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\chapter{Software}
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Para transferir el diseño del usuario a la FPGA, PHR se sirve de las funciones de \emph{xc3sprog}\footnote{http://xc3sprog.sourceforge.net/}, un conjunto de aplicaciones de licencia libre que funciona en linea de comandos y que puede programar varios dispositivos mediante JTAG. Su nombre hace referencia a que inicialmente fue diseñado para la familia de FPGA Spartan-3 de Xilinx. Sin embargo se ha extendido el manejo a otros tipos de dispositivos que incluyen otras FPGAs, CPLDs, XCF flash PROMs, microprocesadores AVRs de Atmel y memorias flash SPI. Xc3sprog soporta varios cables JTAG, incluyendo cables de puerto paralelo y programadores USB.
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No obstante su funcionalidad, xc3sprog puede resultar no intuitivo para el usuario principiante, por lo que se ofrece una interfaz gráfica para invocar a xc3sprog de una manera muy simple.
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\section{PHR GUI}
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La Fig. \ref{gui:interfaz} muestra la ventana de la aplicación a la que se denomina \emph{PHR GUI}. Actualmente se encuentra en su versión 0.1 y está disponible para los sistemas operativos GNU/Linux y Windows.
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\begin{figure}[h!]
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\begin{center}
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\includegraphics[width=11cm]{./img/gui/phr-gui.png}
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\end{center}
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\caption[Interfaz gráfica de usuario]{Interfaz gráfica de usuario PHR GUI v0.1.}
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\label{gui:interfaz}
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\end{figure}
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\subsection{Funciones básicas}
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El software permite la realización de tres tareas básicas:
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\begin{description}
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\item[Comprobar conexión] Detecta los dispositivos en la cadena JTAG y los muestra. Cuando se conecta la PHR a través de OOCDLink el sofware lista a la FPGA y a la PROM:
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\begin{lstlisting}
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...
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JTAG loc.: 0 IDCODE: 0x02218093 Desc: XC3S200A Rev: A IR length: 6
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JTAG loc.: 1 IDCODE: 0xd5045093 Desc: XCF02S Rev: M IR length: 8
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...
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\end{lstlisting}
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\item[Configurar la FPGA] Transfiere un diseño sintetizado en el formato BIT de Xilinx a la FPGA. Los datos son volátiles.
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\begin{lstlisting}
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...
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Using built-in device list
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Using built-in cable list
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Cable ftdi type ftdi VID 0x0403 PID 0x6010 dbus data 00 enable 0b cbus data 00 data 00
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Using FTD2XX, Using JTAG frequency 1200000
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JTAG chainpos: 0 Device IDCODE = 0x02218093 Desc: XC3S200A
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Created from NCD file: test1_top.ncd;UserID=0xFFFFFFFF
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Target device: 3s200avq100
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Created: 2014/03/19 18:31:15
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Bitstream length: 1196128 bits
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DNA is 0x95cde80efb9ba0fe
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done. Programming time 1044.1 ms
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USB transactions: Write 84 read 9 retries 0
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\end{lstlisting}
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\item[Programar la PROM] Transfiere un diseño sintetizado en el formato BIT de Xilinx a la PROM. Los datos se guardan incluso cuando el circuito es desconectado de la alimentación.
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\begin{lstlisting}
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...
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JTAG chainpos: 1 Device IDCODE = 0xd5045093 Desc: XCF02S
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Erasing......done
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Erase time 3129.2 ms
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Programming does not end at block boundary (nbits = 1196128), padding
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Programming block 0/ 293 at XCF frame 0x0000.
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...
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Programming block 292/ 293 at XCF frame 0x2480.done
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Programming time 2802.2 ms
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Verify block 0/ 293 at XCF frame 0x0000
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...
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Verify block 278/ 293 at XCF frame 0x22c0
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VerSuccess! Verify time 1893.1 ms
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USB transactions: Write 1815 read 906 retries 0
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\end{lstlisting}
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\end{description}
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\subsection{Obtención de PHR GUI}
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El software PHR GUI se puede descargar de la sección de Descargas en sitio web del proyecto en OpenCores:
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\texttt{http://opencores.org/project,phr,descargas}.
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Asimismo se puede obtener la \emph{Guía de instalacion y uso} de la interfaz donde se explica mejor todo lo referente a la aplicación.
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