp{usb_keyboard} (USB keyboard
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using the HID Boot Protocol, for cases where the firmware does not handle
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this).
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@ -1242,9 +1242,21 @@ Select the terminal output device. You may select multiple devices here,
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separated by spaces.
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Valid terminal output names depend on the platform, but may include
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@samp{console} (PC BIOS and EFI consoles), @samp{serial} (serial terminal),
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@samp{gfxterm} (graphics-mode output), @samp{ofconsole} (Open Firmware
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console), or @samp{vga_text} (VGA text output, mainly useful with Coreboot).
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@samp{console} (native platform console), @samp{serial} (serial terminal),
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@samp{serial_<port>} (serial terminal with explicit port selection),
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@samp{gfxterm} (graphics-mode output), @samp{vga_text} (VGA text output),
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@samp{mda_text} (MDA text output), @samp{morse} (Morse-coding using system
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beeper) or @samp{spkmodem} (simple data protocol using system speaker).
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@samp{spkmodem} is useful when no serial port is available. Connect the output
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of sending system (where GRUB is running) to line-in of receiving system
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(usually developper machine).
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On receiving system compile @samp{spkmodem-recv} from
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@samp{util/spkmodem-recv.c} and run:
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@example
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parecord --channels=1 --rate=48000 --format=s16le | ./spkmodem-recv
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@end example
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The default is to use the platform's native terminal output.
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@ -778,6 +778,18 @@ module = {
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enable = x86;
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};
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module = {
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name = spkmodem;
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x86 = term/spkmodem.c;
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enable = x86;
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};
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module = {
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name = morse;
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x86 = term/morse.c;
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enable = x86;
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};
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module = {
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name = probe;
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common = commands/probe.c;
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@ -28,80 +28,12 @@
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#include <grub/command.h>
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#include <grub/i18n.h>
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#include <grub/time.h>
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#include <grub/speaker.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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#define BASE_TEMPO (60 * 1000)
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/* The speaker port. */
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#define SPEAKER 0x61
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/* If 0, follow state of SPEAKER_DATA bit, otherwise enable output
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from timer 2. */
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#define SPEAKER_TMR2 0x01
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/* If SPEAKER_TMR2 is not set, this provides direct input into the
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speaker. Otherwise, this enables or disables the output from the
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timer. */
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#define SPEAKER_DATA 0x02
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/* The PIT channel value ports. You can write to and read from them.
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Do not mess with timer 0 or 1. */
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#define PIT_COUNTER_0 0x40
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#define PIT_COUNTER_1 0x41
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#define PIT_COUNTER_2 0x42
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/* The frequency of the PIT clock. */
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#define PIT_FREQUENCY 0x1234dd
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/* The PIT control port. You can only write to it. Do not mess with
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timer 0 or 1. */
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#define PIT_CTRL 0x43
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#define PIT_CTRL_SELECT_MASK 0xc0
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#define PIT_CTRL_SELECT_0 0x00
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#define PIT_CTRL_SELECT_1 0x40
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#define PIT_CTRL_SELECT_2 0x80
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/* Read and load control. */
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#define PIT_CTRL_READLOAD_MASK 0x30
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#define PIT_CTRL_COUNTER_LATCH 0x00 /* Hold timer value until read. */
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#define PIT_CTRL_READLOAD_LSB 0x10 /* Read/load the LSB. */
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#define PIT_CTRL_READLOAD_MSB 0x20 /* Read/load the MSB. */
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#define PIT_CTRL_READLOAD_WORD 0x30 /* Read/load the LSB then the MSB. */
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/* Mode control. */
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#define PIT_CTRL_MODE_MASK 0x0e
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/* Interrupt on terminal count. Setting the mode sets output to low.
