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-rw-r--r--Adafruit_Python_GPIO/tests/test_SPI.py192
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diff --git a/Adafruit_Python_GPIO/tests/test_SPI.py b/Adafruit_Python_GPIO/tests/test_SPI.py
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+# Copyright (c) 2014 Adafruit Industries
+# Author: Tony DiCola
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import unittest
+
+import Adafruit_GPIO as GPIO
+import Adafruit_GPIO.SPI as SPI
+
+from MockGPIO import MockGPIO
+
+
+class TestBitBangSPI(unittest.TestCase):
+ def test_pin_modes_set_correctly(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ self.assertDictEqual(gpio.pin_mode, { 1: GPIO.OUT,
+ 2: GPIO.OUT,
+ 3: GPIO.IN,
+ 4: GPIO.OUT })
+
+ def test_ss_set_high_after_initialization(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ self.assertListEqual(gpio.pin_written[4], [1])
+
+ def test_mode_0_write(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ device.write([0x1F])
+ # Verify clock
+ self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1, 0])
+ # Verify MOSI
+ self.assertListEqual(gpio.pin_written[2], [0, 0, 0, 1, 1, 1, 1, 1])
+ # Verify MISO
+ self.assertNotIn(3, gpio.pin_written)
+ # Verify SS
+ self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+
+ def test_write_assert_deassert_ss_false(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ device.write([0x1F], assert_ss=False, deassert_ss=False)
+ self.assertListEqual(gpio.pin_written[4], [1])
+
+ def test_write_lsbfirst(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ device.set_bit_order(SPI.LSBFIRST)
+ device.write([0x1F])
+ self.assertListEqual(gpio.pin_written[2], [1, 1, 1, 1, 1, 0, 0, 0])
+
+ def test_invalid_mode_fails(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ self.assertRaises(ValueError, device.set_mode, -1)
+ self.assertRaises(ValueError, device.set_mode, 4)
+
+ def test_invalid_bit_order_fails(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ self.assertRaises(ValueError, device.set_bit_order, -1)
+ self.assertRaises(ValueError, device.set_bit_order, 2)
+
+ def test_mode_0_read(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1]
+ result = device.read(1)
+ # Verify clock
+ self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1, 0])
+ # Verify MOSI
+ self.assertNotIn(2, gpio.pin_written)
+ # Verify MISO
+ self.assertNotIn(3, gpio.pin_written)
+ # Verify SS
+ self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+ # Verify result
+ self.assertEqual(result, bytearray([0x1F]))
+
+ def test_read_assert_deassert_ss_false(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1]
+ result = device.read(1, assert_ss=False, deassert_ss=False)
+ self.assertListEqual(gpio.pin_written[4], [1])
+
+ def test_read_multiple_bytes(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
+ 0, 0, 0, 1, 1, 1, 1, 1]
+ result = device.read(3)
+ # Verify clock
+ self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1, 0])
+ # Verify MOSI
+ self.assertNotIn(2, gpio.pin_written)
+ # Verify MISO
+ self.assertNotIn(3, gpio.pin_written)
+ # Verify SS
+ self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+ # Verify result
+ self.assertEqual(result, bytearray([0x1F, 0xF8, 0x1F]))
+
+ def test_write_multiple_bytes(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ device.write([0x1F, 0xF8, 0x1F])
+ # Verify clock
+ self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1, 0])
+ # Verify MOSI
+ self.assertListEqual(gpio.pin_written[2], [0, 0, 0, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 0, 0, 0,
+ 0, 0, 0, 1, 1, 1, 1, 1])
+ # Verify MISO
+ self.assertNotIn(3, gpio.pin_written)
+ # Verify SS
+ self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+
+ def test_mode_0_transfer(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1]
+ result = device.transfer([0xF8])
+ # Verify clock
+ self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1, 0])
+ # Verify MOSI
+ self.assertListEqual(gpio.pin_written[2], [1, 1, 1, 1, 1, 0, 0, 0])
+ # Verify MISO
+ self.assertNotIn(3, gpio.pin_written)
+ # Verify SS
+ self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+ # Verify result
+ self.assertEqual(result, bytearray([0x1F]))
+
+ def test_transfer_multiple_bytes(self):
+ gpio = MockGPIO()
+ device = SPI.BitBang(gpio, 1, 2, 3, 4)
+ gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
+ 0, 0, 0, 1, 1, 1, 1, 1]
+ result = device.transfer([0xF8, 0x1F, 0xF8])
+ # Verify clock
+ self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1,
+ 0, 1, 0, 1, 0, 1, 0, 1, 0])
+ # Verify MOSI
+ self.assertListEqual(gpio.pin_written[2], [1, 1, 1, 1, 1, 0, 0, 0,
+ 0, 0, 0, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 0, 0, 0])
+ # Verify MISO
+ self.assertNotIn(3, gpio.pin_written)
+ # Verify SS
+ self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+ # Verify result
+ self.assertEqual(result, bytearray([0x1F, 0xF8, 0x1F]))
+
+ #TODO: Test mode 1, 2, 3
+
+ #TODO: Test null MOSI, MISO, SS
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-05 10:50:49 +0000