i2c_tool: add i2c_tool example test

1. add example test for i2c-tools
2. make command line arguments number configurable

examples/peripherals/i2c/i2c_tools/example_test.py

@@ -0,0 +1,42 @@
+from __future__ import print_function
+import os
+import sys
+test_fw_path = os.getenv("TEST_FW_PATH")
+if test_fw_path and test_fw_path not in sys.path:
+    sys.path.insert(0, test_fw_path)
+import TinyFW
+import IDF
+
+EXPECT_TIMEOUT = 20
+
+
+@IDF.idf_example_test(env_tag='Example_I2C_CCS811_SENSOR')
+def test_i2ctools_example(env, extra_data):
+    # Get device under test, flash and start example. "i2ctool" must be defined in EnvConfig
+    dut = env.get_dut('i2ctools', 'examples/peripherals/i2c/i2c_tools')
+    dut.start_app()
+    dut.expect("esp32>", timeout=EXPECT_TIMEOUT)
+    # Get i2c address
+    dut.write("i2cdetect")
+    dut.expect("5b", timeout=EXPECT_TIMEOUT)
+    # Get chip ID
+    dut.write("i2cget -c 0x5b -r 0x20 -l 1")
+    dut.expect("0x81", timeout=EXPECT_TIMEOUT)
+    # Reset sensor
+    dut.write("i2cset -c 0x5b -r 0xFF 0x11 0xE5 0x72 0x8A")
+    dut.expect("OK", timeout=EXPECT_TIMEOUT)
+    # Get status
+    dut.write("i2cget -c 0x5b -r 0x00 -l 1")
+    dut.expect_any("0x10", timeout=EXPECT_TIMEOUT)
+    # Change work mode
+    dut.write("i2cset -c 0x5b -r 0xF4")
+    dut.expect("OK", timeout=EXPECT_TIMEOUT)
+    dut.write("i2cset -c 0x5b -r 0x01 0x10")
+    dut.expect("OK", timeout=EXPECT_TIMEOUT)
+    # Get new status
+    dut.write("i2cget -c 0x5b -r 0x00 -l 1")
+    dut.expect_any("0x98", "0x90", timeout=EXPECT_TIMEOUT)
+
+
+if __name__ == '__main__':
+    test_i2ctools_example()