--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>
+<processnetwork xmlns="http://www.tik.ee.ethz.ch/~shapes/schema/PROCESSNETWORK" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.tik.ee.ethz.ch/~shapes/schema/PROCESSNETWORK
+http://www.tik.ee.ethz.ch/~shapes/schema/processnetwork.xsd" name="FFT">
+
+ <!--
+ N is the number of FFT points
+ number_of_layers = ld(N)
+ processes_per_layer = N/2
+ -->
+
+ <!--
+ <variable value="4" name="N"/>
+ <variable value="2" name="NUMBER_OF_LAYERS"/>
+ <variable value="2" name="PROCESSES_PER_LAYER"/>
+ -->
+
+ <!--
+ <variable value="8" name="N"/>
+ <variable value="3" name="NUMBER_OF_LAYERS"/>
+ <variable value="4" name="PROCESSES_PER_LAYER"/>
+ -->
+
+ <variable value="16" name="N"/>
+ <variable value="4" name="NUMBER_OF_LAYERS"/>
+ <variable value="8" name="PROCESSES_PER_LAYER"/>
+
+ <!--
+ <variable value="32" name="N"/>
+ <variable value="5" name="NUMBER_OF_LAYERS"/>
+ <variable value="16" name="PROCESSES_PER_LAYER"/>
+ -->
+
+ <!--
+ <variable value="64" name="N"/>
+ <variable value="6" name="NUMBER_OF_LAYERS"/>
+ <variable value="32" name="PROCESSES_PER_LAYER"/>
+ -->
+
+ <!--
+ <variable value="128" name="N"/>
+ <variable value="7" name="NUMBER_OF_LAYERS"/>
+ <variable value="64" name="PROCESSES_PER_LAYER"/>
+ -->
+
+ <!--
+ <variable value="256" name="N"/>
+ <variable value="8" name="NUMBER_OF_LAYERS"/>
+ <variable value="128" name="PROCESSES_PER_LAYER"/>
+ -->
+
+ <function>
+ <![CDATA[
+ public static int bitreverse(int n, int N)
+ {
+ String numberString = Integer.toString(n, 2); //binary representation of n
+
+ //prepend zeros until string is N characters long
+ while (numberString.length() < N)
+ {
+ numberString = "0" + numberString;
+ }
+
+ //reverse the string
+ char[] numberCharArray = numberString.toCharArray();
+ for (int count = 0; count < numberCharArray.length / 2; count++)
+ {
+ char help = numberCharArray[count];
+ numberCharArray[count] = numberCharArray[N - 1 - count];
+ numberCharArray[N - 1 - count] = help;
+ }
+
+ //convert back to integer
+ return Integer.valueOf(String.valueOf(numberCharArray), 2);
+ }
+ ]]>
+ </function>
+
+ <function>
+ <![CDATA[
+ public static int butterfly(int layer, int p, int addOffset)
+ {
+ int index = 2 * (p % (1 << (layer - 1))) +
+ p / (1 << (layer - 1)) +
+ (p / (1 << layer)) * ((1 << (layer + 1)) - 2);
+
+ if (addOffset == 1)
+ return index + (1 << layer);
+
+ return index;
+ }
+ ]]>
+ </function>
+
+ <!-- instantiate processes -->
+ <process name="generator">
+ <iterator variable="i" range="N">
+ <port type="output" name="input_coefficients">
+ <append function="i"/>
+ </port>
+ </iterator>
+ <source type="c" location="generator.c"/>
+ </process>
+
+ <process name="consumer">
+ <iterator variable="i" range="N">
+ <port type="input" name="output_coefficients">
+ <append function="i"/>
+ </port>
+ </iterator>
+ <source type="c" location="consumer.c"/>
+ </process>
+
+ <iterator variable="i" range="NUMBER_OF_LAYERS">
+ <iterator variable="j" range="PROCESSES_PER_LAYER">
+ <process name="fft2">
+ <append function="i"/>
+ <append function="j"/>
+ <port type="input" name="inA"/>
+ <port type="input" name="inB"/>
+ <port type="output" name="outA"/>
+ <port type="output" name="outB"/>
+ <source type="c" location="fft2.c"/>
+ </process>
+ </iterator>
+ </iterator>
+
+ <!-- instantiate channels -->
+ <!-- channels for input and output coefficients -->
+ <iterator variable="i" range="N">
+ <sw_channel type="fifo" size="16" name="inputchannel">
+ <append function="i"/>
+ <port type="input" name="in"/>
+ <port type="output" name="out"/>
+ </sw_channel>
+ <sw_channel type="fifo" size="16" name="outputchannel">
+ <append function="i"/>
+ <port type="input" name="in"/>
+ <port type="output" name="out"/>
+ </sw_channel>
+ </iterator>
+
+ <!-- channels for butterfly network -->
+ <iterator variable="layer" range="NUMBER_OF_LAYERS - 1">
+ <iterator variable="i" range="N">
+ <sw_channel type="fifo" size="16" name="butterflychannel">
+ <append function="layer"/>
+ <append function="i"/>
+ <port type="input" name="in"/>
+ <port type="output" name="out"/>
+ </sw_channel>
