From e899245018a570900dd79fb775072558f94d2c94 Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Wed, 5 Jan 2022 13:41:51 +0100
Subject: add system_usage.sh script

system_usage.sh outputs the systems performance data to
serial port to be displayed on analog instruments
---
 system_usage.sh | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100755 system_usage.sh

diff --git a/system_usage.sh b/system_usage.sh
new file mode 100755
index 0000000..d4d3124
--- /dev/null
+++ b/system_usage.sh
@@ -0,0 +1,91 @@
+#!/bin/bash
+
+#
+# system_usage.sh
+# (c) 2022 Jonas Gunz <himself@jonasgunz.de>
+# License: All rights reserved.
+#
+
+# USAGE:
+# ./system_usage.sh [TTY [BAUD]]
+
+readonly TTY=${1:-/dev/ttyUSB0}
+readonly BAUD=${2:-9600}
+
+readonly NUMCPU="$(nproc --all)" #"$(grep -c ^processor /proc/cpuinfo)"
+
+readonly PWM_CPU=0
+readonly PWM_RAM=1
+readonly PWM_TMP=2
+
+echo "Trying to set $TTY to $BAUD"
+stty -F "$TTY" "$BAUD" -echo || exit 1
+echo OK!
+
+function cpu_usage() {
+	read -r LOAD CATCH < /proc/loadavg
+	
+	local FLOATLOAD
+	FLOATLOAD=$(echo "($LOAD/$NUMCPU)*100" | bc -l)
+	local CPU_PERCENT="${FLOATLOAD%%.*}"
+	
+	echo "$CPU_PERCENT"
+
+	unset LOAD CATCH
+}
+
+function ram_usage() {
+	local TOTAL=0
+	local USED=0
+	local AVAIL=0
+	local PERCENT_USED PERCENT_USED_INT
+	
+	while read -r line; do
+		ARR=( $line ) # Splitting is intended!
+		[ "${ARR[0]}" != "Mem:" ] && continue
+	
+		TOTAL=${ARR[1]}
+		AVAIL=${ARR[6]}
+		USED=$((TOTAL-AVAIL))
+	
+		break
+	done <<< "$(free | tail -n -2)"
+	
+	PERCENT_USED=$(echo "scale=4; $USED / $TOTAL * 100 " | bc -l)
+	PERCENT_USED=${PERCENT_USED%00}
+	PERCENT_USED_INT=${PERCENT_USED%.*}
+
+	echo "$PERCENT_USED_INT"
+}
+
+function cpu_temp() {
+	local DATA SUM VAL
+	DATA=( $(sensors | \
+		grep "^Core" | \
+		sed -n "s|^Core\s[0-9]\+:\s\++\([0-9]\+\.[0-9]\+\).*$|\1|p" ) )
+
+	SUM=0
+	for (( i=0; i<${#DATA[@]}; i++ )); do
+		VAL=${DATA[$i]%.*}
+		SUM=$((SUM+VAL))
+	done
+
+	echo $((SUM/${#DATA[@]}))
+}
+
+# $1: PWM NUM
+# $2: Dutycycle
+function pwm_fade() {
+	local DUTY HEX
+	DUTY=$(echo "($2 * 255)/100" | bc)
+	HEX=$(printf "%x" "$DUTY")
+	echo "f$1$HEX" > "$TTY"
+}
+
+while true; do
+	pwm_fade $PWM_CPU "$(cpu_usage)"
+	pwm_fade $PWM_RAM "$(ram_usage)"
+	pwm_fade $PWM_TMP "$(cpu_temp)"
+
+	sleep 10
+done
-- 
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