mraa/tests/mock/i2c_checks_write.py

#!/usr/bin/env python

# Author: Alex Tereschenko <alext.mkrs@gmail.com>
# Copyright (c) 2016 Alex Tereschenko.
#
# SPDX-License-Identifier: MIT

import mraa as m
import unittest as u

from i2c_checks_shared import *

class I2cChecksWrite(u.TestCase):
  def setUp(self):
    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)

  def tearDown(self):
    del self.i2c

  def test_i2c_write_full_reg_range(self):
    self.i2c.address(MRAA_MOCK_I2C_ADDR)
    data_to_write = bytearray([0xEE for i in range(MRAA_MOCK_I2C_DATA_LEN)])
    self.assertEqual(self.i2c.write(data_to_write),
                     m.SUCCESS,
                     "I2C write() of full register range did not return success")
    res = self.i2c.read(MRAA_MOCK_I2C_DATA_LEN)
    self.assertEqual(res,
                     data_to_write,
                     "I2C read() after write() of full register range returned unexpected data")

  def test_i2c_write_part_reg_range(self):
    self.i2c.address(MRAA_MOCK_I2C_ADDR)
    data_to_write = bytearray([0xEE for i in range(MRAA_MOCK_I2C_DATA_LEN - 1)])
    self.assertEqual(self.i2c.write(data_to_write),
                     m.SUCCESS,
                     "I2C write() of partial register range did not return success")
    res = self.i2c.read(MRAA_MOCK_I2C_DATA_LEN - 1)
    self.assertEqual(res,
                     data_to_write,
                     "I2C read() after write() of partial register range returned unexpected data")

  def test_i2c_write_len_bigger_than_max(self):
    self.i2c.address(MRAA_MOCK_I2C_ADDR)
    data_to_write = bytearray([0xEE for i in range(MRAA_MOCK_I2C_DATA_LEN + 1)])
    self.assertEqual(self.i2c.write(data_to_write),
                     m.SUCCESS,
                     "I2C write() with length bigger than max did not return success")
    res = self.i2c.read(MRAA_MOCK_I2C_DATA_LEN)
    self.assertEqual(res,
                     data_to_write[:-1],
                     "I2C read() after write() with length bigger than max returned unexpected data")

  def test_i2c_write_invalid_addr(self):
    self.i2c.address(MRAA_MOCK_I2C_ADDR - 1)
    data_to_write = bytearray([0xEE for i in range(MRAA_MOCK_I2C_DATA_LEN)])
    self.assertEqual(self.i2c.write(data_to_write),
                     m.ERROR_UNSPECIFIED,
                     "I2C write() to invalid address did not return error")

if __name__ == "__main__":
  u.main()