get_voltage.sh

#!/bin/sh

# from http://www.kkn.net/~n6tv/xadc.sh
# updated by Michael Hirsch, Ph.D.
#
# works in Ash (Red Pitaya ecosystem 0.95) and Bash (ecosystem 0.97)

# power supply voltages (predefined scaling)
# note that Ash doesn't have "array" so we use "set --"

# path to IIO device
XADC_PATH=/sys/bus/iio/devices/iio:device0

set -- "in_voltage0_vccint" \
           "in_voltage1_vccaux" \
           "in_voltage2_vccbram" \
           "in_voltage3_vccpint" \
           "in_voltage4_vccpaux" \
           "in_voltage5_vccoddr" \
           "in_voltage6_vrefp" \
           "in_voltage7_vrefn" 

for voltage do
  RAW=$(cat ${XADC_PATH}/${voltage}_raw)
  SCL=$(cat ${XADC_PATH}/${voltage}_scale)
   
  FORMULA="(${RAW}*${SCL})/1000.0"
  VAL=$(echo "scale=2;${FORMULA}" | bc)
  echo "${voltage} = ${VAL} V"
done

################################################################################
# input pin voltages (custom scaling)
# for in_voltage8          full range is 12.2  V
# for in_voltage9/10/11/12 full range is  7.01 V
################################################################################

# voltages=( "in_voltage8_vpvn" )
# 
# for voltage in "${voltages[@]}"
# do
#   RAW=`cat ${XADC_PATH}/${voltage}_raw`
#    
#   FORMULA="(${RAW}*12.2)/4095"
#   VAL=`echo "scale=2;${FORMULA}" | bc`
#   echo "${voltage} = ${VAL} V"
# done
# 
# 
# voltages=( "in_voltage9_vaux0" \
#            "in_voltage10_vaux1" \
#            "in_voltage11_vaux8" \
#            "in_voltage12_vaux9" )
# 
# for voltage in "${voltages[@]}"
# do
#   RAW=`cat ${XADC_PATH}/${voltage}_raw`
#    
#   FORMULA="(${RAW}*7.01)/4095"
#   VAL=`echo "scale=2;${FORMULA}" | bc`
#   echo "${voltage} = ${VAL} V"
# done