#!/bin/bash
# Copy this into /usr/local/bin/pistat
# This version will show Pi RAM size and will work in Raspbian also
# sample output:  Raspberry Pi 4 Model B 1.2 4GB
if [[ $( whoami ) == "root" ]]; then
        VCGENCMD="/usr/bin/vcgencmd"
else
        VCGENCMD="sudo /usr/bin/vcgencmd"
fi

if [ -t 1 ]; then
        color_comment=$(echo -e '\e[1;30m')
        color_value=$(echo -e '\e[1;35m')
        color_ok=$(echo -e '\e[1;32m')
        color_fail=$(echo -e '\e[1;31m')
        color_reset=$(echo -e '\e[0m')
else
        color_comment=""
        color_value=""
        color_ok=""
        color_fail=""
        color_reset=""
fi
no="${color_ok}no${color_reset}"
yes="${color_fail}yes${color_reset}"

# code section to get Pi RAM size
RAMGB=$( $VCGENCMD get_config total_mem | awk -F= '{NUM = $2} END { if ( NUM < 1024 ) print NUM "MB"; else print (NUM / 1024) "GB"; }' )
if [ -f /proc/device-tree/model ]; then
  echo "${color_reset}# $(tr -d '\0' < /proc/device-tree/model) ${RAMGB}${color_reset}"
else
  RAM=$( echo "( $( free -m | grep Mem: | awk '{print $2}' ) + 340 ) / 1024" | bc )
  TMPFILE="/tmp/dmidecode.system"; rm -f $TMPFILE
  dmidecode -t system > $TMPFILE
  echo "${color_reset}# $(grep -i version $TMPFILE | cut -d':' -f2 | sed 's/^ //g') $(grep Product $TMPFILE | cut -d: -f2 | cut -d\( -f1 | sed 's/^ //g') ${RAM}GB${color_reset}"
fi

if [ -e /proc/device-tree/serial-number ]; then
  echo "${color_reset}Serial number: $(tr -d '\0' < /proc/device-tree/serial-number) ${color_reset}"
fi

echo
if [ -e /sys/class/thermal/thermal_zone0/temp ]; then
  echo "CPU temp: ${color_value}$(echo "scale=2; $(</sys/class/thermal/thermal_zone0/temp) / 1000" | bc -l)'C${color_reset}"
  gpu_temp=$($VCGENCMD measure_temp | cut -d'=' -f2 | cut -d"'" -f1 )
else
  CPUTEMP=$(sensors 2> /dev/null | egrep -A 2 'coretemp|k10temp' | egrep '^temp|^Core' | awk '{print $2}' | sed -e 's/°C//g' -e 's/+//g')
  echo "CPU temp: ${color_value}${CPUTEMP}'C${color_reset}"
  gpu_temp=$(sensors 2> /dev/null | grep -A 2 radeon | grep ^temp | awk '{print $2}' | sed -e 's/°C//g' -e 's/+//g')
fi
echo "GPU temp: ${color_value}${gpu_temp}'C${color_reset}"

flags=$($VCGENCMD get_throttled)
flags="${flags#*=}"
echo
echo "Throttled flags: ${color_value}${flags}${color_reset}"

echo
echo -n "Throttled now:  "
((($flags&0x4)!=0)) && echo "${yes}" || echo "${no}"

echo -n "Throttled past: "
((($flags&0x40000)!=0)) && echo "${yes}" || echo "${no}"

echo
echo -n "Undervoltage now:  "
((($flags&0x1)!=0)) && echo "${yes}" || echo "${no}"

echo -n "Undervoltage past: "
((($flags&0x10000)!=0)) && echo "${yes}" || echo "${no}"

echo
echo -n "Frequency capped now:  "
((($flags&0x2)!=0)) && echo "${yes}" || echo "${no}"

echo -n "Frequency capped past: "
((($flags&0x20000)!=0)) && echo "${yes}" || echo "${no}"

# =====
# https://stackoverflow.com/questions/13889659/read-a-file-by-bytes-in-bash
read8() {
        local _r8_var=${1:-OUTBIN} _r8_car LANG=C IFS=
        read -r -d '' -n 1 _r8_car
        printf -v $_r8_var %d "'"$_r8_car
}
read16() {
        local _r16_var=${1:-OUTBIN} _r16_lb _r16_hb
        read8  _r16_hb && read8  _r16_lb
        printf -v $_r16_var %d $(( _r16_hb<<8 | _r16_lb ))
}
read32() {
        local _r32_var=${1:-OUTBIN} _r32_lw _r32_hw
        read16 _r32_hw && read16 _r32_lw
        printf -v $_r32_var %d $(( _r32_hw<<16| _r32_lw ))
}

power=/proc/device-tree/chosen/power
if [ -f $power/max_current ]; then
        read32 value < $power/max_current
        echo
        echo "Max power supply current:" ${color_value}$(bc <<< "scale=1; $value / 1000")A${color_reset}
fi
if [ -f $power/usb_max_current_enable ]; then
        read32 value < $power/usb_max_current_enable
        echo "USB max current enabled: " ${color_value}$(test $value -ne 0 && echo yes || echo no)${color_reset}
fi
if [ -f $power/usb_over_current_detected ]; then
        read32 value < $power/usb_over_current_detected
        echo "USB overcurrent detected:" $(test $value -ne 0 && echo $yes || echo $no)
fi