mock: added I2C functionality

Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

docs/mock.md

@@ -12,8 +12,13 @@ Board configuration
 -------------------
 
 This feature is yet in the experimental mode and not all functionality is available.
-Right now we simulate a single generic board with GPIO (without ISR) and
-an ADC with 10 (std)/12 (max) bit resolution, which returns random values on read.
+Right now we simulate a single generic board with:
+* GPIO (without ISR)
+* ADC with 10 (std)/12 (max) bit resolution, which returns random values on read
+* Single I2C bus with one device at address 0x33 and 10 bytes of register space,
+which can be read or written in bytes or words (big-endian). Technically those
+registers are just an array of `uint8_t`, so you can treat them as 10 single-byte
+registers or 5 single-word ones or a mix thereof.
 
 We plan to develop it further and all [contributions](../CONTRIBUTING.md) are more than welcome.
 
@@ -23,6 +28,8 @@ See the table below for pin layout and features
 |-------------|----------|---------------------------------------|
 | 0           | GPIO0    | GPIO pin, no muxing, no ISR           |
 | 1           | ADC0     | AIO pin, returns random value on read |
+| 2           | I2C0SDA  | SDA pin for I2C0 bus                  |
+| 3           | I2C0SCL  | SCL pin for I2C0 bus                  |
 
 Building
 --------

include/mock/mock_board.h

@@ -30,7 +30,7 @@ extern "C" {
 
 #include "mraa_internal.h"
 
-#define MRAA_MOCK_PINCOUNT 2
+#define MRAA_MOCK_PINCOUNT 4
 
 mraa_board_t*
 mraa_mock_board();

include/mock/mock_board_i2c.h

@@ -0,0 +1,81 @@
+/*
+ * Author: Alex Tereschenko <alext.mkrs@gmail.com>
+ * Copyright (c) 2016 Alex Tereschenko.
+ *
+ * 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.
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mraa_internal.h"
+
+// Mock I2C device address
+#define MOCK_I2C_DEV_ADDR 0x33
+// Mock I2C device data registers block length in bytes. Our code assumes it's >= 1.
+#define MOCK_I2C_DEV_DATA_LEN 10
+// Initial value for each byte in the mock I2C device data registers
+#define MOCK_I2C_DEV_DATA_INIT_BYTE 0xAB
+
+mraa_result_t
+mraa_mock_i2c_init_bus_replace(mraa_i2c_context dev);
+
+mraa_result_t
+mraa_mock_i2c_stop_replace(mraa_i2c_context dev);
+
+mraa_result_t
+mraa_mock_i2c_set_frequency_replace(mraa_i2c_context dev, mraa_i2c_mode_t mode);
+
+mraa_result_t
+mraa_mock_i2c_address_replace(mraa_i2c_context dev, uint8_t addr);
+
+int
+mraa_mock_i2c_read_replace(mraa_i2c_context dev, uint8_t* data, int length);
+
+int
+mraa_mock_i2c_read_byte_replace(mraa_i2c_context dev);
+
+int
+mraa_mock_i2c_read_byte_data_replace(mraa_i2c_context dev, uint8_t command);
+
+int
+mraa_mock_i2c_read_bytes_data_replace(mraa_i2c_context dev, uint8_t command, uint8_t* data, int length);
+
+int
+mraa_mock_i2c_read_word_data_replace(mraa_i2c_context dev, uint8_t command);
+
+mraa_result_t
+mraa_mock_i2c_write_replace(mraa_i2c_context dev, const uint8_t* data, int length);
+
+mraa_result_t
+mraa_mock_i2c_write_byte_replace(mraa_i2c_context dev, const uint8_t data);
+
+mraa_result_t
+mraa_mock_i2c_write_byte_data_replace(mraa_i2c_context dev, const uint8_t data, const uint8_t command);
+
+mraa_result_t
+mraa_mock_i2c_write_word_data_replace(mraa_i2c_context dev, const uint16_t data, const uint8_t command);
+
+#ifdef __cplusplus
+}
+#endif

