Measure Raspberry Pi CPU / GPU / Core / SD clock speeds and check whether you are undervolted

measurepi.sh

#!/bin/bash
# This bash script outputs the status of your Pi and checks whether you are being throttled for undervoltage and gives you your temperature
# Article and discussion at https://jamesachambers.com/measure-raspberry-pi-undervoltage-true-clock-speeds/
# Author James A Chambers 6-6-17
# updated throttle reason codes by tmuka 2021-10

# Output current configuration
vcgencmd get_config int | egrep "(arm|core|gpu|sdram)_freq|over_volt"

# Measure clock speeds
# for src in arm core h264 isp v3d; do echo -e "$src:\t$(vcgencmd measure_clock $src)"; done
# output human readable cpu speeds in GHz if you want raw data, use the previous line instead.
for src in arm core h264 isp v3d; do echo -e "$src:\t$(vcgencmd measure_clock $src  | awk ' BEGIN { FS="=" } ; { printf("%.1fGHz\n", $2 / 1000000000) } ')"; done

# Measure Volts
for id in core sdram_c sdram_i sdram_p ; do echo -e "$id:\t$(vcgencmd measure_volts $id)"; done

# Measure Temperature
vcgencmd measure_temp

# See if we are being throttled
throttled="$(vcgencmd get_throttled)"
echo -e "$throttled"
if [[ $throttled != "throttled=0" ]]; then
        # echo "WARNING:  You are/have been throttled."
        # updated warnings details based on https://raspberrypi.stackexchange.com/a/91433
        # https://forum.libreelec.tv/thread/17860-how-to-interpret-rpi-vcgencmd-get-throttled/
        # NOTE: The script is slightly out of date as bits 3 and 19 have now been added since the page was published. So
        # 0x0 means nothing wrong
        # 0x50000 means throttled has occurred since the last reboot.
        # 0x50005 means you are currently under-voltage and throttled.
        #
        #       Bit Hex value   Meaning
        #       0          1    Under-voltage detected
        #       1          2    Arm frequency capped
        #       2          4    Currently throttled
        #       3          8    Soft temperature limit active
        #       16     10000    Under-voltage has occurred
        #       17     20000    Arm frequency capping has occurred
        #       18     40000    Throttling has occurred
        #       19     80000    Soft temperature limit has occurred
        case $throttled in
                "throttled=0x0")
                        echo "0x0       nothing wrong"
                        ;;
                "throttled=0x50000")
                        echo "0x50000   throttling occurred since last reboot"
                        ;;
                "throttled=0x50005")
                        echo "0x50005   currently under voltage and throttled."
                        ;;
                "throttled=0x1")
                        echo "0          1    Under-voltage detected"
                        ;;
                "throttled=0x2")
                        echo "1          2    Arm frequency capped"
                        ;;
                "throttled=0x4")
                        echo "2          4    Currently throttled"
                        ;;
                "throttled=0x8")
                        echo "3          8    Soft temperature limit active";
                        ;;
                "throttled=0x10000")
                        echo "16     10000    Under-voltage has occurred"
                        ;;
                "throttled=0x20000")
                        echo "17     20000    Arm frequency capping has occurred"
                        ;;
                "throttled=0x40000")
                        echo "18     40000    Throttling has occurred"
                        ;;
                "throttled=0x80000")
                        echo "19     80000    Soft temperature limit has occurred"
                        ;;
        esac
fi

added bits 3 and 19 data from https://forum.libreelec.tv/thread/17860-how-to-interpret-rpi-vcgencmd-get-throttled/

Hello.
Nice script, but I got error on line 24, because there are double brackets. After change to single bracket it's OK.

Also shouldn't be the result determined by bit mask, not only by comparison?

Hi @Benik3 the double brackets worked okay for me in Bash, maybe you're running a different shell? Yes, a bitmask would be better to detect when more than one of the conditions has occurred. I'd welcome your input on how to achieve that.

I'm running RPi Zero 2 W with latest Raspbian lite. I was connected with putty and run the bash simply by sh measurepi.sh
Maybe I will look on the bit mask, I'm new in RPi and bash, so I'm learning it just now :)