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2011-12-05 Sebastien Bourdeauducq <seb@tmplab.org>

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* milkymist_midi/midi.c: move MIDI message detection from higher layers
	to the MIDI interrupt handler
This commit is contained in:
Gedare Bloom
2011-12-05 15:21:50 +00:00
parent df4669fb1e
commit 5144142533
2 changed files with 26 additions and 3 deletions
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5
c/src/lib/libbsp/lm32/shared/ChangeLog
View File

@@ -1,3 +1,8 @@
2011-12-05 Sebastien Bourdeauducq <seb@tmplab.org>
* milkymist_midi/midi.c: move MIDI message detection from higher layers
to the MIDI interrupt handler
2011-11-27 Sebastien Bourdeauducq <seb@tmplab.org>
PR 1972/bsps

24
c/src/lib/libbsp/lm32/shared/milkymist_midi/midi.c
View File

@@ -26,6 +26,8 @@
#define DEVICE_NAME "/dev/midi"
static rtems_id midi_q;
static unsigned char *midi_p = NULL;
static unsigned char midi_msg[3];
static rtems_isr interrupt_handler(rtems_vector_number n)
{
@@ -34,7 +36,23 @@ static rtems_isr interrupt_handler(rtems_vector_number n)
while (MM_READ(MM_MIDI_STAT) & MIDI_STAT_RX_EVT) {
msg = MM_READ(MM_MIDI_RXTX);
MM_WRITE(MM_MIDI_STAT, MIDI_STAT_RX_EVT);
rtems_message_queue_send(midi_q, &msg, 1);
if ((msg & 0xf8) == 0xf8)
continue; /* ignore system real-time */
if (msg & 0x80)
midi_p = midi_msg; /* status byte */
if (!midi_p)
continue; /* ignore extra or unsynchronized data */
*midi_p++ = msg;
if (midi_p == midi_msg+3) {
/* received a complete MIDI message */
rtems_message_queue_send(midi_q, midi_msg, 3);
midi_p = NULL;
}
}
lm32_interrupt_ack(1 << MM_IRQ_MIDI);
}
@@ -53,8 +71,8 @@ rtems_device_driver midi_initialize(
sc = rtems_message_queue_create(
rtems_build_name('M', 'I', 'D', 'I'),
64,
1,
32,
3,
0,
&midi_q
);