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Replace fifo with queue implementation.

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Russell Gallop
2011-08-11 16:31:07 +01:00
parent 5f0a15d4dc
commit ded512dc4b
1 changed files with 24 additions and 42 deletions
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66
module_usb_midi/src/usb_midi.xc
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@@ -1,9 +1,10 @@
#include <xs1.h>
#include <xclib.h>
#include <print.h>
#include "usb_midi.h"
#include "midiinparse.h"
#include "midioutparse.h"
#include <print.h>
#include "queue.h"
//#define MIDI_LOOPBACK 1
@@ -78,22 +79,23 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
struct midi_in_parse_state mips;
// the symbol fifo (to go out of uart)
queue q;
unsigned symbol_fifo[USB_MIDI_DEVICE_OUT_FIFO_SIZE];
int rdptr = 0;
int wrptr = 0;
unsigned rxPT, txPT;
int midi_from_host_overflow = 0;
//configure_clock_rate(clk_midi, 100, 1);
//configure_clock_rate(clk_midi, 100, 1);
init_queue(q, symbol_fifo, USB_MIDI_DEVICE_OUT_FIFO_SIZE);
configure_out_port_no_ready(p_midi_out, clk_midi, 1);
configure_in_port(p_midi_in, clk_midi);
configure_out_port_no_ready(p_midi_out, clk_midi, 1);
configure_in_port(p_midi_in, clk_midi);
start_clock(clk_midi);
start_port(p_midi_out);
start_port(p_midi_in);
reset_midi_state(mips);
start_clock(clk_midi);
start_port(p_midi_out);
start_port(p_midi_in);
reset_midi_state(mips);
t :> time;
t2 :> rxT;
@@ -186,20 +188,12 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
uout_count++;
outputted_symbol = outputting_symbol;
// have we got another symbol to send to uart?
if (rdptr != wrptr) { // FIFO not empty
int space_left;
if (!isempty(q)) { // FIFO not empty
// Take from FIFO
outputting_symbol = symbol_fifo[rdptr];
symbol = makeSymbol(symbol_fifo[rdptr]);
rdptr++;
if (rdptr > USB_MIDI_DEVICE_OUT_FIFO_SIZE - 1)
rdptr = 0;
outputting_symbol = dequeue(q);
symbol = makeSymbol(outputting_symbol);
space_left = rdptr - wrptr;
if (space_left < 0)
space_left += USB_MIDI_DEVICE_OUT_FIFO_SIZE;
if (space_left > 3 && midi_from_host_overflow) {
if (space(q) > 3 && midi_from_host_overflow) {
midi_from_host_overflow = 0;
midi_send_ack(c_midi);
}
@@ -242,7 +236,6 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
int event;
unsigned midi[3];
unsigned size;
int space_left;
// received data from host
event = byterev(datum);
mr_count++;
@@ -266,32 +259,21 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
{midi[0], midi[1], midi[2], size} = midi_out_parse(event);
for (int i = 0; i != size; i++) {
// add symbol to fifo
symbol_fifo[wrptr] = midi[i];
wrptr++;
if (wrptr > USB_MIDI_DEVICE_OUT_FIFO_SIZE - 1) {
wrptr = 0;
}
enqueue(q, midi[i]);
}
space_left = rdptr - wrptr;
if (space_left < 0)
space_left += USB_MIDI_DEVICE_OUT_FIFO_SIZE;
if (space_left > 3) {
if (space(q) > 3) {
midi_send_ack(c_midi);
} else {
midi_from_host_overflow = 1;
}
// Start sending from FIFO
if (wrptr != rdptr && !outputting) {
outputting_symbol = symbol_fifo[rdptr];
symbol = makeSymbol(symbol_fifo[rdptr]);
rdptr++;
if (rdptr > USB_MIDI_DEVICE_OUT_FIFO_SIZE - 1)
rdptr = 0;
if (!isempty(q) && !outputting) {
outputting_symbol = dequeue(q);
symbol = makeSymbol(outputting_symbol);
if (space_left > 2 && midi_from_host_overflow) {
if (space(q) > 2 && midi_from_host_overflow) {
midi_from_host_overflow = 0;
midi_send_ack(c_midi);
}