include/mraa_internal_types.h

@@ -89,6 +89,11 @@ struct _i2c {
     unsigned long funcs; /**< /dev/i2c-* device capabilities as per https://www.kernel.org/doc/Documentation/i2c/functionality */
     void *handle; /**< generic handle for non-standard drivers that don't use file descriptors  */
     mraa_adv_func_t* advance_func; /**< override function table */
+#if defined(MOCKPLAT)
+    uint8_t mock_dev_addr; /**< address of the mock I2C device */
+    uint8_t mock_dev_data_len; /**< mock device data register block length in bytes */
+    uint8_t* mock_dev_data; /**< mock device data register block contents */
+#endif
     /*@}*/
 };
 

src/CMakeLists.txt

@@ -89,6 +89,7 @@ set (mraa_LIB_MOCK_SRCS_NOAUTO
   ${PROJECT_SOURCE_DIR}/src/mock/mock_board.c
   ${PROJECT_SOURCE_DIR}/src/mock/mock_board_gpio.c
   ${PROJECT_SOURCE_DIR}/src/mock/mock_board_aio.c
+  ${PROJECT_SOURCE_DIR}/src/mock/mock_board_i2c.c
 )
 
 set (mraa_LIBS ${CMAKE_THREAD_LIBS_INIT})

src/mock/mock_board.c

@@ -29,6 +29,7 @@
 #include "mock/mock_board.h"
 #include "mock/mock_board_gpio.h"
 #include "mock/mock_board_aio.h"
+#include "mock/mock_board_i2c.h"
 
 #define PLATFORM_NAME "MRAA mock platform"
 
@@ -47,7 +48,13 @@ mraa_mock_board()
     b->aio_count = 1;
     b->adc_raw = 12;
     b->adc_supported = 10;
-    b->i2c_bus_count = 0;
+
+    b->i2c_bus_count = 1;
+    b->i2c_bus[0].bus_id = 0;
+    b->i2c_bus[0].sda = 2;
+    b->i2c_bus[0].scl = 3;
+    b->def_i2c_bus = b->i2c_bus[0].bus_id;
+
     b->spi_bus_count = 0;
 
     b->pwm_default_period = 0;
@@ -79,6 +86,19 @@ mraa_mock_board()
     b->adv_func->aio_init_internal_replace = &mraa_mock_aio_init_internal_replace;
     b->adv_func->aio_close_replace = &mraa_mock_aio_close_replace;
     b->adv_func->aio_read_replace = &mraa_mock_aio_read_replace;
+    b->adv_func->i2c_init_bus_replace = &mraa_mock_i2c_init_bus_replace;
+    b->adv_func->i2c_stop_replace = &mraa_mock_i2c_stop_replace;
+    b->adv_func->i2c_set_frequency_replace = &mraa_mock_i2c_set_frequency_replace;
+    b->adv_func->i2c_address_replace = &mraa_mock_i2c_address_replace;
+    b->adv_func->i2c_read_replace = &mraa_mock_i2c_read_replace;
+    b->adv_func->i2c_read_byte_replace = &mraa_mock_i2c_read_byte_replace;
+    b->adv_func->i2c_read_byte_data_replace = &mraa_mock_i2c_read_byte_data_replace;
+    b->adv_func->i2c_read_bytes_data_replace = &mraa_mock_i2c_read_bytes_data_replace;
+    b->adv_func->i2c_read_word_data_replace = &mraa_mock_i2c_read_word_data_replace;
+    b->adv_func->i2c_write_replace = &mraa_mock_i2c_write_replace;
+    b->adv_func->i2c_write_byte_replace = &mraa_mock_i2c_write_byte_replace;
+    b->adv_func->i2c_write_byte_data_replace = &mraa_mock_i2c_write_byte_data_replace;
+    b->adv_func->i2c_write_word_data_replace = &mraa_mock_i2c_write_word_data_replace;
 
     // Pin definitions
     int pos = 0;
@@ -95,6 +115,18 @@ mraa_mock_board()
     b->pins[pos].aio.mux_total = 0;
     pos++;
 
