Installing nrsc5 for SDRplay on a Raspberry Pi

This document depends on one of the Operating System and driver installation pages.

Installation
- Install the prerequisites from the HD Radio NRSC5 decoder section on Installing utility software on a Raspberry Pi
- Installing nrsc5 for SDRplay API version 3
```
cd ~/
git clone https://github.com/fventuri/nrsc5.git nrsc5-sdrplay
cd nrsc5-sdrplay
mkdir build
cd build
cmake -DUSE_NEON=ON -DUSE_FAAD2=ON -DSDR_DRIVER=sdrplay -DLIBRARY_DEBUG_LEVEL=1 ..
make -j $(nproc)
# Only install one version...
sudo make install
sudo ldconfig
```
- Running nrsc5 with a SDRplay device
  - To display help
```
cd ~/nrsc5-sdrplay/build/src
./nrsc5
```
  - Open another terminal window to start the NRSC5 receiver
    It may take a minute or so to get the gain set and connection made.
```
# Syntax: nrsc5 -g <LNAstate.IFGR (IFGR=0 -> AGC enabled)> <Radios Station Frequency> <Program>
# For example:
cd ~/nrsc5-sdrplay/build/src
./nrsc5 -g 0.0 91.7 0
```
  - Usage
    - To switch between audio programs while the program is running, press 0, 1, 2, or 3
    - To quit, press Q.
  - Note: You may have trouble with nrsc5 constantly losing sync. Set the CPU governor to Performance.
    - For DietPi:
      - sudo dietpi-config
        Performance Options
        CPU Governor
        performance : Forces CPU frequency to 1500 MHz
    - For all linux distriubutions:
      - # This will set the CPU governor to performance, but it will not return after a reboot.
        sudo sh -c 'echo performance > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor'
- Install NRSC5-DUI
  Use NRSC5-DUI to play HD Radio instead of NRSC5. It adds a GUI and other features to NRSC5.
  - The prerequisites should have been installed for NRSC5 previously.
  - ```
  cd ~/
  git clone https://github.com/markjfine/nrsc5-dui.git
```
- Run NRSC5-DUI
```
  cd ~/nrsc5-dui
  python3 nrsc5-dui.py ~/nrsc5-sdrplay/build/src/
```
- Configure NRSC5-DUI
  - Click on the Settings tab
  - In SDR Radio, select SDRPlay
  - Enter the desired gain or click Auto.
    - The gain for SDRplay: LNAstate.IFGR (IFGR=0 -> AGC enabled)
    - Note that due to a bug in NRSC5-DUI, the incorrect gain value may be sent to NRSC5.
  - Enable the options you want, such as Download Album Art, Include Station Art, etc.
  - In the Frequency box, enter the frequency of the station that you wish to hear.
  - Click the Triangle Play button. It will be a minute or so before it starts to play.
  - Click the Info tab to see Station Info.
  - Album Art will be present on the Album Art tab if the station supports it.
  - On the Maps tab, there may be traffic and weather maps.

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