# 2.4 QEMU Simulation - Blinky

In the [previous section](https://longer-vision-robot.gitbook.io/stm32f767zi-full-stack/chapter-2.-programming-for-stm32/2.3-first-stm32-project-hello-world), we have **NOT** run/test/debug the program yet. How to do that? Normally, there are 2 ways to test your code before flashing your code down to a chip.

* **Way 1**: Test in a simulator, which simulates the **STM32** chip
* **Way 2**: Test on a real **STM32** development board

In this section, we are going to talk about how to run/test/debug the program in the popular simulator [**QEMU**](https://www.qemu.org/).

## 2.4.1 QEMU Installation

### Option 1: Official Installation

You can directly download QEMU's **NEWEST** release from its official website <https://www.qemu.org>.

### Option 2: Ubuntu Repository

One command will do:

```
$ sudo apt install qemu
```

### Option 3: Build from Source (Recommended)

This option is adopted in our case. Just strictly follow <https://www.qemu.org/download/#source>:

```
git clone git://git.qemu.org/qemu.git
cd qemu
git submodule init
git submodule update --recursive
mkdir build
cd build
../configure
make -j4
```

### Option 4: GNU MCU Eclipse QEMU (Our Way)

Since in our course, we are using [GNU MCU Eclipse Plugin](https://gnu-mcu-eclipse.github.io/), we also use [its own QEMU simulator](https://gnu-mcu-eclipse.github.io/qemu/install/), from where we should be able to find its [releases on Github](https://github.com/gnu-mcu-eclipse/qemu/releases). However, its **NEWEST** release is **v2.8.0-20170301**, which is quite **OLD**. According to [GNU MCU Eclipse QEMU](https://gnu-mcu-eclipse.github.io/qemu/), its current supported boards and MCUs:

**Supported Boards**:

* **Maple** - LeafLab Arduino-style STM32 microcontroller board
* **NUCLEO-F103RB** - ST Nucleo Development Board for STM32 F1 series
* **NetduinoGo** - Netduino GoBus Development Board with STM32F4
* **NetduinoPlus2** - Netduino Development Board with STM32F4
* **STM32-E407** - Olimex Development Board for STM32F407ZGT6
* **STM32-H103** - Olimex Header Board for STM32F103RBT6
* **STM32-P103** - Olimex Prototype Board for STM32F103RBT6
* **STM32-P107** - Olimex Prototype Board for STM32F107VCT6
* **STM32F4-Discovery** - ST Discovery kit for STM32F407/417 lines
* **STM32F429I-Discovery** - ST Discovery kit for STM32F429/439 lines

**Supported MCUs**:

* **STM32F103RB**
* **STM32F107VC**
* **STM32F405RG**
* **STM32F407VG**
* **STM32F407ZG**
* **STM32F429ZI**
* **STM32L152RE**

## 2.4.2 Test QEMU

### Step 1: Create and Build Project

As mentioned above, since current [GNU MCU Eclipse QEMU](https://gnu-mcu-eclipse.github.io/qemu/) does **NOT** support **STM32F767ZI** yet, we have to carry our QEMU test with another board. Here, we pick up board [STM32F429I-Discovery](http://www.st.com/en/evaluation-tools/32f429idiscovery.html) with MCU [STM32F429ZI](http://www.st.com/en/microcontrollers/stm32f429zi.html) to carry out QEMU test.