+    strncpy(b->pins[pos].name, "I2C0SDA", 8);
+    b->pins[pos].capabilites = (mraa_pincapabilities_t){ 1, 0, 0, 0, 0, 1, 0, 0 };
+    b->pins[pos].i2c.mux_total = 0;
+    b->pins[pos].i2c.pinmap = 0;
+    pos++;
+
+    strncpy(b->pins[pos].name, "I2C0SCL", 8);
+    b->pins[pos].capabilites = (mraa_pincapabilities_t){ 1, 0, 0, 0, 0, 1, 0, 0 };
+    b->pins[pos].i2c.mux_total = 0;
+    b->pins[pos].i2c.pinmap = 0;
+    pos++;
+
     return b;
 
 error:

src/mock/mock_board_i2c.c

@@ -0,0 +1,246 @@
+/*
+ * Author: Alex Tereschenko <alext.mkrs@gmail.com>
+ * Copyright (c) 2016 Alex Tereschenko.
+ *
+ * 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.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "common.h"
+#include "mock/mock_board.h"
+#include "mock/mock_board_gpio.h"
+#include "mock/mock_board_aio.h"
+#include "mock/mock_board_i2c.h"
+
+mraa_result_t
+mraa_mock_i2c_init_bus_replace(mraa_i2c_context dev)
+{
+    dev->mock_dev_addr = MOCK_I2C_DEV_ADDR;
+    dev->mock_dev_data_len = MOCK_I2C_DEV_DATA_LEN;
+
+    dev->mock_dev_data = (uint8_t*) calloc(dev->mock_dev_data_len, sizeof(uint8_t));
+    if (dev->mock_dev_data == NULL) {
+        syslog(LOG_CRIT, "i2c%i: init: Failed to allocate memory for mock device context", dev->busnum);
+        return MRAA_ERROR_NO_RESOURCES;
+    }
+
+    // Set initial values for mock device "data registers"
+    memset(dev->mock_dev_data, MOCK_I2C_DEV_DATA_INIT_BYTE, dev->mock_dev_data_len);
+
+    return MRAA_SUCCESS;
+}
+
+mraa_result_t
+mraa_mock_i2c_stop_replace(mraa_i2c_context dev)
+{
+    free(dev->mock_dev_data);
+    free(dev);
+    return MRAA_SUCCESS;
+}
+
+
+mraa_result_t
+mraa_mock_i2c_set_frequency_replace(mraa_i2c_context dev, mraa_i2c_mode_t mode)
+{
+    switch (mode) {
+        case MRAA_I2C_STD:
+        case MRAA_I2C_FAST:
+        case MRAA_I2C_HIGH:
+            return MRAA_SUCCESS;
+            break;
+        default:
+            syslog(LOG_ERR, "i2c%i: set_frequency: Invalid I2C frequency selected", dev->busnum);
+            return MRAA_ERROR_INVALID_PARAMETER;
+    }
+}
+
+mraa_result_t
+mraa_mock_i2c_address_replace(mraa_i2c_context dev, uint8_t addr)
+{
+    const uint8_t MAX_I2C_ADDR = 0x7F;
+
+    if (addr > MAX_I2C_ADDR) {
+        syslog(LOG_ERR, "i2c%i: address: Slave address 0x%X is bigger than max supported (0x%X)",
+               dev->busnum, addr, MAX_I2C_ADDR);
+        return MRAA_ERROR_INVALID_PARAMETER;
+    }
+
+    return MRAA_SUCCESS;
+}
+
+int
+mraa_mock_i2c_read_replace(mraa_i2c_context dev, uint8_t* data, int length)
+{
+    if (dev->addr == dev->mock_dev_addr) {
+        // Account for possible mismatch between length and our "register" range
+        int copy_len = (length <= dev->mock_dev_data_len) ? length : dev->mock_dev_data_len;
+        memcpy(data, dev->mock_dev_data, copy_len);
+        return copy_len;
+    } else {
+        // Not our mock device
+        return -1;
+    }
+}
+
+int
+mraa_mock_i2c_read_byte_replace(mraa_i2c_context dev)
+{
+    if (dev->addr == dev->mock_dev_addr) {
+        return dev->mock_dev_data[0];
+    } else {
+        // Not our mock device
+        return -1;
+    }
+}
+
+int
+mraa_mock_i2c_read_byte_data_replace(mraa_i2c_context dev, uint8_t command)
+{
+    if (dev->addr == dev->mock_dev_addr) {
+        if (command < dev->mock_dev_data_len) {
+            return dev->mock_dev_data[command];
+        } else {
+            syslog(LOG_ERR,
+                   "i2c%i: read_byte_data: Command/register number is too big, max is 0x%X",
+                   dev->busnum, dev->mock_dev_data_len - 1);
+            return -1;
+        }
+    } else {
+        // Not our mock device
+        return -1;
+    }
+}
+
+int
+mraa_mock_i2c_read_bytes_data_replace(mraa_i2c_context dev, uint8_t command, uint8_t* data, int length)
+{
+    if (dev->addr == dev->mock_dev_addr) {
+        if (command >= dev->mock_dev_data_len) {
