DESFire emulation support: Bug fixes, improvements and updated LibNFC test code

Doc/BuilingFirmwareBinariesFromSource.md

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+# Building the Chameleon Mini RevG firmware from source
+
+Users that are preparing to reflash their older generation RevE devices should 
+see [this software](https://github.com/iceman1001/ChameleonMini-rebooted) 
+for the latest sources to compile fresh binaries to flash onto their Chameleon Mini. 
+Because the AVR chips on the Chameleon Mini RevE devices have less memory, the configurations 
+such as those for 
+[DESFire tags](https://github.com/emsec/ChameleonMini/blob/master/Doc/DESFireSupportReadme.md) 
+will (most likely) not work if the firmware binaries are built 
+using the source code in this repository. 
+
+## Prerequisites
+
+Users need to install ``avr-gcc`` developer packages and GNU ``make`` to compile the sources.
+To flash the firmware onto the Chameleon over USB, users will need to install software such as 
+``avrdude``. On Linux and Unix systems, users will likely need to setup extra ``udev`` rules on their 
+system so the Chameleon Mini is recognized as a USB device in bootloader (flash) and runtime modes. 
+Details on this configuration are found on the 
+[getting started WIKI](https://rawgit.com/emsec/ChameleonMini/master/Doc/Doxygen/html/_page__getting_started.html).
+
+## Cloning
+
+```bash
+$ git clone ttps://@github.com/emsec/ChameleonMini.git
+$ cd ChameleonMini/Firmware/ChameleonMini
+```
+If you are working from an older cloned source, make sure to update to the latest by running 
+```bash
+$ git pull
+```
+
+## Customizing the build
+
+The complexity and memory requirements needed to have all possible 
+[configurations](https://rawgit.com/emsec/ChameleonMini/master/Doc/Doxygen/html/_page__configurations.html) 
+(list not comprehensive) 
+enabled for use on the Chameleon are too demanding for the onboard AVR chip. 
+Users will have to choose a subset that includes support for only a few configurations at 
+a time (reflash to use firmware built with others). 
+There are several custom targets that make building specialized firmware possible. 
+They include one of the following strings (henceforth ``BUILD_TARGET``):
+```bash
+mifare, mifare-classic, desfire, desfire-dev, iso-modes, ntag215, vicinity, sls2s2002, titagit, em4233, misc-tags
+```
+Precise up-to-date information about which configurations are supported by each build variant are found by reviewing the 
+[build script source](https://github.com/emsec/ChameleonMini/blob/master/Firmware/Chameleon-Mini/BuildScripts/custom_build_targets.mk). 
+The per-build configuration lists are currently as follows:
+
+* ``mifare``: ``MF_CLASSIC_MINI_4B``, ``MF_CLASSIC_1K``, ``MF_CLASSIC_1K_7B``, ``MF_CLASSIC_4K``, ``MF_CLASSIC_4K_7B`` and ``MF_ULTRALIGHT``
+* ``mifare-classic``: ``MF_CLASSIC_MINI_4B``, ``MF_CLASSIC_1K``, ``MF_CLASSIC_1K_7B``, ``MF_CLASSIC_4K`` and ``MF_CLASSIC_4K_7B``
+* ``desfire``, ``desfire-dev``: ``MF_DESFIRE``, ``MF_DESFIRE_2KEV1``, ``MF_DESFIRE_4KEV1`` and ``MF_DESFIRE_4KEV2``
+* ``iso-modes``: ``ISO14443A_SNIFF``, ``ISO14443A_READER``, ``ISO15693_SNIFF`` and ``MF_ULTRALIGHT``
+* ``ntag215``: ``NTAG215``
+* ``vicinity``: ``VICINITY``
+* ``sl2s2002``: ``SL2S2002``
+* ``titagit``: ``TITAGITSTANDARD`` and ``TITAGITPLUS``
+* ``em4233``: ``EM4233``
+* ``misc-tags``: ``NTAG215``, ``VICINITY``, ``SL2S2002``, ``TITAGITSTANDARD``, ``TITAGITPLUS`` and ``EM4233``
+
+### Choosing prepacakaged firmware binaries
+
+Latest builds supporting ISO14443, ISO1593 and DESFire (non development) are generated automatically on the 
+main Chameleon Mini firmware repository 
+(see [this listing](https://github.com/emsec/ChameleonMini/actions)). 
+
+### More customized builds
+
+Users that wish to build a hybrid of any of the above ``make`` targets may edit the 
+``Makefile`` in the current working directory (as set in the cloning step above) and set the 
+``BUILD_TARGET`` varaible to empty (i.e., build the source by just running ``make`` below). 
+*Caveat emptor*: the warning is again that enabling too much functionality in the firmware build may cause 
+errors due to memory restrictions. 
+
+## Compiling the source
+
+Build the source by running
+```bash
+$ make $BUILD_TARGET
+```
+For example, to build the firmware with DESFire support and extra printing of debugging information that 
+can be printed with ``LOGMODE=LIVE`` and viewed with the 
+[Chameleon Mini Live Debugger](https://github.com/maxieds/ChameleonMiniLiveDebugger) 
+application for Android phones, we run
+```bash
+$ make desfire-dev
+```
+
+## Flashing the firmware 
+
+See the [getting started documentation](https://rawgit.com/emsec/ChameleonMini/master/Doc/Doxygen/html/_page__getting_started.html) 
+for more information. The flash command using ``avrdude`` on Linux is the following:
+```bash
+$ export FIRMWARE_TARGET=Chameleon-Mini
+$ sudo avrdude -c flip2 -p ATXMega128A4U -B 60 -P usb -U application:w:$FIRMWARE_TARGET.hex:i -U eeprom:w:$FIRMWARE_TARGET.eep:i
+```
+More information about flashing Chameleon devices on odd platforms and hardware setups is 
+[found here (Linux/Unix)](https://github.com/iceman1001/ChameleonMini-rebooted/wiki/Flashing-Linux-(Unix)) and [here (Mac OSX)](https://github.com/iceman1001/ChameleonMini-rebooted/wiki/Flashing-OSX).
+
+## Getting up and running with the Chameleon Mini over serial USB
+
+Users can install ``minicom`` to interface to the Chameleon Mini. 
+Configuration details are OS specific and are found elsewhere. 
+Alternately, if users wish to use a portable interface and log viewer on their 
+Android device with Google Play Store, see the 
+[CMLD application WIKI](https://github.com/maxieds/ChameleonMiniLiveDebugger/wiki/GettingStarted).
+Python-based software to download and view the logs on the Chameleon is located 
+[in this directory](https://github.com/emsec/ChameleonMini/tree/master/Software/ChamTool). 
+Sample dumps for several configuration types that can be uploaded onto the running 
+Chameleon device are [located here](https://github.com/emsec/ChameleonMini/tree/master/Dumps).