Similar to [previous section](https://longer-vision-robot.gitbook.io/stm32f767zi-full-stack/chapter-2.-programming-for-stm32/2.3-first-stm32-project-hello-world), let's first create a **Blinky** C/C++ project with board configuration **STM32F4xx** with Chip family **STM32F429xx**, as follows:

![QEMU C++ Project](https://2173079646-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LBY-O3HDo-2Fw4hRMUa%2F-LCztbhKrfuFvfqA3SZY%2F-LCztckXbQbu4ME1bF0V%2FQEMU_C%2B%2B_Project.jpg?generation=1526859211329507\&alt=media)

![QEMU Target Processor Settings](https://2173079646-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LBY-O3HDo-2Fw4hRMUa%2F-LCztbhKrfuFvfqA3SZY%2F-LCztck_FzyC1GrrIzNi%2FQEMU_Target_Processor_Settings.jpg?generation=1526859210688880\&alt=media)

Then, we **Build Project** with any [ARM Embedded GCC Toolchain](https://longer-vision-robot.gitbook.io/stm32f767zi-full-stack/chapter-1.-getting-started-with-stm32/1.6-stm32-online-resource). In our case, we build our code with **Debug** configuration with [GNU MCU Eclipse ARM Embedded GCC Toolchain](https://github.com/gnu-mcu-eclipse/arm-none-eabi-gcc/releases).

```
12:38:20 **** Build of configuration Debug for project F429ZI_Blinky ****
make all 
Building file: ../system/src/stm32f4-hal/stm32f4xx_hal.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -Wno-bad-function-cast -Wno-conversion -Wno-sign-conversion -Wno-unused-parameter -Wno-sign-compare -Wno-missing-prototypes -Wno-missing-declarations -MMD -MP -MF"system/src/stm32f4-hal/stm32f4xx_hal.d" -MT"system/src/stm32f4-hal/stm32f4xx_hal.o" -c -o "system/src/stm32f4-hal/stm32f4xx_hal.o" "../system/src/stm32f4-hal/stm32f4xx_hal.c"
Finished building: ../system/src/stm32f4-hal/stm32f4xx_hal.c

Building file: ../system/src/stm32f4-hal/stm32f4xx_hal_cortex.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -Wno-bad-function-cast -Wno-conversion -Wno-sign-conversion -Wno-unused-parameter -Wno-sign-compare -Wno-missing-prototypes -Wno-missing-declarations -MMD -MP -MF"system/src/stm32f4-hal/stm32f4xx_hal_cortex.d" -MT"system/src/stm32f4-hal/stm32f4xx_hal_cortex.o" -c -o "system/src/stm32f4-hal/stm32f4xx_hal_cortex.o" "../system/src/stm32f4-hal/stm32f4xx_hal_cortex.c"
Finished building: ../system/src/stm32f4-hal/stm32f4xx_hal_cortex.c

Building file: ../system/src/stm32f4-hal/stm32f4xx_hal_dfsdm.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -Wno-bad-function-cast -Wno-conversion -Wno-sign-conversion -Wno-unused-parameter -Wno-sign-compare -Wno-missing-prototypes -Wno-missing-declarations -MMD -MP -MF"system/src/stm32f4-hal/stm32f4xx_hal_dfsdm.d" -MT"system/src/stm32f4-hal/stm32f4xx_hal_dfsdm.o" -c -o "system/src/stm32f4-hal/stm32f4xx_hal_dfsdm.o" "../system/src/stm32f4-hal/stm32f4xx_hal_dfsdm.c"
Finished building: ../system/src/stm32f4-hal/stm32f4xx_hal_dfsdm.c

Building file: ../system/src/stm32f4-hal/stm32f4xx_hal_flash.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -Wno-bad-function-cast -Wno-conversion -Wno-sign-conversion -Wno-unused-parameter -Wno-sign-compare -Wno-missing-prototypes -Wno-missing-declarations -MMD -MP -MF"system/src/stm32f4-hal/stm32f4xx_hal_flash.d" -MT"system/src/stm32f4-hal/stm32f4xx_hal_flash.o" -c -o "system/src/stm32f4-hal/stm32f4xx_hal_flash.o" "../system/src/stm32f4-hal/stm32f4xx_hal_flash.c"
Finished building: ../system/src/stm32f4-hal/stm32f4xx_hal_flash.c

