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Send an USB remote wakeup if data need to be written 

On Linux, setting autosuspend_delay_ms to N and control to auto allows the host pc to suspend the peripheral. Some Linux distro (Ubuntu, Mint) apply this behaviour by default.
If the sketch's prints where less frequent than N milliseconds the sketch prints would never arrive.
This patch allows sending a remote wakeup event to unsuspend the peripheral and allow the serial prints to be received.
This commit is contained in:
Martino Facchin 2016-07-14 18:43:43 +02:00
parent 28e10e95da
commit 003d22f2a5
1 changed files with 7 additions and 1 deletions
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8
hardware/arduino/avr/cores/arduino/USBCore.cpp
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@ -1,6 +1,7 @@
/* Copyright (c) 2010, Peter Barrett
/* Copyright (c) 2010, Peter Barrett
** Sleep/Wakeup support added by Michael Dreher
**
** Permission to use, copy, modify, and/or distribute this software for
** any purpose with or without fee is hereby granted, provided that the
@ -266,6 +267,11 @@ int USB_Send(u8 ep, const void* d, int len)
if (!_usbConfiguration)
return -1;
if (_usbSuspendState & (1<<SUSPI)) {
//send a remote wakeup
UDCON |= (1 << RMWKUP);
}
int r = len;
const u8* data = (const u8*)d;
u8 timeout = 250; // 250ms timeout on send? TODO