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From 259d86f862615a6135d96553768b564785f56a30 Mon Sep 17 00:00:00 2001
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From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
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Date: Mon, 21 Jan 2013 21:05:33 +0100
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Subject: [PATCH 136/482] Improve spkmodem reliability by adding a separator
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between bytes.
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---
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grub-core/term/spkmodem.c | 14 +++++++-------
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1 file changed, 7 insertions(+), 7 deletions(-)
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diff --git a/grub-core/term/spkmodem.c b/grub-core/term/spkmodem.c
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index 5bff429..f20a27d 100644
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--- a/grub-core/term/spkmodem.c
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+++ b/grub-core/term/spkmodem.c
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@@ -70,12 +70,7 @@ put (struct grub_term_output *term __attribute__ ((unused)), const int c)
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{
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int i;
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- if (!inited)
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- {
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- make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 50, 20);
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- inited = 1;
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- }
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-
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+ make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 200, 4);
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for (i = 7; i >= 0; i--)
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{
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if ((c >> i) & 1)
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@@ -84,12 +79,17 @@ put (struct grub_term_output *term __attribute__ ((unused)), const int c)
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make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 4000, 40);
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make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 1000, 10);
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}
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- make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 50, 0);
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+ make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 200, 0);
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}
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static grub_err_t
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grub_spkmodem_init_output (struct grub_term_output *term)
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{
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+ /* Some models shutdown sound when not in use and it takes for it
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+ around 30 ms to come back on which loses 3 bits. So generate a base
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+ 200 Hz continously. */
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+
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+ make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 200, 0);
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grub_terminfo_output_init (term);
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return 0;
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--
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1.8.2.1
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