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Improve spkmodem reliability by adding a separator between bytes.

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Vladimir 'phcoder' Serbinenko 2013-01-21 21:05:33 +01:00
parent 4250985ae8
commit 18288f17ac
1 changed files with 7 additions and 7 deletions
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14
grub-core/term/spkmodem.c
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@ -70,12 +70,7 @@ put (struct grub_term_output *term __attribute__ ((unused)), const int c)
{ {
int i; int i;
if (!inited) make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 200, 4);
{
make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 50, 20);
inited = 1;
}
for (i = 7; i >= 0; i--) for (i = 7; i >= 0; i--)
{ {
if ((c >> i) & 1) 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 / 4000, 40);
make_tone (GRUB_SPEAKER_PIT_FREQUENCY / 1000, 10); 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 static grub_err_t
grub_spkmodem_init_output (struct grub_term_output *term) 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); grub_terminfo_output_init (term);
return 0; return 0;