#!/bin/bash

# SARPi Project - Slackware Linux on a Raspberry Pi [sarpi.penthux.net]
#
# cpu_status.sh
#
# Raspberry Pi CPU clock frequency and thermal status.
# This script outputs the current status of the CPU clock speed (MHz)
# and core temperature (Celsius) for monitoring or testing purposes
# while under load or idle. Easily modified to suit other ARM devices.
#
# Usage -
# Default command:   ./cpu_status.sh           # run once, no refresh
# Default refresh:   watch ./cpu_status.sh     # 2 seconds refresh
# Custom refresh:    watch -n<number of seconds or 0> ./cpu_status.sh
# With highlights:   watch -d -n0 ./cpu_status.sh
# Perm highlights:   watch -d=cumulative -n0 ./cpu_status.sh
#
# Exaga : 15 Jan 2018 - progenitor
#         29 Jun 2019 - update rpi model & hw revision
#         03 Jul 2019 - update quad-core cpu and system uptime
#         18 Jul 2019 - update cpu-id and cpufreq-info
#         27 Jan 2020 - code revision and update
#         07 Sep 2020 - code clean-up
#         16 Mar 2026 - code revision to auto discover cores
#

set -u
IFS=$'\n\t'

# Output SARPi marque
echo -e "SARPi Project - sarpi.penthux.net\nSlackware $(uname -m) SoC [MHz & Thermal] Stats\n"

# Get RPi model, hardware revision, and CPU
RPiModel=$(tr -d '\0' </proc/device-tree/model)
RPiHWRev=$(awk '/Revision/ {print $3}' /proc/cpuinfo)
RPiCPUiD=$(awk '/Serial/ {print $3}' /proc/cpuinfo)

cpu_status () {

echo "Device : ${RPiModel}"
echo "HW Rev : ${RPiHWRev}"
echo -e "CPU ID : ${RPiCPUiD}\n"

# Output system uptime
echo -e "Uptime : $(uptime)\n"

# Output CPU clock status
echo "CPU Freq Status [clock speed]"

for cpu in /sys/devices/system/cpu/cpu[0-9]*; do
    if [ -f "$cpu/cpufreq/cpuinfo_cur_freq" ]; then
        freq=$(<"$cpu/cpufreq/cpuinfo_cur_freq")
        core=${cpu##*cpu}
        echo "CPU ${core} Freq : $((freq/1000)) MHz"
    fi
done

# Display CPU freq usage stats
if command -v cpufreq-info >/dev/null 2>&1; then
    echo
    cpufreq-info | grep -m1 'cpufreq stats:' | cut -d'(' -f1 | cut -d' ' -f3-12
    echo
fi

# CPU thermal status
echo "CPU Thermal Status"

cpuTemp=$(</sys/class/thermal/thermal_zone0/temp)
printf "CPU temp : %d.%d'C\n" $((cpuTemp/1000)) $(((cpuTemp%1000)/100))

echo -e "\n[Press CTRL+C to exit.]\n"

}

cpu_status

exit 0

# EOF<*>