+            syslog(LOG_ERR,
+                   "i2c%i: read_bytes_data: Command/register number is too big, max is 0x%X",
+                   dev->busnum, dev->mock_dev_data_len - 1);
+            return -1;
+        }
+
+        if (length <= 0) {
+            syslog(LOG_ERR,
+                   "i2c%i: read_bytes_data: Length to read is invalid (%d), cannot proceed",
+                   dev->busnum, length);
+            return -1;
+        }
+
+        int i = 0;
+        // We read requested length, but only up to mock device data length
+        for (i = command; (i < (command + length)) && (i < dev->mock_dev_data_len); ++i) {
+            data[i - command] = dev->mock_dev_data[i];
+        }
+        return (i - command);
+    } else {
+        // Not our mock device
+        return -1;
+    }
+}
+
+int
+mraa_mock_i2c_read_word_data_replace(mraa_i2c_context dev, uint8_t command)
+{
+    if (dev->addr == dev->mock_dev_addr) {
+        if ((command + 1) < dev->mock_dev_data_len) {
+            // Let's say the device is big-endian
+            int result = (dev->mock_dev_data[command] << 8) + dev->mock_dev_data[command + 1];
+            return result;
+        } else {
+            syslog(LOG_ERR,
+                   "i2c%i: read_word_data: Command/register number is too big, max is 0x%X",
+                   dev->busnum, dev->mock_dev_data_len - 2);
+            return -1;
+        }
+    } else {
+        // Not our mock device
+        return -1;
+    }
+}
+
+mraa_result_t
+mraa_mock_i2c_write_replace(mraa_i2c_context dev, const uint8_t* data, int length)
+{
+    if (dev->addr == dev->mock_dev_addr) {
+        int copy_len = (length <= dev->mock_dev_data_len) ? length : dev->mock_dev_data_len;
+        memcpy(dev->mock_dev_data, data, copy_len);
+        return MRAA_SUCCESS;
+    } else {
+        // Not our mock device
+        return MRAA_ERROR_UNSPECIFIED;
+    }
+}
+
+mraa_result_t
+mraa_mock_i2c_write_byte_replace(mraa_i2c_context dev, const uint8_t data)
+{
+    if (dev->addr == dev->mock_dev_addr) {
+        dev->mock_dev_data[0] = data;
+        return MRAA_SUCCESS;
+    } else {
+        // Not our mock device
+        return MRAA_ERROR_UNSPECIFIED;
+    }
+}
+
+mraa_result_t
+mraa_mock_i2c_write_byte_data_replace(mraa_i2c_context dev, const uint8_t data, const uint8_t command)
+{
+    if (dev->addr == dev->mock_dev_addr) {
+        if (command < dev->mock_dev_data_len) {
+            dev->mock_dev_data[command] = data;
+            return MRAA_SUCCESS;
+        } else {
+            syslog(LOG_ERR,
+                   "i2c%i: write_byte_data: Command/register number is too big, max is 0x%X",
+                   dev->busnum, dev->mock_dev_data_len - 1);
+            return MRAA_ERROR_UNSPECIFIED;
+        }
+    } else {
+        // Not our mock device
+        return MRAA_ERROR_UNSPECIFIED;
+    }
+}
+
+mraa_result_t
+mraa_mock_i2c_write_word_data_replace(mraa_i2c_context dev, const uint16_t data, const uint8_t command)
+{
+    if (dev->addr == dev->mock_dev_addr) {
+        if ((command + 1) < dev->mock_dev_data_len) {
+            // Let's say the device is big-endian
+            dev->mock_dev_data[command] = (data & 0xFF00) >> 8;
+            dev->mock_dev_data[command + 1] = data & 0x00FF;
+            return MRAA_SUCCESS;
+        } else {
+            syslog(LOG_ERR,
+                   "i2c%i: write_word_data: Command/register number is too big, max is 0x%X",
+                   dev->busnum, dev->mock_dev_data_len - 2);
+            return MRAA_ERROR_UNSPECIFIED;
+        }
+    } else {
+        // Not our mock device
+        return MRAA_ERROR_UNSPECIFIED;
+    }
+}

tests/mock/CMakeLists.txt

@@ -10,6 +10,18 @@ add_test (NAME py_gpio_mode COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT
 
 add_test (NAME py_aio COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/aio_checks.py)
 
