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This simplifies the baud rate calculation, removing the need for a goto
and shortening the code a bit. Other than that, this code should not use
any different settings than before.
Code was suggested by Rob Tillaart on github.
Closes: #1262
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operator bool()
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There are two begin methods, one which accepts just a baud rate and
uses the default bit settings and one which accepts both a baudrate and
a bit config. Previously, both of these contained a complete
implementation, but now the former just calls the latter, explicitely
passing the default 8N1 configuration.
Technically, this causes a small change: Before the UCSRC register was
untouched when calling begin(baud), now it is explicitely initialized
with 8N1. However, since this is the default configuration for at least
the Uno and the Mega (didn't check any others), probably for all avrs,
this shouldn't effectively change anything. Given that the Arduino
documentation also documents this as the default when none is passed,
explicitly setting it is probably a good idea in any case.
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Fixes #1568
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This removes the need for doing an extra pointer dereference on every
access to the buffers, shrinking the code by around 100 bytes.
The members for these buffers must be public for now, since the
interrupt handlers also need to access them. These can later be made
private again.
Furthermore, the struct ring_buffer was removed. This allows the all
head and tail pointers to be put into the HardwareSerial struct before
the actual buffers, so the pointers all end up in the first 32 bytes of
the struct that can be accessed using a single instruction (ldd).
References: #947
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Since the buffers aren't bigger than 64 bytes, these values can be
smaller. This saves a few bytes of ram, but also saves around 50 bytes
of program space, since the values can now be loaded using a single
instruction.
To prevent problems when people manually increase the buffer size, a
compile-time check is added.
Closes: #1078
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See #881
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Fixes #831 #881 #955 #1123 #1140
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Otherwise, you get an error when compiling for processors with no serial port because the header file is always compiled.
See, for an example of the problem: https://github.com/damellis/attiny/issues/8
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Before, the UMSELn1 bit was being to set to 1, putting the UART into a reserved mode. Now, we only set the high (0x80) bit to 1 for the ATmega8, which is needed to access UCSRnC (whose i/o address is shared with UBRRH).
Also, no longer bitwise-or the new config with the existing register value, because we're actually configuring all the settings in the register. (We're not using UCPOL, but it's supposed to be 0 in asynchronous mode.)
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Serial.begin() parameter to set data bits, parity, stop bits.
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http://code.google.com/p/arduino/issues/detail?id=871
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New Serial.begin(baud, config);
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New Serial.begin(baud, config);
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Adding advanced begin (); with the ability to specify the length of bits, parity, stop bits.
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Adding advanced begin (); with the ability to specify the length of bits, parity, stop bits.
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Adding advanced begin (); with the ability to specify the length of bits, parity, stop bits.
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is ready to send data.
Mostly useful for Leonardo - simple way to test whether the port is actually opened by an application and ready to receive data. For Serial objects attached to real UARTs always returns true.
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http://code.google.com/p/arduino/issues/detail?id=776
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new-extension
Conflicts:
build/linux/dist/tools/avrdude.conf
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http://code.google.com/p/arduino/issues/detail?id=626
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arduino protocol for Leonardo avrdude upload.
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new-extension
Conflicts:
build/macosx/dist/tools-universal.zip
build/windows/avr_tools.zip
hardware/arduino/cores/arduino/HardwareSerial.cpp
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http://code.google.com/p/arduino/issues/detail?id=584
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write(), print(), println() now return size_t (and don't use negative values to signal errors).
Print adds writeError() for checking for write errors, clearWriteError() to reset the flag to false, and a protected setWriteError() for signalling errors.
http://code.google.com/p/arduino/issues/detail?id=598
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The type is long, and negative values indicate errors. Needs more testing.
http://code.google.com/p/arduino/issues/detail?id=551
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Because UBBR is only 12 bits, we were overflowing it at 300 baud because of the use of the U2X bit. Now we turn off U2X if it would yield a UBBR value that would overflow.
Note that this breaks 300 baud communication with the computer on the Uno and Mega 2560 because the 8U2 USB-serial firmware has this same bug (and previously they cancelled each other out). Since, however, it seems more likely that people will need to use 300 baud to communicate with other (legacy) hardware than with the computer, I'm making this change. Issue for 8U2 firmware bug: http://code.google.com/p/arduino/issues/detail?id=542
http://code.google.com/p/arduino/issues/detail?id=522
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begin(long) -> begin(unsigned long)
Conflicts:
hardware/arduino/cores/arduino/HardwareSerial.h
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Called from within the serial receive interrupt. These are implemented as an empty weak function in the core that be overridden by the user's sketch.
http://code.google.com/p/arduino/issues/detail?id=263
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This brings it in line with most other uses of flush(), both in and out of Arduino.
http://code.google.com/p/arduino/issues/detail?id=497
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That is, waiting for outgoing data to transmit and dropping any received data.
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Now Serial.write() places characters in the transmit buffer, and the data register empty interrupt reads and transmit them. Based loosely on the implementation here: ftp://wookey.org.uk/arduino.
http://code.google.com/p/arduino/issues/detail?id=262
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http://code.google.com/p/arduino/issues/detail?id=391
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57600 baud at 16 MHz.
http://code.google.com/p/arduino/issues/detail?id=394
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Mark Sproul's patches, via Christian Maglie.
http://code.google.com/p/arduino/issues/detail?id=315
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another stream might need more than 255 bytes).
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