userial is an Free project building an USB to I2C/SPI/GPIO bridge, using the Atmel AT90USB647 chip. Hardware and Software are released under an Open Source licence. It supports the following interfaces: * USB interface (serial emulation) * JTAG * I2C (TWI) * SPI * 8 General purpose digital I/O * 4 Analog to Digital converters (currently no firmware support)

userial-firmware-v1.6
.....................\bootloader
.....................\..........\BootloaderCDC.c
.....................\..........\BootloaderCDC.eep
.....................\..........\BootloaderCDC.elf
.....................\..........\BootloaderCDC.h
.....................\..........\BootloaderCDC.hex
.....................\..........\BootloaderCDC.lss
.....................\..........\BootloaderCDC.lst
.....................\..........\BootloaderCDC.map
.....................\..........\BootloaderCDC.o
.....................\..........\BootloaderCDC.sym
.....................\..........\Descriptors.c
.....................\..........\Descriptors.h
.....................\..........\Descriptors.lst
.....................\..........\Descriptors.o
.....................\..........\Makefile
.....................\cbuf.c
.....................\cbuf.h
.....................\cbuf.o
.....................\cdc.h
.....................\cdc_descriptors.c
.....................\cdc_descriptors.h
.....................\cdc_descriptors.o
.....................\ChangeLog
.....................\command.c
.....................\command.h
.....................\command.o
.....................\COPYING
.....................\debug.h
.....................\doc
.....................\...\bookinfo.xml
.....................\...\chap_fwupgrade.xml
.....................\...\chap_hardware.xml
.....................\...\chap_intro.xml
.....................\...\chap_software.xml
.....................\...\images


.....................\...\Makefile
.....................\...\meta
.....................\...\....\style.css
.....................\...\....\stylesheet-fo.xsl
.....................\...\....\stylesheet-html.xsl
.....................\...\userial.xml
.....................\gpio.c
.....................\gpio.h
.....................\gpio.o
.....................\hardware.c
.....................\hardware.h
.....................\hardware.o
.....................\i2c.c
.....................\i2c.h
.....................\i2c.o
.....................\LUFA
.....................\....\Common
.....................\....\......\BoardTypes.h
.....................\....\......\ButtLoadTag.h
.....................\....\......\Common.h
.....................\....\......\FunctionAttributes.h
.....................\....\Drivers
.....................\....\.......\AT90USBXXX
.....................\....\.......\..........\ADC.h
.....................\....\.......\..........\AT90USBXXX67
.....................\....\.......\..........\............\ADC.h
.....................\....\.......\..........\Serial.c
.....................\....\.......\..........\Serial.h
.....................\....\.......\..........\Serial_Stream.c
.....................\....\.......\..........\Serial_Stream.h
.....................\....\.......\..........\SPI.h
.....................\....\.......\Board
.....................\....\.......\.....\ATAVRUSBRF01
.....................\....\.......\.....\............\HWB.h
.....................\....\.......\.....\............\LEDs.h
.....................\....\.......\.....\Dataflash.h
.....................\....\.......\.....\HWB.h
.....................\....\.......\.....\Joystick.h
.....................\....\.......\.....\LEDs.h
.....................\....\.......\.....\RZUSBSTICK
.....................\....\.......\.....\..........\LEDs.h
.....................\....\.......\.....\STK525
.....................\....\.......\.....\......\AT45DB321C.h
.....................\....\.......\.....\......\Dataflash.h
.....................\....\.......\.....\......\HWB.h
.....................\....\.......\.....\......\Joystick.h
.....................\....\.......\.....\......\LEDs.h
.....................\....\.......\.....\STK526
.....................\....\.......\.....\......\AT45DB642D.h
.....................\....\.......\.....\......\Dataflash.h
.....................\....\.......\.....\......\HWB.h
.....................\....\.......\.....\......\Joystick.h
.....................\....\.......\.....\......\LEDs.h
.....................\....\.......\.....\Temperature.c
.....................\....\.......\.....

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