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When counter is set and terminated, output is set to high. */
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#define PIT_CTRL_INTR_ON_TERM 0x00
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/* Programmable one-shot. When loading counter, output is set to
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high. When counter terminated, output is set to low. Can be
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triggered again from that point on by setting the gate pin to
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high. */
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#define PIT_CTRL_PROGR_ONE_SHOT 0x02
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/* Rate generator. Output is low for one period of the counter, and
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high for the other. */
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#define PIT_CTRL_RATE_GEN 0x04
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/* Square wave generator. Output is low for one half of the period,
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and high for the other half. */
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#define PIT_CTRL_SQUAREWAVE_GEN 0x06
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/* Software triggered strobe. Setting the mode sets output to high.
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When counter is set and terminated, output is set to low. */
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#define PIT_CTRL_SOFTSTROBE 0x08
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/* Hardware triggered strobe. Like software triggered strobe, but
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only starts the counter when the gate pin is set to high. */
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#define PIT_CTRL_HARDSTROBE 0x0a
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/* Count mode. */
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#define PIT_CTRL_COUNT_MASK 0x01
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#define PIT_CTRL_COUNT_BINARY 0x00 /* 16-bit binary counter. */
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#define PIT_CTRL_COUNT_BCD 0x01 /* 4-decade BCD counter. */
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#define T_REST ((grub_uint16_t) 0)
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#define T_FINE ((grub_uint16_t) -1)
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@ -112,39 +44,6 @@ struct note
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grub_uint16_t duration;
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};
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static void
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beep_off (void)
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{
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unsigned char status;
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status = grub_inb (SPEAKER);
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grub_outb (status & ~(SPEAKER_TMR2 | SPEAKER_DATA), SPEAKER);
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}
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static void
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beep_on (grub_uint16_t pitch)
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{
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unsigned char status;
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unsigned int counter;
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if (pitch < 20)
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pitch = 20;
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else if (pitch > 20000)
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pitch = 20000;
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counter = PIT_FREQUENCY / pitch;
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/* Program timer 2. */
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grub_outb (PIT_CTRL_SELECT_2 | PIT_CTRL_READLOAD_WORD
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| PIT_CTRL_SQUAREWAVE_GEN | PIT_CTRL_COUNT_BINARY, PIT_CTRL);
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grub_outb (counter & 0xff, PIT_COUNTER_2); /* LSB */
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grub_outb ((counter >> 8) & 0xff, PIT_COUNTER_2); /* MSB */
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/* Start speaker. */
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status = grub_inb (SPEAKER);
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grub_outb (status | SPEAKER_TMR2 | SPEAKER_DATA, SPEAKER);
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}
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/* Returns whether playing should continue. */
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static int
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play (unsigned tempo, struct note *note)
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@ -160,11 +59,11 @@ play (unsigned tempo, struct note *note)
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switch (note->pitch)
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{
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case T_REST:
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beep_off ();
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grub_speaker_beep_off ();
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break;
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default:
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beep_on (note->pitch);
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grub_speaker_beep_on (note->pitch);
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break;
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}