+ </iterator>
+ </iterator>
+
+ <!-- instantiate connections -->
+ <!-- connections from input generator to input channel and from output channel to output consumer -->
+ <iterator variable="i" range="N">
+ <connection name="input_connection">
+ <append function="i"/>
+ <origin name="generator">
+ <port name="input_coefficients">
+ <append function="i"/>
+ </port>
+ </origin>
+ <target name="inputchannel">
+ <append function="i"/>
+ <port name="in"/>
+ </target>
+ </connection>
+ <connection name="output_connection">
+ <append function="i"/>
+ <origin name="outputchannel">
+ <append function="i"/>
+ <port name="out"/>
+ </origin>
+ <target name="consumer">
+ <port name="output_coefficients">
+ <append function="i"/>
+ </port>
+ </target>
+ </connection>
+ </iterator>
+
+ <!-- connections from FFT2 to channels -->
+ <iterator variable="layer" range="NUMBER_OF_LAYERS - 1">
+ <iterator variable="i" range="PROCESSES_PER_LAYER">
+ <connection name="layerkconnection_A">
+ <append function="layer + 1"/>
+ <append function="i"/>
+ <origin name="fft2">
+ <append function="layer"/>
+ <append function="i"/>
+ <port name="outA"/>
+ </origin>
+ <target name="butterflychannel">
+ <append function="layer"/>
+ <append function="2 * i"/>
+ <port name="in"/>
+ </target>
+ </connection>
+ <connection name="layerkconnection_B">
+ <append function="layer + 1"/>
+ <append function="i"/>
+ <origin name="fft2">
+ <append function="layer"/>
+ <append function="i"/>
+ <port name="outB"/>
+ </origin>
+ <target name="butterflychannel">
+ <append function="layer"/>
+ <append function="2 * i + 1"/>
+ <port name="in"/>
+ </target>
+ </connection>
+ </iterator>
+ </iterator>
+
+ <!-- connections from channels to FFT2 -->
+ <!-- connections from input channels to first FFT layer -->
+ <iterator variable="i" range="PROCESSES_PER_LAYER">
+ <connection name="layer1connection_A">
+ <append function="i"/>
+ <origin name="inputchannel">
+ <append function="bitreverse(2 * i, NUMBER_OF_LAYERS)"/>
+ <port name="out"/>
+ </origin>
+ <target name="fft2_0">
+ <append function="i"/>
+ <port name="inA"/>
+ </target>
+ </connection>
+ <connection name="layer1connection_B">
+ <append function="i"/>
+ <origin name="inputchannel">
+ <append function="bitreverse(2 * i + 1, NUMBER_OF_LAYERS)"/>
+ <port name="out"/>
+ </origin>
+ <target name="fft2_0">
+ <append function="i"/>
+ <port name="inB"/>
+ </target>
+ </connection>
+ </iterator>
+
+ <!-- connections from last FFT layer to output channels -->
+ <iterator variable="i" range="PROCESSES_PER_LAYER">
+ <connection name="lastlayerconnection_A">
+ <append function="i"/>
+ <origin name="fft2">
+ <append function="NUMBER_OF_LAYERS - 1"/>
+ <append function="i"/>
+ <port name="outA"/>
+ </origin>
+ <target name="outputchannel">
+ <append function="i"/>
+ <port name="in"/>
+ </target>
+ </connection>
+ <connection name="lastlayerconnection_B">
+ <append function="i"/>
+ <origin name="fft2">
+ <append function="NUMBER_OF_LAYERS - 1"/>
+ <append function="i"/>
+ <port name="outB"/>
+ </origin>
+ <target name="outputchannel">
+ <append function="i + PROCESSES_PER_LAYER"/>
+ <port name="in"/>
+ </target>
+ </connection>
+ </iterator>
+
+ <!-- other connections -->
+ <iterator variable="layer" range="NUMBER_OF_LAYERS - 1">
+ <iterator variable="i" range="PROCESSES_PER_LAYER">
+ <connection name="FFTconnection_A">
+ <append function="layer"/>
+ <append function="i"/>
+ <origin name="butterflychannel">
+ <append function="layer"/>
+ <append function="butterfly(layer + 1, i, 0)"/>
+ <port name="out"/>
+ </origin>
+ <target name="fft2">
+ <append function="layer + 1"/>
+ <append function="i"/>
+ <port name="inA"/>
+ </target>
+ </connection>
+ <connection name="FFTconnection_B">
+ <append function="layer"/>
+ <append function="i"/>
+ <origin name="butterflychannel">
+ <append function="layer"/>
+ <append function="butterfly(layer + 1, i, 1)"/>
+ <port name="out"/>
+ </origin>
+ <target name="fft2">
+ <append function="layer + 1"/>
+ <append function="i"/>
+ <port name="inB"/>
+ </target>
+ </connection>
+ </iterator>
+ </iterator>
+</processnetwork>
projects / jump.git / blobdiff