mirror of
https://github.com/akuker/RASCSI.git
synced 2024-12-01 13:51:43 +00:00
262 lines
9.8 KiB
Python
262 lines
9.8 KiB
Python
#!/usr/bin/env python3
|
|
# BSD 3-Clause License
|
|
#
|
|
# Copyright (c) 2021, akuker
|
|
# All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are met:
|
|
#
|
|
# 1. Redistributions of source code must retain the above copyright notice, this
|
|
# list of conditions and the following disclaimer.
|
|
#
|
|
# 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
# this list of conditions and the following disclaimer in the documentation
|
|
# and/or other materials provided with the distribution.
|
|
#
|
|
# 3. Neither the name of the copyright holder nor the names of its
|
|
# contributors may be used to endorse or promote products derived from
|
|
# this software without specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
import RPi.GPIO as gpio
|
|
import time
|
|
|
|
pin_settle_delay = 0.01
|
|
|
|
err_count = 0
|
|
|
|
# Define constants for each of the SCSI signals, based upon their
|
|
# raspberry pi pin number (since we're using BOARD mode of RPi.GPIO)
|
|
scsi_d0_gpio = 19
|
|
scsi_d1_gpio = 23
|
|
scsi_d2_gpio = 32
|
|
scsi_d3_gpio = 33
|
|
scsi_d4_gpio = 8
|
|
scsi_d5_gpio = 10
|
|
scsi_d6_gpio = 36
|
|
scsi_d7_gpio = 11
|
|
scsi_dp_gpio = 12
|
|
scsi_atn_gpio = 35
|
|
scsi_rst_gpio = 38
|
|
scsi_ack_gpio = 40
|
|
scsi_req_gpio = 15
|
|
scsi_msg_gpio = 16
|
|
scsi_cd_gpio = 18
|
|
scsi_io_gpio = 22
|
|
scsi_bsy_gpio = 37
|
|
scsi_sel_gpio = 13
|
|
|
|
# Pin numbers of the direction controllers of the RaSCSI board
|
|
rascsi_ind_gpio = 31
|
|
rascsi_tad_gpio = 26
|
|
rascsi_dtd_gpio = 24
|
|
rascsi_none = -1
|
|
|
|
# Matrix showing all of the SCSI signals, along what signal they're looped back to.
|
|
# dir_ctrl indicates which direction control pin is associated with that output
|
|
gpio_map = [
|
|
{ 'gpio_num': scsi_d0_gpio, 'attached_to': scsi_ack_gpio, 'dir_ctrl': rascsi_dtd_gpio},
|
|
{ 'gpio_num': scsi_d1_gpio, 'attached_to': scsi_sel_gpio, 'dir_ctrl': rascsi_dtd_gpio},
|
|
{ 'gpio_num': scsi_d2_gpio, 'attached_to': scsi_atn_gpio, 'dir_ctrl': rascsi_dtd_gpio},
|
|
{ 'gpio_num': scsi_d3_gpio, 'attached_to': scsi_rst_gpio, 'dir_ctrl': rascsi_dtd_gpio},
|
|
{ 'gpio_num': scsi_d4_gpio, 'attached_to': scsi_cd_gpio, 'dir_ctrl': rascsi_dtd_gpio},
|
|
{ 'gpio_num': scsi_d5_gpio, 'attached_to': scsi_io_gpio, 'dir_ctrl': rascsi_dtd_gpio},
|
|
{ 'gpio_num': scsi_d6_gpio, 'attached_to': scsi_msg_gpio, 'dir_ctrl': rascsi_dtd_gpio},
|
|
{ 'gpio_num': scsi_d7_gpio, 'attached_to': scsi_req_gpio, 'dir_ctrl': rascsi_dtd_gpio},
|
|
{ 'gpio_num': scsi_dp_gpio, 'attached_to': scsi_bsy_gpio, 'dir_ctrl': rascsi_dtd_gpio},
|
|
