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These are all of the USB-capable boards in the boards.txt file, all using the 32U4.
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The Arduino core is licensed, collectively, under the GNU Lesser General Public License, version 2.1. Individual files may be licensed more permissively. See https://www.arduino.cc/en/main/FAQ.
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XInput
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Returns true if the device USB is configured. Although will still return true if the device has been configured and the USB data pins disconnected...
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No reason not to take advantage of this feature, although with the interrupt in place I doubt it will be useful.
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Using the OUT endpoint interrupt
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Better to set these where intended so they can be easily overridden if need be.
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Easier for the AVR to deal with the memory if the in/out numbers aren't paired.
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This will compile but will NOT enumerate properly without a config descriptor. You've been warned...
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Allows sketches using Serial to compile but discards all data
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Unused if pluggable USB is not enabled. Should submit a PR to fix this in the main repo...
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Not compatible with XInput, which requires a static descriptor
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Can't be used since PluggableHID and XInput are mutually exclusive
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Distinguish at a glance from the 'normal' boards in the IDE
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Forking
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Removes boards from boards.txt, bootloaders for those boards, and variants for those boards. As none of these boards support USB there's no reason to keep them around.
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Required to separate this board set from the built-in AVR core
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Fixing SPI communication with a delay as pointe out in #6395
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Since we are now factory flashing obtiboot, 115200 is the new default upload speed. Adding a new entry to CPU menu is more explicit than adding an "upload speed" menu, and the bootloader path can be updated too.
Fixes https://github.com/arduino/Arduino/issues/4492
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Make write to UDR and clearing of TXC bit in flush() atomic
to avoid race condition.
Fixes #3745 (second different issue introduced later but discussed
in the same issue)
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Preserve values of configuration bits MPCMn and U2Xn.
Avoid setting other read-only bits for datasheet conformance.
See #3745
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Moving the head buffer pointer and setting interrupt flag is now
atomic in write(). Previously an intervening ISR could empty the
buffer before the second ISR is triggered causing retransmission.
Fixes: #3745 (original issue only)
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New macro TX_BUFFER_ATOMIC makes the following code block atomic
only if the transmit buffer is larger than 256 bytes. SREG is restored
on completion.
The macro is then used to simplify code for availableForWrite()
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In a MultiMaster I2C environment, The Default value of 0xFE in the TWAR cause the Arduino to respond as an I2C Slave device at address 0x7f. If the Wire.h library was not configured as a I2C Slave, `Wire.begin(slaveID);` the Callbacks for `twi_onSlaveTransmit()` and `twi_onSlaveReceive()` are never initialized.
But, they are called during servicing the TWI ISR. This causes a reboot of the Arduino by jumping to an uninitialized function address (0).
So, this fix initializes them to the Default Wire.h handler which will respond correctly even during Master Mode operations.
A MASTER MODE only Arduino will respond to all Slave Calls that match TWAR, Unless the TWEA bit is disabled outside of Master Transactions.
Chuck.
It also initialized the TWAR to the General Call ID (0x0) and Disables General Call responses.
Chuck.
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Instead of checking for the NEW_LUFA_SIGNATURE once in program memory and then
setting a flag which is used for further checks, a function is used that always
checks program memory directly.
If a flag is used, there's a slight chance that its location in RAM could fall
on MAGIC_KEY_POS. In this case, an aborted USB auto-reset sequence may fail.
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An auto-reset invoked using USB CDC is triggered by the port closing
(when set to 1200 baud). Closing of the port is indicated by DTR going inactive.
There is no need to have auto-reset invoked by a CDC_SET_LINE_CODING command.
Only the CDC_SET_CONTROL_LINE_STATE command, which indicates a change in the
state of DTR, should be used.
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The state of the watchdog timer is saved during a USB auto-reset and then
restored if the reset is aborted, in case the sketch is using the watchdog.
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In the USB CDC code to invoke an auto-reset, the magic key location could be
restored before it had actually been saved. The sketch would then have a
corrupted value at this location. This fix prevents the value from being
restored if it hasn't previously been saved.
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24, 44 and 84
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