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@ -263,7 +162,7 @@ grub_cmd_play (grub_command_t cmd __attribute__ ((unused)),
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}
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}
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beep_off ();
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grub_speaker_beep_off ();
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return 0;
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}
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@ -20,37 +20,30 @@
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#include <grub/i386/io.h>
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#include <grub/i386/pit.h>
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#define TIMER2_REG_CONTROL 0x42
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#define TIMER_REG_COMMAND 0x43
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#define TIMER2_REG_LATCH 0x61
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#define TIMER2_SELECT 0x80
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#define TIMER_ENABLE_LSB 0x20
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#define TIMER_ENABLE_MSB 0x10
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#define TIMER2_LATCH 0x20
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#define TIMER2_SPEAKER 0x02
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#define TIMER2_GATE 0x01
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void
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grub_pit_wait (grub_uint16_t tics)
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{
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/* Disable timer2 gate and speaker. */
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grub_outb (grub_inb (TIMER2_REG_LATCH) & ~ (TIMER2_SPEAKER | TIMER2_GATE),
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TIMER2_REG_LATCH);
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grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
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& ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
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GRUB_PIT_SPEAKER_PORT);
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/* Set tics. */
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grub_outb (TIMER2_SELECT | TIMER_ENABLE_LSB | TIMER_ENABLE_MSB, TIMER_REG_COMMAND);
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grub_outb (tics & 0xff, TIMER2_REG_CONTROL);
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grub_outb (tics >> 8, TIMER2_REG_CONTROL);
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grub_outb (GRUB_PIT_CTRL_SELECT_2 | GRUB_PIT_CTRL_READLOAD_WORD,
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GRUB_PIT_CTRL);
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grub_outb (tics & 0xff, GRUB_PIT_COUNTER_2);
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grub_outb (tics >> 8, GRUB_PIT_COUNTER_2);
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/* Enable timer2 gate, keep speaker disabled. */
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grub_outb ((grub_inb (TIMER2_REG_LATCH) & ~ TIMER2_SPEAKER) | TIMER2_GATE,
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TIMER2_REG_LATCH);
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grub_outb ((grub_inb (GRUB_PIT_SPEAKER_PORT) & ~ GRUB_PIT_SPK_DATA)
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| GRUB_PIT_SPK_TMR2,
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GRUB_PIT_SPEAKER_PORT);
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/* Wait. */
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while ((grub_inb (TIMER2_REG_LATCH) & TIMER2_LATCH) == 0x00);
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while ((grub_inb (GRUB_PIT_SPEAKER_PORT) & GRUB_PIT_SPK_TMR2_LATCH) == 0x00);
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/* Disable timer2 gate and speaker. */
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grub_outb (grub_inb (TIMER2_REG_LATCH) & ~ (TIMER2_SPEAKER | TIMER2_GATE),
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TIMER2_REG_LATCH);
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grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
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& ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
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GRUB_PIT_SPEAKER_PORT);
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}
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@ -0,0 +1,131 @@
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2011,2012,2013 Free Software Foundation, Inc.
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*
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* GRUB 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 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/term.h>
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#include <grub/misc.h>
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/dl.h>
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#include <grub/time.h>
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#include <grub/speaker.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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#define BASE_TIME 250
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static const char codes[0x80][6] =
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{
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['0'] = { 3, 3, 3, 3, 3, 0 },
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['1'] = { 1, 3, 3, 3, 3, 0 },
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['2'] = { 1, 1, 3, 3, 3, 0 },
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['3'] = { 1, 1, 1, 3, 3, 0 },
