121 lines
No EOL
3.7 KiB
Python
121 lines
No EOL
3.7 KiB
Python
# The MIT License (MIT)
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#
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# Copyright (c) 2018 Shawn Hymel for Adafruit Industries
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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"""
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`uart_test`
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====================================================
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UART Test Module
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* Author(s): Shawn Hymel
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* Date: December 8, 2018
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Implementation Notes
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--------------------
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Performs random writes and reads across UART.
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You will need to connect a loopback wire from TX to RX on your board.
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Run this script as its own main.py to individually run the test, or compile
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with mpy-cross and call from separate test script.
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"""
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import board
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import busio
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import random
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# Constants
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TX_PIN_NAME = 'TX'
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RX_PIN_NAME = 'RX'
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BAUD_RATE = 9600
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NUM_UART_BYTES = 40 # Number of bytes to transmit over UART
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ASCII_MIN = 0x21 # '!' Lowest ASCII char in random range (inclusive)
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ASCII_MAX = 0x7E # '~' Highest ASCII char in random range (inclusive)
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# Test result strings
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PASS = "PASS"
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FAIL = "FAIL"
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NA = "N/A"
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def run_test(pins, tx_pin=TX_PIN_NAME, rx_pin=RX_PIN_NAME, baud_rate=BAUD_RATE):
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# Echo some values over the UART
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if list(set(pins).intersection(set([tx_pin, rx_pin]))):
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# Tell user to create loopback connection
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print("Connect a wire from TX to RX. Press enter to continue.")
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input()
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# Initialize UART
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uart = busio.UART(getattr(board, tx_pin),
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getattr(board, rx_pin),
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baudrate=baud_rate)
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uart.reset_input_buffer()
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# Generate test string
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test_str = ""
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for i in range(NUM_UART_BYTES):
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test_str += chr(random.randint(ASCII_MIN, ASCII_MAX))
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# Transmit test string
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uart.write(test_str)
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print("Transmitting:\t" + test_str)
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# Wait for received string
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data = uart.read(len(test_str))
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recv_str = ''
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if data is not None:
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recv_str = ''.join([chr(b) for b in data])
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print("Received:\t" + recv_str)
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# Release UART pins
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uart.deinit()
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# Compare strings
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if recv_str == test_str:
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return PASS, [tx_pin, rx_pin]
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else:
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return FAIL, [tx_pin, rx_pin]
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else:
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print("No UART pins found")
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return NA, []
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def _main():
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# List out all the pins available to us
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pins = [p for p in dir(board)]
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print()
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print("All pins found:", end=' ')
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# Print pins
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for p in pins:
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print(p, end=' ')
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print('\n')
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# Run test
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result = run_test(pins)
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print()
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print(result[0])
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print("Pins tested: " + str(result[1]))
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# Execute only if run as main.py or code.py
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if __name__ == "__main__":
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_main() |