grub2/0136-Improve-spkmodem-reliability-by-adding-a-separator-b.patch

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2013-06-07 18:03:56 +00:00
From 259d86f862615a6135d96553768b564785f56a30 Mon Sep 17 00:00:00 2001
From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Date: Mon, 21 Jan 2013 21:05:33 +0100
Subject: [PATCH 136/482] Improve spkmodem reliability by adding a separator
between bytes.
---
grub-core/term/spkmodem.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/grub-core/term/spkmodem.c b/grub-core/term/spkmodem.c
index 5bff429..f20a27d 100644
--- a/grub-core/term/spkmodem.c
+++ b/grub-core/term/spkmodem.c
@@ -70,12 +70,7 @@ put (struct grub_term_output *term __attribute__ ((unused)), const int c)
{
int i;
- if (!inited)
- {
- make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 50, 20);
- inited = 1;
- }
-
+ make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 200, 4);
for (i = 7; i >= 0; i--)
{
if ((c >> i) & 1)
@@ -84,12 +79,17 @@ put (struct grub_term_output *term __attribute__ ((unused)), const int c)
make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 4000, 40);
make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 1000, 10);
}
- make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 50, 0);
+ make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 200, 0);
}
static grub_err_t
grub_spkmodem_init_output (struct grub_term_output *term)
{
+ /* Some models shutdown sound when not in use and it takes for it
+ around 30 ms to come back on which loses 3 bits. So generate a base
+ 200 Hz continously. */
+
+ make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 200, 0);
grub_terminfo_output_init (term);
return 0;
--
2013-06-07 18:03:56 +00:00
1.8.2.1