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Avoid serial buffer overrun on leonardo

This commit is contained in:
Peter Van Hoyweghen 2012-07-30 21:54:19 +02:00 committed by David A. Mellis
parent e2b99206d8
commit 6ab2a9f95e
2 changed files with 9 additions and 3 deletions
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10
hardware/arduino/cores/arduino/CDC.cpp
View File

@ -141,16 +141,22 @@ void Serial_::end(void)
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) {
// while we have room to store a byte
while (i != buffer->tail) {
int c = USB_Recv(CDC_RX);
if (c == -1)
break; // no more data
buffer->buffer[buffer->head] = c;
buffer->head = i;
i = (unsigned int)(buffer->head+1) % SERIAL_BUFFER_SIZE;
}
}

2
hardware/arduino/cores/arduino/USBCore.cpp
View File

@ -603,7 +603,7 @@ ISR(USB_GEN_vect)
{
#ifdef CDC_ENABLED
USB_Flush(CDC_TX); // Send a tx frame if found
while (USB_Available(CDC_RX)) // Handle received bytes (if any)
if (USB_Available(CDC_RX)) // Handle received bytes (if any)
Serial.accept();
#endif