RASCSI/python/loopback_test/test.py

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#!/usr/bin/env python3
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# 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
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# 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
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# 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
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# 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},
]
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# 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'
}
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# 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("")
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# Set transceivers IC1 and IC2 to OUTPUT
def set_dtd_out():
gpio.output(rascsi_dtd_gpio,gpio.LOW)
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# Set transceivers IC1 and IC2 to INPUT
def set_dtd_in():
gpio.output(rascsi_dtd_gpio,gpio.HIGH)
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# Set transceiver IC4 to OUTPUT
def set_ind_out():
gpio.output(rascsi_ind_gpio,gpio.HIGH)
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# Set transceiver IC4 to INPUT
def set_ind_in():
gpio.output(rascsi_ind_gpio,gpio.LOW)
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# Set transceiver IC3 to OUTPUT
def set_tad_out():
gpio.output(rascsi_tad_gpio,gpio.HIGH)
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# Set transceiver IC3 to INPUT
def set_tad_in():
gpio.output(rascsi_tad_gpio,gpio.LOW)
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# 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()
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# 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
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# 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)
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# Main functions for running the actual test.
if __name__ == '__main__':
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# setup the GPIOs
setup()
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# Test each SCSI signal in the gpio_map
for cur_gpio in gpio_map:
test_gpio_pin(cur_gpio)
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# Print the test results
if(err_count == 0):
print("-------- Test PASSED --------")
else:
print("!!!!!!!! Test FAILED !!!!!!!!")
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print("Total errors: " + str(err_count))
gpio.cleanup()