{ 'gpio_num': scsi_atn_gpio, 'attached_to': scsi_d2_gpio, 'dir_ctrl': rascsi_ind_gpio},
|
|
{ 'gpio_num': scsi_rst_gpio, 'attached_to': scsi_d3_gpio, 'dir_ctrl': rascsi_ind_gpio},
|
|
{ 'gpio_num': scsi_ack_gpio, 'attached_to': scsi_d0_gpio, 'dir_ctrl': rascsi_ind_gpio},
|
|
{ 'gpio_num': scsi_req_gpio, 'attached_to': scsi_d7_gpio, 'dir_ctrl': rascsi_tad_gpio},
|
|
{ 'gpio_num': scsi_msg_gpio, 'attached_to': scsi_d6_gpio, 'dir_ctrl': rascsi_tad_gpio},
|
|
{ 'gpio_num': scsi_cd_gpio, 'attached_to': scsi_d4_gpio, 'dir_ctrl': rascsi_tad_gpio},
|
|
{ 'gpio_num': scsi_io_gpio, 'attached_to': scsi_d5_gpio, 'dir_ctrl': rascsi_tad_gpio},
|
|
{ 'gpio_num': scsi_bsy_gpio, 'attached_to': scsi_dp_gpio, 'dir_ctrl': rascsi_tad_gpio},
|
|
{ 'gpio_num': scsi_sel_gpio, 'attached_to': scsi_d1_gpio, 'dir_ctrl': rascsi_ind_gpio},
|
|
]
|
|
|
|
# List of all of the SCSI signals that is also a dictionary to their human readable name
|
|
scsi_signals = {
|
|
scsi_d0_gpio: 'D0',
|
|
scsi_d1_gpio: 'D1',
|
|
scsi_d2_gpio: 'D2',
|
|
scsi_d3_gpio: 'D3',
|
|
scsi_d4_gpio: 'D4',
|
|
scsi_d5_gpio: 'D5',
|
|
scsi_d6_gpio: 'D6',
|
|
scsi_d7_gpio: 'D7',
|
|
scsi_dp_gpio: 'DP',
|
|
scsi_atn_gpio: 'ATN',
|
|
scsi_rst_gpio: 'RST',
|
|
scsi_ack_gpio: 'ACK',
|
|
scsi_req_gpio: 'REQ',
|
|
scsi_msg_gpio: 'MSG',
|
|
scsi_cd_gpio: 'CD',
|
|
scsi_io_gpio: 'IO',
|
|
scsi_bsy_gpio: 'BSY',
|
|
scsi_sel_gpio: 'SEL'
|
|
}
|
|
|
|
# Debug function that just dumps the status of all of the scsi signals to the console
|
|
def print_all():
|
|
for cur_gpio in gpio_map:
|
|
print(cur_gpio['name']+"="+str(gpio.input(cur_gpio['gpio_num'])) + " ", end='', flush=True)
|
|
print("")
|
|
|
|
# Set transceivers IC1 and IC2 to OUTPUT
|
|
def set_dtd_out():
|
|
gpio.output(rascsi_dtd_gpio,gpio.LOW)
|
|
|
|
# Set transceivers IC1 and IC2 to INPUT
|
|
def set_dtd_in():
|
|
gpio.output(rascsi_dtd_gpio,gpio.HIGH)
|
|
|
|
# Set transceiver IC4 to OUTPUT
|
|
def set_ind_out():
|
|
gpio.output(rascsi_ind_gpio,gpio.HIGH)
|
|
|
|
# Set transceiver IC4 to INPUT
|
|
def set_ind_in():
|
|
gpio.output(rascsi_ind_gpio,gpio.LOW)
|
|
|
|
# Set transceiver IC3 to OUTPUT
|
|
def set_tad_out():
|
|
gpio.output(rascsi_tad_gpio,gpio.HIGH)
|
|
|
|
# Set transceiver IC3 to INPUT
|
|
def set_tad_in():
|
|
gpio.output(rascsi_tad_gpio,gpio.LOW)
|
|
|
|
# Set the specified transciever to an OUTPUT. All of the other transceivers
|
|
# will be set to inputs. If a non-existent direction gpio is specified, this
|
|
# will set all of the transceivers to inputs.
|
|
def set_output_channel(out_gpio):
|
|
if(out_gpio == rascsi_tad_gpio):
|
|
set_tad_out()
|
|
else:
|
|
set_tad_in()
|
|
if(out_gpio == rascsi_dtd_gpio):
|
|
set_dtd_out()
|
|
else:
|
|
set_dtd_in()
|
|
if(out_gpio == rascsi_ind_gpio):
|
|
set_ind_out()
|
|
else:
|
|
set_ind_in()