Building file: ../system/src/stm32f4-hal/stm32f4xx_hal_gpio.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -Wno-bad-function-cast -Wno-conversion -Wno-sign-conversion -Wno-unused-parameter -Wno-sign-compare -Wno-missing-prototypes -Wno-missing-declarations -MMD -MP -MF"system/src/stm32f4-hal/stm32f4xx_hal_gpio.d" -MT"system/src/stm32f4-hal/stm32f4xx_hal_gpio.o" -c -o "system/src/stm32f4-hal/stm32f4xx_hal_gpio.o" "../system/src/stm32f4-hal/stm32f4xx_hal_gpio.c"
Finished building: ../system/src/stm32f4-hal/stm32f4xx_hal_gpio.c

Building file: ../system/src/stm32f4-hal/stm32f4xx_hal_iwdg.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -Wno-bad-function-cast -Wno-conversion -Wno-sign-conversion -Wno-unused-parameter -Wno-sign-compare -Wno-missing-prototypes -Wno-missing-declarations -MMD -MP -MF"system/src/stm32f4-hal/stm32f4xx_hal_iwdg.d" -MT"system/src/stm32f4-hal/stm32f4xx_hal_iwdg.o" -c -o "system/src/stm32f4-hal/stm32f4xx_hal_iwdg.o" "../system/src/stm32f4-hal/stm32f4xx_hal_iwdg.c"
Finished building: ../system/src/stm32f4-hal/stm32f4xx_hal_iwdg.c

Building file: ../system/src/stm32f4-hal/stm32f4xx_hal_pwr.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -Wno-bad-function-cast -Wno-conversion -Wno-sign-conversion -Wno-unused-parameter -Wno-sign-compare -Wno-missing-prototypes -Wno-missing-declarations -MMD -MP -MF"system/src/stm32f4-hal/stm32f4xx_hal_pwr.d" -MT"system/src/stm32f4-hal/stm32f4xx_hal_pwr.o" -c -o "system/src/stm32f4-hal/stm32f4xx_hal_pwr.o" "../system/src/stm32f4-hal/stm32f4xx_hal_pwr.c"
Finished building: ../system/src/stm32f4-hal/stm32f4xx_hal_pwr.c

Building file: ../system/src/stm32f4-hal/stm32f4xx_hal_rcc.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -Wno-bad-function-cast -Wno-conversion -Wno-sign-conversion -Wno-unused-parameter -Wno-sign-compare -Wno-missing-prototypes -Wno-missing-declarations -MMD -MP -MF"system/src/stm32f4-hal/stm32f4xx_hal_rcc.d" -MT"system/src/stm32f4-hal/stm32f4xx_hal_rcc.o" -c -o "system/src/stm32f4-hal/stm32f4xx_hal_rcc.o" "../system/src/stm32f4-hal/stm32f4xx_hal_rcc.c"
Finished building: ../system/src/stm32f4-hal/stm32f4xx_hal_rcc.c

Building file: ../system/src/newlib/_cxx.cpp
Invoking: GNU ARM Cross C++ Compiler
arm-none-eabi-g++ -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu++11 -fabi-version=0 -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics -MMD -MP -MF"system/src/newlib/_cxx.d" -MT"system/src/newlib/_cxx.o" -c -o "system/src/newlib/_cxx.o" "../system/src/newlib/_cxx.cpp"
Finished building: ../system/src/newlib/_cxx.cpp

Building file: ../system/src/newlib/_exit.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/newlib/_exit.d" -MT"system/src/newlib/_exit.o" -c -o "system/src/newlib/_exit.o" "../system/src/newlib/_exit.c"
Finished building: ../system/src/newlib/_exit.c

Building file: ../system/src/newlib/_sbrk.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/newlib/_sbrk.d" -MT"system/src/newlib/_sbrk.o" -c -o "system/src/newlib/_sbrk.o" "../system/src/newlib/_sbrk.c"
Finished building: ../system/src/newlib/_sbrk.c

Building file: ../system/src/newlib/_startup.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -DOS_INCLUDE_STARTUP_INIT_MULTIPLE_RAM_SECTIONS -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/newlib/_startup.d" -MT"system/src/newlib/_startup.d" -c -o "system/src/newlib/_startup.o" "../system/src/newlib/_startup.c"
Finished building: ../system/src/newlib/_startup.c

Building file: ../system/src/newlib/_syscalls.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/newlib/_syscalls.d" -MT"system/src/newlib/_syscalls.o" -c -o "system/src/newlib/_syscalls.o" "../system/src/newlib/_syscalls.c"