+add_test (NAME py_i2c_freq COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/i2c_checks_freq.py)
+add_test (NAME py_i2c_addr COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/i2c_checks_addr.py)
+add_test (NAME py_i2c_read COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/i2c_checks_read.py)
+add_test (NAME py_i2c_write COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/i2c_checks_write.py)
+add_test (NAME py_i2c_read_byte COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/i2c_checks_read_byte.py)
+add_test (NAME py_i2c_write_byte COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/i2c_checks_write_byte.py)
+add_test (NAME py_i2c_read_byte_data COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/i2c_checks_read_byte_data.py)
+add_test (NAME py_i2c_write_byte_data COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/i2c_checks_write_byte_data.py)
+add_test (NAME py_i2c_read_bytes_data COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/i2c_checks_read_bytes_data.py)
+add_test (NAME py_i2c_read_word_data COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/i2c_checks_read_word_data.py)
+add_test (NAME py_i2c_write_word_data COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/i2c_checks_write_word_data.py)
+
 set_tests_properties(py_general
                      py_platform
                      py_gpio_basic
@@ -19,4 +31,15 @@ set_tests_properties(py_general
                      py_gpio_isr
                      py_gpio_mode
                      py_aio
+                     py_i2c_freq
+                     py_i2c_addr
+                     py_i2c_read
+                     py_i2c_write
+                     py_i2c_read_byte
+                     py_i2c_write_byte
+                     py_i2c_read_byte_data
+                     py_i2c_write_byte_data
+                     py_i2c_read_bytes_data
+                     py_i2c_read_word_data
+                     py_i2c_write_word_data
                      PROPERTIES ENVIRONMENT "PYTHONPATH=${PYTHON_DEFAULT_PYTHONPATH}")

tests/mock/i2c_checks_addr.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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 mraa as m
+import unittest as u
+
+from i2c_checks_shared import *
+
+class I2cChecksAddr(u.TestCase):
+  def setUp(self):
+    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)
+
+  def tearDown(self):
+    del self.i2c
+
+  def test_i2c_address(self):
+    self.assertEqual(self.i2c.address(0x10),
+                     m.SUCCESS,
+                     "Setting address to 0x10 did not return success")
+
+  def test_i2c_address_invalid_bigger_than_max(self):
+    # For standard 7-bit addressing 0x7F is max address
+    self.assertEqual(self.i2c.address(0xFF),
+                     m.ERROR_INVALID_PARAMETER,
+                     "Setting address to 0xFF did not return INVALID_PARAMETER")
+
+  def test_i2c_address_invalid_smaller_than_min(self):
+    self.assertRaises(OverflowError, self.i2c.address, -100)
+
+if __name__ == "__main__":
+  u.main()

tests/mock/i2c_checks_freq.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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 mraa as m
+import unittest as u
+
+from i2c_checks_shared import *
+
+class I2cChecksFreq(u.TestCase):
+  def setUp(self):
+    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)
+
+  def tearDown(self):
+    del self.i2c
+
+  def test_i2c_frequency_STD(self):
+    self.assertEqual(self.i2c.frequency(m.I2C_STD),
+                     m.SUCCESS,
+                     "Setting frequency to I2C_STD did not return success")
+
+  def test_i2c_frequency_FAST(self):
+    self.assertEqual(self.i2c.frequency(m.I2C_FAST),
+                     m.SUCCESS,
+                     "Setting frequency to I2C_FAST did not return success")
+
+  def test_i2c_frequency_HIGH(self):
+    self.assertEqual(self.i2c.frequency(m.I2C_HIGH),
+                     m.SUCCESS,
+                     "Setting frequency to I2C_HIGH did not return success")
+
+  def test_i2c_frequency_invalid_bigger_than_max(self):
+    self.assertEqual(self.i2c.frequency(100),
+                     m.ERROR_INVALID_PARAMETER,
+                     "Setting frequency to 100 did not return INVALID_PARAMETER")
+
+  def test_i2c_frequency_invalid_smaller_than_min(self):
+    self.assertEqual(self.i2c.frequency(-100),
+                     m.ERROR_INVALID_PARAMETER,
+                     "Setting frequency to -100 did not return INVALID_PARAMETER")
+
+if __name__ == "__main__":
+  u.main()