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['4'] = { 1, 1, 1, 1, 3, 0 },
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['5'] = { 1, 1, 1, 1, 1, 0 },
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['6'] = { 3, 1, 1, 1, 1, 0 },
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['7'] = { 3, 3, 1, 1, 1, 0 },
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['8'] = { 3, 3, 3, 1, 1, 0 },
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['9'] = { 3, 3, 3, 3, 1, 0 },
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['a'] = { 1, 3, 0 },
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['b'] = { 3, 1, 1, 1, 0 },
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['c'] = { 3, 1, 3, 1, 0 },
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['d'] = { 3, 1, 1, 0 },
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['e'] = { 1, 0 },
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['f'] = { 1, 1, 3, 1, 0 },
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['g'] = { 3, 3, 1, 0 },
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['h'] = { 1, 1, 1, 1, 0 },
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['i'] = { 1, 1, 0 },
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['j'] = { 1, 3, 3, 3, 0 },
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['k'] = { 3, 1, 3, 0 },
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['l'] = { 1, 3, 1, 1, 0 },
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['m'] = { 3, 3, 0 },
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['n'] = { 3, 1, 0 },
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['o'] = { 3, 3, 3, 0 },
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['p'] = { 1, 3, 3, 1, 0 },
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['q'] = { 3, 3, 1, 3, 0 },
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['r'] = { 1, 3, 1, 0 },
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['s'] = { 1, 1, 1, 0 },
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['t'] = { 3, 0 },
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['u'] = { 1, 1, 3, 0 },
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['v'] = { 1, 1, 1, 3, 0 },
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['w'] = { 1, 3, 3, 0 },
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['x'] = { 3, 1, 1, 3, 0 },
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['y'] = { 3, 1, 3, 3, 0 },
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['z'] = { 3, 3, 1, 1, 0 }
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};
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static void
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grub_audio_tone (int length)
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{
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grub_speaker_beep_on (1000);
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grub_millisleep (length);
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grub_speaker_beep_off ();
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}
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static void
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grub_audio_putchar (struct grub_term_output *term __attribute__ ((unused)),
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const struct grub_unicode_glyph *c_in)
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{
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grub_uint8_t c;
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int i;
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/* For now, do not try to use a surrogate pair. */
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if (c_in->base > 0x7f)
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c = '?';
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else
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c = grub_tolower (c_in->base);
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for (i = 0; codes[c][i]; i++)
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{
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grub_audio_tone (codes[c][i] * BASE_TIME);
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grub_millisleep (BASE_TIME);
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}
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grub_millisleep (2 * BASE_TIME);
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}
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static int
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dummy (void)
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{
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return 0;
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}
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static struct grub_term_output grub_audio_term_output =
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{
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.name = "morse",
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.init = (void *) dummy,
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.fini = (void *) dummy,
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.putchar = grub_audio_putchar,
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.getwh = (void *) dummy,
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.getxy = (void *) dummy,
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.gotoxy = (void *) dummy,
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.cls = (void *) dummy,
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.setcolorstate = (void *) dummy,
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.setcursor = (void *) dummy,
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.normal_color = GRUB_TERM_DEFAULT_NORMAL_COLOR,
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.highlight_color = GRUB_TERM_DEFAULT_HIGHLIGHT_COLOR,