Finished building: ../system/src/newlib/_syscalls.c

Building file: ../system/src/newlib/assert.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/newlib/assert.d" -MT"system/src/newlib/assert.o" -c -o "system/src/newlib/assert.o" "../system/src/newlib/assert.c"
Finished building: ../system/src/newlib/assert.c

Building file: ../system/src/diag/Trace.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/diag/Trace.d" -MT"system/src/diag/Trace.o" -c -o "system/src/diag/Trace.o" "../system/src/diag/Trace.c"
Finished building: ../system/src/diag/Trace.c

Building file: ../system/src/diag/trace_impl.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/diag/trace_impl.d" -MT"system/src/diag/trace_impl.o" -c -o "system/src/diag/trace_impl.o" "../system/src/diag/trace_impl.c"
Finished building: ../system/src/diag/trace_impl.c

Building file: ../system/src/cortexm/_initialize_hardware.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/cortexm/_initialize_hardware.d" -MT"system/src/cortexm/_initialize_hardware.o" -c -o "system/src/cortexm/_initialize_hardware.o" "../system/src/cortexm/_initialize_hardware.c"
Finished building: ../system/src/cortexm/_initialize_hardware.c

Building file: ../system/src/cortexm/_reset_hardware.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/cortexm/_reset_hardware.d" -MT"system/src/cortexm/_reset_hardware.o" -c -o "system/src/cortexm/_reset_hardware.o" "../system/src/cortexm/_reset_hardware.c"
Finished building: ../system/src/cortexm/_reset_hardware.c

Building file: ../system/src/cortexm/exception_handlers.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/cortexm/exception_handlers.d" -MT"system/src/cortexm/exception_handlers.o" -c -o "system/src/cortexm/exception_handlers.o" "../system/src/cortexm/exception_handlers.c"
Finished building: ../system/src/cortexm/exception_handlers.c

Building file: ../system/src/cmsis/system_stm32f4xx.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/cmsis/system_stm32f4xx.d" -MT"system/src/cmsis/system_stm32f4xx.o" -c -o "system/src/cmsis/system_stm32f4xx.o" "../system/src/cmsis/system_stm32f4xx.c"
Finished building: ../system/src/cmsis/system_stm32f4xx.c

Building file: ../system/src/cmsis/vectors_stm32f429xx.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"system/src/cmsis/vectors_stm32f429xx.d" -MT"system/src/cmsis/vectors_stm32f429xx.o" -c -o "system/src/cmsis/vectors_stm32f429xx.o" "../system/src/cmsis/vectors_stm32f429xx.c"
Finished building: ../system/src/cmsis/vectors_stm32f429xx.c

Building file: ../src/BlinkLed.cpp
Invoking: GNU ARM Cross C++ Compiler
arm-none-eabi-g++ -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu++11 -fabi-version=0 -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics -MMD -MP -MF"src/BlinkLed.d" -MT"src/BlinkLed.o" -c -o "src/BlinkLed.o" "../src/BlinkLed.cpp"
Finished building: ../src/BlinkLed.cpp

Building file: ../src/Timer.cpp
Invoking: GNU ARM Cross C++ Compiler
arm-none-eabi-g++ -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu++11 -fabi-version=0 -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics -MMD -MP -MF"src/Timer.d" -MT"src/Timer.o" -c -o "src/Timer.o" "../src/Timer.cpp"
Finished building: ../src/Timer.cpp

Building file: ../src/_initialize_hardware.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"src/_initialize_hardware.d" -MT"src/_initialize_hardware.o" -c -o "src/_initialize_hardware.o" "../src/_initialize_hardware.c"
