ci: modify ulp_riscv example to detect unintended wake

examples/system/ulp_riscv/example_test.py

@@ -1,11 +1,14 @@
 from __future__ import unicode_literals
 
 import re
+
+import tiny_test_fw
 import ttfw_idf
+from tiny_test_fw import DUT
 
 
 @ttfw_idf.idf_example_test(env_tag='Example_GENERIC', target=['esp32s2'])
-def test_examples_ulp_riscv(env, extra_data):
+def test_examples_ulp_riscv(env, extra_data):  # type: (tiny_test_fw.Env.Env, None) -> None # pylint: disable=unused-argument
     dut = env.get_dut('ulp_riscv', 'examples/system/ulp_riscv')
     dut.start_app()
 
@@ -16,17 +19,26 @@ def test_examples_ulp_riscv(env, extra_data):
     # Run two times to make sure device sleep
     # and wake up properly
     for i in range(0, 2):
-        # Pulling GPIO0 low using DTR
-        dut.port_inst.setDTR(True)
+        # Set GPIO0 using DTR
+        dut.port_inst.setDTR(i % 2 == 0)
 
         dut.expect('ULP-RISC-V woke up the main CPU!', timeout=5)
 
-        # We pulled GPIO0 low previously
-        dut.expect(re.compile(r'ULP-RISC-V read changes in GPIO_0 current is: Low'), timeout=5)
+        # Check GPIO state
+        state = 'Low' if i % 2 == 0 else 'High'
+        dut.expect(re.compile(r'ULP-RISC-V read changes in GPIO_0 current is: %s' % state), timeout=5)
 
         # Go back to sleep
         dut.expect('Entering in deep sleep', timeout=5)
 
+        try:
+            # We expect a timeout here, otherwise it means that
+            # the main CPU woke up unexpectedly!
+            dut.expect('ULP-RISC-V woke up the main CPU!', timeout=20)
+            raise Exception('Main CPU woke up unexpectedly!')
+        except DUT.ExpectTimeout:
+            pass
+
 
 if __name__ == '__main__':
     test_examples_ulp_riscv()