Shell Scripts for the FMC RF boards

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Shell Scripts are scripts written for the shell (dash or bash or ash) of an operating system. To find out which shell, you are using, try something like:

This specifies any shell prompt running on the target

rgetz@pinky ~ $ which sh
/usr/bin/sh
rgetz@pinky ~ $ ls -l /usr/bin/sh
lrwxrwxrwx 1 root root 9 2009-05-13 20:39 /usr/bin/sh -> /bin/bash

OR

rgetz@pinky ~ $ ps -p $$
  PID TTY          TIME CMD
 1321 pts/0    00:00:00 bash

DDS passing by

#!/bin/sh

# find the DAC
for i in $(find /sys -name name)
do
  if [ "`cat $i`" = "cf-ad9122-core-lpc" ] ; then
     dac_path=$(echo $i | sed 's:/name$::')
  fi
done

#save the current settings
init=`cat $dac_path/out_altvoltage0_1A_frequency`

# Set DDSn_A
freq_A(){
  echo $1 > $dac_path/out_altvoltage0_1A_frequency
  echo $1 > $dac_path/out_altvoltage2_2A_frequency
}

# Set DDSn_B
freq_B(){
  echo $1 > $dac_path/out_altvoltage1_1B_frequency
  echo $1 > $dac_path/out_altvoltage3_2B_frequency
}

for i in 10 20 30 40 50 60 70 80 90 100 110
do
  freq_A `expr $i \\* 1000000`
  freq_B `expr \( 120 - $i \) \\* 1000000`
  sleep 1
done

freq_A $init
freq_B $init

Random data on the RF output

#!/bin/sh

# buffer size, let's use 512 samples, or 1024 bytes
buffer_size=1024

# find the DAC
for i in $(find /sys -name name)
do
  if [ "`cat $i`" = "cf-ad9122-core-lpc" ] ; then
     dac_path=$(echo $i | sed 's:/name$::')
  fi
done

# Get the associated dev file
dev=/dev/$(echo $dac_path |  awk -F "/" '{print $NF}')
if [ ! -c $dev ] ; then
  echo "Can't find device $dev"
  exit
fi

# set the buffer size
echo $buffer_size > $dac_path/buffer/length

# generate the random data, and give it to the DAC
dd if=/dev/urandom of=$dev bs=$buffer_size count=1

#enable things
echo 1 > $dac_path/buffer/enable

#Wait 5 seconds
sleep 5

#turn if off before we bring down everyone's WiFi
echo 0 > $dac_path/buffer/enable

Setting the amplitude

I don’t like remembering what 1/32 is, so I just use \(1/(2^n)\) . You just need to provide ‘n’.

#!/bin/sh

#check in the input
if [ $1 -le -1 ] ; then
  echo "input out of range, (needs to be 0-4)"
  exit
fi

if [ $1 -ge 5 ] ; then
  echo "input out of range (needs to be 0-4)"
  exit
fi

# find the DAC
for i in $(find /sys -name name 2>/dev/null)
do
  if [ "`cat $i`" = "cf-ad9122-core-lpc" ] ; then
     dac_path=$(echo $i | sed 's:/name$::')
  fi
done

echo $(echo "scale=4; 1 / ( 2 ^ $1 )" | bc) > $dac_path/out_altvoltage0_1A_scale
echo $(echo "scale=4; 1 / ( 2 ^ $1 )" | bc) > $dac_path/out_altvoltage1_1B_scale
echo $(echo "scale=4; 1 / ( 2 ^ $1 )" | bc) > $dac_path/out_altvoltage2_2A_scale
echo $(echo "scale=4; 1 / ( 2 ^ $1 )" | bc) > $dac_path/out_altvoltage3_2B_scale

echo -n "amplitude set to "
cat $dac_path/out_altvoltage0_1A_scale

Sweeping the Tx

#!/bin/bash

# find the TX LO generator
for i in $(find /sys -name name)
do
  if [ "`cat $i`" = "adf4351-tx-lpc" ] ; then
     tx_lo_path=$(echo $i | sed 's:/name$::')
  fi
done

if [ -z $tx_lo_path ] ; then
  echo "Can't find adf4351-tx-lpc"
  exit 1
fi

start=$1
end=$2
inc=$3
pause=$4

if [ -z $start ] ; then
  start=400
fi

if [ -z $end ] ; then
  end=4000
fi

if [ -z $inc ] ; then
  inc=5
fi

if [ -z $pause ] ; then
  pause=1
fi

freq_tx() {
  echo $1 > $tx_lo_path/out_altvoltage0_frequency
}

for (( i  = $start; $i <= $end; i+=$inc));
do
  echo $i
  freq_tx `expr $i \\* 1000000`
  sleep $pause
done