STM32 PIL (Processor in the loop) Example

For other sub examples, please visit:

1. Generic - Toggle LED

2. External Mode - LED, PWM, ADC

Environment

• Matlab R2017 x64 for Windows
• STM32MatTarget_4.4.2_setup.exe https://github.com/freshhope/STM32_PIL_Example_Simulink/releases/download/v0.1/STM32MatTarget_4.4.2_setup.exe
• Keil uVision5
• STM32CubeMX
• Any STM32 hardware board

Configuration of Matlab

1. Install all the required packages
2. Set matlab path, add with sub folders of STM32MatTarget installation folder
3. Click "Save" button, from now on STM32MatTarget is fully functional
4. Set current path of Matlab, such as "\Filter\work"
5. Open Test_PIL_IIR_Filter.slx from repository

Configuration of top model

• solver
• data import
• data import is used for test data inject, when the slx is loaded into memory, Matlab workspace automatically loads the input file: testdata.txt
• the testdata.txt is automatically loaded by callback of top model
• hardware implementation, stm32.tlc is used
• code generation page
• code interface page
• STM32 options
• STM32 project files
• Check the configuration of upper reference model, which is run in PIL mode
• Check the configuration of lower reference model, which is run in normal mode, note, the two reference model point to the same file "IIR_Filter_int32.slx", the only difference is "Simulation Mode" of each block parameters
• finally, the test block is ready to run

Code Generation for PIL

1. Click the run button on the top model, the compilation begins
2. NMake error may appear complaining file 'IIR_Filter_int32.mk' not found
3. A quick fix to the error maybe, first find this make file location, and add this path to Matlab invoke VS path:

setenv('VSCMD_START_DIR','slprj\sim\IIR_Filter_int32')

4. Click the run button on the top model, this time compilation will complete without errors
5. The next step is to select COM port, such as COM3, 115200, n, 8, 1
6. Selection of MCU, such as STM32F407VETx running at 168MHz
7. Selection of UART port of MCU, in the current configuration, USART1 is used
8. Until now the code generation is complete for MCU

Prepare hardware for PIL

1. Selection of toolchain, in this example Keil V5 is used
2. Until now, Simulink is waiting for firmware ready
3. Meanwhile, STM32CubeMX is invoked with configuration already done by Simulink, if ST-Link V2 is used, the "SYS.Debug" property should be properly assigned to "Serial Wire", otherwise the MCU cannot be programmed in the future
4. in clock configuration, set HCLK to 168 MHz for STM32F407VETx, note: different clock speed is assigned here for different MCU type
5. in STM32CubeMX project settings, set default firmware location to a specified path, or just download as prompted
6. Generate code, and then open the generated project in Keil
7. Build the firmware in Keil
8. Configure ST-Link V2
9. Load program, now the firmware is running
10. Click "Continue" button on Simulink, PIL is running
11. Profile results