int USBLink::receive(uint8_t *data, uint32_t len, uint16_t timeoutMs)
{
uint32_t time, start, timeout = timeoutMs * CLKFREQ_MS;
if (!USB_handleState())
{
g_bufUsed = 0;
g_recvComplete = 0;
return -1;
}
if (timeout==0) // this is special case...
{
if (len>GBUF_SIZE || g_bufUsed!=0&&g_bufUsed!=len)
return LINK_RESULT_ERROR;
if (g_bufUsed==0)
{
g_bufUsed = len;
// register receive buffer
USB_Recv(g_buf, g_bufUsed);
}
else if (g_recvComplete) // if it has come in, then copy
{
memcpy((void *)data, (void *)g_buf, len);
g_bufUsed = 0;
return len;
}
return 0;
}
else
{
if (g_bufUsed!=0) // if we have a receive pending, reset
USB_RecvReset();
USB_Recv(data, len);
}
// wait
while(1)
{
start = g_recvTimerStart; // avoid race condition with usb interrupt routine-- sample here
time = LPC_TIMER1->TC; // time is guaranteed to be more recent than start
if ((uint32_t)(time-start) > timeout || g_recvComplete)
break;
}
if (g_recvComplete)
return len;
else
{
USB_RecvReset();
return LINK_RESULT_ERROR_RECV_TIMEOUT;
}
}
void UsbMidiModule::_poll()
{
midi_event_t midiEvent;
int numReceived;
while (numReceived = USB_Recv(getOutEndpointId(), &midiEvent, sizeof(midiEvent)))
{
// MIDI USB messages are 4 bytes in size.
if (numReceived != 4)
return;
// They get decoded to up to 3 MIDI Serial bytes.
u8 data[3];
unsigned count = UsbToMidi::process(midiEvent, data);
if (m_midiInFifo.hasSpaceFor(count))
{
for (unsigned i=0; i<count; ++i)
{
m_midiInFifo.push(data[i]);
}
}
}
}
// Recv 1 byte if ready
int USB_Recv(u8 ep)
{
u8 c;
if (USB_Recv(ep,&c,1) != 1)
return -1;
return c;
}
int
USB_Recv(uint8_t ep)
{
uint8_t c;
if (USB_Recv(ep, &c, 1) == 1)
return (c);
return (-1);
}
int Serial_::read(void)
{
if (peek_buffer >= 0) {
int c = peek_buffer;
peek_buffer = -1;
return c;
}
return USB_Recv(CDC_RX);
}
void
CDC::accept()
{
while (m_ibuf->room()) {
int c = USB_Recv(CDC_RX);
if (c == IOStream::EOF) break;
m_ibuf->putchar(c);
}
}
int Serial_::peek(void)
{
if (peek_buffer < 0)
{
if(USBDevice.configured())
{
peek_buffer = USB_Recv(CDC_RX);
}
}
return peek_buffer;
}
int Serial_::read(void)
{
int c;
if (_serialPeek != -1)
{
c = _serialPeek;
_serialPeek = -1;
} else {
c = USB_Recv(CDC_RX);
}
return c;
}
void Serial_::accept(void)
{
ring_buffer *buffer = &cdc_rx_buffer;
int c = USB_Recv(CDC_RX);
int i = (unsigned int)(buffer->head+1) % SERIAL_BUFFER_SIZE;
// if we should be storing the received character into the location
// just before the tail (meaning that the head would advance to the
// current location of the tail), we're about to overflow the buffer
// and so we don't write the character or advance the head.
if (i != buffer->tail) {
buffer->buffer[buffer->head] = c;
buffer->head = i;
}
}
int Serial_::read(void)
{
if (peek_buffer >= 0)
{
int c = peek_buffer;
peek_buffer = -1;
return c;
}
if(USBDevice.configured())
{
return USB_Recv(CDC_RX);
}
return -1;
}
void MIDIUSB_::accept(void)
{
midi_buffer *buffer = &(this->_rx_buffer);
int i = (unsigned int)(buffer->head+1) % MIDI_BUFFER_SIZE;
// if we should be storing the received character into the location
// just before the tail (meaning that the head would advance to the
// current location of the tail), we're about to overflow the buffer
// and so we don't write the character or advance the head.
// while we have room to store a byte
while (i != buffer->tail) {
int c = USB_Recv(MIDI_RX);
if (c == -1)
break; // no more data
buffer->buffer[buffer->head] = c;
buffer->head = i;
i = (unsigned int)(buffer->head+1) % MIDI_BUFFER_SIZE;
}
}
int Serial_::peek(void)
{
if (peek_buffer < 0)
peek_buffer = USB_Recv(CDC_RX);
return peek_buffer;
}
