Semihosting is a mechanism that enables code running on the target device to communicate and use the Input/Output of the host computer.
Firstly, to enable semihosting, you need to remove stubs (-lnosys and
-specs=nosys.specs flags) from a development platform,
and use the semihosted version of the syscalls (adding
--specs=rdimon.specs and -lrdimon to the compiler).
Secondly, you need to override the test_testing_command and configure a tool that will redirect test results to the I/O.
In this example, we run a simple test_dummy test on the
ST Nucleo L152RE board from the
ST STM32 development platform.
The configuration is done in enable_semihosting.py extra script using
Advanced Scripting. The example uses Unity
testing framework and the Custom unity_config.h.
We use the pio test command to run the tests.
> pio test
Verbose mode can be enabled via `-v, --verbose` option
Collected 1 tests
Processing test_dummy in nucleo_l1521re environment
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Building...
Uploading...
Testing...
Info : clock speed 300 kHz
Info : STLINK V2J29M18 (API v2) VID:PID 0483:374B
Info : Target voltage: 3.272727
Info : stm32l1.cpu: Cortex-M3 r2p0 processor detected
Info : stm32l1.cpu: target has 6 breakpoints, 4 watchpoints
Info : starting gdb server for stm32l1.cpu on 3333
Info : Listening on port 3333 for gdb connections
semihosting is enabled
Info : Unable to match requested speed 300 kHz, using 240 kHz
Info : Unable to match requested speed 300 kHz, using 240 kHz
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
test/test_dummy/test_main.c:19: test_dummy [PASSED]
-------------------- nucleo_l1521re:test_dummy [PASSED] Took 5.43 seconds --------------------
===================================== SUMMARY =====================================
Environment Test Status Duration
-------------- ---------- -------- ------------
nucleo_l1521re test_dummy PASSED 00:00:05.433
==================== 1 test cases: 1 succeeded in 00:00:05.433 ====================