tests/mock/i2c_checks_read.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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 mraa as m
+import unittest as u
+
+from i2c_checks_shared import *
+
+class I2cChecksRead(u.TestCase):
+  def setUp(self):
+    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)
+
+  def tearDown(self):
+    del self.i2c
+
+  def test_i2c_read_full_reg_range(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    expected_res = bytearray([MRAA_MOCK_I2C_DATA_INIT_BYTE for i in range(MRAA_MOCK_I2C_DATA_LEN)])
+    res = self.i2c.read(MRAA_MOCK_I2C_DATA_LEN)
+    self.assertEqual(res, expected_res, "I2C read() of full register range returned unexpected data")
+
+  def test_i2c_read_part_reg_range(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    expected_res = bytearray([MRAA_MOCK_I2C_DATA_INIT_BYTE for i in range(MRAA_MOCK_I2C_DATA_LEN - 1)])
+    res = self.i2c.read(MRAA_MOCK_I2C_DATA_LEN - 1)
+    self.assertEqual(res, expected_res, "I2C read() of partial register range returned unexpected data")
+
+  def test_i2c_read_invalid_addr(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR - 1)
+    self.assertRaises(IOError, self.i2c.read, MRAA_MOCK_I2C_DATA_LEN)
+
+  def test_i2c_read_invalid_len_bigger_than_max(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    self.assertRaises(IOError, self.i2c.read, MRAA_MOCK_I2C_DATA_LEN + 1)
+
+if __name__ == "__main__":
+  u.main()

tests/mock/i2c_checks_read_byte.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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 mraa as m
+import unittest as u
+
+from i2c_checks_shared import *
+
+class I2cChecksReadByte(u.TestCase):
+  def setUp(self):
+    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)
+
+  def tearDown(self):
+    del self.i2c
+
+  def test_i2c_read_byte(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    expected_res = MRAA_MOCK_I2C_DATA_INIT_BYTE
+    res = self.i2c.readByte()
+    self.assertEqual(res, expected_res, "I2C readByte() returned unexpected data")
+
+  def test_i2c_read_byte_invalid_addr(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR - 1)
+    self.assertRaises(ValueError, self.i2c.readByte)
+
+if __name__ == "__main__":
+  u.main()

tests/mock/i2c_checks_read_byte_data.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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 mraa as m
+import unittest as u
+
+from i2c_checks_shared import *
+
+class I2cChecksReadByteData(u.TestCase):
+  def setUp(self):
+    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)
+
+  def tearDown(self):
+    del self.i2c
+
+  def test_i2c_read_byte_data(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    expected_res = MRAA_MOCK_I2C_DATA_INIT_BYTE
+    res = self.i2c.readReg(MRAA_MOCK_I2C_DATA_LEN - 1)
+    self.assertEqual(res, expected_res, "I2C readReg() returned unexpected data")
+
+  def test_i2c_read_byte_data_invalid_addr(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR - 1)
+    self.assertRaises(ValueError, self.i2c.readReg, MRAA_MOCK_I2C_DATA_LEN - 1)
+
+  def test_i2c_read_byte_data_invalid_reg(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    self.assertRaises(ValueError, self.i2c.readReg, MRAA_MOCK_I2C_DATA_LEN)
+
+if __name__ == "__main__":
+  u.main()