../src/_initialize_hardware.c: In function 'SystemClock_Config':
../src/_initialize_hardware.c:126:2: warning: #warning "Please check if the SystemClock_Config() settings match your board!" [-Wcpp]
 #warning "Please check if the SystemClock_Config() settings match your board!"
  ^~~~~~~
Finished building: ../src/_initialize_hardware.c

Building file: ../src/_write.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -MMD -MP -MF"src/_write.d" -MT"src/_write.o" -c -o "src/_write.o" "../src/_write.c"
Finished building: ../src/_write.c

Building file: ../src/main.cpp
Invoking: GNU ARM Cross C++ Compiler
arm-none-eabi-g++ -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu++11 -fabi-version=0 -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics -MMD -MP -MF"src/main.d" -MT"src/main.o" -c -o "src/main.o" "../src/main.cpp"
../src/main.cpp:121:2: warning: #warning "Assume a STM32F429I-Discovery board, PG13-PG14, active high." [-Wcpp]
 #warning "Assume a STM32F429I-Discovery board, PG13-PG14, active high."
  ^~~~~~~
Finished building: ../src/main.cpp

Building file: ../src/stm32f4xx_hal_msp.c
Invoking: GNU ARM Cross C Compiler
arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -DDEBUG -DUSE_FULL_ASSERT -DOS_USE_SEMIHOSTING -DTRACE -DOS_USE_TRACE_SEMIHOSTING_DEBUG -DSTM32F429xx -DUSE_HAL_DRIVER -DHSE_VALUE=8000000 -I"../include" -I"../system/include" -I"../system/include/cmsis" -I"../system/include/stm32f4-hal" -std=gnu11 -Wno-missing-prototypes -Wno-missing-declarations -MMD -MP -MF"src/stm32f4xx_hal_msp.d" -MT"src/stm32f4xx_hal_msp.d" -c -o "src/stm32f4xx_hal_msp.o" "../src/stm32f4xx_hal_msp.c"
Finished building: ../src/stm32f4xx_hal_msp.c

Building target: F429ZI_Blinky.elf
Invoking: GNU ARM Cross C++ Linker
arm-none-eabi-g++ -mcpu=cortex-m4 -mthumb -mfloat-abi=soft -Og -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-move-loop-invariants -Wall -Wextra  -g3 -T mem.ld -T libs.ld -T sections.ld -nostartfiles -Xlinker --gc-sections -L"../ldscripts" -Wl,-Map,"F429ZI_Blinky.map" --specs=nano.specs -o "F429ZI_Blinky.elf"  ./system/src/stm32f4-hal/stm32f4xx_hal.o ./system/src/stm32f4-hal/stm32f4xx_hal_cortex.o ./system/src/stm32f4-hal/stm32f4xx_hal_dfsdm.o ./system/src/stm32f4-hal/stm32f4xx_hal_flash.o ./system/src/stm32f4-hal/stm32f4xx_hal_gpio.o ./system/src/stm32f4-hal/stm32f4xx_hal_iwdg.o ./system/src/stm32f4-hal/stm32f4xx_hal_pwr.o ./system/src/stm32f4-hal/stm32f4xx_hal_rcc.o  ./system/src/newlib/_cxx.o ./system/src/newlib/_exit.o ./system/src/newlib/_sbrk.o ./system/src/newlib/_startup.o ./system/src/newlib/_syscalls.o ./system/src/newlib/assert.o  ./system/src/diag/Trace.o ./system/src/diag/trace_impl.o  ./system/src/cortexm/_initialize_hardware.o ./system/src/cortexm/_reset_hardware.o ./system/src/cortexm/exception_handlers.o  ./system/src/cmsis/system_stm32f4xx.o ./system/src/cmsis/vectors_stm32f429xx.o  ./src/BlinkLed.o ./src/Timer.o ./src/_initialize_hardware.o ./src/_write.o ./src/main.o ./src/stm32f4xx_hal_msp.o   
Finished building target: F429ZI_Blinky.elf

Invoking: GNU ARM Cross Create Flash Image
arm-none-eabi-objcopy -O ihex "F429ZI_Blinky.elf"  "F429ZI_Blinky.hex"
Finished building: F429ZI_Blinky.hex

Invoking: GNU ARM Cross Print Size
arm-none-eabi-size --format=berkeley "F429ZI_Blinky.elf"
   text       data        bss        dec        hex    filename
  13278        520        740      14538       38ca    F429ZI_Blinky.elf
Finished building: F429ZI_Blinky.siz


12:38:24 Build Finished (took 3s.574ms)
```