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.flags = GRUB_TERM_CODE_TYPE_ASCII | GRUB_TERM_DUMB
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};
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GRUB_MOD_INIT (morse)
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{
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grub_term_register_output ("audio", &grub_audio_term_output);
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}
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GRUB_MOD_FINI (morse)
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{
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grub_term_unregister_output (&grub_audio_term_output);
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}
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@ -0,0 +1,106 @@
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/* console.c -- Open Firmware console for GRUB. */
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/*
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* GRUB -- GRand Unified Bootloader
|
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* Copyright (C) 2003,2004,2005,2007,2008,2009 Free Software Foundation, Inc.
|
||||
*
|
||||
* GRUB 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 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* GRUB is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
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||||
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#include <grub/term.h>
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#include <grub/types.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/time.h>
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#include <grub/terminfo.h>
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#include <grub/dl.h>
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#include <grub/speaker.h>
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GRUB_MOD_LICENSE ("GPLv3+");
|
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|
||||
extern struct grub_terminfo_output_state grub_spkmodem_terminfo_output;
|
||||
|
||||
static void
|
||||
put (struct grub_term_output *term __attribute__ ((unused)), const int c)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 7; i >= 0; i--)
|
||||
{
|
||||
if ((c >> i) & 1)
|
||||
grub_speaker_beep_on (2000);
|
||||
else
|
||||
grub_speaker_beep_on (4000);
|
||||
grub_millisleep (10);
|
||||
grub_speaker_beep_on (1000);
|
||||
grub_millisleep (10);
|
||||
}
|
||||
grub_speaker_beep_on (50);
|
||||
}
|
||||
|
||||
static grub_err_t
|
||||
grub_spkmodem_init_output (struct grub_term_output *term)
|
||||
{
|
||||
grub_speaker_beep_on (50);
|
||||
grub_millisleep (50);
|
||||
|
||||
grub_terminfo_output_init (term);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static grub_err_t
|
||||
grub_spkmodem_fini_output (struct grub_term_output *term __attribute__ ((unused)))
|
||||
{
|
||||
grub_speaker_beep_off ();
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
struct grub_terminfo_output_state grub_spkmodem_terminfo_output =
|
||||
{
|
||||
.put = put,
|
||||
.width = 80,
|
||||
.height = 24
|
||||
};
|
||||
|
||||
static struct grub_term_output grub_spkmodem_term_output =
|
||||
{
|
||||
.name = "spkmodem",
|
||||
.init = grub_spkmodem_init_output,
|
||||
.fini = grub_spkmodem_fini_output,
|
||||
.putchar = grub_terminfo_putchar,
|
||||
.getxy = grub_terminfo_getxy,
|
||||
.getwh = grub_terminfo_getwh,
|
||||
.gotoxy = grub_terminfo_gotoxy,
|
||||
.cls = grub_terminfo_cls,
|
||||
.setcolorstate = grub_terminfo_setcolorstate,
|
||||
.setcursor = grub_terminfo_setcursor,
|
||||
.flags = GRUB_TERM_CODE_TYPE_ASCII,
|
||||
.data = &grub_spkmodem_terminfo_output,
|
||||
.normal_color = GRUB_TERM_DEFAULT_NORMAL_COLOR,
|
||||
.highlight_color = GRUB_TERM_DEFAULT_HIGHLIGHT_COLOR,
|
||||
};
|
||||
|
||||
GRUB_MOD_INIT (spkmodem)
|
||||
{
|
||||
grub_term_register_output ("spkmodem", &grub_spkmodem_term_output);
|
||||
}
|
||||
|
||||
|
||||
GRUB_MOD_FINI (spkmodem)
|
||||
{
|
||||
grub_term_unregister_output (&grub_spkmodem_term_output);
|
||||
}
|
||||
|
|
@ -22,6 +22,84 @@
|
|||
#include <grub/types.h>
|
||||
#include <grub/err.h>
|
||||
|
||||
enum
|
||||
{
|
||||
/* The PIT channel value ports. You can write to and read from them.
|
||||
Do not mess with timer 0 or 1. */
|
||||
GRUB_PIT_COUNTER_0 = 0x40,
|
||||
GRUB_PIT_COUNTER_1 = 0x41,
|
||||
GRUB_PIT_COUNTER_2 = 0x42,
|
||||
/* The PIT control port. You can only write to it. Do not mess with
|
||||
timer 0 or 1. */
|
||||
GRUB_PIT_CTRL = 0x43,
|
||||
/* The speaker port. */
|
||||
GRUB_PIT_SPEAKER_PORT = 0x61,
|
||||
};
|
||||
|
||||
|
||||
/* The speaker port. */
|
||||
enum
|
||||
{
|
||||
/* If 0, follow state of SPEAKER_DATA bit, otherwise enable output
|
||||
from timer 2. */
|
||||
GRUB_PIT_SPK_TMR2 = 0x01,
|
||||
/* If SPEAKER_TMR2 is not set, this provides direct input into the
|
||||
speaker. Otherwise, this enables or disables the output from the
|
||||
timer. */
|
||||
GRUB_PIT_SPK_DATA = 0x02,
|
||||
|
||||
GRUB_PIT_SPK_TMR2_LATCH = 0x20
|
||||
};
|
||||
|
||||
/* The PIT control port. You can only write to it. Do not mess with
|
||||
timer 0 or 1. */
|
||||
enum
|
||||
{
|
||||
GRUB_PIT_CTRL_SELECT_MASK = 0xc0,
|
||||
GRUB_PIT_CTRL_SELECT_0 = 0x00,
|
||||
GRUB_PIT_CTRL_SELECT_1 = 0x40,
|
||||
GRUB_PIT_CTRL_SELECT_2 = 0x80,
|
||||
|
||||
/* Read and load control. */
|
||||
GRUB_PIT_CTRL_READLOAD_MASK= 0x30,
|
||||
GRUB_PIT_CTRL_COUNTER_LATCH = 0x00, /* Hold timer value until read. */
|
||||
GRUB_PIT_CTRL_READLOAD_LSB = 0x10, /* Read/load the LSB. */
|
||||
GRUB_PIT_CTRL_READLOAD_MSB = 0x20, /* Read/load the MSB. */
|
||||
GRUB_PIT_CTRL_READLOAD_WORD = 0x30, /* Read/load the LSB then the MSB. */
|
||||
|
||||
/* Mode control. */
|
||||
GRUB_PIT_CTRL_MODE_MASK = 0x0e,
|
||||
/* Interrupt on terminal count. Setting the mode sets output to low.
