dm36x: Add full run of automated test suite via UART + expect. All tests pass on DM36x!

ports/arm/platforms/dm36x/Makefile

@@ -4,6 +4,9 @@
 
 # Build all test applications:
 #   make
+#
+# Run all tests communicating via UART
+#   make tests
 
 # Location of build tools and atomthreads sources
 KERNEL_DIR=../../../../kernel
@@ -12,6 +15,15 @@ PORT_DIR=../..
 CC=arm-none-eabi-gcc
 OBJCOPY=arm-none-eabi-objcopy
 
+# Location of TFTP root folder for running tests via U-Boot/TFTP.
+# Note, you may need to run the Makefile as root in order to write
+# to this folder.
+TESTS_TFTPROOT=/var/lib/tftpboot
+
+# TTY device and baudrate for automated tests.
+TESTS_TTYDEV=/dev/ttyUSB0
+TESTS_TTYBAUD=115200
+
 # Enable stack-checking.
 #STACK_CHECK=true
 
@@ -128,3 +140,11 @@ doxygen:
 	doxygen ../../Doxyfile
 	doxygen ./Doxyfile
 
+# Run tests on target with expect and serial output
+phony_test_bins = $(addsuffix .sim, $(TEST_BINS))
+tests: $(phony_test_bins)
+.PHONY: tests $(phony_test_bins)
+$(phony_test_bins):
+	cp $(BUILD_DIR)/$(basename $@) $(TESTS_TFTPROOT)/test.bin
+	@echo Running test $(basename $@)
+	./run_test.exp $(TESTS_TTYDEV) $(TESTS_TTYBAUD)

ports/arm/platforms/dm36x/run_test.exp

@@ -0,0 +1,50 @@
+#!/usr/bin/env expect
+
+# Expect script to check an automated test's results via a serial port
+# and check for successful completion.
+#
+# You are expected to set the target's U-boot up to automatically load
+# the app on your TFTP server called "test.bin". Before this script is
+# started the Makefile should have copied the next test binary to the
+# file "test.bin" in your TFTP root folder. The user must sit and
+# hit the reset button after every test completion in order to make
+# the board load and run the next test.bin file.
+#
+# Arguments: <serial_port_device> <baudrate> <test_bin_file>
+#
+# Returns 0 on successful test run, 1 on failure
+
+# Set the serial port baudrate
+stty [lindex $argv 1] < [lindex $argv 0]
+
+# Start the test
+spawn cat [lindex $argv 0]
+puts "Ready: reset the target!"
+
+# Expect to see the test starting within 60 seconds (give long enough
+# for user to reset the board after running the last test).
+set timeout 60
+
+# Wait for the test to start ("Go")
+expect {
+	"Go\r" {
+		puts "Test started"
+
+		# The test could take up to 3 minutes to complete once started
+		set timeout 180
+
+		# Now expect to see "Pass" or "Fail" within 3 minutes
+		expect {
+			"Pass\r" { puts "Test passed"; exit 0 }
+			"Fail\r" { puts "Test failed"; exit 1 }
+			timeout { puts "Test timed out without completing"; exit 1 }
+		}
+	}
+
+	timeout {
+		# Didn't receive "Go" within 10 seconds
+		puts "Test failed to start ('Go' not seen)"
+		exit 1
+	}
+}
+