As you can see, a file named **F429ZI\_Blinky.elf** is produced under folder **Debug** or **Release**, depending on what kind of target/configuration you specified to build.

### Step 2: Run Project with QEMU

Finally, we need to run the project by emulating **STM32F429I-Discovery** with chip **STM32F429ZI** via **QEMU**. Right click on the built file **HelloWorld.elf** -> **Run As** -> **Run Configurations** -> **GDB QEMU Debugging** -> **New**. We creat a new configuration named **F429ZI\_Blinky QEMU**, and make the **Run Configurations** as in the following two images:

![Run Configurations QEMU - Main Tab](https://2173079646-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LBY-O3HDo-2Fw4hRMUa%2F-LCztbhKrfuFvfqA3SZY%2F-LCztcltNxE4mZLzMFqw%2FRun_Configurations_QEMU_Main.jpg?generation=1526859208684008\&alt=media)

![Run Configurations QEMU - Debugger Tab](https://2173079646-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LBY-O3HDo-2Fw4hRMUa%2F-LD0Wx85oTtfYwbd9xUA%2F-LCztclv1fB3J04GA0Ra%2FRun_Configurations_QEMU_Debugger.jpg?generation=1526886555667113\&alt=media)

And the project **Blinky** successfully run with the following output:

```
GNU ARM Eclipse 64-bits QEMU v2.8.0 (qemu-system-gnuarmeclipse).
Board: 'STM32F429I-Discovery' (ST Discovery kit for STM32F429/439 lines).
Device: 'STM32F429ZI' (Cortex-M4 r0p0, MPU, 4 NVIC prio bits, 91 IRQs), Flash: 2048 kB, RAM: 192 kB.
Command line: 'F429ZI_Blinky' (13 bytes).
Cortex-M4 r0p0 core initialised.
GDB Server listening on: 'tcp::1234'...
Cortex-M4 r0p0 core reset.

... connection accepted from 127.0.0.1.

Execute 'mon system_reset'.
Cortex-M4 r0p0 core reset.

PRIGROUP unimplemented
main(argc=1, argv=["F429ZI_Blinky"]);
Hello ARM World!
Standard output message.
Standard error message.
System clock: 168000000 Hz
[led:green on]
[led:red on]
[led:green off]
[led:red off]
Second 1
[led:green on]
[led:green off]
[led:red on]
Second 2
[led:red off]
Second 3
[led:green on]
Second 4
[led:green off]
[led:red on]
Second 5
[led:green on]
[led:green off]
Second 6
[led:red off]
Second 7
[led:green on]
[led:red on]

QEMU semihosting exit(0)
```

And [GNU MCU Eclipse QEMU](https://gnu-mcu-eclipse.github.io/qemu/) emulates **STM32F429I-Discovery** board on the screen as follows:

![Running Blinky](https://2173079646-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LBY-O3HDo-2Fw4hRMUa%2F-LCztbhKrfuFvfqA3SZY%2F-LCztcm0R6TYg1TceLDQ%2FRunning_Blinky.jpg?generation=1526859213872517\&alt=media)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://longer-vision-robot.gitbook.io/stm32f767zi-full-stack/chapter-2.-programming-for-stm32/2.4-qemu-simulation-blinky.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.