[ECU STM32] Assign MCU's pins

[AksonovSergei]

To start the development of a printed circuit board, it is necessary to assign the microcontroller pins and develop a minimal program that will allow testing functionality on the development board. This program will then be used to verify the printed circuit board.

Task sequence:

1. Review the requirements for the printed circuit board to determine the signals that the microcontroller must control.
2. Create a project in STM32Cube IDE and configure all necessary inputs and outputs.
3. Test the functionality of each signal on the development board.
4. Document a table mapping the signals to the microcontroller pins in this task.
5. Create a Pull Request.

[AksonovSergei]

@vetshem69
I have added your .ioc file to the dev branch.
Overall, everything looks good, but you planned to use the SWD interface pins (PA13, PA14) – this is not ideal as it would leave you without the ability for step-by-step debugging of the board. I moved the Buzzer to PD10.

Please create full names for the pins (User Label). For example, as I did for PB5, PB4.
Push your changes to the dev branch.

[AksonovSergei]

Hi @Rhinemann and @nazarbychkar,
How's it going? If you have any questions or need support, please ask in this task.

[Rhinemann]

MCU Pin labels and types

Motor control (4 groups)

• Motor_PWM_(1...4) - timer-generated PWM
• Motor_Fwd_(1...4) - GPIO_Output
• Motor_Rvr_(1...4) - GPIO_Output
• Motor_Gnd_(1...4) - not on the MCU

Encoder outputs (4 groups)

• Encoder_Pow_(1...4) - GPIO_Output or just non-MCU power?
• Encoder_Gnd_(1...4) - not on the MCU
• Encoder_A_(1...4) - GPIO_Input?
• Encoder_B_(1...4) - GPIO_Input?

Blue stasus LEDs

• Blue_LED_(1...4) - GPIO_Output

External status LEDs

• Red_LED - GPIO_Output
• Yellow_LED - GPIO_Output
• Green_LED - GPIO_Output

Serial interface connector (USART?)

• Serial_Connector_TX - USART[123]_TX
• Serial_Connector_RX - USART[123]_RX

Ultrasound sensor inputs (2 groups)

• US_Sensor_Pow_(1...2) - GPIO_Output or just non-MCU power?
• US_Sensor_Gnd_(1...2) - not on the MCU
• US_Sensor_Trig_(1...2) - GPIO_Output?
• US_Sensor_Echo_(1...2) - GPIO_Input?

Serial interface connector for GPS (USART?)

• GPS_Connector_TX - USART[123]_TX
• GPS_Connector_RX - USART[123]_RX

I2C interface connector for external compass

• TBD

[AksonovSergei]

Hi @Rhinemann,
Thank you for your effort. Here are the answers to your questions. Let me know if you have any further questions.

Encoder_Pow_(1...4) - GPIO_Output or just non-MCU power?

It must be connected +3.3V power source and should not be connected to GPIO.

US_Sensor_Pow_(1...2) - GPIO_Output or just non-MCU power

It must be connected +5V power source and should not be connected to GPIO.

Encoder_A_(1...4) - GPIO_Input?
Encoder_B_(1...4) - GPIO_Input?

Its must be GPIO inputs connected to a TIMER that has Encoder Mode.
STM32 MCUs have dedicated hardware support for reading quadrature encoders using Timer Encoder Mode. This mode allows you to read encoders efficiently without polling GPIOs manually.

US_Sensor_Trig_(1...2) - GPIO_Output?

It should be assigned to GPIO in the Output Push-Pull mode.

US_Sensor_Echo_(1...2) - GPIO_Input?

This signal must be connected to a GPIO that supports TIMx in Input Capture Mode.
How It Works

1. MCU sends a 10µs pulse on the Trig pin.
2. Sensor sends back an Echo pulse.
3. MCU uses Timer Input Capture Mode to measure pulse width.
4. Convert time to distance using Speed of Sound formula.

[Rhinemann]

Great, thanks for the answer, that means we have this pin arrangement:

MCU Pin labels and types

Motor control (4 groups)

• Motor_PWM_(1...4) - timer-generated PWM
• Motor_Fwd_(1...4) - GPIO_Output
• Motor_Rvr_(1...4) - GPIO_Output
• Motor_Gnd_(1...4) - not on the MCU

Encoder outputs (4 groups)

• Encoder_Gnd_(1...4) - not on the MCU
• Encoder_A_(1...4) - Timer Encoder Mode GPIO
• Encoder_B_(1...4) - Timer Encoder Mode GPIO

Blue stasus LEDs

• Blue_LED_(1...4) - GPIO_Output

External status LEDs

• Red_LED - GPIO_Output
• Yellow_LED - GPIO_Output
• Green_LED - GPIO_Output

Serial interface connector

• Serial_Connector_TX - USART[123]_TX
• Serial_Connector_RX - USART[123]_RX

Ultrasound sensor inputs (2 groups)

• US_Sensor_Gnd_(1...2) - not on the MCU
• US_Sensor_Trig_(1...2) - Output Push-Pull mode
• US_Sensor_Echo_(1...2) - TIMx in Input Capture Mode

Serial interface connector for GPS

• GPS_Connector_TX - USART[123]_TX
• GPS_Connector_RX - USART[123]_RX

I2C interface connector for external compass

• TBD

Also, I have a question, what about the Ethernet connection, as it isn't specified in the documentation?

[AksonovSergei]

Hi,
We need Ethernet interface if it is possible. I have added requirement.