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This commit is contained in:
Russell Gallop
2011-08-12 11:30:40 +01:00
parent f1b575c585
commit b1656cb2db
1 changed files with 42 additions and 57 deletions
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39
module_usb_midi/src/usb_midi.xc
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@@ -57,8 +57,7 @@ int uin_count = 0; // UART bytes in
void usb_midi(in port ?p_midi_in, out port ?p_midi_out, void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
clock ?clk_midi, clock ?clk_midi,
chanend c_midi, chanend c_midi,
unsigned cable_number) unsigned cable_number) {
{
unsigned symbol = 0x0; // Symbol in progress of being sent out unsigned symbol = 0x0; // Symbol in progress of being sent out
unsigned outputting = 0; // Guard when outputting data unsigned outputting = 0; // Guard when outputting data
unsigned time; // Timer value used for outputting unsigned time; // Timer value used for outputting
@@ -111,8 +110,7 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
while (1) { while (1) {
int is_ack; int is_ack;
unsigned int datum; unsigned int datum;
select select {
{
// Input to read the start bit // Input to read the start bit
#ifndef MIDI_LOOPBACK #ifndef MIDI_LOOPBACK
#ifdef MIDI_IN_4BIT_PORT #ifdef MIDI_IN_4BIT_PORT
@@ -130,8 +128,7 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
break; break;
// Input to read the remaining bits // Input to read the remaining bits
case isRX => t2 when timerafter(rxT) :> int _ : case isRX => t2 when timerafter(rxT) :> int _ :
if (rxI++ < 8) if (rxI++ < 8) {
{
// shift in bits into the high end of a word // shift in bits into the high end of a word
unsigned bit; unsigned bit;
p_midi_in :> bit; p_midi_in :> bit;
@@ -139,14 +136,11 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
rxT += bit_time; rxT += bit_time;
rxPT += bit_time; rxPT += bit_time;
asm("setpt res[%0],%1"::"r"(p_midi_in),"r"(rxPT)); asm("setpt res[%0],%1"::"r"(p_midi_in),"r"(rxPT));
} } else {
else
{
unsigned bit; unsigned bit;
// rcv and check stop bit // rcv and check stop bit
p_midi_in :> bit; p_midi_in :> bit;
if ((bit & 0x1) == 1) if ((bit & 0x1) == 1) {
{
unsigned valid = 0; unsigned valid = 0;
unsigned event = 0; unsigned event = 0;
uin_count++; uin_count++;
@@ -169,11 +163,9 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
} else { } else {
enqueue(to_host_fifo, event); enqueue(to_host_fifo, event);
} }
} } else if (valid) {
else if (valid) {
// printstr("g"); // printstr("g");
} }
} }
isRX = 0; isRX = 0;
} }
@@ -184,8 +176,7 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
// until symbol is zero expect pattern like 10'b1dddddddd0 // until symbol is zero expect pattern like 10'b1dddddddd0
// This code will leave the output high afterwards due to the stop bit added with makeSymbol // This code will leave the output high afterwards due to the stop bit added with makeSymbol
case outputting => t when timerafter(time) :> int _: case outputting => t when timerafter(time) :> int _:
if (symbol == 0) if (symbol == 0) {
{
uout_count++; uout_count++;
outputted_symbol = outputting_symbol; outputted_symbol = outputting_symbol;
// have we got another symbol to send to uart? // have we got another symbol to send to uart?
@@ -204,12 +195,9 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
t :> time; t :> time;
time += bit_time; time += bit_time;
txPT += bit_time; txPT += bit_time;
} } else
else
outputting = 0; outputting = 0;
} } else {
else
{
time += bit_time; time += bit_time;
txPT += bit_time; txPT += bit_time;
p_midi_out @ txPT <: (symbol & 1); p_midi_out @ txPT <: (symbol & 1);
@@ -227,12 +215,10 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
//printstr("uart->decouple\n"); //printstr("uart->decouple\n");
outuint(c_midi, dequeue(to_host_fifo)); outuint(c_midi, dequeue(to_host_fifo));
th_count++; th_count++;
} } else {
else {
waiting_for_ack = 0; waiting_for_ack = 0;
} }
} } else {
else {
int event; int event;
unsigned midi[3]; unsigned midi[3];
unsigned size; unsigned size;
@@ -248,8 +234,7 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
outuint(c_midi, event); outuint(c_midi, event);
th_count++; th_count++;
waiting_for_ack = 1; waiting_for_ack = 1;
} } else {
else {
event = byterev(event); event = byterev(event);
enqueue(to_host_fifo, event); enqueue(to_host_fifo, event);
} }