|
||||
When counter is set and terminated, output is set to high. */
|
||||
GRUB_PIT_CTRL_INTR_ON_TERM = 0x00,
|
||||
/* Programmable one-shot. When loading counter, output is set to
|
||||
high. When counter terminated, output is set to low. Can be
|
||||
triggered again from that point on by setting the gate pin to
|
||||
high. */
|
||||
GRUB_PIT_CTRL_PROGR_ONE_SHOT = 0x02,
|
||||
|
||||
/* Rate generator. Output is low for one period of the counter, and
|
||||
high for the other. */
|
||||
GRUB_PIT_CTRL_RATE_GEN = 0x04,
|
||||
|
||||
/* Square wave generator. Output is low for one half of the period,
|
||||
and high for the other half. */
|
||||
GRUB_PIT_CTRL_SQUAREWAVE_GEN = 0x06,
|
||||
/* Software triggered strobe. Setting the mode sets output to high.
|
||||
When counter is set and terminated, output is set to low. */
|
||||
GRUB_PIT_CTRL_SOFTSTROBE = 0x08,
|
||||
|
||||
/* Hardware triggered strobe. Like software triggered strobe, but
|
||||
only starts the counter when the gate pin is set to high. */
|
||||
GRUB_PIT_CTRL_HARDSTROBE = 0x0a,
|
||||
|
||||
|
||||
/* Count mode. */
|
||||
GRUB_PIT_CTRL_COUNT_MASK = 0x01,
|
||||
GRUB_PIT_CTRL_COUNT_BINARY = 0x00, /* 16-bit binary counter. */
|
||||
GRUB_PIT_CTRL_COUNT_BCD = 0x01 /* 4-decade BCD counter. */
|
||||
};
|
||||
|
||||
void EXPORT_FUNC(grub_pit_wait) (grub_uint16_t tics);
|
||||
|
||||
#endif /* ! KERNEL_CPU_PIT_HEADER */
|
||||
|
|
|
|||
|
|
@ -0,0 +1,47 @@
|
|||
#ifndef GRUB_SPEAKER_HEADER
|
||||
#define GRUB_SPEAKER_HEADER 1
|
||||
|
||||
#include <grub/cpu/io.h>
|
||||
#include <grub/i386/pit.h>
|
||||
|
||||
/* The frequency of the PIT clock. */
|
||||
#define GRUB_SPEAKER_PIT_FREQUENCY 0x1234dd
|
||||
|
||||
static inline void
|
||||
grub_speaker_beep_off (void)
|
||||
{
|
||||
unsigned char status;
|
||||
|
||||
status = grub_inb (GRUB_PIT_SPEAKER_PORT);
|
||||
grub_outb (status & ~(GRUB_PIT_SPK_TMR2 | GRUB_PIT_SPK_DATA),
|
||||
GRUB_PIT_SPEAKER_PORT);
|
||||
}
|
||||
|
||||
static inline void
|
||||
grub_speaker_beep_on (grub_uint16_t pitch)
|
||||
{
|
||||
unsigned char status;
|
||||
unsigned int counter;
|
||||
|
||||
if (pitch < 20)
|
||||
pitch = 20;
|
||||
else if (pitch > 20000)
|
||||
pitch = 20000;
|
||||
|
||||
counter = GRUB_SPEAKER_PIT_FREQUENCY / pitch;
|
||||
|
||||
/* Program timer 2. */
|
||||
grub_outb (GRUB_PIT_CTRL_SELECT_2
|
||||
| GRUB_PIT_CTRL_READLOAD_WORD
|
||||
| GRUB_PIT_CTRL_SQUAREWAVE_GEN
|
||||
| GRUB_PIT_CTRL_COUNT_BINARY, GRUB_PIT_CTRL);
|
||||
grub_outb (counter & 0xff, GRUB_PIT_COUNTER_2); /* LSB */
|
||||
grub_outb ((counter >> 8) & 0xff, GRUB_PIT_COUNTER_2); /* MSB */
|
||||
|
||||
/* Start speaker. */