tests/mock/i2c_checks_read_bytes_data.py

@@ -0,0 +1,81 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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 mraa as m
+import unittest as u
+
+from i2c_checks_shared import *
+
+class I2cChecksReadBytesData(u.TestCase):
+  def setUp(self):
+    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)
+
+  def tearDown(self):
+    del self.i2c
+
+  def test_i2c_read_bytes_data(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    # Generate unique data bytes
+    data_to_write = bytearray([0xEE+i for i in range(MRAA_MOCK_I2C_DATA_LEN)])
+    self.i2c.write(data_to_write)
+    # We expect to read the last two bytes
+    expected_res = bytearray(data_to_write[-2:])
+    test_reg_addr = MRAA_MOCK_I2C_DATA_LEN - 2
+    test_read_len = 2
+    self.assertEqual(self.i2c.readBytesReg(test_reg_addr, test_read_len),
+                     expected_res,
+                     "I2C readBytesReg() returned unexpected data")
+
+  def test_i2c_read_bytes_data_length_bigger_than_max(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    # Generate unique data bytes
+    data_to_write = bytearray([0xEE+i for i in range(MRAA_MOCK_I2C_DATA_LEN)])
+    self.i2c.write(data_to_write)
+    # We expect to read the last two bytes
+    expected_res = bytearray(data_to_write[-2:])
+    test_reg_addr = MRAA_MOCK_I2C_DATA_LEN - 2
+    # Set the read length bigger than our data length
+    test_read_len = MRAA_MOCK_I2C_DATA_LEN + 2
+    self.assertEqual(self.i2c.readBytesReg(test_reg_addr, test_read_len),
+                     expected_res,
+                     "I2C readBytesReg() returned unexpected data")
+
+  def test_i2c_read_bytes_data_zero_length(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    self.assertRaises(IOError, self.i2c.readBytesReg, 0x0, 0)
+
+  def test_i2c_read_bytes_data_negative_length(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    self.assertRaises(ValueError, self.i2c.readBytesReg, 0x0, -1)
+
+  def test_i2c_read_bytes_data_invalid_addr(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR - 1)
+    self.assertRaises(IOError, self.i2c.readBytesReg, 0x0, MRAA_MOCK_I2C_DATA_LEN - 1)
+
+  def test_i2c_read_bytes_data_invalid_reg(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    self.assertRaises(IOError, self.i2c.readBytesReg, MRAA_MOCK_I2C_DATA_LEN, MRAA_MOCK_I2C_DATA_LEN - 1)
+
+if __name__ == "__main__":
+  u.main()

tests/mock/i2c_checks_read_word_data.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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 mraa as m
+import unittest as u
+
+from i2c_checks_shared import *
+
+class I2cChecksReadWordData(u.TestCase):
+  def setUp(self):
+    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)
+
+  def tearDown(self):
+    del self.i2c
+
+  def test_i2c_read_word_data(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    high_byte = 0xAA
+    low_byte = 0xBB
+    expected_res = (high_byte << 8) + low_byte
+    self.i2c.writeReg(MRAA_MOCK_I2C_DATA_LEN - 2, high_byte)
+    self.i2c.writeReg(MRAA_MOCK_I2C_DATA_LEN - 1, low_byte)
+    res = self.i2c.readWordReg(MRAA_MOCK_I2C_DATA_LEN - 2)
+    self.assertEqual(res, expected_res, "I2C readWordReg() returned unexpected data")
+
+  def test_i2c_read_word_data_invalid_addr(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR - 1)
+    self.assertRaises(ValueError, self.i2c.readWordReg, MRAA_MOCK_I2C_DATA_LEN - 2)
+
+  def test_i2c_read_word_data_invalid_reg(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    self.assertRaises(ValueError, self.i2c.readReg, MRAA_MOCK_I2C_DATA_LEN)
+
+if __name__ == "__main__":
+  u.main()

tests/mock/i2c_checks_shared.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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.
+
+MRAA_I2C_BUS_NUM = 0
+# These are defined in mock_board.c
+MRAA_MOCK_I2C_ADDR = 0x33
+MRAA_MOCK_I2C_DATA_LEN = 10
+MRAA_MOCK_I2C_DATA_INIT_BYTE = 0xAB

tests/mock/i2c_checks_write.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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 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()

