Add Arcade Bonnet tester

arcade_bonnet_test.sh

@@ -0,0 +1,84 @@
+#/bin/bash
+
+# Arcade Bonnet troubleshooting tool. Checks whether prerequisite
+# config and tools are present, and runs live status of inputs.
+
+# Test if primary I2C enabled, offer help if needed
+if [ ! -c /dev/i2c-1 ]
+then
+	echo "I2C not present. Enable with:"
+	echo "  sudo raspi-config nonint do_i2c 0"
+	echo "or use raspi-config 'Interface Options' menu"
+	exit 1
+fi
+
+# Test if i2ctools installed, offer help if needed
+if ! type i2cset >/dev/null 2>&1
+then
+	echo "i2c-tools not present. Install with:"
+	echo "  sudo apt-get install i2c-tools"
+	exit 1
+fi
+
+# MCP23017 I2C address default is 0x20, Arcade Bonnet uses 0x26:
+MCP_ADDR=0x26
+
+# registers
+IODIRA=0x00
+IODIRB=0x01
+GPPUA=0x0C
+GPPUB=0x0D
+GPIOA=0x12
+GPIOB=0x13
+
+# set all pins to input
+i2cset -y 1 $MCP_ADDR $IODIRA 0xFF
+i2cset -y 1 $MCP_ADDR $IODIRB 0xFF
+
+# enable internal pull up on all pins
+i2cset -y 1 $MCP_ADDR $GPPUA 0xFF
+i2cset -y 1 $MCP_ADDR $GPPUB 0xFF
+
+# Display one input state, showing '*' if currently active
+disp() {
+	if [ $(($2 >> $3 & 0x01)) -ne 0 ]
+	then
+		echo " $1 :"
+	else
+		echo " $1 : *"
+	fi
+}
+
+# Test all Arcade Bonnet inputs in a loop
+while :
+do
+	# read pin state
+	GPA=$(i2cget -y 1 $MCP_ADDR $GPIOA)
+	GPB=$(i2cget -y 1 $MCP_ADDR $GPIOB)
+
+	# report
+	clear
+	echo "===== BUTTONS ====="
+	echo "raw value = $GPA"
+	disp "1A" $GPA 0
+	disp "1B" $GPA 1
+	disp "1C" $GPA 2
+	disp "1D" $GPA 3
+	disp "1E" $GPA 4
+	disp "1F" $GPA 5
+
+	echo "==== JOYSTICKS ===="
+	echo "raw value = $GPB"
+	echo "4-WAY"
+	disp "L" $GPB 3
+	disp "R" $GPB 2
+	disp "U" $GPB 1
+	disp "D" $GPB 0
+	echo "ANALOG"
+	disp "L" $GPB 5
+	disp "R" $GPB 4
+	disp "U" $GPB 6
+	disp "D" $GPB 7
+
+	echo "== CTRL-C TO EXIT =="
+done