|
||||
status = grub_inb (GRUB_PIT_SPEAKER_PORT);
|
||||
grub_outb (status | GRUB_PIT_SPK_TMR2 | GRUB_PIT_SPK_DATA,
|
||||
GRUB_PIT_SPEAKER_PORT);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
@ -0,0 +1,98 @@
|
|||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
/* Compilation: gcc -o spkmodem-recv spkmodem-recv */
|
||||
/* Usage: parecord --channels=1 --rate=48000 --format=s16le | ./spkmodem-recv */
|
||||
|
||||
#define RATE 48000
|
||||
#define SAMPLES_PER_TRAME 480
|
||||
#define AMPLITUDE_THRESHOLD 100000
|
||||
#define FREQ_SEP_MIN 15
|
||||
#define FREQ_SEP_NOM 20
|
||||
#define FREQ_SEP_MAX 25
|
||||
|
||||
#define FREQ_DATA_MIN 10
|
||||
#define FREQ_DATA_THRESHOLD 60
|
||||
#define FREQ_DATA_MAX 120
|
||||
#define AMPLITUDE_SAMPLES 2 * SAMPLES_PER_TRAME
|
||||
|
||||
#define THRESHOLD 1000
|
||||
|
||||
#define DEBUG 0
|
||||
|
||||
static signed short trame[2 * SAMPLES_PER_TRAME];
|
||||
static signed short pulse[2 * SAMPLES_PER_TRAME];
|
||||
static int ringpos = 0;
|
||||
static int pos, f1, f2;
|
||||
static int amplitude = 0;
|
||||
static int lp = 0;
|
||||
|
||||
static void
|
||||
read_sample (void)
|
||||
{
|
||||
amplitude -= abs (trame[ringpos]);
|
||||
f1 -= pulse[ringpos];
|
||||
f1 += pulse[(ringpos + SAMPLES_PER_TRAME) % (2 * SAMPLES_PER_TRAME)];
|
||||
f2 -= pulse[(ringpos + SAMPLES_PER_TRAME) % (2 * SAMPLES_PER_TRAME)];
|
||||
fread (trame + ringpos, 1, sizeof (trame[0]), stdin);
|
||||
amplitude += abs (trame[ringpos]);
|
||||
|
||||
if (pos ? (trame[ringpos] < -THRESHOLD)
|
||||
: (trame[ringpos] > +THRESHOLD))
|
||||
{
|
||||
pulse[ringpos] = 1;
|
||||
pos = !pos;
|
||||
f2++;
|
||||
}
|
||||
else
|
||||
pulse[ringpos] = 0;
|
||||
ringpos++;
|
||||
ringpos %= 2 * SAMPLES_PER_TRAME;
|
||||
lp++;
|
||||
}
|
||||
|
||||
int
|
||||
main ()
|
||||
{
|
||||
int bitn = 7;
|
||||
char c = 0;
|
||||
int i;
|
||||
while (!feof (stdin))
|
||||
{
|
||||
if (lp > 20000)
|
||||
{
|
||||
fflush (stdout);
|
||||
bitn = 7;
|
||||
c = 0;
|
||||
lp = 0;
|
||||
}
|
||||
if (f2 > 12 && f2 < 25
|
||||
&& f1 > 5 && f1 < 120)
|
||||
{
|
||||
#if DEBUG
|
||||
printf ("%d %d %d @%d\n", f1, f2, FREQ_DATA_THRESHOLD,
|
||||
ftell (stdin) - sizeof (trame));
|
||||
#endif
|
||||
if (f1 < 60)
|
||||
c |= (1 << bitn);
|
||||
bitn--;
|
||||
if (bitn < 0)
|
||||
{
|
||||
#if DEBUG
|
||||
printf ("<%c, %x>", c, c);
|
||||
#else
|
||||
printf ("%c", c);
|
||||
#endif
|
||||
bitn = 7;
|
||||
c = 0;
|
||||
}
|
||||
lp = 0;
|
||||
for (i = 0; i < SAMPLES_PER_TRAME; i++)
|
||||
read_sample ();
|
||||
continue;
|
||||
}
|
||||
read_sample ();
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue