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[sw] Add a CMake option to choose whether to halt the core upon program termination #53

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[sw] Add a CMake option to choose whether to halt the core upon program termination #53

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2 changes: 2 additions & 0 deletions README.md
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Expand Up @@ -401,6 +401,8 @@ make
popd
```

The HALT_SIM_WHEN_EXIT CMake option can be used to automatically stop the simulation when the program exits (`cmake -DHALT_SIM_WHEN_EXIT=ON ../`). This option should be disabled when building software for loading into an FPGA, otherwise the chip will not accept subsequent applications via the `util/load_demo_system.sh` script once the current program exits.

Note the FPGA build relies on a fixed path to the initial binary (blank.vmem) so
if you want to create your build directory elsewhere you need to adjust the path
in `ibex_demo_system.core`
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5 changes: 5 additions & 0 deletions sw/CMakeLists.txt
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Expand Up @@ -3,10 +3,15 @@ project(demo_system_sw)

option(SIM_CTRL_OUTPUT
"Send string output to simulator control rather than UART")
option(HALT_SIM_WHEN_EXIT
"Halt the simulator when the program exits otherwise the core will be kept in a sleep loop")

if(SIM_CTRL_OUTPUT)
add_compile_definitions(SIM_CTRL_OUTPUT)
endif()
if(HALT_SIM_WHEN_EXIT)
add_compile_definitions(HALT_SIM_WHEN_EXIT)
endif()

set(COMMON_DIR "${CMAKE_CURRENT_LIST_DIR}/common")
set(LINKER_SCRIPT "${COMMON_DIR}/link.ld")
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2 changes: 2 additions & 0 deletions sw/common/crt0.S
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Expand Up @@ -67,10 +67,12 @@ main_entry:
addi x11, x0, 0
jal x1, main

#ifdef HALT_SIM_WHEN_EXIT
/* Halt simulation */
li x5, SIM_CTRL_BASE + SIM_CTRL_CTRL
li x6, 1
sw x6, 0(x5)
#endif

/* If execution ends up here just put the core to sleep */
sleep_loop:
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