192 lines
8.2 KiB
Python
192 lines
8.2 KiB
Python
# Copyright (c) 2014 Adafruit Industries
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# Author: Tony DiCola
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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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import unittest
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import Adafruit_GPIO as GPIO
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import Adafruit_GPIO.SPI as SPI
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from MockGPIO import MockGPIO
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class TestBitBangSPI(unittest.TestCase):
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def test_pin_modes_set_correctly(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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self.assertDictEqual(gpio.pin_mode, { 1: GPIO.OUT,
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2: GPIO.OUT,
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3: GPIO.IN,
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4: GPIO.OUT })
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def test_ss_set_high_after_initialization(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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self.assertListEqual(gpio.pin_written[4], [1])
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def test_mode_0_write(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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device.write([0x1F])
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# Verify clock
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self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1, 0])
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# Verify MOSI
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self.assertListEqual(gpio.pin_written[2], [0, 0, 0, 1, 1, 1, 1, 1])
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# Verify MISO
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self.assertNotIn(3, gpio.pin_written)
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# Verify SS
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self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
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def test_write_assert_deassert_ss_false(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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device.write([0x1F], assert_ss=False, deassert_ss=False)
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self.assertListEqual(gpio.pin_written[4], [1])
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def test_write_lsbfirst(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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device.set_bit_order(SPI.LSBFIRST)
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device.write([0x1F])
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self.assertListEqual(gpio.pin_written[2], [1, 1, 1, 1, 1, 0, 0, 0])
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def test_invalid_mode_fails(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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self.assertRaises(ValueError, device.set_mode, -1)
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self.assertRaises(ValueError, device.set_mode, 4)
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def test_invalid_bit_order_fails(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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self.assertRaises(ValueError, device.set_bit_order, -1)
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self.assertRaises(ValueError, device.set_bit_order, 2)
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def test_mode_0_read(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1]
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result = device.read(1)
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# Verify clock
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self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1, 0])
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# Verify MOSI
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self.assertNotIn(2, gpio.pin_written)
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# Verify MISO
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self.assertNotIn(3, gpio.pin_written)
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# Verify SS
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self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
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# Verify result
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self.assertEqual(result, bytearray([0x1F]))
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def test_read_assert_deassert_ss_false(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1]
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result = device.read(1, assert_ss=False, deassert_ss=False)
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self.assertListEqual(gpio.pin_written[4], [1])
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def test_read_multiple_bytes(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
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0, 0, 0, 1, 1, 1, 1, 1]
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result = device.read(3)
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# Verify clock
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self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1, 0])
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# Verify MOSI
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self.assertNotIn(2, gpio.pin_written)
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# Verify MISO
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self.assertNotIn(3, gpio.pin_written)
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# Verify SS
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self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
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# Verify result
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self.assertEqual(result, bytearray([0x1F, 0xF8, 0x1F]))
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def test_write_multiple_bytes(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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device.write([0x1F, 0xF8, 0x1F])
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# Verify clock
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self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1, 0])
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# Verify MOSI
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self.assertListEqual(gpio.pin_written[2], [0, 0, 0, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 0, 0, 0,
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0, 0, 0, 1, 1, 1, 1, 1])
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# Verify MISO
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self.assertNotIn(3, gpio.pin_written)
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# Verify SS
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self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
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def test_mode_0_transfer(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1]
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result = device.transfer([0xF8])
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# Verify clock
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self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1, 0])
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# Verify MOSI
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self.assertListEqual(gpio.pin_written[2], [1, 1, 1, 1, 1, 0, 0, 0])
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# Verify MISO
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self.assertNotIn(3, gpio.pin_written)
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# Verify SS
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self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
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# Verify result
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self.assertEqual(result, bytearray([0x1F]))
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def test_transfer_multiple_bytes(self):
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gpio = MockGPIO()
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device = SPI.BitBang(gpio, 1, 2, 3, 4)
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gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
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0, 0, 0, 1, 1, 1, 1, 1]
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result = device.transfer([0xF8, 0x1F, 0xF8])
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# Verify clock
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self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1,
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0, 1, 0, 1, 0, 1, 0, 1, 0])
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# Verify MOSI
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self.assertListEqual(gpio.pin_written[2], [1, 1, 1, 1, 1, 0, 0, 0,
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0, 0, 0, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 0, 0, 0])
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# Verify MISO
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self.assertNotIn(3, gpio.pin_written)
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# Verify SS
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self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
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# Verify result
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self.assertEqual(result, bytearray([0x1F, 0xF8, 0x1F]))
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#TODO: Test mode 1, 2, 3
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#TODO: Test null MOSI, MISO, SS
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