tests/mock/i2c_checks_write_byte.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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 mraa as m
+import unittest as u
+
+from i2c_checks_shared import *
+
+class I2cChecksWriteByte(u.TestCase):
+  def setUp(self):
+    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)
+
+  def tearDown(self):
+    del self.i2c
+
+  def test_i2c_write_byte(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    test_byte = 0xEE
+    self.assertEqual(self.i2c.writeByte(test_byte),
+                     m.SUCCESS,
+                     "I2C writeByte() did not return success")
+    self.assertEqual(self.i2c.readByte(),
+                     test_byte,
+                     "I2C readByte() after writeByte() returned unexpected data")
+
+  def test_i2c_write_byte_invalid_addr(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR - 1)
+    self.assertEqual(self.i2c.writeByte(0xEE),
+                     m.ERROR_UNSPECIFIED,
+                     "I2C writeByte() to invalid address did not return error")
+
+if __name__ == "__main__":
+  u.main()

tests/mock/i2c_checks_write_byte_data.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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 mraa as m
+import unittest as u
+
+from i2c_checks_shared import *
+
+class I2cChecksWriteByteData(u.TestCase):
+  def setUp(self):
+    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)
+
+  def tearDown(self):
+    del self.i2c
+
+  def test_i2c_write_byte_data(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    test_byte = 0xEE
+    reg = MRAA_MOCK_I2C_DATA_LEN - 1
+    self.assertEqual(self.i2c.writeReg(reg, test_byte),
+                     m.SUCCESS,
+                     "I2C writeReg() did not return success")
+    self.assertEqual(self.i2c.readReg(reg),
+                     test_byte,
+                     "I2C readReg() after writeReg() returned unexpected data")
+
+  def test_i2c_write_byte_data_invalid_addr(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR - 1)
+    test_byte = 0xEE
+    reg = MRAA_MOCK_I2C_DATA_LEN - 1
+    self.assertEqual(self.i2c.writeReg(reg, test_byte),
+                     m.ERROR_UNSPECIFIED,
+                     "I2C writeReg() to invalid address did not return error")
+
+  def test_i2c_write_byte_data_invalid_reg(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    test_byte = 0xEE
+    reg = MRAA_MOCK_I2C_DATA_LEN
+    self.assertEqual(self.i2c.writeReg(reg, test_byte),
+                     m.ERROR_UNSPECIFIED,
+                     "I2C writeReg() with invalid register did not return error")
+
+if __name__ == "__main__":
+  u.main()

tests/mock/i2c_checks_write_word_data.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# 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 mraa as m
+import unittest as u
+
+from i2c_checks_shared import *
+
+class I2cChecksWriteWordData(u.TestCase):
+  def setUp(self):
+    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)
+
+  def tearDown(self):
+    del self.i2c
+
+  def test_i2c_write_word_data(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    high_byte = 0xAA
+    low_byte = 0xBB
+    test_word = (high_byte << 8) + low_byte
+    reg = MRAA_MOCK_I2C_DATA_LEN - 2
+    self.assertEqual(self.i2c.writeWordReg(reg, test_word),
+                     m.SUCCESS,
+                     "I2C writeWordReg() did not return success")
+    self.assertEqual(self.i2c.readReg(reg),
+                     high_byte,
+                     "I2C readReg() of higher byte after writeWordReg() returned unexpected data")
+    self.assertEqual(self.i2c.readReg(reg + 1),
+                     low_byte,
+                     "I2C readReg() of lower byte after writeWordReg() returned unexpected data")
+
+  def test_i2c_write_word_data_invalid_addr(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR - 1)
+    test_word = 0xAABB
+    reg = MRAA_MOCK_I2C_DATA_LEN - 2
+    self.assertEqual(self.i2c.writeWordReg(reg, test_word),
+                     m.ERROR_UNSPECIFIED,
+                     "I2C writeWordReg() to invalid address did not return error")
+
+  def test_i2c_write_word_data_invalid_reg(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    test_word = 0xAABB
+    reg = MRAA_MOCK_I2C_DATA_LEN
+    self.assertEqual(self.i2c.writeWordReg(reg, test_word),
+                     m.ERROR_UNSPECIFIED,
+                     "I2C writeWordReg() with invalid register did not return error")
+
+if __name__ == "__main__":
+  u.main()

tests/mock/platform_checks.py

@@ -27,7 +27,7 @@
 import mraa as m
 import unittest as u
 
-PLATFORM_PINCOUNT = 2
+PLATFORM_PINCOUNT = 4
 PLATFORM_STD_ADC_RES_BITS = 10
 PLATFORM_MAX_ADC_RES_BITS = 12