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iCE40 SPI Configuration
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#!/bin/bash | |
# A script to configure Lattice iCE40 FPGA by SPI from Raspberry Pi | |
# | |
# Copyright (C) 2015 Jan Marjanovic <[email protected]> | |
# | |
# This program is free software: you can redistribute it and/or modify | |
# it under the terms of the GNU General Public License as published by | |
# the Free Software Foundation, either version 3 of the License, or | |
# (at your option) any later version. | |
# | |
# This program is distributed in the hope that it will be useful, | |
# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
# GNU General Public License for more details. | |
# | |
# You should have received a copy of the GNU General Public License | |
# along with this program. If not, see <http://www.gnu.org/licenses/>. | |
echo "" | |
if [ $# -ne 1 ]; then | |
echo "Usage: $0 FPGA-bin-file " | |
exit 1 | |
fi | |
if [ $EUID -ne 0 ]; then | |
echo "This script must be run as root" 1>&2 | |
exit 1 | |
fi | |
if [ ! -d /sys/class/gpio/gpio25 ]; then | |
echo "GPIO 25 not exported, trying to export..." | |
echo 25 > /sys/class/gpio/export | |
if [ ! -d /sys/class/gpio/gpio25 ]; then | |
echo "ERROR: directory /sys/class/gpio/gpio25 does not exist" | |
exit 1 | |
fi | |
else | |
echo "OK: GPIO 25 exported" | |
fi | |
echo "" | |
if [ -e /dev/spidev0.0 ]; then | |
echo "OK: SPI driver loaded" | |
else | |
echo "spidev does not exist" | |
lsmod | grep spi_bcm2708 >& /dev/null | |
if [ $? -ne 0 ]; then | |
echo "SPI driver not loaded, try to load it..." | |
modprobe spi_bcm2708 | |
if [ $? -eq 0 ]; then | |
echo "OK: SPI driver loaded" | |
else | |
echo "Could not load SPI driver" | |
exit 1 | |
fi | |
fi | |
fi | |
echo "" | |
echo "Changing direction to out" | |
echo out > /sys/class/gpio/gpio25/direction | |
cat /sys/class/gpio/gpio25/direction | |
echo "Setting output to low" | |
echo 0 > /sys/class/gpio/gpio25/value | |
cat /sys/class/gpio/gpio25/value | |
echo "" | |
echo "Please power cycle the iCE40 FPGA board" | |
echo "Press any key..." | |
read | |
echo "Continuing with configuration procedure" | |
dd if=$1 of=/dev/spidev0.0 | |
echo -e "\x0\x0\x0\x0\x0\x0\x0" > /dev/spidev0.0 | |
echo "Setting output to high" | |
echo 1 > /sys/class/gpio/gpio25/value | |
cat /sys/class/gpio/gpio25/value |
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