|
|
|
|
|
|
# Main test procedure. This will execute for each of the SCSI pins to make sure its connected
|
|
# properly.
|
|
def test_gpio_pin(gpio_rec):
|
|
global err_count
|
|
|
|
set_output_channel(gpio_rec['dir_ctrl'])
|
|
|
|
############################################
|
|
# set the test gpio low
|
|
gpio.output(gpio_rec['gpio_num'], gpio.LOW)
|
|
|
|
time.sleep(pin_settle_delay)
|
|
|
|
# loop through all of the gpios
|
|
for cur_gpio in scsi_signals:
|
|
# all of the gpios should be high except for the test gpio and the connected gpio
|
|
cur_val = gpio.input(cur_gpio)
|
|
if( cur_gpio == gpio_rec['gpio_num']):
|
|
if(cur_val != gpio.LOW):
|
|
print("Error: Test commanded GPIO " + scsi_signals[gpio_rec['gpio_num']] + " to be low, but it did not respond")
|
|
err_count = err_count+1
|
|
elif (cur_gpio == gpio_rec['attached_to']):
|
|
if(cur_val != gpio.LOW):
|
|
print("Error: GPIO " + scsi_signals[gpio_rec['gpio_num']] + " should drive " + scsi_signals[gpio_rec['attached_to']] + " low, but did not")
|
|
err_count = err_count+1
|
|
else:
|
|
if(cur_val != gpio.HIGH):
|
|
print("Error: GPIO " + scsi_signals[gpio_rec['gpio_num']] + " incorrectly pulled " + scsi_signals[cur_gpio] + " LOW, when it shouldn't have")
|
|
err_count = err_count+1
|
|
|
|
############################################
|
|
# set the transceivers to input
|
|
set_output_channel(rascsi_none)
|
|
|
|
time.sleep(pin_settle_delay)
|
|
|
|
# loop through all of the gpios
|
|
for cur_gpio in scsi_signals:
|
|
# all of the gpios should be high except for the test gpio
|
|
cur_val = gpio.input(cur_gpio)
|
|
if( cur_gpio == gpio_rec['gpio_num']):
|
|
if(cur_val != gpio.LOW):
|
|
print("Error: Test commanded GPIO " + scsi_signals[gpio_rec['gpio_num']] + " to be low, but it did not respond")
|
|
err_count = err_count+1
|
|
else:
|
|
if(cur_val != gpio.HIGH):
|
|
print("Error: GPIO " + scsi_signals[gpio_rec['gpio_num']] + " incorrectly pulled " + scsi_signals[cur_gpio] + " LOW, when it shouldn't have")
|
|
err_count = err_count+1
|
|
|
|
|
|
# Set the transceiver back to output
|
|
set_output_channel(gpio_rec['dir_ctrl'])
|
|
|
|
#############################################
|
|
# set the test gpio high
|
|
gpio.output(gpio_rec['gpio_num'], gpio.HIGH)
|
|
|
|
time.sleep(pin_settle_delay)
|
|
|
|
# loop through all of the gpios
|
|
for cur_gpio in scsi_signals:
|
|
# all of the gpios should be high
|
|
cur_val = gpio.input(cur_gpio)
|
|
if( cur_gpio == gpio_rec['gpio_num']):
|
|
if(cur_val != gpio.HIGH):
|
|
print("Error: Test commanded GPIO " + scsi_signals[gpio_rec['gpio_num']] + " to be high, but it did not respond")
|
|
err_count = err_count+1
|
|
else:
|
|
if(cur_val != gpio.HIGH):
|
|
print("Error: GPIO " + scsi_signals[gpio_rec['gpio_num']] + " incorrectly pulled " + scsi_signals[cur_gpio] + " LOW, when it shouldn't have")
|
|
err_count = err_count+1
|
|
|
|
|
|
# Initialize the GPIO library, set all of the gpios associated with SCSI signals to outputs and set
|
|
# all of the direction control gpios to outputs
|
|
def setup():
|
|
gpio.setmode(gpio.BOARD)
|
|
gpio.setwarnings(False)
|
|
for cur_gpio in gpio_map:
|
|
gpio.setup(cur_gpio['gpio_num'], gpio.OUT, initial=gpio.HIGH)
|
|
|
|
# Setup direction control
|
|
gpio.setup(rascsi_ind_gpio, gpio.OUT)
|
|
gpio.setup(rascsi_tad_gpio, gpio.OUT)
|
|
gpio.setup(rascsi_dtd_gpio, gpio.OUT)
|
|
|
|
|
|
# Main functions for running the actual test.
|
|
if __name__ == '__main__':
|
|
# setup the GPIOs
|
|
setup()
|
|
# Test each SCSI signal in the gpio_map
|
|
for cur_gpio in gpio_map:
|
|
test_gpio_pin(cur_gpio)
|
|
|
|
# Print the test results
|
|
if(err_count == 0):
|
|
print("-------- Test PASSED --------")
|
|
else:
|
|
print("!!!!!!!! Test FAILED !!!!!!!!")
|
|
print("Total errors: " + str(err_count))
|
|
|
|
gpio.cleanup()
|