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.
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@ -1,6 +1,7 @@
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/* Copyright (c) 2010, Peter Barrett
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/* Copyright (c) 2010, Peter Barrett
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** Sleep/Wakeup support added by Michael Dreher
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**
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** Permission to use, copy, modify, and/or distribute this software for
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** any purpose with or without fee is hereby granted, provided that the
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@ -266,6 +267,11 @@ int USB_Send(u8 ep, const void* d, int len)
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if (!_usbConfiguration)
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return -1;
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if (_usbSuspendState & (1<<SUSPI)) {
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//send a remote wakeup
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UDCON |= (1 << RMWKUP);
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}
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int r = len;
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const u8* data = (const u8*)d;
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u8 timeout = 250; // 250ms timeout on send? TODO
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