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Add a new module implementing a queue data structure.

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Since the functions are simple make them inline functions. This provides a
small code size saving.
This commit is contained in:
Richard Osborne
2013-11-29 18:36:35 +00:00
parent 93590833cf
commit a695e58524
10 changed files with 164 additions and 126 deletions
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36
module_usb_midi/src/usb_midi.xc
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@@ -49,6 +49,8 @@ extern unsigned polltime;
timer iAPTimer;
#endif
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
void usb_midi(port ?p_midi_in, port ?p_midi_out,
clock ?clk_midi,
chanend ?c_midi,
@@ -71,23 +73,23 @@ void usb_midi(port ?p_midi_in, port ?p_midi_out,
timer t2;
// One place buffer for data going out to host
queue midi_to_host_fifo;
unsigned char midi_to_host_fifo_arr[4]; // Used for 32bit USB MIDI events
queue_t midi_to_host_fifo;
unsigned midi_to_host_fifo_arr[1]; // Used for 32bit USB MIDI events
unsigned outputting_symbol, outputted_symbol;
struct midi_in_parse_state mips;
// the symbol fifo (to go out of uart)
queue symbol_fifo;
unsigned char symbol_fifo_arr[USB_MIDI_DEVICE_OUT_FIFO_SIZE * 4]; // Used for 32bit USB MIDI events
queue_t symbol_fifo;
unsigned symbol_fifo_arr[USB_MIDI_DEVICE_OUT_FIFO_SIZE]; // Used for 32bit USB MIDI events
unsigned rxPT, txPT;
int midi_from_host_overflow = 0;
//configure_clock_rate(clk_midi, 100, 1);
init_queue(symbol_fifo, symbol_fifo_arr, USB_MIDI_DEVICE_OUT_FIFO_SIZE, 4);
init_queue(midi_to_host_fifo, midi_to_host_fifo_arr, 1, 4);
queue_init(symbol_fifo, ARRAY_SIZE(symbol_fifo_arr));
queue_init(midi_to_host_fifo, ARRAY_SIZE(midi_to_host_fifo_arr));
configure_out_port(p_midi_out, clk_midi, 1<<MIDI_SHIFT_TX);
configure_in_port(p_midi_in, clk_midi);
@@ -174,7 +176,7 @@ void usb_midi(port ?p_midi_in, port ?p_midi_out,
// }
{valid, event} = midi_in_parse(mips, cable_number, rxByte);
if (valid && isempty(midi_to_host_fifo))
if (valid && queue_is_empty(midi_to_host_fifo))
{
event = byterev(event);
@@ -189,7 +191,7 @@ void usb_midi(port ?p_midi_in, port ?p_midi_out,
}
else
{
enqueue(midi_to_host_fifo, event);
queue_push_word(midi_to_host_fifo, midi_to_host_fifo_arr, event);
}
}
else if (valid)
@@ -215,10 +217,10 @@ void usb_midi(port ?p_midi_in, port ?p_midi_out,
// When it has just finished sending a symbol
// Take from FIFO
outputting_symbol = dequeue(symbol_fifo);
outputting_symbol = queue_pop_word(symbol_fifo, symbol_fifo_arr);
symbol = makeSymbol(outputting_symbol);
if (space(symbol_fifo) > 3 && midi_from_host_overflow)
if (queue_space(symbol_fifo) > 3 && midi_from_host_overflow)
{
midi_from_host_overflow = 0;
midi_send_ack(c_midi);
@@ -244,7 +246,7 @@ void usb_midi(port ?p_midi_in, port ?p_midi_out,
// Finished sending byte
uout_count++;
outputted_symbol = outputting_symbol;
if (isempty(symbol_fifo))
if (queue_is_empty(symbol_fifo))
{ // FIFO empty
isTX = 0;
}
@@ -259,10 +261,10 @@ void usb_midi(port ?p_midi_in, port ?p_midi_out,
{
// have we got more data to send
//printstr("ack\n");
if (!isempty(midi_to_host_fifo))
if (!queue_is_empty(midi_to_host_fifo))
{
//printstr("uart->decouple\n");
outuint(c_midi, dequeue(midi_to_host_fifo));
outuint(c_midi, queue_pop_word(midi_to_host_fifo, midi_to_host_fifo_arr));
th_count++;
}
else
@@ -278,7 +280,7 @@ void usb_midi(port ?p_midi_in, port ?p_midi_out,
int event = byterev(datum);
mr_count++;
#ifdef MIDI_LOOPBACK
if (isempty(midi_to_host_fifo))
if (queue_is_empty(midi_to_host_fifo))
{
// data to send to host
if (!waiting_for_ack)
@@ -292,7 +294,7 @@ void usb_midi(port ?p_midi_in, port ?p_midi_out,
else
{
event = byterev(event);
enqueue(midi_to_host_fifo, event);
queue_push_word(midi_to_host_fifo, midi_to_host_fifo_arr, event);
}
midi_send_ack(c_midi);
}
@@ -305,10 +307,10 @@ void usb_midi(port ?p_midi_in, port ?p_midi_out,
for (int i = 0; i != size; i++)
{
// add symbol to fifo
enqueue(symbol_fifo, midi[i]);
queue_push_word(symbol_fifo, symbol_fifo_arr, midi[i]);
}
if (space(symbol_fifo) > 3)
if (queue_space(symbol_fifo) > 3)
{
midi_send_ack(c_midi);
}