Added Ton's SMBus scripts

f31a10f9 · Peter Jansweijer · 10c82f69 · f31a10f9 · f31a10f9
Commit f31a10f9 authored May 15, 2020 by Peter Jansweijer
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notes.pdf sw/SMBus_reset/notes.pdf +0 -0

spec7_reset.sh sw/SMBus_reset/spec7_reset.sh +51 -0

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--- a/sw/SMBus_reset/notes.pdf
+++ b/sw/SMBus_reset/notes.pdf
--- a/sw/SMBus_reset/spec7_reset.sh
+++ b/sw/SMBus_reset/spec7_reset.sh
+#!/bin/sh
+# 
+# Script to reset the SPEC7 card via SMBus
+# Author <Ton Damen>tond@nikhef.nl
+# Date: 9 april 2020
+# Relies on the rpm package "i2c-tools"
+#
+
+which i2cdetect > /dev/null 2>&1
+
+if test $? -ne 0; then
+	echo "Missing i2c-utils"
+	exit
+fi
+
+if test $(id -u) -ne 0; then
+	echo "Need root privilege"
+	exit
+fi
+
+BUS=$(i2cdetect -l |  awk -e '/SMBus/ { print substr($1,5)  }')
+CHIP_ADDR=0x20
+CHIP_INPUT_REG=0
+CHIP_OUTPUT_REG=1
+CHIP_CONF_REG=3
+
+echo "Found SMBUS on bus $BUS"
+
+REG_VAL=$(i2cget -y $BUS $CHIP_ADDR $CHIP_INPUT_REG  2>/dev/null)
+
+if test -z $REG_VAL; then
+	echo "I2C on SPEC not present"
+	exit
+fi
+
+echo "Read value $REG_VAL on address 0 (expect 0xff)"
+
+echo "Issuing reset.."
+
+# set bit0 to output
+i2cset -r -y -m 1 $BUS $CHIP_ADDR $CHIP_CONF_REG 0
+# set bit0 to 0
+i2cset -r -y -m 1 $BUS $CHIP_ADDR $CHIP_OUTPUT_REG 0
+# set bit0 to 1
+i2cset -r -y -m 1 $BUS $CHIP_ADDR $CHIP_OUTPUT_REG 1
+
+if test $? -eq 0; then
+	echo "Success"
+else
+	echo "Failed"
+fi