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