Add build script for ldpc and i2s stuff

tx/build.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+
+# Make sure we're in the right directory.
+cd ~/wenet/tx/
+
+# Build LDPC Encoder Library
+echo "Building LDPC Encoder Library."
+gcc -fPIC -shared -o ldpc_enc.so ldpc_enc.c
+
+# Build i2s drivers
+cd i2smaster
+
+echo "Building I2S Driver"
+dtc -@ -H epapr -O dtb -o i2smaster.dtbo -Wno-unit_address_vs_reg i2smaster.dts
+
+# Install driver
+echo "Installing I2S Driver (requires sudo)"
+sudo cp i2smaster.dtbo /boot/overlays
+
+
+cd ~/wenet/tx/
+echo "Now continue with the instructions to modify your /boot/firmware/config.txt file to enable I2S."