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RASCSI/python/loopback_test/test.py
Daniel Markstedt 52c2aa474f
Rebrand project to PiSCSI (#1016) 
* Rebrand project to PiSCSI
- rascsi ->piscsi
- rasctl -> scsictl
- rasdump -> scsidump
- ras* -> piscsi* (rasutil -> piscsi_util, etc.)

* Refined the formatting and wording of the app startup banner
* Kept some references to rascsi and rasctl where backwards compatibility is concerned
* Point to the new github repo URL

Co-authored-by: nucleogenic <nr@nucleogenic.com>
Co-authored-by: Uwe Seimet <Uwe.Seimet@seimet.de>
2022-12-05 09:58:23 -08:00

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#!/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 PiSCSI board
piscsi_ind_gpio = 31
piscsi_tad_gpio = 26
piscsi_dtd_gpio = 24
piscsi_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": piscsi_dtd_gpio,
},
{
"gpio_num": scsi_d1_gpio,
"attached_to": scsi_sel_gpio,
"dir_ctrl": piscsi_dtd_gpio,
},
{
"gpio_num": scsi_d2_gpio,
"attached_to": scsi_atn_gpio,
"dir_ctrl": piscsi_dtd_gpio,
},
{
"gpio_num": scsi_d3_gpio,
"attached_to": scsi_rst_gpio,
"dir_ctrl": piscsi_dtd_gpio,
},
{
"gpio_num": scsi_d4_gpio,
"attached_to": scsi_cd_gpio,
"dir_ctrl": piscsi_dtd_gpio,
},
{
"gpio_num": scsi_d5_gpio,
"attached_to": scsi_io_gpio,
"dir_ctrl": piscsi_dtd_gpio,
},
{
"gpio_num": scsi_d6_gpio,
"attached_to": scsi_msg_gpio,
"dir_ctrl": piscsi_dtd_gpio,
},
{
"gpio_num": scsi_d7_gpio,
"attached_to": scsi_req_gpio,
"dir_ctrl": piscsi_dtd_gpio,
},
{
"gpio_num": scsi_dp_gpio,
"attached_to": scsi_bsy_gpio,
"dir_ctrl": piscsi_dtd_gpio,
},
{
"gpio_num": scsi_atn_gpio,
"attached_to": scsi_d2_gpio,
"dir_ctrl": piscsi_ind_gpio,
},
{
"gpio_num": scsi_rst_gpio,
"attached_to": scsi_d3_gpio,
"dir_ctrl": piscsi_ind_gpio,
},
{
"gpio_num": scsi_ack_gpio,
"attached_to": scsi_d0_gpio,
"dir_ctrl": piscsi_ind_gpio,
},
{
"gpio_num": scsi_req_gpio,
"attached_to": scsi_d7_gpio,
"dir_ctrl": piscsi_tad_gpio,
},
{
"gpio_num": scsi_msg_gpio,
"attached_to": scsi_d6_gpio,
"dir_ctrl": piscsi_tad_gpio,
},
{
"gpio_num": scsi_cd_gpio,
"attached_to": scsi_d4_gpio,
"dir_ctrl": piscsi_tad_gpio,
},
{
"gpio_num": scsi_io_gpio,
"attached_to": scsi_d5_gpio,
"dir_ctrl": piscsi_tad_gpio,
},
{
"gpio_num": scsi_bsy_gpio,
"attached_to": scsi_dp_gpio,
"dir_ctrl": piscsi_tad_gpio,
},
{
"gpio_num": scsi_sel_gpio,
"attached_to": scsi_d1_gpio,
"dir_ctrl": piscsi_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(piscsi_dtd_gpio, gpio.LOW)
# Set transceivers IC1 and IC2 to INPUT
def set_dtd_in():
gpio.output(piscsi_dtd_gpio, gpio.HIGH)
# Set transceiver IC4 to OUTPUT
def set_ind_out():
gpio.output(piscsi_ind_gpio, gpio.HIGH)
# Set transceiver IC4 to INPUT
def set_ind_in():
gpio.output(piscsi_ind_gpio, gpio.LOW)
# Set transceiver IC3 to OUTPUT
def set_tad_out():
gpio.output(piscsi_tad_gpio, gpio.HIGH)
# Set transceiver IC3 to INPUT
def set_tad_in():
gpio.output(piscsi_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 == piscsi_tad_gpio:
set_tad_out()
else:
set_tad_in()
if out_gpio == piscsi_dtd_gpio:
set_dtd_out()
else:
set_dtd_in()
if out_gpio == piscsi_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(piscsi_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(piscsi_ind_gpio, gpio.OUT)
gpio.setup(piscsi_tad_gpio, gpio.OUT)
gpio.setup(piscsi_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()
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