From a3c2a2b86c28f85211731e7ffaf2ccb0ed2850e6 Mon Sep 17 00:00:00 2001
From: Klaus Goger <klaus.goger@theobroma-systems.com>
Date: Thu, 30 Jul 2015 21:39:18 +0200
Subject: Add Cortex M0 Firmware and linux helper tool

 * Firmware with fan controller, RTC and watchdog functionality
 * Linux shell script to reset and flash the MCU

Signed-off-by: Klaus Goger <klaus.goger@theobroma-systems.com>
---
 cortex-m0/README.rst    |  27 +++++++++++++++
 cortex-m0/cortex-m0.bin | Bin 0 -> 20692 bytes
 cortex-m0/cortex-m0.sh  |  88 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 115 insertions(+)
 create mode 100644 cortex-m0/README.rst
 create mode 100755 cortex-m0/cortex-m0.bin
 create mode 100755 cortex-m0/cortex-m0.sh

diff --git a/cortex-m0/README.rst b/cortex-m0/README.rst
new file mode 100644
index 0000000..570af2a
--- /dev/null
+++ b/cortex-m0/README.rst
@@ -0,0 +1,27 @@
+==============================================================
+Tools and Firmware for the Cortex M0 Companion Microcontroller
+==============================================================
+
+- ``cortex-m0.bin`` - firmware for the companion mcu
+- ``cortex-m0.sh``  - tool to reset and flash the companion mcu
+
+cortex-m0.sh
+------------
+
+Usage:
+######
+
+--reset               resets the companion mcu
+--dfu                 enables the dfu mode
+--disable             enables the mcu reset line to keep it in reset
+--flash firmware      flash the mcu with given firmware
+
+cortex-m0.bin
+-------------
+
+Features:
+#########
+
+- emulates an TI AMC6821 fan controller on I2C address 0x18
+- emulates an Interil ISL1208 RTC on I2C address 0x6f
+- external watchdog form the Qseven watchdog pins
diff --git a/cortex-m0/cortex-m0.bin b/cortex-m0/cortex-m0.bin
new file mode 100755
index 0000000..e11f84b
Binary files /dev/null and b/cortex-m0/cortex-m0.bin differ
diff --git a/cortex-m0/cortex-m0.sh b/cortex-m0/cortex-m0.sh
new file mode 100755
index 0000000..d85d96f
--- /dev/null
+++ b/cortex-m0/cortex-m0.sh
@@ -0,0 +1,88 @@
+#!/bin/sh
+
+RESET_PIN=90
+BOOT0_PIN=67
+
+SYSFSPATH=/sys/class/gpio
+
+die() {
+	echo "$*" 1>&2
+	exit 1
+}
+
+usage() {
+	echo "Usage: $0 [--reset|--dfu|--disable|--flash <firmware>]"
+	echo "  --reset            - resets the Cortex M0"
+	echo "  --dfu              - enables DFU loader"
+	echo "  --disable          - keep Cortex M0 in reset"
+	echo "  --flash <firmware> - flash the given firmware"
+
+	exit 1
+}
+
+gpiosetup() {
+	for PIN in $RESET_PIN $BOOT0_PIN 
+	do
+		if [ ! -d ${SYSFSPATH}/gpio${PIN} ] ; then
+			echo $PIN > ${SYSFSPATH}/export
+			echo out > ${SYSFSPATH}/gpio${PIN}/direction
+		fi
+	done
+}
+
+reset_stm32() {
+	echo 0 >  ${SYSFSPATH}/gpio${RESET_PIN}/value
+	echo 0 >  ${SYSFSPATH}/gpio${BOOT0_PIN}/value
+	sleep 0.1
+	echo 1 >  ${SYSFSPATH}/gpio${RESET_PIN}/value
+}
+
+enable_dfu() {
+	gpiosetup
+	echo 0 >  ${SYSFSPATH}/gpio${RESET_PIN}/value
+	echo 1 >  ${SYSFSPATH}/gpio${BOOT0_PIN}/value
+	sleep 0.1
+	echo 1 >  ${SYSFSPATH}/gpio${RESET_PIN}/value
+}
+
+case "$1" in
+--reset) echo "reseting Cortex M0"
+	gpiosetup
+	reset_stm32
+    ;;
+--dfu) echo "enabling DFU loader"
+	gpiosetup
+	enable_dfu
+    ;;
+--disable) echo "disabling Cortex M0"
+	gpiosetup
+	echo 0 >  ${SYSFSPATH}/gpio${RESET_PIN}/value
+    ;;
+--flash) 
+	[ $# -eq 2 ] || usage
+	command -v dfu-util >/dev/null 2>&1 || die "dfu-util needed but not found"
+	[ -f "$2" ] || die "flash file does not exist"
+	echo "flashing Cortex M0"
+	gpiosetup
+	enable_dfu
+	echo waiting for DFU loader
+	if [ command -v lsusb >/dev/null 2>&1 ]; then
+		while ! lsusb -d 0483:df11 > /dev/null
+		do
+			sleep .1
+			echo -n .
+		done
+		echo -e "\nfound"
+	else
+		sleep 5
+	fi
+	dfu-util -d 0483:df11 -a 0 -s 0x08000000 -D $2
+	reset_stm32
+    ;;
+--*) usage
+    ;;
+*) usage 
+    ;;
+esac
+
+exit 0
-- 
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