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Update some comments

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This commit is contained in:
Gregory Nutt 2015-05-18 08:53:24 -06:00
parent 14160b715e
commit 82f51d01fb
1 changed files with 10 additions and 2 deletions
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12
drivers/usbdev/cdcacm.c
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@ -460,8 +460,16 @@ static inline int cdcacm_recvpacket(FAR struct cdcacm_dev_s *priv,
}
/* Then copy data into the RX buffer until either: (1) all of the data has been
* copied, or (2) the RX buffer is full. NOTE: If the RX buffer becomes full,
* then we have overrun the serial driver and data will be lost.
* copied, or (2) the RX buffer is full.
*
* NOTE: If the RX buffer becomes full, then we have overrun the serial driver
* and data will be lost. This is the correct behavior for a proper emulation
* of a serial link. It should not NAK, it should drop data like a physical
* serial port.
*
* If you don't like that behavior. DO NOT change it here. Instead, you should
* finish the implementation of RX flow control which is the only proper way
* to throttle a serial device.
*/
while (nexthead != recv->tail && nbytes < reqlen)