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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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99
module_usb_midi/src/usb_midi.xc
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@@ -24,17 +24,17 @@ int mr_count = 0; // MIDI received (from HOST)
int th_count = 0; // MIDI sent (To Host)
#ifdef MIDI_LOOPBACK
static inline void handle_byte_from_uart(chanend c_midi, struct midi_in_parse_state &mips, int cable_number,
static inline void handle_byte_from_uart(chanend c_midi, struct midi_in_parse_state &mips, int cable_number,
int &got_next_event, int &next_event, int &waiting_for_ack, int byte)
{
int valid;
unsigned event;
{valid, event} = midi_in_parse(mips, cable_number, byte);
{valid, event} = midi_in_parse(mips, cable_number, byte);
if (valid && !got_next_event) {
// data to send to host
if (!waiting_for_ack) {
// send data
event = byterev(event);
// send data
event = byterev(event);
outuint(c_midi, event);
th_count++;
waiting_for_ack = 1;
@@ -52,13 +52,12 @@ static inline void handle_byte_from_uart(chanend c_midi, struct midi_in_parse_
#endif
int uout_count = 0; // UART bytes out
int uin_count = 0; // UART bytes in
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,
chanend c_midi,
unsigned cable_number)
{
unsigned cable_number) {
unsigned symbol = 0x0; // Symbol in progress of being sent out
unsigned outputting = 0; // Guard when outputting data
unsigned time; // Timer value used for outputting
@@ -90,30 +89,29 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
//configure_clock_rate(clk_midi, 100, 1);
init_queue(symbol_fifo, symbol_fifo_arr, USB_MIDI_DEVICE_OUT_FIFO_SIZE);
init_queue(to_host_fifo, to_host_fifo_arr, 1);
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);
t :> time;
t2 :> rxT;
#ifndef MIDI_LOOPBACK
p_midi_out <: 1; // Start with high bit.
p_midi_out <: 1; // Start with high bit.
// printstr("mout0");
#endif
while (1) {
int is_ack;
unsigned int datum;
select
{
// Input to read the start bit
select {
// Input to read the start bit
#ifndef MIDI_LOOPBACK
#ifdef MIDI_IN_4BIT_PORT
case !isRX => p_midi_in when pinseq(0xE) :> void @ rxPT:
@@ -122,31 +120,27 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
#endif
isRX = 1;
t2 :> rxT;
rxT += (bit_time + bit_time_2);
rxT += (bit_time + bit_time_2);
rxPT += (bit_time + bit_time_2); // absorb start bit and set to halfway through the next bit
rxI = 0;
asm("setc res[%0],1"::"r"(p_midi_in));
asm("setpt res[%0],%1"::"r"(p_midi_in),"r"(rxPT));
break;
break;
// Input to read the remaining bits
case isRX => t2 when timerafter(rxT) :> int _ :
if (rxI++ < 8)
{
if (rxI++ < 8) {
// shift in bits into the high end of a word
unsigned bit;
p_midi_in :> bit;
rxByte = (bit << 31) | (rxByte >> 1);
rxT += bit_time;
rxPT += bit_time;
asm("setpt res[%0],%1"::"r"(p_midi_in),"r"(rxPT));
}
else
{
asm("setpt res[%0],%1"::"r"(p_midi_in),"r"(rxPT));
} else {
unsigned bit;
// rcv and check stop bit
p_midi_in :> bit;
if ((bit & 0x1) == 1)
{
if ((bit & 0x1) == 1) {
unsigned valid = 0;
unsigned event = 0;
uin_count++;
@@ -158,34 +152,31 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
{valid, event} = midi_in_parse(mips, cable_number, rxByte);
if (valid && isempty(to_host_fifo)) {
event = byterev(event);
event = byterev(event);
// data to send to host - add to fifo
if (!waiting_for_ack) {
// send data
// printstr("uart->decouple: ");
// send data
// printstr("uart->decouple: ");
outuint(c_midi, event);
waiting_for_ack = 1;
th_count++;
} else {
enqueue(to_host_fifo, event);
}
}
else if (valid) {
} else if (valid) {
// printstr("g");
}
}
}
isRX = 0;
}
break;
// Output
// If outputting then feed the bits out one at a time
// 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
case outputting => t when timerafter(time) :> int _:
if (symbol == 0)
{
if (symbol == 0) {
uout_count++;
outputted_symbol = outputting_symbol;
// have we got another symbol to send to uart?
@@ -204,19 +195,16 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
t :> time;
time += bit_time;
txPT += bit_time;
}
else
} else
outputting = 0;
}
else
{
} else {
time += bit_time;
txPT += bit_time;
p_midi_out @ txPT <: (symbol & 1);
// printstr("mout2\n");
symbol >>= 1;
}
break;
}
break;
#endif
case midi_get_ack_or_data(c_midi, is_ack, datum):
@@ -227,12 +215,10 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
//printstr("uart->decouple\n");
outuint(c_midi, dequeue(to_host_fifo));
th_count++;
}
else {
} else {
waiting_for_ack = 0;
}
}
else {
}
} else {
int event;
unsigned midi[3];
unsigned size;
@@ -243,13 +229,12 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
if (isempty(to_host_fifo)) {
// data to send to host
if (!waiting_for_ack) {
// send data
event = byterev(event);
// send data
event = byterev(event);
outuint(c_midi, event);
th_count++;
waiting_for_ack = 1;
}
else {
} else {
event = byterev(event);
enqueue(to_host_fifo, event);
}
@@ -260,13 +245,13 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
// add symbol to fifo
enqueue(symbol_fifo, midi[i]);
}
if (space(symbol_fifo) > 3) {
midi_send_ack(c_midi);
} else {
midi_from_host_overflow = 1;
}
// Start sending from FIFO
if (!isempty(symbol_fifo) && !outputting) {
outputting_symbol = dequeue(symbol_fifo);
@@ -275,11 +260,11 @@ void usb_midi(in port ?p_midi_in, out port ?p_midi_out,
if (space(symbol_fifo) > 2 && midi_from_host_overflow) {
midi_from_host_overflow = 0;
midi_send_ack(c_midi);
}
}
#ifdef MIDI_LOOPBACK
#ifdef MIDI_LOOPBACK
handle_byte_from_uart(c_midi, mips, cable_number, got_next_event, next_event, waiting_for_ack, symbol);
#else
#else
// Start sending byte (to be continued by outputting case)
p_midi_out <: 1 @ txPT;
t :> time;