Experiments with running Ada on STM32 MCU with Qemu
This is a repository of examples of running Ada programs for STM32 MCU using Qemu system emulator.
Hello world via UART on unmodified QemuIn this demo we run Hello world built with Ada arm-eabi cross toolchain from Alire and light-tasking-stm32f4 runtime using unmodified qemu-system-arm.
STM32 RCC support in Qemu is quite rough, so the clock setup routine in Ada runtime hangs waiting for the MCU to signal that the clock generator is ready. We can work around this by editing the startup code in setup_pll.adb. For UART text output we can use the corresponding s-textio__stm32f4.adb from bb-runtimes. We should also replace a-textio.adb with a version using System.Text_IO, since the default one in light-tasking-stm32f4 runtime uses Semihosting (not supported in qemu).
Install apt install qemu-system-arm
Build and run:
cd 01_hello_uart alr build qemu-system-arm -M netduinoplus2 -kernel bin/uart_test.bin -serial stdio -display none # Hello! # Hello!
If you want to attach with a debugger, add the switch -gdb tcp::3333. Also add -S if you want Qemu not to execute code until GDB connects. The -d unimp,guest_errors switch can be useful if you want to see debug messages about unimplemented registers.
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