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This file documents changes in the firmware-only USB driver for atmel's AVR |
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microcontrollers. New entries are always appended to the end of the file. |
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Scroll down to the bottom to see the most recent changes. |
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2005-04-01: |
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- Implemented endpoint 1 as interrupt-in endpoint. |
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- Moved all configuration options to usbconfig.h which is not part of the |
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driver. |
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- Changed interface for usbVendorSetup(). |
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- Fixed compatibility with ATMega8 device. |
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- Various minor optimizations. |
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2005-04-11: |
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- Changed interface to application: Use usbFunctionSetup(), usbFunctionRead() |
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and usbFunctionWrite() now. Added configuration options to choose which |
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of these functions to compile in. |
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- Assembler module delivers receive data non-inverted now. |
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- Made register and bit names compatible with more AVR devices. |
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2005-05-03: |
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- Allow address of usbRxBuf on any memory page as long as the buffer does |
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not cross 256 byte page boundaries. |
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- Better device compatibility: works with Mega88 now. |
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- Code optimization in debugging module. |
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- Documentation updates. |
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2006-01-02: |
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- Added (free) default Vendor- and Product-IDs bought from voti.nl. |
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- Added USBID-License.txt file which defines the rules for using the free |
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shared VID/PID pair. |
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- Added Readme.txt to the usbdrv directory which clarifies administrative |
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issues. |
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2006-01-25: |
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- Added "configured state" to become more standards compliant. |
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- Added "HALT" state for interrupt endpoint. |
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- Driver passes the "USB Command Verifier" test from usb.org now. |
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- Made "serial number" a configuration option. |
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- Minor optimizations, we now recommend compiler option "-Os" for best |
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results. |
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- Added a version number to usbdrv.h |
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2006-02-03: |
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- New configuration variable USB_BUFFER_SECTION for the memory section where |
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the USB rx buffer will go. This defaults to ".bss" if not defined. Since |
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this buffer MUST NOT cross 256 byte pages (not even touch a page at the |
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end), the user may want to pass a linker option similar to |
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"-Wl,--section-start=.mybuffer=0x800060". |
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- Provide structure for usbRequest_t. |
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- New defines for USB constants. |
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- Prepared for HID implementations. |
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- Increased data size limit for interrupt transfers to 8 bytes. |
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- New macro usbInterruptIsReady() to query interrupt buffer state. |
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2006-02-18: |
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- Ensure that the data token which is sent as an ack to an OUT transfer is |
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always zero sized. This fixes a bug where the host reports an error after |
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sending an out transfer to the device, although all data arrived at the |
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device. |
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- Updated docs in usbdrv.h to reflect changed API in usbFunctionWrite(). |
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* Release 2006-02-20 |
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- Give a compiler warning when compiling with debugging turned on. |
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- Added Oleg Semyonov's changes for IAR-cc compatibility. |
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- Added new (optional) functions usbDeviceConnect() and usbDeviceDisconnect() |
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(also thanks to Oleg!). |
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- Rearranged tests in usbPoll() to save a couple of instructions in the most |
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likely case that no actions are pending. |
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- We need a delay between the SET ADDRESS request until the new address |
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becomes active. This delay was handled in usbPoll() until now. Since the |
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spec says that the delay must not exceed 2ms, previous versions required |
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aggressive polling during the enumeration phase. We have now moved the |
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handling of the delay into the interrupt routine. |
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- We must not reply with NAK to a SETUP transaction. We can only achieve this |
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by making sure that the rx buffer is empty when SETUP tokens are expected. |
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We therefore don't pass zero sized data packets from the status phase of |
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a transfer to usbPoll(). This change MAY cause troubles if you rely on |
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receiving a less than 8 bytes long packet in usbFunctionWrite() to |
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identify the end of a transfer. usbFunctionWrite() will NEVER be called |
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with a zero length. |
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* Release 2006-03-14 |
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- Improved IAR C support: tiny memory model, more devices |
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- Added template usbconfig.h file under the name usbconfig-prototype.h |
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* Release 2006-03-26 |
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- Added provision for one more interrupt-in endpoint (endpoint 3). |
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- Added provision for one interrupt-out endpoint (endpoint 1). |
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- Added flowcontrol macros for USB. |
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- Added provision for custom configuration descriptor. |
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- Allow ANY two port bits for D+ and D-. |
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- Merged (optional) receive endpoint number into global usbRxToken variable. |
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- Use USB_CFG_IOPORTNAME instead of USB_CFG_IOPORT. We now construct the |
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variable name from the single port letter instead of computing the address |
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of related ports from the output-port address. |
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* Release 2006-06-26 |
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- Updated documentation in usbdrv.h and usbconfig-prototype.h to reflect the |
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new features. |
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- Removed "#warning" directives because IAR does not understand them. Use |
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unused static variables instead to generate a warning. |
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- Do not include <avr/io.h> when compiling with IAR. |
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- Introduced USB_CFG_DESCR_PROPS_* in usbconfig.h to configure how each |
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USB descriptor should be handled. It is now possible to provide descriptor |
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data in Flash, RAM or dynamically at runtime. |
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- STALL is now a status in usbTxLen* instead of a message. We can now conform |
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to the spec and leave the stall status pending until it is cleared. |
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- Made usbTxPacketCnt1 and usbTxPacketCnt3 public. This allows the |
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application code to reset data toggling on interrupt pipes. |
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* Release 2006-07-18 |
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- Added an #if !defined __ASSEMBLER__ to the warning in usbdrv.h. This fixes |
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an assembler error. |
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- usbDeviceDisconnect() takes pull-up resistor to high impedance now. |
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* Release 2007-02-01 |
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- Merged in some code size improvements from usbtiny (thanks to Dick |
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Streefland for these optimizations!) |
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- Special alignment requirement for usbRxBuf not required any more. Thanks |
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again to Dick Streefland for this hint! |
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- Reverted to "#warning" instead of unused static variables -- new versions |
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of IAR CC should handle this directive. |
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- Changed Open Source license to GNU GPL v2 in order to make linking against |
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other free libraries easier. We no longer require publication of the |
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circuit diagrams, but we STRONGLY encourage it. If you improve the driver |
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itself, PLEASE grant us a royalty free license to your changes for our |
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commercial license. |
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